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, 535 insertions, 0 deletions

diff --git a/drivers/media/platform/renesas/rcar-isp.c b/drivers/media/platform/renesas/rcar-isp.c
new file mode 100644
index 000000000..10b3474f9
--- /dev/null
+++ b/drivers/media/platform/renesas/rcar-isp.c
@@ -0,0 +1,535 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2021 Renesas Electronics Corp.
+ *
+ * Driver for Renesas R-Car ISP Channel Selector
+ *
+ * The ISP hardware is capable of more than just channel selection, features
+ * such as demosaicing, white balance control and color space conversion are
+ * also possible. These more advanced features are not supported by the driver
+ * due to lack of documentation.
+ */
+
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/reset.h>
+
+#include <media/mipi-csi2.h>
+#include <media/v4l2-subdev.h>
+
+#define ISPINPUTSEL0_REG				0x0008
+#define ISPINPUTSEL0_SEL_CSI0				BIT(31)
+
+#define ISPSTART_REG					0x0014
+#define ISPSTART_START					0xffff
+#define ISPSTART_STOP					0x0000
+
+#define ISPPROCMODE_DT_REG(n)				(0x1100 + (0x4 * (n)))
+#define ISPPROCMODE_DT_PROC_MODE_VC3(pm)		(((pm) & 0x3f) << 24)
+#define ISPPROCMODE_DT_PROC_MODE_VC2(pm)		(((pm) & 0x3f) << 16)
+#define ISPPROCMODE_DT_PROC_MODE_VC1(pm)		(((pm) & 0x3f) << 8)
+#define ISPPROCMODE_DT_PROC_MODE_VC0(pm)		((pm) & 0x3f)
+
+#define ISPCS_FILTER_ID_CH_REG(n)			(0x3000 + (0x0100 * (n)))
+
+#define ISPCS_DT_CODE03_CH_REG(n)			(0x3008 + (0x100 * (n)))
+#define ISPCS_DT_CODE03_EN3				BIT(31)
+#define ISPCS_DT_CODE03_DT3(dt)				(((dt) & 0x3f) << 24)
+#define ISPCS_DT_CODE03_EN2				BIT(23)
+#define ISPCS_DT_CODE03_DT2(dt)				(((dt) & 0x3f) << 16)
+#define ISPCS_DT_CODE03_EN1				BIT(15)
+#define ISPCS_DT_CODE03_DT1(dt)				(((dt) & 0x3f) << 8)
+#define ISPCS_DT_CODE03_EN0				BIT(7)
+#define ISPCS_DT_CODE03_DT0(dt)				((dt) & 0x3f)
+
+struct rcar_isp_format {
+	u32 code;
+	unsigned int datatype;
+	unsigned int procmode;
+};
+
+static const struct rcar_isp_format rcar_isp_formats[] = {
+	{
+		.code = MEDIA_BUS_FMT_RGB888_1X24,
+		.datatype = MIPI_CSI2_DT_RGB888,
+		.procmode = 0x15
+	}, {
+		.code = MEDIA_BUS_FMT_Y10_1X10,
+		.datatype = MIPI_CSI2_DT_RAW10,
+		.procmode = 0x10,
+	}, {
+		.code = MEDIA_BUS_FMT_UYVY8_1X16,
+		.datatype = MIPI_CSI2_DT_YUV422_8B,
+		.procmode = 0x0c,
+	}, {
+		.code = MEDIA_BUS_FMT_YUYV8_1X16,
+		.datatype = MIPI_CSI2_DT_YUV422_8B,
+		.procmode = 0x0c,
+	}, {
+		.code = MEDIA_BUS_FMT_UYVY8_2X8,
+		.datatype = MIPI_CSI2_DT_YUV422_8B,
+		.procmode = 0x0c,
+	}, {
+		.code = MEDIA_BUS_FMT_YUYV10_2X10,
+		.datatype = MIPI_CSI2_DT_YUV422_8B,
+		.procmode = 0x0c,
+	},
+};
+
+static const struct rcar_isp_format *risp_code_to_fmt(unsigned int code)
+{
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(rcar_isp_formats); i++) {
+		if (rcar_isp_formats[i].code == code)
+			return &rcar_isp_formats[i];
+	}
+
+	return NULL;
+}
+
+enum rcar_isp_input {
+	RISP_CSI_INPUT0,
+	RISP_CSI_INPUT1,
+};
+
+enum rcar_isp_pads {
+	RCAR_ISP_SINK,
+	RCAR_ISP_PORT0,
+	RCAR_ISP_PORT1,
+	RCAR_ISP_PORT2,
+	RCAR_ISP_PORT3,
+	RCAR_ISP_PORT4,
+	RCAR_ISP_PORT5,
+	RCAR_ISP_PORT6,
+	RCAR_ISP_PORT7,
+	RCAR_ISP_NUM_PADS,
+};
+
+struct rcar_isp {
+	struct device *dev;
+	void __iomem *base;
+	struct reset_control *rstc;
+
+	enum rcar_isp_input csi_input;
+
+	struct v4l2_subdev subdev;
+	struct media_pad pads[RCAR_ISP_NUM_PADS];
