From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 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(). ... --- drivers/clk/clk-si570.c | 529 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 529 insertions(+) create mode 100644 drivers/clk/clk-si570.c (limited to 'drivers/clk/clk-si570.c') diff --git a/drivers/clk/clk-si570.c b/drivers/clk/clk-si570.c new file mode 100644 index 000000000..0a6d70c49 --- /dev/null +++ b/drivers/clk/clk-si570.c @@ -0,0 +1,529 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Driver for Silicon Labs Si570/Si571 Programmable XO/VCXO + * + * Copyright (C) 2010, 2011 Ericsson AB. + * Copyright (C) 2011 Guenter Roeck. + * Copyright (C) 2011 - 2021 Xilinx Inc. + * + * Author: Guenter Roeck + * Sören Brinkmann + */ + +#include +#include +#include +#include +#include +#include +#include + +/* Si570 registers */ +#define SI570_REG_HS_N1 7 +#define SI570_REG_N1_RFREQ0 8 +#define SI570_REG_RFREQ1 9 +#define SI570_REG_RFREQ2 10 +#define SI570_REG_RFREQ3 11 +#define SI570_REG_RFREQ4 12 +#define SI570_REG_CONTROL 135 +#define SI570_REG_FREEZE_DCO 137 +#define SI570_DIV_OFFSET_7PPM 6 + +#define HS_DIV_SHIFT 5 +#define HS_DIV_MASK 0xe0 +#define HS_DIV_OFFSET 4 +#define N1_6_2_MASK 0x1f +#define N1_1_0_MASK 0xc0 +#define RFREQ_37_32_MASK 0x3f + +#define SI570_MIN_FREQ 10000000L +#define SI570_MAX_FREQ 1417500000L +#define SI598_MAX_FREQ 525000000L + +#define FDCO_MIN 4850000000LL +#define FDCO_MAX 5670000000LL + +#define SI570_CNTRL_RECALL (1 << 0) +#define SI570_CNTRL_FREEZE_M (1 << 5) +#define SI570_CNTRL_NEWFREQ (1 << 6) + +#define SI570_FREEZE_DCO (1 << 4) + +/** + * struct clk_si570: + * @hw: Clock hw struct + * @regmap: Device's regmap + * @div_offset: Rgister offset for dividers + * @max_freq: Maximum frequency for this device + * @fxtal: Factory xtal frequency + * @n1: Clock divider N1 + * @hs_div: Clock divider HSDIV + * @rfreq: Clock multiplier RFREQ + * @frequency: Current output frequency + * @i2c_client: I2C client pointer + */ +struct clk_si570 { + struct clk_hw hw; + struct regmap *regmap; + unsigned int div_offset; + u64 max_freq; + u64 fxtal; + unsigned int n1; + unsigned int hs_div; + u64 rfreq; + u64 frequency; + struct i2c_client *i2c_client; +}; +#define to_clk_si570(_hw) container_of(_hw, struct clk_si570, hw) + +enum clk_si570_variant { + si57x, + si59x +}; + +/** + * si570_get_divs() - Read clock dividers from HW + * @data: Pointer to struct clk_si570 + * @rfreq: Fractional multiplier (output) + * @n1: Divider N1 (output) + * @hs_div: Divider HSDIV (output) + * Returns 0 on success, negative errno otherwise. + * + * Retrieve clock dividers and multipliers from the HW. + */ +static int si570_get_divs(struct clk_si570 *data, u64 *rfreq, + unsigned int *n1, unsigned int *hs_div) +{ + int err; + u8 reg[6]; + u64 tmp; + + err = regmap_bulk_read(data->regmap, SI570_REG_HS_N1 + data->div_offset, + reg, ARRAY_SIZE(reg)); + if (err) + return err; + + *hs_div = ((reg[0] & HS_DIV_MASK) >> HS_DIV_SHIFT) + HS_DIV_OFFSET; + *n1 = ((reg[0] & N1_6_2_MASK) << 2) + ((reg[1] & N1_1_0_MASK) >> 6) + 1; + /* Handle invalid cases */ + if (*n1 > 1) + *n1 &= ~1; + + tmp = reg[1] & RFREQ_37_32_MASK; + tmp = (tmp << 8) + reg[2]; + tmp = (tmp << 8) + reg[3]; + tmp = (tmp << 8) + reg[4]; + tmp = (tmp << 8) + reg[5]; + *rfreq = tmp; + + return 0; +} + +/** + * si570_get_defaults() - Get default values + * @data: Driver data structure + * @fout: Factory frequency output + * @skip_recall: If true, don't recall NVM into RAM + * Returns 0 on success, negative errno otherwise. + */ +static int si570_get_defaults(struct clk_si570 *data, u64 fout, + bool skip_recall) +{ + int err; + u64 fdco; + + if (!skip_recall) + regmap_write(data->regmap, SI570_REG_CONTROL, + SI570_CNTRL_RECALL); + + err = si570_get_divs(data, &data->rfreq, &data->n1, &data->hs_div); + if (err) + return err; + + /* + * Accept optional precision loss to avoid arithmetic overflows. + * Acceptable per Silicon Labs Application Note AN334. + */ + fdco = fout * data->n1 * data->hs_div; + if (fdco >= (1LL << 36)) + data->fxtal = div64_u64(fdco << 24, data->rfreq >> 4); + else + data->fxtal = div64_u64(fdco << 28, data->rfreq); + + data->frequency = fout; + + return 0; +} + +/** + * si570_update_rfreq() - Update clock multiplier + * @data: Driver data structure + * Passes on regmap_bulk_write() return value. + */ +static int si570_update_rfreq(struct clk_si570 *data) +{ + u8 reg[5]; + + reg[0] = ((data->n1 - 1) << 6) | + ((data->rfreq >> 32) & RFREQ_37_32_MASK); + reg[1] = (data->rfreq >> 24) & 0xff; + reg[2] = (data->rfreq >> 16) & 0xff; + reg[3] = (data->rfreq >> 8) & 0xff; + reg[4] = data->rfreq & 0xff; + + return regmap_bulk_write(data->regmap, SI570_REG_N1_RFREQ0 + + data->div_offset, reg, ARRAY_SIZE(reg)); +} + +/** + * si570_calc_divs() - Caluclate clock dividers + * @frequency: Target frequency + * @data: Driver data structure + * @out_rfreq: RFREG fractional multiplier (output) + * @out_n1: Clock divider N1 (output) + * @out_hs_div: Clock divider HSDIV (output) + * Returns 0 on success, negative errno otherwise. + * + * Calculate the clock dividers (@out_hs_div, @out_n1) and clock multiplier + * (@out_rfreq) for a given target @frequency. + */ +static int si570_calc_divs(unsigned long frequency, struct clk_si570 *data, + u64 *out_rfreq, unsigned int *out_n1, unsigned int *out_hs_div) +{ + int i; + unsigned int n1, hs_div; + u64 fdco, best_fdco = ULLONG_MAX; + static const uint8_t si570_hs_div_values[] = { 11, 9, 7, 6, 5, 4 }; + + for (i = 0; i < ARRAY_SIZE(si570_hs_div_values); i++) { + hs_div = si570_hs_div_values[i]; + /* Calculate lowest possible value for n1 */ + n1 = div_u64(div_u64(FDCO_MIN, hs_div), frequency); + if (!n1 || (n1 & 1)) + n1++; + while (n1 <= 128) { + fdco = (u64)frequency * (u64)hs_div * (u64)n1; + if (fdco > FDCO_MAX) + break; + if (fdco >= FDCO_MIN && fdco < best_fdco) { + *out_n1 = n1; + *out_hs_div = hs_div; + *out_rfreq = div64_u64(fdco << 28, data->fxtal); + best_fdco = fdco; + } + n1 += (n1 == 1 ? 1 : 2); + } + } + + if (best_fdco == ULLONG_MAX) + return -EINVAL; + + return 0; +} + +static unsigned long si570_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + int err; + u64 rfreq, rate; + unsigned int n1, hs_div; + struct clk_si570 *data = to_clk_si570(hw); + + err = si570_get_divs(data, &rfreq, &n1, &hs_div); + if (err) { + dev_err(&data->i2c_client->dev, "unable to recalc rate\n"); + return data->frequency; + } + + rfreq = div_u64(rfreq, hs_div * n1); + rate = (data->fxtal * rfreq) >> 28; + + return rate; +} + +static long si570_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *parent_rate) +{ + int err; + u64 rfreq; + unsigned int n1, hs_div; + struct clk_si570 *data = to_clk_si570(hw); + + if (!rate) + return 0; + + if (div64_u64(abs(rate - data->frequency) * 10000LL, + data->frequency) < 35) { + rfreq = div64_u64((data->rfreq * rate) + + div64_u64(data->frequency, 