Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 971 insertions, 0 deletions

diff --git a/drivers/iio/adc/sc27xx_adc.c b/drivers/iio/adc/sc27xx_adc.c
new file mode 100644
index 000000000..ff1fc329b
--- /dev/null
+++ b/drivers/iio/adc/sc27xx_adc.c
@@ -0,0 +1,971 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Spreadtrum Communications Inc.
+
+#include <linux/hwspinlock.h>
+#include <linux/iio/iio.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/nvmem-consumer.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+
+/* PMIC global registers definition */
+#define SC2730_MODULE_EN		0x1808
+#define SC2731_MODULE_EN		0xc08
+#define SC27XX_MODULE_ADC_EN		BIT(5)
+#define SC2721_ARM_CLK_EN		0xc0c
+#define SC2730_ARM_CLK_EN		0x180c
+#define SC2731_ARM_CLK_EN		0xc10
+#define SC27XX_CLK_ADC_EN		BIT(5)
+#define SC27XX_CLK_ADC_CLK_EN		BIT(6)
+
+/* ADC controller registers definition */
+#define SC27XX_ADC_CTL			0x0
+#define SC27XX_ADC_CH_CFG		0x4
+#define SC27XX_ADC_DATA			0x4c
+#define SC27XX_ADC_INT_EN		0x50
+#define SC27XX_ADC_INT_CLR		0x54
+#define SC27XX_ADC_INT_STS		0x58
+#define SC27XX_ADC_INT_RAW		0x5c
+
+/* Bits and mask definition for SC27XX_ADC_CTL register */
+#define SC27XX_ADC_EN			BIT(0)
+#define SC27XX_ADC_CHN_RUN		BIT(1)
+#define SC27XX_ADC_12BIT_MODE		BIT(2)
+#define SC27XX_ADC_RUN_NUM_MASK		GENMASK(7, 4)
+#define SC27XX_ADC_RUN_NUM_SHIFT	4
+
+/* Bits and mask definition for SC27XX_ADC_CH_CFG register */
+#define SC27XX_ADC_CHN_ID_MASK		GENMASK(4, 0)
+#define SC27XX_ADC_SCALE_MASK		GENMASK(10, 9)
+#define SC2721_ADC_SCALE_MASK		BIT(5)
+#define SC27XX_ADC_SCALE_SHIFT		9
+#define SC2721_ADC_SCALE_SHIFT		5
+
+/* Bits definitions for SC27XX_ADC_INT_EN registers */
+#define SC27XX_ADC_IRQ_EN		BIT(0)
+
+/* Bits definitions for SC27XX_ADC_INT_CLR registers */
+#define SC27XX_ADC_IRQ_CLR		BIT(0)
+
+/* Bits definitions for SC27XX_ADC_INT_RAW registers */
+#define SC27XX_ADC_IRQ_RAW		BIT(0)
+
+/* Mask definition for SC27XX_ADC_DATA register */
+#define SC27XX_ADC_DATA_MASK		GENMASK(11, 0)
+
+/* Timeout (ms) for the trylock of hardware spinlocks */
+#define SC27XX_ADC_HWLOCK_TIMEOUT	5000
+
+/* Timeout (us) for ADC data conversion according to ADC datasheet */
+#define SC27XX_ADC_RDY_TIMEOUT		1000000
+#define SC27XX_ADC_POLL_RAW_STATUS	500
+
+/* Maximum ADC channel number */
+#define SC27XX_ADC_CHANNEL_MAX		32
+
+/* ADC voltage ratio definition */
+#define SC27XX_VOLT_RATIO(n, d)		\
+	(((n) << SC27XX_RATIO_NUMERATOR_OFFSET) | (d))
+#define SC27XX_RATIO_NUMERATOR_OFFSET	16
+#define SC27XX_RATIO_DENOMINATOR_MASK	GENMASK(15, 0)
+
+/* ADC specific channel reference voltage 3.5V */
+#define SC27XX_ADC_REFVOL_VDD35		3500000
+
+/* ADC default channel reference voltage is 2.8V */
+#define SC27XX_ADC_REFVOL_VDD28		2800000
+
+struct sc27xx_adc_data {
+	struct device *dev;
+	struct regulator *volref;
+	struct regmap *regmap;
+	/* lock to protect against multiple access to the device */
+	struct mutex lock;
+	/*
+	 * One hardware spinlock to synchronize between the multiple
+	 * subsystems which will access the unique ADC controller.
+	 */
+	struct hwspinlock *hwlock;
+	int channel_scale[SC27XX_ADC_CHANNEL_MAX];
+	u32 base;
+	int irq;
+	const struct sc27xx_adc_variant_data *var_data;
+};
+
+/*
+ * Since different PMICs of SC27xx series can have different
+ * address and ratio, we should save ratio config and base
+ * in the device data structure.