+
+	struct v4l2_async_notifier notifier;
+	struct v4l2_subdev *remote;
+
+	struct mutex lock; /* Protects mf and stream_count. */
+	struct v4l2_mbus_framefmt mf;
+	int stream_count;
+};
+
+static inline struct rcar_isp *sd_to_isp(struct v4l2_subdev *sd)
+{
+	return container_of(sd, struct rcar_isp, subdev);
+}
+
+static inline struct rcar_isp *notifier_to_isp(struct v4l2_async_notifier *n)
+{
+	return container_of(n, struct rcar_isp, notifier);
+}
+
+static void risp_write(struct rcar_isp *isp, u32 offset, u32 value)
+{
+	iowrite32(value, isp->base + offset);
+}
+
+static u32 risp_read(struct rcar_isp *isp, u32 offset)
+{
+	return ioread32(isp->base + offset);
+}
+
+static int risp_power_on(struct rcar_isp *isp)
+{
+	int ret;
+
+	ret = pm_runtime_resume_and_get(isp->dev);
+	if (ret < 0)
+		return ret;
+
+	ret = reset_control_deassert(isp->rstc);
+	if (ret < 0) {
+		pm_runtime_put(isp->dev);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void risp_power_off(struct rcar_isp *isp)
+{
+	reset_control_assert(isp->rstc);
+	pm_runtime_put(isp->dev);
+}
+
+static int risp_start(struct rcar_isp *isp)
+{
+	const struct rcar_isp_format *format;
+	unsigned int vc;
+	u32 sel_csi = 0;
+	int ret;
+
+	format = risp_code_to_fmt(isp->mf.code);
+	if (!format) {
+		dev_err(isp->dev, "Unsupported bus format\n");
+		return -EINVAL;
+	}
+
+	ret = risp_power_on(isp);
+	if (ret) {
+		dev_err(isp->dev, "Failed to power on ISP\n");
+		return ret;
+	}
+
+	/* Select CSI-2 input source. */
+	if (isp->csi_input == RISP_CSI_INPUT1)
+		sel_csi = ISPINPUTSEL0_SEL_CSI0;
+
+	risp_write(isp, ISPINPUTSEL0_REG,
+		   risp_read(isp, ISPINPUTSEL0_REG) | sel_csi);
+
+	/* Configure Channel Selector. */
+	for (vc = 0; vc < 4; vc++) {
+		u8 ch = vc + 4;
+		u8 dt = format->datatype;
+
+		risp_write(isp, ISPCS_FILTER_ID_CH_REG(ch), BIT(vc));
+		risp_write(isp, ISPCS_DT_CODE03_CH_REG(ch),
+			   ISPCS_DT_CODE03_EN3 | ISPCS_DT_CODE03_DT3(dt) |
+			   ISPCS_DT_CODE03_EN2 | ISPCS_DT_CODE03_DT2(dt) |
+			   ISPCS_DT_CODE03_EN1 | ISPCS_DT_CODE03_DT1(dt) |
+			   ISPCS_DT_CODE03_EN0 | ISPCS_DT_CODE03_DT0(dt));
+	}
+
+	/* Setup processing method. */
+	risp_write(isp, ISPPROCMODE_DT_REG(format->datatype),
+		   ISPPROCMODE_DT_PROC_MODE_VC3(format->procmode) |
+		   ISPPROCMODE_DT_PROC_MODE_VC2(format->procmode) |
+		   ISPPROCMODE_DT_PROC_MODE_VC1(format->procmode) |
+		   ISPPROCMODE_DT_PROC_MODE_VC0(format->procmode));
+
+	/* Start ISP. */
+	risp_write(isp, ISPSTART_REG, ISPSTART_START);
+
+	ret = v4l2_subdev_call(isp->remote, video, s_stream, 1);
+	if (ret)
+		risp_power_off(isp);
+
+	return ret;
+}
+
+static void risp_stop(struct rcar_isp *isp)
+{
+	v4l2_subdev_call(isp->remote, video, s_stream, 0);
+
+	/* Stop ISP. */
+	risp_write(isp, ISPSTART_REG, ISPSTART_STOP);
+
+	risp_power_off(isp);
+}
+
+static int risp_s_stream(struct v4l2_subdev *sd, int enable)
+{
+	struct rcar_isp *isp = sd_to_isp(sd);
+	int ret = 0;
+
+	mutex_lock(&isp->lock);
+
+	if (!isp->remote) {
+		ret = -ENODEV;
+		goto out;
+	}
+
+	if (enable && isp->stream_count == 0) {
+		ret = risp_start(isp);
+		if (ret)
+			goto out;
+	} else if (!enable && isp->stream_count == 1) {
+		risp_stop(isp);
+	}
+
+	isp->stream_count += enable ? 1 : -1;
+out:
+	mutex_unlock(&isp->lock);
+
+	return ret;
+}
+
+static const struct v4l2_subdev_video_ops risp_video_ops = {