2), data->frequency); + n1 = data->n1; + hs_div = data->hs_div; + + } else { + err = si570_calc_divs(rate, data, &rfreq, &n1, &hs_div); + if (err) { + dev_err(&data->i2c_client->dev, + "unable to round rate\n"); + return 0; + } + } + + return rate; +} + +/** + * si570_set_frequency() - Adjust output frequency + * @data: Driver data structure + * @frequency: Target frequency + * Returns 0 on success. + * + * Update output frequency for big frequency changes (> 3,500 ppm). + */ +static int si570_set_frequency(struct clk_si570 *data, unsigned long frequency) +{ + int err; + + err = si570_calc_divs(frequency, data, &data->rfreq, &data->n1, + &data->hs_div); + if (err) + return err; + + /* + * The DCO reg should be accessed with a read-modify-write operation + * per AN334 + */ + regmap_write(data->regmap, SI570_REG_FREEZE_DCO, SI570_FREEZE_DCO); + regmap_write(data->regmap, SI570_REG_HS_N1 + data->div_offset, + ((data->hs_div - HS_DIV_OFFSET) << HS_DIV_SHIFT) | + (((data->n1 - 1) >> 2) & N1_6_2_MASK)); + si570_update_rfreq(data); + regmap_write(data->regmap, SI570_REG_FREEZE_DCO, 0); + regmap_write(data->regmap, SI570_REG_CONTROL, SI570_CNTRL_NEWFREQ); + + /* Applying a new frequency can take up to 10ms */ + usleep_range(10000, 12000); + + return 0; +} + +/** + * si570_set_frequency_small() - Adjust output frequency + * @data: Driver data structure + * @frequency: Target frequency + * Returns 0 on success. + * + * Update output frequency for small frequency changes (< 3,500 ppm). + */ +static int si570_set_frequency_small(struct clk_si570 *data, + unsigned long frequency) +{ + /* + * This is a re-implementation of DIV_ROUND_CLOSEST + * using the div64_u64 function lieu of letting the compiler + * insert EABI calls + */ + data->rfreq = div64_u64((data->rfreq * frequency) + + div_u64(data->frequency, 2), data->frequency); + regmap_write(data->regmap, SI570_REG_CONTROL, SI570_CNTRL_FREEZE_M); + si570_update_rfreq(data); + regmap_write(data->regmap, SI570_REG_CONTROL, 0); + + /* Applying a new frequency (small change) can take up to 100us */ + usleep_range(100, 200); + + return 0; +} + +static int si570_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct clk_si570 *data = to_clk_si570(hw); + struct i2c_client *client = data->i2c_client; + int err; + + if (rate < SI570_MIN_FREQ || rate > data->max_freq) { + dev_err(&client->dev, + "requested frequency %lu Hz is out of range\n", rate); + return -EINVAL; + } + + if (div64_u64(abs(rate - data->frequency) * 10000LL, + data->frequency) < 35) + err = si570_set_frequency_small(data, rate); + else + err = si570_set_frequency(data, rate); + + if (err) + return err; + + data->frequency = rate; + + return 0; +} + +static const struct clk_ops si570_clk_ops = { + .recalc_rate = si570_recalc_rate, + .round_rate = si570_round_rate, + .set_rate = si570_set_rate, +}; + +static bool si570_regmap_is_volatile(struct device *dev, unsigned int reg) +{ + switch (reg) { + case SI570_REG_CONTROL: + return true; + default: + return false; + } +} + +static bool si570_regmap_is_writeable(struct device *dev, unsigned int reg) +{ + switch (reg) { + case SI570_REG_HS_N1 ... (SI570_REG_RFREQ4 + SI570_DIV_OFFSET_7PPM): + case SI570_REG_CONTROL: + case SI570_REG_FREEZE_DCO: + return true; + default: + return false; + } +} + +static const struct regmap_config si570_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .cache_type = REGCACHE_RBTREE, + .max_register = 