+ */
+struct sc27xx_adc_variant_data {
+	u32 module_en;
+	u32 clk_en;
+	u32 scale_shift;
+	u32 scale_mask;
+	const struct sc27xx_adc_linear_graph *bscale_cal;
+	const struct sc27xx_adc_linear_graph *sscale_cal;
+	void (*init_scale)(struct sc27xx_adc_data *data);
+	int (*get_ratio)(int channel, int scale);
+	bool set_volref;
+};
+
+struct sc27xx_adc_linear_graph {
+	int volt0;
+	int adc0;
+	int volt1;
+	int adc1;
+};
+
+/*
+ * According to the datasheet, we can convert one ADC value to one voltage value
+ * through 2 points in the linear graph. If the voltage is less than 1.2v, we
+ * should use the small-scale graph, and if more than 1.2v, we should use the
+ * big-scale graph.
+ */
+static struct sc27xx_adc_linear_graph big_scale_graph = {
+	4200, 3310,
+	3600, 2832,
+};
+
+static struct sc27xx_adc_linear_graph small_scale_graph = {
+	1000, 3413,
+	100, 341,
+};
+
+static const struct sc27xx_adc_linear_graph sc2731_big_scale_graph_calib = {
+	4200, 850,
+	3600, 728,
+};
+
+static const struct sc27xx_adc_linear_graph sc2731_small_scale_graph_calib = {
+	1000, 838,
+	100, 84,
+};
+
+static const struct sc27xx_adc_linear_graph big_scale_graph_calib = {
+	4200, 856,
+	3600, 733,
+};
+
+static const struct sc27xx_adc_linear_graph small_scale_graph_calib = {
+	1000, 833,
+	100, 80,
+};
+
+static int sc27xx_adc_get_calib_data(u32 calib_data, int calib_adc)
+{
+	return ((calib_data & 0xff) + calib_adc - 128) * 4;
+}
+
+/* get the adc nvmem cell calibration data */
+static int adc_nvmem_cell_calib_data(struct sc27xx_adc_data *data, const char *cell_name)
+{
+	struct nvmem_cell *cell;
+	void *buf;
+	u32 origin_calib_data = 0;
+	size_t len;
+
+	if (!data)
+		return -EINVAL;
+
+	cell = nvmem_cell_get(data->dev, cell_name);
+	if (IS_ERR(cell))
+		return PTR_ERR(cell);
+
+	buf = nvmem_cell_read(cell, &len);
+	if (IS_ERR(buf)) {
+		nvmem_cell_put(cell);
+		return PTR_ERR(buf);
+	}
+
+	memcpy(&origin_calib_data, buf, min(len, sizeof(u32)));
+
+	kfree(buf);
+	nvmem_cell_put(cell);
+	return origin_calib_data;
+}
+
+static int sc27xx_adc_scale_calibration(struct sc27xx_adc_data *data,
+					bool big_scale)
+{
+	const struct sc27xx_adc_linear_graph *calib_graph;
+	struct sc27xx_adc_linear_graph *graph;
+	const char *cell_name;
+	u32 calib_data = 0;
+
+	if (big_scale) {
+		calib_graph = data->var_data->bscale_cal;
+		graph = &big_scale_graph;
+		cell_name = "big_scale_calib";
+	} else {
+		calib_graph = data->var_data->sscale_cal;
+		graph = &small_scale_graph;
+		cell_name = "small_scale_calib";
+	}
+
+	calib_data = adc_nvmem_cell_calib_data(data, cell_name);
+
+	/* Only need to calibrate the adc values in the linear graph. */
+	graph->adc0 = sc27xx_adc_get_calib_data(calib_data, calib_graph->adc0);
+	graph->adc1 = sc27xx_adc_get_calib_data(calib_data >> 8,
+						calib_graph->adc1);
+
+	return 0;
+}
+
+static int sc2720_adc_get_ratio(int channel, int scale)
+{
+	switch (channel) {
+	case 14:
+		switch (scale) {
+		case 0:
+			return SC27XX_VOLT_RATIO(68, 900);
+		case 1:
+			return SC27XX_VOLT_RATIO(68, 1760);
+		case 2:
+			return SC27XX_VOLT_RATIO(68, 2327);
+		case 3:
+			return SC27XX_VOLT_RATIO(68, 3654);
+		default:
+			return SC27XX_VOLT_RATIO(1, 1);
+		}
+	case 16:
+		switch (scale) {
+		case 0:
+			return SC27XX_VOLT_RATIO(48, 100);
+		case 1:
+			return SC27XX_VOLT_RATIO(480, 1955);
+		case 2:
+			return SC27XX_VOLT_RATIO(480, 2586);
+		case 3:
+			return SC27XX_VOLT_RATIO(48, 406);
+		default:
