From 4352b8aee98005853aa63f57d6377282de17a33f Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 23 Aug 2026 13:28:57 -0700 Subject: Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux Pull I3C updates from Alexandre Belloni: "A new driver this cycle, for the AMD AXI I3C controller. There are also new features such as IBI wakeup support, SETAASA device discovery and ACPI support for the the DAA methods, meaning we can now communicate with the SPD devices on DDR5 modules. New driver: - AMD AXI I3C master controller Subsystem: - I3C Common Command Code (CCC) handling improvements, especially around GET CCCs - SETAASA device discovery support - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as well as I2C devices on I3C bus - IBI-based wakeup support Drivers: - dw: SETAASA support - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C controller support, PIO queue management support for HCI v1.2 - renesas: improve suspend to RAM support, add runtime PM support" * tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits) i3c: dw: reduce do_daa time if there's no client i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2 i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode i3c: dw: rename "pclk" to "apb" to match dt-binding i3c: dw: make struct dw_i3c_cmd smaller i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding i3c: renesas: Don't register devices when ENTDAA times out i3c: master: dw-i3c-master: fix OD timing for first broadcast i3c: mipi-i3c-hci: Advertise IBI wakeup capability i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev() i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI i3c: master: Reject IBI requests from non-IBI-capable devices i3c: master: Add helper to query bus wakeup requirements i3c: master: Report wakeup events for IBIs i3c: master: Support IBI-based wakeup capability i3c: master: Fix potential UAF in i3c_device_match() i3c: master: Fix potential UAF in i3c_device_uevent() i3c: Make dev->desc locking assumptions explicit i3c: master: Fix use-after-free of master->this ... --- drivers/regulator/rt4803.c | 215 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 215 insertions(+) create mode 100644 drivers/regulator/rt4803.c (limited to 'drivers/regulator/rt4803.c') diff --git a/drivers/regulator/rt4803.c b/drivers/regulator/rt4803.c new file mode 100644 index 000000000..34cd3f249 --- /dev/null +++ b/drivers/regulator/rt4803.c @@ -0,0 +1,215 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2023 Richtek Technology Corp. + * + * Author: ChiYuan Huang + */ + +#include +#include +#include +#include +#include +#include +#include + +#define RT4803_AUTO_MODE 1 +#define RT4803_FPWM_MODE 2 + +#define RT4803_REG_CONFIG 0x01 +#define RT4803_REG_VSELL 0x02 +#define RT4803_REG_VSELH 0x03 +#define RT4803_REG_ILIM 0x04 +#define RT4803_REG_STAT 0x05 + +#define RT4803_MODE_MASK GENMASK(1, 0) +#define RT4803_VSEL_MASK GENMASK(4, 0) +#define RT4803_ILIM_MASK GENMASK(3, 0) +#define RT4803_TSD_MASK BIT(7) +#define RT4803_HOTDIE_MASK BIT(6) +#define RT4803_FAULT_MASK BIT(1) +#define RT4803_PGOOD_MASK BIT(0) + +#define RT4803_VOUT_MINUV 2850000 +#define RT4803_VOUT_STEPUV 50000 +#define RT4803_VOUT_NUM 32 + +static int rt4803_set_mode(struct regulator_dev *rdev, unsigned int mode) +{ + struct regmap *regmap = rdev_get_regmap(rdev); + unsigned int modeval; + + switch (mode) { + case REGULATOR_MODE_NORMAL: + modeval = RT4803_AUTO_MODE; + break; + case REGULATOR_MODE_FAST: + modeval = RT4803_FPWM_MODE; + break; + default: + return -EINVAL; + } + + modeval <<= ffs(RT4803_MODE_MASK) - 1; + + return regmap_update_bits(regmap, RT4803_REG_CONFIG, RT4803_MODE_MASK, modeval); +} + +static unsigned int rt4803_get_mode(struct regulator_dev *rdev) +{ + struct regmap *regmap = rdev_get_regmap(rdev); + unsigned int modeval; + int ret; + + ret = regmap_read(regmap, RT4803_REG_CONFIG, &modeval); + if (ret) + return REGULATOR_MODE_INVALID; + + modeval >>= ffs(RT4803_MODE_MASK) - 1; + + switch (modeval) { + case RT4803_AUTO_MODE: + return REGULATOR_MODE_NORMAL; + case RT4803_FPWM_MODE: + return REGULATOR_MODE_FAST; + default: + return REGULATOR_MODE_INVALID; + } +} + +static int rt4803_get_error_flags(struct regulator_dev *rdev, unsigned int *flags) +{ + struct regmap *regmap = rdev_get_regmap(rdev); + unsigned int state, events = 0; + int ret; + + ret = regmap_read(regmap, RT4803_REG_STAT, &state); + if (ret) + return ret; + + if (state & RT4803_PGOOD_MASK) + goto out_error_flag; + + if (state & RT4803_FAULT_MASK) + events |= REGULATOR_ERROR_FAIL; + + if (state & RT4803_HOTDIE_MASK) + events |= REGULATOR_ERROR_OVER_TEMP_WARN; + + if (state & RT4803_TSD_MASK) + events |= REGULATOR_ERROR_OVER_TEMP; + +out_error_flag: + *flags = events; + return 0; +} + +static int rt4803_set_suspend_voltage(struct regulator_dev *rdev, int uV) +{ + struct regmap *regmap = rdev_get_regmap(rdev); + unsigned int reg, vsel; + + if (rdev->desc->vsel_reg == RT4803_REG_VSELL) + reg = RT4803_REG_VSELH; + else + reg = RT4803_REG_VSELL; + + vsel = (uV - rdev->desc->min_uV) / rdev->desc->uV_step; + vsel <<= ffs(RT4803_VSEL_MASK) - 1; + + return regmap_update_bits(regmap, reg, RT4803_VSEL_MASK, vsel); +} + +static const struct regulator_ops rt4803_regulator_ops = { + .list_voltage = regulator_list_voltage_linear, + .set_voltage_sel = regulator_set_voltage_sel_regmap, + .get_voltage_sel = regulator_get_voltage_sel_regmap, + .set_mode = rt4803_set_mode, + .get_mode = rt4803_get_mode, + .get_error_flags = rt4803_get_error_flags, + .set_suspend_voltage = rt4803_set_suspend_voltage, +}; + +static unsigned int rt4803_of_map_mode(unsigned int mode) +{ + switch (mode) { + case RT4803_AUTO_MODE: + return REGULATOR_MODE_NORMAL; + case RT4803_FPWM_MODE: + return REGULATOR_MODE_FAST; + default: + return REGULATOR_MODE_INVALID; + } +} + +static const struct regmap_config rt4803_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = RT4803_REG_STAT, +}; + +static int rt4803_probe(struct i2c_client *i2c) +{ + struct device *dev = &i2c->dev; + struct regmap *regmap; + struct regulator_desc *desc; + struct regulator_config cfg = {}; + struct regulator_dev *rdev; + bool vsel_act_high; + int ret; + + desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL); + if (!desc) + return -ENOMEM; + + regmap = devm_regmap_init_i2c(i2c, &rt4803_regmap_config); + if (IS_ERR(regmap)) + return dev_err_probe(dev, PTR_ERR(regmap), "Failed to init regmap\n"); + + /* Always configure the input current limit to max 5A at initial */ + ret = regmap_update_bits(regmap, RT4803_REG_ILIM, RT4803_ILIM_MASK, 0xff); + if (ret) + return dev_err_probe(dev, ret, "Failed to config ILIM to max\n"); + + vsel_act_high = device_property_read_bool(dev, "richtek,vsel-active-high"); + + desc->name = "rt4803-regulator"; + desc->type = REGULATOR_VOLTAGE; + desc->owner = THIS_MODULE; + desc->ops = &rt4803_regulator_ops; + desc->min_uV = RT4803_VOUT_MINUV; + desc->uV_step = RT4803_VOUT_STEPUV; + desc->n_voltages = RT4803_VOUT_NUM; + desc->vsel_mask = RT4803_VSEL_MASK; + desc->of_map_mode = rt4803_of_map_mode; + if (vsel_act_high) + desc->vsel_reg = RT4803_REG_VSELH; + else + desc->vsel_reg = RT4803_REG_VSELL; + + cfg.dev = dev; + cfg.of_node = dev_of_node(dev); + cfg.init_data = of_get_regulator_init_data(dev, dev_of_node(dev), desc); + + rdev = devm_regulator_register(dev, desc, &cfg); + return PTR_ERR_OR_ZERO(rdev); +} + +static const struct of_device_id rt4803_device_match_table[] = { + { .compatible = "richtek,rt4803" }, + {} +}; +MODULE_DEVICE_TABLE(of, rt4803_device_match_table); + +static struct i2c_driver rt4803_driver = { + .driver = { + .name = "rt4803", + .of_match_table = rt4803_device_match_table, + }, + .probe = rt4803_probe, +}; +module_i2c_driver(rt4803_driver); + +MODULE_DESCRIPTION("Richtek RT4803 voltage regulator driver"); +MODULE_AUTHOR("ChiYuan Huang "); +MODULE_LICENSE("GPL"); -- cgit v1.3.1