* [PATCH v1 1/2] regulator: rt6245: Add the binding document for Richtek RT6245 @ 2021-05-26 6:12 cy_huang 2021-05-26 6:12 ` [PATCH v1 2/2] regulator: rt6245: Add support " cy_huang 0 siblings, 1 reply; 5+ messages in thread From: cy_huang @ 2021-05-26 6:12 UTC (permalink / raw) To: lgirdwood, broonie, robh+dt; +Cc: cy_huang, linux-kernel, devicetree From: ChiYuan Huang <cy_huang@richtek.com> Add the binding document for Richtek RT6245. Signed-off-by: ChiYuan Huang <cy_huang@richtek.com> --- .../regulator/richtek,rt6245-regulator.yaml | 89 ++++++++++++++++++++++ 1 file changed, 89 insertions(+) create mode 100644 Documentation/devicetree/bindings/regulator/richtek,rt6245-regulator.yaml diff --git a/Documentation/devicetree/bindings/regulator/richtek,rt6245-regulator.yaml b/Documentation/devicetree/bindings/regulator/richtek,rt6245-regulator.yaml new file mode 100644 index 00000000..796ceac --- /dev/null +++ b/Documentation/devicetree/bindings/regulator/richtek,rt6245-regulator.yaml @@ -0,0 +1,89 @@ +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/regulator/richtek,rt6245-regulator.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Richtek RT6245 High Current Voltage Regulator + +maintainers: + - ChiYuan Huang <cy_huang@richtek.com> + +description: | + The RT6245 is a high-performance, synchronous step-down converter + that can deliver up to 14A output current with an input supply + voltage range of 4.5V to 17V. + +allOf: + - $ref: regulator.yaml# + +properties: + compatible: + enum: + - richtek,rt6245 + + reg: + maxItems: 1 + + enable-gpios: + description: | + A connection of the chip 'enable' gpio line. If not provided, + it will be treat as a default-on power. + maxItems: 1 + + richtek,oc-level-select: + $ref: "/schemas/types.yaml#/definitions/uint8" + enum: [0, 1, 2, 3] + description: | + Over current level selection. Each respective value means the current + limit 8A, 14A, 12A, 10A. If this property is missing then keep in + in chip default. + + richtek,ot-level-select: + $ref: "/schemas/types.yaml#/definitions/uint8" + enum: [0, 1, 2] + description: | + Over temperature level selection. Each respective value means the degree + 150'c, 130'c, 170'c. If this property is missing then keep in chip + default. + + richtek,pgdly-time-select: + $ref: "/schemas/types.yaml#/definitions/uint8" + enum: [0, 1, 2, 3] + description: | + Power good signal delay time selection. Each respective value means the + delay time 0us, 10us, 20us, 40us. If this property is missing then keep + in chip default. + + + richtek,switch-freq-select: + $ref: "/schemas/types.yaml#/definitions/uint8" + enum: [0, 1, 2] + description: | + Buck switch frequency selection. Each respective value means 400KHz, + 800KHz, 1200KHz. If this property is missing then keep in chip default. + +required: + - compatible + - reg + +unevaluatedProperties: false + +examples: + - | + i2c { + #address-cells = <1>; + #size-cells = <0>; + + rt6245@34 { + compatible = "richtek,rt6245"; + status = "okay"; + reg = <0x34>; + enable-gpios = <&gpio26 2 0>; + + regulator-name = "rt6245-regulator"; + regulator-min-microvolt = <437500>; + regulator-max-microvolt = <1387500>; + regulator-boot-on; + }; + }; -- 2.7.4 ^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH v1 2/2] regulator: rt6245: Add support for Richtek RT6245 2021-05-26 6:12 [PATCH v1 1/2] regulator: rt6245: Add the binding document for Richtek RT6245 cy_huang @ 2021-05-26 6:12 ` cy_huang 2021-05-26 18:21 ` Mark Brown 0 siblings, 1 reply; 5+ messages in thread From: cy_huang @ 2021-05-26 6:12 UTC (permalink / raw) To: lgirdwood, broonie, robh+dt; +Cc: cy_huang, linux-kernel, devicetree From: ChiYuan Huang <cy_huang@richtek.com> Richtek RT6245 is a high-performance, synchronous step-down converter that can deliver up to 14A output current with an input supply voltage range of 4.5V to 17V. Signed-off-by: ChiYuan Huang <cy_huang@richtek.com> --- drivers/regulator/Kconfig | 9 ++ drivers/regulator/Makefile | 1 + drivers/regulator/rt6245-regulator.c | 260 +++++++++++++++++++++++++++++++++++ 3 files changed, 270 insertions(+) create mode 100644 drivers/regulator/rt6245-regulator.c diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig index 9d84d92..cdec434 100644 --- a/drivers/regulator/Kconfig +++ b/drivers/regulator/Kconfig @@ -1030,6 +1030,15 @@ config REGULATOR_RT5033 RT5033 PMIC. The device supports multiple regulators like current source, LDO and Buck. +config REGULATOR_RT6245 + tristate "Richtek RT6245 voltage regulator" + depends on I2C + select REGMAP_I2C + help + This adds supprot for Richtek RT6245 voltage regulator. + It can support up to 14A output current and adjustable output voltage + from 0.4375V to 1.3875V, per step 12.5mV. + config REGULATOR_RTMV20 tristate "RTMV20 Laser Diode Regulator" depends on I2C diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile index 580b015..69668bf 100644 --- a/drivers/regulator/Makefile +++ b/drivers/regulator/Makefile @@ -124,6 +124,7 @@ obj-$(CONFIG_REGULATOR_ROHM) += rohm-regulator.o obj-$(CONFIG_REGULATOR_RT4801) += rt4801-regulator.o obj-$(CONFIG_REGULATOR_RT4831) += rt4831-regulator.o obj-$(CONFIG_REGULATOR_RT5033) += rt5033-regulator.o +obj-$(CONFIG_REGULATOR_RT6245) += rt6245-regulator.o obj-$(CONFIG_REGULATOR_RTMV20) += rtmv20-regulator.o obj-$(CONFIG_REGULATOR_S2MPA01) += s2mpa01.o obj-$(CONFIG_REGULATOR_S2MPS11) += s2mps11.o diff --git a/drivers/regulator/rt6245-regulator.c b/drivers/regulator/rt6245-regulator.c new file mode 100644 index 00000000..bd676f8 --- /dev/null +++ b/drivers/regulator/rt6245-regulator.c @@ -0,0 +1,260 @@ +// SPDX-License-Identifier: GPL-2.0+ + +#include <linux/bitops.h> +#include <linux/delay.h> +#include <linux/gpio/consumer.h> +#include <linux/i2c.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/regmap.h> +#include <linux/regulator/driver.h> +#include <linux/regulator/of_regulator.h> + +#define RT6245_VIRT_OCLIMIT 0x00 +#define RT6245_VIRT_OTLEVEL 0x01 +#define RT6245_VIRT_PGDLYTIME 0x02 +#define RT6245_VIRT_SLEWRATE 0x03 +#define RT6245_VIRT_SWFREQ 0x04 +#define RT6245_VIRT_VOUT 0x05 + +#define RT6245_VOUT_MASK GENMASK(6, 0) +#define RT6245_CHKSUM_MASK BIT(7) +#define RT6245_CODE_MASK GENMASK(6, 0) + +/* HW Enable + Soft start time */ +#define RT6245_ENTIME_IN_US 5000 + +#define