+			return SC27XX_VOLT_RATIO(1, 1);
+		}
+	case 21:
+	case 22:
+	case 23:
+		switch (scale) {
+		case 0:
+			return SC27XX_VOLT_RATIO(3, 8);
+		case 1:
+			return SC27XX_VOLT_RATIO(375, 1955);
+		case 2:
+			return SC27XX_VOLT_RATIO(375, 2586);
+		case 3:
+			return SC27XX_VOLT_RATIO(300, 3248);
+		default:
+			return SC27XX_VOLT_RATIO(1, 1);
+		}
+	default:
+		switch (scale) {
+		case 0:
+			return SC27XX_VOLT_RATIO(1, 1);
+		case 1:
+			return SC27XX_VOLT_RATIO(1000, 1955);
+		case 2:
+			return SC27XX_VOLT_RATIO(1000, 2586);
+		case 3:
+			return SC27XX_VOLT_RATIO(100, 406);
+		default:
+			return SC27XX_VOLT_RATIO(1, 1);
+		}
+	}
+	return SC27XX_VOLT_RATIO(1, 1);
+}
+
+static int sc2721_adc_get_ratio(int channel, int scale)
+{
+	switch (channel) {
+	case 1:
+	case 2:
+	case 3:
+	case 4:
+		return scale ? SC27XX_VOLT_RATIO(400, 1025) :
+			SC27XX_VOLT_RATIO(1, 1);
+	case 5:
+		return SC27XX_VOLT_RATIO(7, 29);
+	case 7:
+	case 9:
+		return scale ? SC27XX_VOLT_RATIO(100, 125) :
+			SC27XX_VOLT_RATIO(1, 1);
+	case 14:
+		return SC27XX_VOLT_RATIO(68, 900);
+	case 16:
+		return SC27XX_VOLT_RATIO(48, 100);
+	case 19:
+		return SC27XX_VOLT_RATIO(1, 3);
+	default:
+		return SC27XX_VOLT_RATIO(1, 1);
+	}
+	return SC27XX_VOLT_RATIO(1, 1);
+}
+
+static int sc2730_adc_get_ratio(int channel, int scale)
+{
+	switch (channel) {
+	case 14:
+		switch (scale) {
+		case 0:
+			return SC27XX_VOLT_RATIO(68, 900);
+		case 1:
+			return SC27XX_VOLT_RATIO(68, 1760);
+		case 2:
+			return SC27XX_VOLT_RATIO(68, 2327);
+		case 3:
+			return SC27XX_VOLT_RATIO(68, 3654);
+		default:
+			return SC27XX_VOLT_RATIO(1, 1);
+		}
+	case 15:
+		switch (scale) {
+		case 0:
+			return SC27XX_VOLT_RATIO(1, 3);
+		case 1:
+			return SC27XX_VOLT_RATIO(1000, 5865);
+		case 2:
+			return SC27XX_VOLT_RATIO(500, 3879);
+		case 3:
+			return SC27XX_VOLT_RATIO(500, 6090);
+		default:
+			return SC27XX_VOLT_RATIO(1, 1);
+		}
+	case 16:
+		switch (scale) {
+		case 0:
+			return SC27XX_VOLT_RATIO(48, 100);
+		case 1:
+			return SC27XX_VOLT_RATIO(480, 1955);
+		case 2:
+			return SC27XX_VOLT_RATIO(480, 2586);
+		case 3:
+			return SC27XX_VOLT_RATIO(48, 406);
+		default:
+			return SC27XX_VOLT_RATIO(1, 1);
+		}
+	case 21:
+	case 22:
+	case 23:
+		switch (scale) {
+		case 0:
+			return SC27XX_VOLT_RATIO(3, 8);
+		case 1:
+			return SC27XX_VOLT_RATIO(375, 1955);
+		case 2:
+			return SC27XX_VOLT_RATIO(375, 2586);
+		case 3:
+			return SC27XX_VOLT_RATIO(300, 3248);
+		default:
+			return SC27XX_VOLT_RATIO(1, 1);
+		}
+	default:
+		switch (scale) {
+		case 0:
+			return SC27XX_VOLT_RATIO(1, 1);
+		case 1:
+			return SC27XX_VOLT_RATIO(1000, 1955);
+		case 2:
+			return SC27XX_VOLT_RATIO(1000, 2586);
+		case 3:
+			return SC27XX_VOLT_RATIO(1000, 4060);
+		default:
+			return SC27XX_VOLT_RATIO(1, 1);
+		}
+	}
+	return SC27XX_VOLT_RATIO(1, 1);
+}
+
+static int sc2731_adc_get_ratio(int channel, int scale)
+{
+	switch (channel) {
+	case 1:
+	case 2:
+	case 3:
+	case 4:
+		return scale ? SC27XX_VOLT_RATIO(400, 1025) :
+			SC27XX_VOLT_RATIO(1, 1);
+	case 5:
+		return SC27XX_VOLT_RATIO(7, 29);
+	case 6:
+		return SC27XX_VOLT_RATIO(375, 9000);
+	case 7:
+	case 8:
+		return scale ? SC27XX_VOLT_RATIO(100, 125) :
+			SC27XX_VOLT_RATIO(1, 1);
+	case 19:
+		return SC27XX_VOLT_RATIO(1, 3);
+	default:
+		return SC27XX_VOLT_RATIO(1, 1);
+	}
+	return SC27XX_VOLT_RATIO(1, 1);
+}
+
+/*
+ * According to the datasheet set specific value on some channel.