137, + .writeable_reg = si570_regmap_is_writeable, + .volatile_reg = si570_regmap_is_volatile, +}; + +static const struct i2c_device_id si570_id[] = { + { "si570", si57x }, + { "si571", si57x }, + { "si598", si59x }, + { "si599", si59x }, + { } +}; +MODULE_DEVICE_TABLE(i2c, si570_id); + +static int si570_probe(struct i2c_client *client) +{ + struct clk_si570 *data; + struct clk_init_data init; + const struct i2c_device_id *id = i2c_match_id(si570_id, client); + u32 initial_fout, factory_fout, stability; + bool skip_recall; + int err; + enum clk_si570_variant variant = id->driver_data; + + data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + init.ops = &si570_clk_ops; + init.flags = 0; + init.num_parents = 0; + data->hw.init = &init; + data->i2c_client = client; + + if (variant == si57x) { + err = of_property_read_u32(client->dev.of_node, + "temperature-stability", &stability); + if (err) { + dev_err(&client->dev, + "'temperature-stability' property missing\n"); + return err; + } + /* adjust register offsets for 7ppm devices */ + if (stability == 7) + data->div_offset = SI570_DIV_OFFSET_7PPM; + + data->max_freq = SI570_MAX_FREQ; + } else { + data->max_freq = SI598_MAX_FREQ; + } + + if (of_property_read_string(client->dev.of_node, "clock-output-names", + &init.name)) + init.name = client->dev.of_node->name; + + err = of_property_read_u32(client->dev.of_node, "factory-fout", + &factory_fout); + if (err) { + dev_err(&client->dev, "'factory-fout' property missing\n"); + return err; + } + + skip_recall = of_property_read_bool(client->dev.of_node, + "silabs,skip-recall"); + + data->regmap = devm_regmap_init_i2c(client, &si570_regmap_config); + if (IS_ERR(data->regmap)) { + dev_err(&client->dev, "failed to allocate register map\n"); + return PTR_ERR(data->regmap); + } + + i2c_set_clientdata(client, data); + err = si570_get_defaults(data, factory_fout, skip_recall); + if (err) + return err; + + err = devm_clk_hw_register(&client->dev, &data->hw); + if (err) { + dev_err(&client->dev, "clock registration failed\n"); + return err; + } + err = of_clk_add_hw_provider(client->dev.of_node, of_clk_hw_simple_get, + &data->hw); + if (err) { + dev_err(&client->dev, "unable to add clk provider\n"); + return err; + } + + /* Read the requested initial output frequency from device tree */ + if (!of_property_read_u32(client->dev.of_node, "clock-frequency", + &initial_fout)) { + err = clk_set_rate(data->hw.clk, initial_fout); + if (err) { + of_clk_del_provider(client->dev.of_node); + return err; + } + } + + /* Display a message indicating that we've successfully registered */ + dev_info(&client->dev, "registered, current frequency %llu Hz\n", + data->frequency); + + return 0; +} + +static void si570_remove(struct i2c_client *client) +{ + of_clk_del_provider(client->dev.of_node); +} + +static const struct of_device_id clk_si570_of_match[] = { + { .compatible = "silabs,si570" }, + { .compatible = "silabs,si571" }, + { .compatible = "silabs,si598" }, + { .compatible = "silabs,si599" }, + { }, +}; +MODULE_DEVICE_TABLE(of, clk_si570_of_match); + +static struct i2c_driver si570_driver = { + .driver = { + .name = "si570", + .of_match_table = clk_si570_of_match, + }, + .probe_new = si570_probe, + .remove = si570_remove, + .id_table = si570_id, +}; +module_i2c_driver(si570_driver); + +MODULE_AUTHOR("Guenter Roeck "); +MODULE_AUTHOR("Soeren Brinkmann "); +MODULE_DESCRIPTION("Si570 driver"); +MODULE_LICENSE("GPL"); -- cgit v1.2.3