RT6245_RAMPT_UNIT_0P1UV 15625 +#define RT6245_RAMPT_MAXUV 12500 +#define RT6245_RAMPT_BASESEL 1 + +#define RT6245_VOUT_MINUV 437500 +#define RT6245_VOUT_MAXUV 1387500 +#define RT6245_VOUT_STEPUV 12500 +#define RT6245_NUM_VOUT ((RT6245_VOUT_MAXUV - RT6245_VOUT_MINUV) / RT6245_VOUT_STEPUV + 1) + +struct rt6245_priv { + struct gpio_desc *enable_gpio; + bool enable_state; +}; + +static int rt6245_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay) +{ + struct regmap *regmap = rdev_get_regmap(rdev); + unsigned int ramp_time_scale; + + if (ramp_delay == 0 || ramp_delay > RT6245_RAMPT_MAXUV) { + dev_warn(&rdev->dev, "Not in ramp time range %d, set to fastest\n", ramp_delay); + ramp_delay = RT6245_RAMPT_MAXUV; + } + + /* ramp_time = max_ramp_time / ramp_time_scale, scale from 1 to 8 */ + ramp_delay = max(ramp_delay * 10, RT6245_RAMPT_UNIT_0P1UV); + ramp_time_scale = (RT6245_RAMPT_MAXUV * 10) / ramp_delay; + ramp_time_scale -= RT6245_RAMPT_BASESEL; + + return regmap_write(regmap, RT6245_VIRT_SLEWRATE, ramp_time_scale); +} + +static int rt6245_enable(struct regulator_dev *rdev) +{ + struct rt6245_priv *priv = rdev_get_drvdata(rdev); + struct regmap *regmap = rdev_get_regmap(rdev); + + if (!priv->enable_gpio) + return 0; + + priv->enable_state = true; + gpiod_direction_output(priv->enable_gpio, 1); + usleep_range(RT6245_ENTIME_IN_US, RT6245_ENTIME_IN_US + 1000); + + regcache_cache_only(regmap, false); + return regcache_sync(regmap); +} + +static int rt6245_disable(struct regulator_dev *rdev) +{ + struct rt6245_priv *priv = rdev_get_drvdata(rdev); + struct regmap *regmap = rdev_get_regmap(rdev); + + if (!priv->enable_gpio) + return -ENOTSUPP; + + priv->enable_state = false; + gpiod_direction_output(priv->enable_gpio, 0); + + regcache_cache_only(regmap, true); + regcache_mark_dirty(regmap); + + return 0; +} + +static int rt6245_is_enabled(struct regulator_dev *rdev) +{ + struct rt6245_priv *priv = rdev_get_drvdata(rdev); + + return priv->enable_state ? 1 : 0; +} + +static const struct regulator_ops rt6245_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_ramp_delay = rt6245_set_ramp_delay, + .enable = rt6245_enable, + .disable = rt6245_disable, + .is_enabled = rt6245_is_enabled, +}; + +static const struct regulator_desc rt6245_regulator_desc = { + .name = "rt6245-regulator", + .ops = &rt6245_regulator_ops, + .type = REGULATOR_VOLTAGE, + .min_uV = RT6245_VOUT_MINUV, + .uV_step = RT6245_VOUT_STEPUV, + .n_voltages = RT6245_NUM_VOUT, + .owner = THIS_MODULE, + .vsel_reg = RT6245_VIRT_VOUT, + .vsel_mask = RT6245_VOUT_MASK, +}; + +static int rt6245_init_device_properties(struct device *dev) +{ + struct { + const char *name; + unsigned int reg; + } rt6245_props[] = { + { "richtek,oc-level-select", RT6245_VIRT_OCLIMIT }, + { "richtek,ot-level-select", RT6245_VIRT_OTLEVEL }, + { "richtek,pgdly-time-select", RT6245_VIRT_PGDLYTIME }, + { "richtek,switch-freq-select", RT6245_VIRT_SWFREQ } + }; + struct regmap *regmap = dev_get_regmap(dev, NULL); + u8 propval; + int i, ret; + + for (i = 0; i < ARRAY_SIZE(rt6245_props); i++) { + ret = device_property_read_u8(dev, rt6245_props[i].name, &propval); + if (ret) + continue; + + ret = regmap_write(regmap, rt6245_props[i].reg, propval); + if (ret) { + dev_err(dev, "Fail to apply [%s:%d]\n", rt6245_props[i].name, propval); + return ret; + } + } + + return 0; +} + +static int rt6245_reg_write(void *context, unsigned int reg, unsigned int val) +{ + struct i2c_client *i2c = context; + const u8 func_base[] = { 0x6F, 0x73, 0x78, 0x61, 0x7C, 0 }; + unsigned int code, bit_count; + + code = func_base[reg]; + code += val; + + /* xor checksum for bit 6 to 0 */ + bit_count = __sw_hweight8(code & RT6245_CODE_MASK); + if (bit_count % 2) + code |= RT6245_CHKSUM_MASK; + else + code &= ~RT6245_CHKSUM_MASK; + + return i2c_smbus_write_byte(i2c, code); +} + +static const struct reg_default rt6245_reg_defaults[] = { + /* Default over current 14A */ + { RT6245_VIRT_OCLIMIT, 2 }, + /* Default over temperature 150'c */ + { RT6245_VIRT_OTLEVEL, 0 }, + /* Default power good delay time 10us */ + { RT6245_VIRT_PGDLYTIME, 1 }, + /* Default slewrate 12.5mV/uS */ + { RT6245_VIRT_SLEWRATE, 0 }, + /* Default switch frequency 800KHz */ + { RT6245_VIRT_SWFREQ, 1 }, + /* Default voltage 750mV */ + { RT6245_VIRT_VOUT, 0x19 } +}; + +static const struct regmap_config rt6245_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = RT6245_VIRT_VOUT, + .cache_type = REGCACHE_FLAT, + .reg_defaults = rt6245_reg_defaults, + .num_reg_defaults = ARRAY_SIZE(rt6245_reg_defaults), + .reg_write = rt6245_reg_write, +}; + +static int rt6245_probe(struct i2c_client *i2c) +{ + struct rt6245_priv *priv; + struct regmap *regmap; + struct regulator_config regulator_cfg = {}; + struct regulator_dev *rdev; + int ret; + + priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->enable_state = true; + + priv->enable_gpio = devm_gpiod_get_optional(&i2c->dev, "enable", GPIOD_OUT_HIGH); + if (IS_ERR(priv->enable_gpio)) { + dev_err(&i2c->dev, "Failed to get 'enable' gpio\n"); + return PTR_ERR(priv->enable_gpio); + } + usleep_range(RT6245_ENTIME_IN_US, RT6245_ENTIME_IN_US + 1000); + + regmap = devm_regmap_init(&i2c->dev, NULL, i2c, &rt6245_regmap_config); + if (IS_ERR(regmap)) { + dev_err(&i2c->dev, "Failed to initialize the regmap\n"); + return PTR_ERR(regmap); + } + + ret = rt6245_init_device_properties(&i2c->dev); + if (ret) { + dev_err(&i2c->dev, "Failed to initialize device properties\n"); + return ret; + } + + regulator_cfg.dev = &i2c->dev; + regulator_cfg.of_node = i2c->dev.of_node; + regulator_cfg.regmap = regmap; + regulator_cfg.driver_data = priv; + regulator_cfg.init_data = of_get_regulator_init_data(&i2c->dev, i2c->dev.of_node, + &rt6245_regulator_desc); + rdev = devm_regulator_register(&i2c->dev, &rt6245_regulator_desc, ®ulator_cfg); + if (IS_ERR(rdev)) { + dev_err(&i2c->dev, "Failed to register regulator\n"); + return PTR_ERR(rdev); + } + + return 0; +} + +static const struct of_device_id __maybe_unused rt6245_of_match_table[] = { + { .compatible = "richtek,rt6245", }, + {} +}; +MODULE_DEVICE_TABLE(of, rt6245_of_match_table); + +static struct i2c_driver rt6245_driver = { + .driver = { + .name = "rt6245", + .of_match_table = rt6245_of_match_table, + }, + .probe_new = rt6245_probe, +}; +module_i2c_driver(rt6245_driver); + +MODULE_AUTHOR("ChiYuan