+ */
+static void sc2720_adc_scale_init(struct sc27xx_adc_data *data)
+{
+	int i;
+
+	for (i = 0; i < SC27XX_ADC_CHANNEL_MAX; i++) {
+		switch (i) {
+		case 5:
+			data->channel_scale[i] = 3;
+			break;
+		case 7:
+		case 9:
+			data->channel_scale[i] = 2;
+			break;
+		case 13:
+			data->channel_scale[i] = 1;
+			break;
+		case 19:
+		case 30:
+		case 31:
+			data->channel_scale[i] = 3;
+			break;
+		default:
+			data->channel_scale[i] = 0;
+			break;
+		}
+	}
+}
+
+static void sc2730_adc_scale_init(struct sc27xx_adc_data *data)
+{
+	int i;
+
+	for (i = 0; i < SC27XX_ADC_CHANNEL_MAX; i++) {
+		switch (i) {
+		case 5:
+		case 10:
+		case 19:
+		case 30:
+		case 31:
+			data->channel_scale[i] = 3;
+			break;
+		case 7:
+		case 9:
+			data->channel_scale[i] = 2;
+			break;
+		case 13:
+			data->channel_scale[i] = 1;
+			break;
+		default:
+			data->channel_scale[i] = 0;
+			break;
+		}
+	}
+}
+
+static void sc2731_adc_scale_init(struct sc27xx_adc_data *data)
+{
+	int i;
+	/*
+	 * In the current software design, SC2731 support 2 scales,
+	 * channels 5 uses big scale, others use smale.
+	 */
+	for (i = 0; i < SC27XX_ADC_CHANNEL_MAX; i++) {
+		switch (i) {
+		case 5:
+			data->channel_scale[i] = 1;
+			break;
+		default:
+			data->channel_scale[i] = 0;
+			break;
+		}
+	}
+}
+
+static int sc27xx_adc_read(struct sc27xx_adc_data *data, int channel,
+			   int scale, int *val)
+{
+	int ret, ret_volref;
+	u32 tmp, value, status;
+
+	ret = hwspin_lock_timeout_raw(data->hwlock, SC27XX_ADC_HWLOCK_TIMEOUT);
+	if (ret) {
+		dev_err(data->dev, "timeout to get the hwspinlock\n");
+		return ret;
+	}
+
+	/*
+	 * According to the sc2721 chip data sheet, the reference voltage of
+	 * specific channel 30 and channel 31 in ADC module needs to be set from
+	 * the default 2.8v to 3.5v.
+	 */
+	if ((data->var_data->set_volref) && (channel == 30 || channel == 31)) {
+		ret = regulator_set_voltage(data->volref,
+					SC27XX_ADC_REFVOL_VDD35,
+					SC27XX_ADC_REFVOL_VDD35);
+		if (ret) {
+			dev_err(data->dev, "failed to set the volref 3.5v\n");
+			goto unlock_adc;
+		}
+	}
+
+	ret = regmap_update_bits(data->regmap, data->base + SC27XX_ADC_CTL,
+				 SC27XX_ADC_EN, SC27XX_ADC_EN);
+	if (ret)
+		goto regulator_restore;
+
+	ret = regmap_update_bits(data->regmap, data->base + SC27XX_ADC_INT_CLR,
+				 SC27XX_ADC_IRQ_CLR, SC27XX_ADC_IRQ_CLR);
+	if (ret)
+		goto disable_adc;
+
+	/* Configure the channel id and scale */
+	tmp = (scale << data->var_data->scale_shift) & data->var_data->scale_mask;
+	tmp |= channel & SC27XX_ADC_CHN_ID_MASK;
+	ret = regmap_update_bits(data->regmap, data->base + SC27XX_ADC_CH_CFG,
+				 SC27XX_ADC_CHN_ID_MASK |
+				 data->var_data->scale_mask,
+				 tmp);
+	if (ret)
+		goto disable_adc;
+