+	.s_stream = risp_s_stream,
+};
+
+static int risp_set_pad_format(struct v4l2_subdev *sd,
+			       struct v4l2_subdev_state *sd_state,
+			       struct v4l2_subdev_format *format)
+{
+	struct rcar_isp *isp = sd_to_isp(sd);
+	struct v4l2_mbus_framefmt *framefmt;
+
+	mutex_lock(&isp->lock);
+
+	if (!risp_code_to_fmt(format->format.code))
+		format->format.code = rcar_isp_formats[0].code;
+
+	if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
+		isp->mf = format->format;
+	} else {
+		framefmt = v4l2_subdev_get_try_format(sd, sd_state, 0);
+		*framefmt = format->format;
+	}
+
+	mutex_unlock(&isp->lock);
+
+	return 0;
+}
+
+static int risp_get_pad_format(struct v4l2_subdev *sd,
+			       struct v4l2_subdev_state *sd_state,
+			       struct v4l2_subdev_format *format)
+{
+	struct rcar_isp *isp = sd_to_isp(sd);
+
+	mutex_lock(&isp->lock);
+
+	if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE)
+		format->format = isp->mf;
+	else
+		format->format = *v4l2_subdev_get_try_format(sd, sd_state, 0);
+
+	mutex_unlock(&isp->lock);
+
+	return 0;
+}
+
+static const struct v4l2_subdev_pad_ops risp_pad_ops = {
+	.set_fmt = risp_set_pad_format,
+	.get_fmt = risp_get_pad_format,
+	.link_validate = v4l2_subdev_link_validate_default,
+};
+
+static const struct v4l2_subdev_ops rcar_isp_subdev_ops = {
+	.video	= &risp_video_ops,
+	.pad	= &risp_pad_ops,
+};
+
+/* -----------------------------------------------------------------------------
+ * Async handling and registration of subdevices and links
+ */
+
+static int risp_notify_bound(struct v4l2_async_notifier *notifier,
+			     struct v4l2_subdev *subdev,
+			     struct v4l2_async_subdev *asd)
+{
+	struct rcar_isp *isp = notifier_to_isp(notifier);
+	int pad;
+
+	pad = media_entity_get_fwnode_pad(&subdev->entity, asd->match.fwnode,
+					  MEDIA_PAD_FL_SOURCE);
+	if (pad < 0) {
+		dev_err(isp->dev, "Failed to find pad for %s\n", subdev->name);
+		return pad;
+	}
+
+	isp->remote = subdev;
+
+	dev_dbg(isp->dev, "Bound %s pad: %d\n", subdev->name, pad);
+
+	return media_create_pad_link(&subdev->entity, pad,
+				     &isp->subdev.entity, 0,
+				     MEDIA_LNK_FL_ENABLED |
+				     MEDIA_LNK_FL_IMMUTABLE);
+}
+
+static void risp_notify_unbind(struct v4l2_async_notifier *notifier,
+			       struct v4l2_subdev *subdev,
+			       struct v4l2_async_subdev *asd)
+{
+	struct rcar_isp *isp = notifier_to_isp(notifier);
+
+	isp->remote = NULL;
+
+	dev_dbg(isp->dev, "Unbind %s\n", subdev->name);
+}
+
+static const struct v4l2_async_notifier_operations risp_notify_ops = {
+	.bound = risp_notify_bound,
+	.unbind = risp_notify_unbind,
+};
+
+static int risp_parse_dt(struct rcar_isp *isp)
+{
+	struct v4l2_async_subdev *asd;
+	struct fwnode_handle *fwnode;
+	struct fwnode_handle *ep;
+	unsigned int id;
+	int ret;
+
+	for (id = 0; id < 2; id++) {
+		ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(isp->dev),
+						     0, id, 0);
+		if (ep)
+			break;
+	}
+
+	if (!ep) {
+		dev_err(isp->dev, "Not connected to subdevice\n");
+		return -EINVAL;
+	}
+
+	if (id == 1)
+		isp->csi_input = RISP_CSI_INPUT1;
+
+	fwnode = fwnode_graph_get_remote_endpoint(ep);
+	fwnode_handle_put(ep);
+
+	dev_dbg(isp->dev, "Found '%pOF'\n", to_of_node(fwnode));
+
+	v4l2_async_nf_init(&isp->notifier);
+	isp->notifier.ops = &risp_notify_ops;
+
+	asd = v4l2_async_nf_add_fwnode(&isp->notifier, fwnode,