Hwang <cy_huang@richtek.com>"); +MODULE_DESCRIPTION("Richtek RT6245 Regulator Driver"); +MODULE_LICENSE("GPL v2"); -- 2.7.4 ^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH v1 2/2] regulator: rt6245: Add support for Richtek RT6245 2021-05-26 6:12 ` [PATCH v1 2/2] regulator: rt6245: Add support " cy_huang @ 2021-05-26 18:21 ` Mark Brown 2021-05-27 3:54 ` ChiYuan Huang 0 siblings, 1 reply; 5+ messages in thread From: Mark Brown @ 2021-05-26 18:21 UTC (permalink / raw) To: cy_huang; +Cc: lgirdwood, robh+dt, cy_huang, linux-kernel, devicetree [-- Attachment #1: Type: text/plain, Size: 285 bytes --] On Wed, May 26, 2021 at 02:12:58PM +0800, cy_huang wrote: > + /* xor checksum for bit 6 to 0 */ > + bit_count = __sw_hweight8(code & RT6245_CODE_MASK); This doesn't compile with an x86 allmodconfig: ERROR: modpost: "__sw_hweight8" [drivers/regulator/rt6245-regulator.ko] undefined! [-- Attachment #2: signature.asc --] [-- Type: application/pgp-signature, Size: 488 bytes --] ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH v1 2/2] regulator: rt6245: Add support for Richtek RT6245 2021-05-26 18:21 ` Mark Brown @ 2021-05-27 3:54 ` ChiYuan Huang 0 siblings, 0 replies; 5+ messages in thread From: ChiYuan Huang @ 2021-05-27 3:54 UTC (permalink / raw) To: Mark Brown Cc: lgirdwood, Rob Herring, cy_huang, lkml, open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS HI, Mark Brown <broonie@kernel.org> 於 2021年5月27日 週四 上午2:21寫道： > > On Wed, May 26, 2021 at 02:12:58PM +0800, cy_huang wrote: > > > + /* xor checksum for bit 6 to 0 */ > > + bit_count = __sw_hweight8(code & RT6245_CODE_MASK); > > This doesn't compile with an x86 allmodconfig: > > ERROR: modpost: "__sw_hweight8" [drivers/regulator/rt6245-regulator.ko] undefined! I think I found the problem, x86 only defined __sw_hweight32 and __sw_hweight64. If user touch hweight8 or 16, it will auto convert to use thest two functions. And the x86 arch didn't define __sw_hweight8 or __sw_hweight16. The best way is to use hweight8 macro and let the macro convert it to arch_hweight8 Ack in next, Thanks for reminding me. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH v1 0/2] This patch series add Richtek RT6245 support @ 2021-05-26 6:08 cy_huang 2021-05-26 6:08 ` [PATCH v1 2/2] regulator: rt6245: Add support for Richtek RT6245 cy_huang 0 siblings, 1 reply; 5+ messages in thread From: cy_huang @ 2021-05-26 6:08 UTC (permalink / raw) To: lgirdwood, broonie, robh+dt, cy_huang; +Cc: linux-kernel, devicetree Richtek RT6245 is a high-performance, step-down converter that can support up to 14A output current with the wide input voltage range from 4.5V to 17V. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH v1 2/2] regulator: rt6245: Add support for Richtek RT6245 2021-05-26 6:08 [PATCH v1 0/2] This patch series add Richtek RT6245 support cy_huang @ 2021-05-26 6:08 ` cy_huang 0 siblings, 0 replies; 5+ messages in thread From: cy_huang @ 2021-05-26 6:08 UTC (permalink / raw) To: lgirdwood, broonie, robh+dt, cy_huang; +Cc: linux-kernel, devicetree From: ChiYuan Huang <cy_huang@richtek.com> Richtek RT6245 is a high-performance, synchronous step-down