+	/* Select 12bit conversion mode, and only sample 1 time */
+	tmp = SC27XX_ADC_12BIT_MODE;
+	tmp |= (0 << SC27XX_ADC_RUN_NUM_SHIFT) & SC27XX_ADC_RUN_NUM_MASK;
+	ret = regmap_update_bits(data->regmap, data->base + SC27XX_ADC_CTL,
+				 SC27XX_ADC_RUN_NUM_MASK | SC27XX_ADC_12BIT_MODE,
+				 tmp);
+	if (ret)
+		goto disable_adc;
+
+	ret = regmap_update_bits(data->regmap, data->base + SC27XX_ADC_CTL,
+				 SC27XX_ADC_CHN_RUN, SC27XX_ADC_CHN_RUN);
+	if (ret)
+		goto disable_adc;
+
+	ret = regmap_read_poll_timeout(data->regmap,
+				       data->base + SC27XX_ADC_INT_RAW,
+				       status, (status & SC27XX_ADC_IRQ_RAW),
+				       SC27XX_ADC_POLL_RAW_STATUS,
+				       SC27XX_ADC_RDY_TIMEOUT);
+	if (ret) {
+		dev_err(data->dev, "read adc timeout, status = 0x%x\n", status);
+		goto disable_adc;
+	}
+
+	ret = regmap_read(data->regmap, data->base + SC27XX_ADC_DATA, &value);
+	if (ret)
+		goto disable_adc;
+
+	value &= SC27XX_ADC_DATA_MASK;
+
+disable_adc:
+	regmap_update_bits(data->regmap, data->base + SC27XX_ADC_CTL,
+			   SC27XX_ADC_EN, 0);
+regulator_restore:
+	if ((data->var_data->set_volref) && (channel == 30 || channel == 31)) {
+		ret_volref = regulator_set_voltage(data->volref,
+					    SC27XX_ADC_REFVOL_VDD28,
+					    SC27XX_ADC_REFVOL_VDD28);
+		if (ret_volref) {
+			dev_err(data->dev, "failed to set the volref 2.8v,ret_volref = 0x%x\n",
+					 ret_volref);
+			ret = ret || ret_volref;
+		}
+	}
+unlock_adc:
+	hwspin_unlock_raw(data->hwlock);
+
+	if (!ret)
+		*val = value;
+
+	return ret;
+}
+
+static void sc27xx_adc_volt_ratio(struct sc27xx_adc_data *data, int channel, int scale,
+				  struct u32_fract *fract)
+{
+	u32 ratio;
+
+	ratio = data->var_data->get_ratio(channel, scale);
+	fract->numerator = ratio >> SC27XX_RATIO_NUMERATOR_OFFSET;
+	fract->denominator = ratio & SC27XX_RATIO_DENOMINATOR_MASK;
+}
+
+static int adc_to_volt(struct sc27xx_adc_linear_graph *graph,
+			      int raw_adc)
+{
+	int tmp;
+
+	tmp = (graph->volt0 - graph->volt1) * (raw_adc - graph->adc1);
+	tmp /= (graph->adc0 - graph->adc1);
+	tmp += graph->volt1;
+
+	return tmp;
+}
+
+static int sc27xx_adc_to_volt(struct sc27xx_adc_linear_graph *graph,
+			      int raw_adc)
+{
+	int tmp;
+
+	tmp = adc_to_volt(graph, raw_adc);
+
+	return tmp < 0 ? 0 : tmp;
+}
+
+static int sc27xx_adc_convert_volt(struct sc27xx_adc_data *data, int channel,
+				   int scale, int raw_adc)
+{
+	struct u32_fract fract;
+	u32 volt;
+
+	/*
+	 * Convert ADC values to voltage values according to the linear graph,
+	 * and channel 5 and channel 1 has been calibrated, so we can just
+	 * return the voltage values calculated by the linear graph. But other
+	 * channels need be calculated to the real voltage values with the
+	 * voltage ratio.