+				       struct v4l2_async_subdev);
+	fwnode_handle_put(fwnode);
+	if (IS_ERR(asd))
+		return PTR_ERR(asd);
+
+	ret = v4l2_async_subdev_nf_register(&isp->subdev, &isp->notifier);
+	if (ret)
+		v4l2_async_nf_cleanup(&isp->notifier);
+
+	return ret;
+}
+
+/* -----------------------------------------------------------------------------
+ * Platform Device Driver
+ */
+
+static const struct media_entity_operations risp_entity_ops = {
+	.link_validate = v4l2_subdev_link_validate,
+};
+
+static int risp_probe_resources(struct rcar_isp *isp,
+				struct platform_device *pdev)
+{
+	struct resource *res;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	isp->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(isp->base))
+		return PTR_ERR(isp->base);
+
+	isp->rstc = devm_reset_control_get(&pdev->dev, NULL);
+
+	return PTR_ERR_OR_ZERO(isp->rstc);
+}
+
+static const struct of_device_id risp_of_id_table[] = {
+	{ .compatible = "renesas,r8a779a0-isp" },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, risp_of_id_table);
+
+static int risp_probe(struct platform_device *pdev)
+{
+	struct rcar_isp *isp;
+	unsigned int i;
+	int ret;
+
+	isp = devm_kzalloc(&pdev->dev, sizeof(*isp), GFP_KERNEL);
+	if (!isp)
+		return -ENOMEM;
+
+	isp->dev = &pdev->dev;
+
+	mutex_init(&isp->lock);
+
+	ret = risp_probe_resources(isp, pdev);
+	if (ret) {
+		dev_err(isp->dev, "Failed to get resources\n");
+		goto error_mutex;
+	}
+
+	platform_set_drvdata(pdev, isp);
+
+	pm_runtime_enable(&pdev->dev);
+
+	ret = risp_parse_dt(isp);
+	if (ret)
+		goto error_pm;
+
+	isp->subdev.owner = THIS_MODULE;
+	isp->subdev.dev = &pdev->dev;
+	v4l2_subdev_init(&isp->subdev, &rcar_isp_subdev_ops);
+	v4l2_set_subdevdata(&isp->subdev, &pdev->dev);
+	snprintf(isp->subdev.name, V4L2_SUBDEV_NAME_SIZE, "%s %s",
+		 KBUILD_MODNAME, dev_name(&pdev->dev));
+	isp->subdev.flags = V4L2_SUBDEV_FL_HAS_DEVNODE;
+
+	isp->subdev.entity.function = MEDIA_ENT_F_VID_MUX;
+	isp->subdev.entity.ops = &risp_entity_ops;
+
+	isp->pads[RCAR_ISP_SINK].flags = MEDIA_PAD_FL_SINK;
+	for (i = RCAR_ISP_PORT0; i < RCAR_ISP_NUM_PADS; i++)
+		isp->pads[i].flags = MEDIA_PAD_FL_SOURCE;
+
+	ret = media_entity_pads_init(&isp->subdev.entity, RCAR_ISP_NUM_PADS,
+				     isp->pads);
+	if (ret)
+		goto error_notifier;
+
+	ret = v4l2_async_register_subdev(&isp->subdev);
+	if (ret < 0)
+		goto error_notifier;
+
+	dev_info(isp->dev, "Using CSI-2 input: %u\n", isp->csi_input);
+
+	return 0;
+error_notifier:
+	v4l2_async_nf_unregister(&isp->notifier);
+	v4l2_async_nf_cleanup(&isp->notifier);
+error_pm:
+	pm_runtime_disable(&pdev->dev);
+error_mutex:
+	mutex_destroy(&isp->lock);
+
+	return ret;
+}
+
+static int risp_remove(struct platform_device *pdev)
+{
+	struct rcar_isp *isp = platform_get_drvdata(pdev);
+
+	v4l2_async_nf_unregister(&isp->notifier);
+	v4l2_async_nf_cleanup(&isp->notifier);
+
+	v4l2_async_unregister_subdev(&isp->subdev);
+
+	pm_runtime_disable(&pdev->dev);
+
+	mutex_destroy(&isp->lock);
+
+	return 0;
+}
+
+static struct platform_driver rcar_isp_driver = {
+	.driver = {
+		.name = "rcar-isp",
+		.of_match_table = risp_of_id_table,
+	},
+	.probe = risp_probe,
+	.remove = risp_remove,
+};
+
+module_platform_driver(rcar_isp_driver);
+
+MODULE_AUTHOR("Niklas Söderlund <niklas.soderlund@ragnatech.se>");
+MODULE_DESCRIPTION("Renesas R-Car ISP Channel Selector driver");
+MODULE_LICENSE("GPL");