+	 */
+	switch (channel) {
+	case 5:
+		return sc27xx_adc_to_volt(&big_scale_graph, raw_adc);
+
+	case 1:
+		return sc27xx_adc_to_volt(&small_scale_graph, raw_adc);
+
+	default:
+		volt = sc27xx_adc_to_volt(&small_scale_graph, raw_adc);
+		break;
+	}
+
+	sc27xx_adc_volt_ratio(data, channel, scale, &fract);
+
+	return DIV_ROUND_CLOSEST(volt * fract.denominator, fract.numerator);
+}
+
+static int sc27xx_adc_read_processed(struct sc27xx_adc_data *data,
+				     int channel, int scale, int *val)
+{
+	int ret, raw_adc;
+
+	ret = sc27xx_adc_read(data, channel, scale, &raw_adc);
+	if (ret)
+		return ret;
+
+	*val = sc27xx_adc_convert_volt(data, channel, scale, raw_adc);
+	return 0;
+}
+
+static int sc27xx_adc_read_raw(struct iio_dev *indio_dev,
+			       struct iio_chan_spec const *chan,
+			       int *val, int *val2, long mask)
+{
+	struct sc27xx_adc_data *data = iio_priv(indio_dev);
+	int scale = data->channel_scale[chan->channel];
+	int ret, tmp;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		mutex_lock(&data->lock);
+		ret = sc27xx_adc_read(data, chan->channel, scale, &tmp);
+		mutex_unlock(&data->lock);
+
+		if (ret)
+			return ret;
+
+		*val = tmp;
+		return IIO_VAL_INT;
+
+	case IIO_CHAN_INFO_PROCESSED:
+		mutex_lock(&data->lock);
+		ret = sc27xx_adc_read_processed(data, chan->channel, scale,
+						&tmp);
+		mutex_unlock(&data->lock);
+
+		if (ret)
+			return ret;
+
+		*val = tmp;
+		return IIO_VAL_INT;
+
+	case IIO_CHAN_INFO_SCALE:
+		*val = scale;
+		return IIO_VAL_INT;
+
+	default:
+		return -EINVAL;
+	}
+}
+
+static int sc27xx_adc_write_raw(struct iio_dev *indio_dev,
+				struct iio_chan_spec const *chan,
+				int val, int val2, long mask)
+{
+	struct sc27xx_adc_data *data = iio_priv(indio_dev);
+
+	switch (mask) {
+	case IIO_CHAN_INFO_SCALE:
+		data->channel_scale[chan->channel] = val;
+		return IIO_VAL_INT;
+
+	default:
+		return -EINVAL;
+	}
+}
+
+static const struct iio_info sc27xx_info = {
+	.read_raw = &sc27xx_adc_read_raw,
+	.write_raw = &sc27xx_adc_write_raw,
+};
+
+#define SC27XX_ADC_CHANNEL(index, mask) {			\
+	.type = IIO_VOLTAGE,					\
+	.channel = index,					\
+	.info_mask_separate = mask | BIT(IIO_CHAN_INFO_SCALE),	\
+	.datasheet_name = "CH##index",				\
+	.indexed = 1,						\
+}
+
+static const struct iio_chan_spec sc27xx_channels[] = {
+	SC27XX_ADC_CHANNEL(0, BIT(IIO_CHAN_INFO_PROCESSED)),
+	SC27XX_ADC_CHANNEL(1, BIT(IIO_CHAN_INFO_PROCESSED)),
+	SC27XX_ADC_CHANNEL(2, BIT(IIO_CHAN_INFO_PROCESSED)),
+	SC27XX_ADC_CHANNEL(3, BIT(IIO_CHAN_INFO_PROCESSED)),
+	SC27XX_ADC_CHANNEL(4, BIT(IIO_CHAN_INFO_PROCESSED)),
+	SC27XX_ADC_CHANNEL(5, BIT(IIO_CHAN_INFO_PROCESSED)),
+	SC27XX_ADC_CHANNEL(6, BIT(IIO_CHAN_INFO_PROCESSED)),
+	SC27XX_ADC_CHANNEL(7, BIT(IIO_CHAN_INFO_PROCESSED)),
+	SC27XX_ADC_CHANNEL(8, BIT(IIO_CHAN_INFO_PROCESSED)),
+	SC27XX_ADC_CHANNEL(9, BIT(IIO_CHAN_INFO_PROCESSED)),
+	SC27XX_ADC_CHANNEL(10, BIT(IIO_CHAN_INFO_PROCESSED)),
+	SC27XX_ADC_CHANNEL(11, BIT(IIO_CHAN_INFO_PROCESSED)),
+	SC27XX_ADC_CHANNEL(12, BIT(IIO_CHAN_INFO_PROCESSED)),
+	SC27XX_ADC_CHANNEL(13, BIT(IIO_CHAN_INFO_PROCESSED)),
+	SC27XX_ADC_CHANNEL(14, BIT(IIO_CHAN_INFO_PROCESSED)),
+	SC27XX_ADC_CHANNEL(15, BIT(IIO_CHAN_INFO_PROCESSED)),
+	SC27XX_ADC_CHANNEL(16, BIT(IIO_CHAN_INFO_PROCESSED)),
+	SC27XX_ADC_CHANNEL(17, BIT(IIO_CHAN_INFO_PROCESSED)),
+	SC27XX_ADC_CHANNEL(18, BIT(IIO_CHAN_INFO_PROCESSED)),
+	SC27XX_ADC_CHANNEL(19, BIT(IIO_CHAN_INFO_PROCESSED)),
+	SC27XX_ADC_CHANNEL(20, BIT(IIO_CHAN_INFO_RAW)),
+	SC27XX_ADC_CHANNEL(21, BIT(IIO_CHAN_INFO_PROCESSED)),
+	SC27XX_ADC_CHANNEL(22, BIT(IIO_CHAN_INFO_PROCESSED)),
+	SC27XX_ADC_CHANNEL(23, BIT(IIO_CHAN_INFO_PROCESSED)),
+	SC27XX_ADC_CHANNEL(24, BIT(IIO_CHAN_INFO_PROCESSED)),
+	SC27XX_ADC_CHANNEL(25, BIT(IIO_CHAN_INFO_PROCESSED)),
+	SC27XX_ADC_CHANNEL(26, BIT(IIO_CHAN_INFO_PROCESSED)),
+	SC27XX_ADC_CHANNEL(27, BIT(IIO_CHAN_INFO_PROCESSED)),
+	SC27XX_ADC_CHANNEL(28, BIT(IIO_CHAN_INFO_PROCESSED)),
+	SC27XX_ADC_CHANNEL(29, BIT(IIO_CHAN_INFO_PROCESSED)),
+	SC27XX_ADC_CHANNEL(30, BIT(IIO_CHAN_INFO_PROCESSED)),
+	SC27XX_ADC_CHANNEL(31, BIT(IIO_CHAN_INFO_PROCESSED)),
+};
+
+static int sc27xx_adc_enable(struct sc27xx_adc_data *data)
+{
+	int ret;
+
+	ret = regmap_update_bits(data->regmap, data->var_data->module_en,
+				 SC27XX_MODULE_ADC_EN, SC27XX_MODULE_ADC_EN);
+	if (ret)
+		return ret;
+
+	/* Enable ADC work clock and controller clock */
+	ret = regmap_update_bits(data->regmap, data->var_data->clk_en,
+				 SC27XX_CLK_ADC_EN | SC27XX_CLK_ADC_CLK_EN,
+				 SC27XX_CLK_ADC_EN | SC27XX_CLK_ADC_CLK_EN);
+	if (ret)
+		goto disable_adc;
+
+	/* ADC channel scales' calibration from nvmem device */
+	ret = sc27xx_adc_scale_calibration(data, true);
+	if (ret)
+		goto disable_clk;
+
+	ret = sc27xx_adc_scale_calibration(data, false);
+	if (ret)
+		goto disable_clk;
+
+	return 0;
+
+disable_clk:
+	regmap_update_bits(data->regmap, data->var_data->clk_en,
+			   SC27XX_CLK_ADC_EN | SC27XX_CLK_ADC_CLK_EN, 0);
+disable_adc:
+	regmap_update_bits(data->regmap, data->var_data->module_en,
+			   SC27XX_MODULE_ADC_EN, 0);
+
+	return ret;
+}
+
+static void sc27xx_adc_disable(void *_data)
+{
+	struct sc27xx_adc_data *data = _data;
+
+	/* Disable ADC work clock and controller clock */
+	regmap_update_bits(data->regmap, data->var_data->clk_en,
+			   SC27XX_CLK_ADC_EN | SC27XX_CLK_ADC_CLK_EN, 0);
+
+	regmap_update_bits(data->regmap, data->var_data->module_en,
+			   SC27XX_MODULE_ADC_EN, 0);
+}
+
+static const struct sc27xx_adc_variant_data sc2731_data = {
+	.module_en = SC2731_MODULE_EN,
+	.clk_en = SC2731_ARM_CLK_EN,
+	.scale_shift = SC27XX_ADC_SCALE_SHIFT,
+	.scale_mask = SC27XX_ADC_SCALE_MASK,
+	.bscale_cal = &sc2731_big_scale_graph_calib,
+	.sscale_cal = &sc2731_small_scale_graph_calib,
+	.init_scale = sc2731_adc_scale_init,
+	.get_ratio = sc2731_adc_get_ratio,
+	.set_volref = false,
+};
+
+static const struct sc27xx_adc_variant_data sc2730_data = {
+	.module_en = SC2730_MODULE_EN,
+	.clk_en = SC2730_ARM_CLK_EN,
+	.scale_shift = SC27XX_ADC_SCALE_SHIFT,
+	.scale_mask = SC27XX_ADC_SCALE_MASK,
+	.bscale_cal = &big_scale_graph_calib,
+	.sscale_cal = &small_scale_graph_calib,
+	.init_scale = sc2730_adc_scale_init,
+	.get_ratio = sc2730_adc_get_ratio,
+	.set_volref = false,
+};
+
+static const struct sc27xx_adc_variant_data sc2721_data = {
+	.module_en = SC2731_MODULE_EN,
+	.clk_en = SC2721_ARM_CLK_EN,
+	.scale_shift = SC2721_ADC_SCALE_SHIFT,
+	.scale_mask = SC2721_ADC_SCALE_MASK,
+	.bscale_cal = &sc2731_big_scale_graph_calib,
+	.sscale_cal = &sc2731_small_scale_graph_calib,
+	.init_scale = sc2731_adc_scale_init,
+	.get_ratio = sc2721_adc_get_ratio,
+	.set_volref = true,
+};
+
+static const struct sc27xx_adc_variant_data sc2720_data = {
+	.module_en = SC2731_MODULE_EN,
+	.clk_en = SC2721_ARM_CLK_EN,
+	.scale_shift = SC27XX_ADC_SCALE_SHIFT,
+	.scale_mask = SC27XX_ADC_SCALE_MASK,
+	.bscale_cal = &big_scale_graph_calib,
+	.sscale_cal = &small_scale_graph_calib,
+	.init_scale = sc2720_adc_scale_init,
+	.get_ratio = sc2720_adc_get_ratio,
+	.set_volref = false,
+};
+
+static int sc27xx_adc_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct sc27xx_adc_data *sc27xx_data;
+	const struct sc27xx_adc_variant_data *pdata;
+	struct iio_dev *indio_dev;
+	int ret;
+
+	pdata = of_device_get_match_data(dev);
+	if (!pdata) {
+		dev_err(dev, "No matching driver data found\n");
+		return -EINVAL;
+	}
+
+	indio_dev = devm_iio_device_alloc(dev, sizeof(*sc27xx_data));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	sc27xx_data = iio_priv(indio_dev);
+
+	sc27xx_data->regmap = dev_get_regmap(dev->parent, NULL);
+	if (!sc27xx_data->regmap) {
+		dev_err(dev, "failed to get ADC regmap\n");
+		return -ENODEV;
+	}
+
+	ret = of_property_read_u32(np, "reg", &sc27xx_data->base);
+	if (ret) {
+		dev_err(dev, "failed to get ADC base address\n");
+		return ret;
+	}
+
+	sc27xx_data->irq = platform_get_irq(pdev, 0);
+	if (sc27xx_data->irq < 0)
+		return sc27xx_data->irq;
+
+	ret = of_hwspin_lock_get_id(np, 0);
+	if (ret < 0) {
+		dev_err(dev, "failed to get hwspinlock id\n");
+		return ret;
+	}
+
+	sc27xx_data->hwlock = devm_hwspin_lock_request_specific(dev, ret);
+	if (!sc27xx_data->hwlock) {
+		dev_err(dev, "failed to request hwspinlock\n");
+		return -ENXIO;
+	}
+
+	sc27xx_data->dev = dev;
+	if (pdata->set_volref) {
+		sc27xx_data->volref = devm_regulator_get(dev, "vref");
+		if (IS_ERR(sc27xx_data->volref)) {
+			ret = PTR_ERR(sc27xx_data->volref);
+			return dev_err_probe(dev, ret, "failed to get ADC volref\n");
+		}
+	}
+
+	sc27xx_data->var_data = pdata;
+	sc27xx_data->var_data->init_scale(sc27xx_data);
+
+	ret = sc27xx_adc_enable(sc27xx_data);
+	if (ret) {
+		dev_err(dev, "failed to enable ADC module\n");
+		return ret;
+	}
+
+	ret = devm_add_action_or_reset(dev, sc27xx_adc_disable, sc27xx_data);
+	if (ret) {
+		dev_err(dev, "failed to add ADC disable action\n");
+		return ret;
+	}
+
+	indio_dev->name = dev_name(dev);
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->info = &sc27xx_info;
+	indio_dev->channels = sc27xx_channels;
+	indio_dev->num_channels = ARRAY_SIZE(sc27xx_channels);
+
+	mutex_init(&sc27xx_data->lock);
+
+	ret = devm_iio_device_register(dev, indio_dev);
+	if (ret)
+		dev_err(dev, "could not register iio (ADC)");
+
+	return ret;
+}
+
+static const struct of_device_id sc27xx_adc_of_match[] = {
+	{ .compatible = "sprd,sc2731-adc", .data = &sc2731_data},
+	{ .compatible = "sprd,sc2730-adc", .data = &sc2730_data},
+	{ .compatible = "sprd,sc2721-adc", .data = &sc2721_data},
+	{ .compatible = "sprd,sc2720-adc", .data = &sc2720_data},
+	{ }
+};
+MODULE_DEVICE_TABLE(of, sc27xx_adc_of_match);
+
+static struct platform_driver sc27xx_adc_driver = {
+	.probe = sc27xx_adc_probe,
+	.driver = {
+		.name = "sc27xx-adc",
+		.of_match_table = sc27xx_adc_of_match,
+	},
+};
+
+module_platform_driver(sc27xx_adc_driver);
+
+MODULE_AUTHOR("Freeman Liu <freeman.liu@spreadtrum.com>");
+MODULE_DESCRIPTION("Spreadtrum SC27XX ADC Driver");
+MODULE_LICENSE("GPL v2");