converter that can deliver up to 14A output current with an input supply voltage range of 4.5V to 17V. Signed-off-by: ChiYuan Huang <cy_huang@richtek.com> --- drivers/regulator/Kconfig | 9 ++ drivers/regulator/Makefile | 1 + drivers/regulator/rt6245-regulator.c | 260 +++++++++++++++++++++++++++++++++++ 3 files changed, 270 insertions(+) create mode 100644 drivers/regulator/rt6245-regulator.c diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig index 9d84d92..cdec434 100644 --- a/drivers/regulator/Kconfig +++ b/drivers/regulator/Kconfig @@ -1030,6 +1030,15 @@ config REGULATOR_RT5033 RT5033 PMIC. The device supports multiple regulators like current source, LDO and Buck. +config REGULATOR_RT6245 + tristate "Richtek RT6245 voltage regulator" + depends on I2C + select REGMAP_I2C + help + This adds supprot for Richtek RT6245 voltage regulator. + It can support up to 14A output current and adjustable output voltage + from 0.4375V to 1.3875V, per step 12.5mV. + config REGULATOR_RTMV20 tristate "RTMV20 Laser Diode Regulator" depends on I2C diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile index 580b015..69668bf 100644 --- a/drivers/regulator/Makefile +++ b/drivers/regulator/Makefile @@ -124,6 +124,7 @@ obj-$(CONFIG_REGULATOR_ROHM) += rohm-regulator.o obj-$(CONFIG_REGULATOR_RT4801) += rt4801-regulator.o obj-$(CONFIG_REGULATOR_RT4831) += rt4831-regulator.o obj-$(CONFIG_REGULATOR_RT5033) += rt5033-regulator.o +obj-$(CONFIG_REGULATOR_RT6245) += rt6245-regulator.o obj-$(CONFIG_REGULATOR_RTMV20) += rtmv20-regulator.o obj-$(CONFIG_REGULATOR_S2MPA01) += s2mpa01.o obj-$(CONFIG_REGULATOR_S2MPS11) += s2mps11.o diff --git a/drivers/regulator/rt6245-regulator.c b/drivers/regulator/rt6245-regulator.c new file mode 100644 index 00000000..bd676f8 --- /dev/null +++ b/drivers/regulator/rt6245-regulator.c @@ -0,0 +1,260 @@ +// SPDX-License-Identifier: GPL-2.0+ + +#include <linux/bitops.h> +#include <linux/delay.h> +#include <linux/gpio/consumer.h> +#include <linux/i2c.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/regmap.h> +#include <linux/regulator/driver.h> +#include <linux/regulator/of_regulator.h> + +#define RT6245_VIRT_OCLIMIT 0x00 +#define RT6245_VIRT_OTLEVEL 0x01 +#define RT6245_VIRT_PGDLYTIME 0x02 +#define RT6245_VIRT_SLEWRATE 0x03 +#define RT6245_VIRT_SWFREQ 0x04 +#define RT6245_VIRT_VOUT 0x05 + +#define RT6245_VOUT_MASK GENMASK(6, 0) +#define RT6245_CHKSUM_MASK BIT(7) +#define RT6245_CODE_MASK GENMASK(6, 0) + +/* HW Enable + Soft start time */ +#define RT6245_ENTIME_IN_US 5000 + +#define RT6245_RAMPT_UNIT_0P1UV 15625 +#define RT6245_RAMPT_MAXUV 12500 +#define RT6245_RAMPT_BASESEL 1 + +#define RT6245_VOUT_MINUV 437500 +#define RT6245_VOUT_MAXUV 1387500 +#define RT6245_VOUT_STEPUV 12500 +#define RT6245_NUM_VOUT ((RT6245_VOUT_MAXUV - RT6245_VOUT_MINUV) / RT6245_VOUT_STEPUV + 1) + +struct rt6245_priv { + struct gpio_desc *enable_gpio; + bool enable_state; +}; + +static int rt6245_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay) +{ + struct regmap *regmap = rdev_get_regmap(rdev); + unsigned int ramp_time_scale; + + if (ramp_delay == 0 || ramp_delay > RT6245_RAMPT_MAXUV) { + dev_warn(&rdev->dev, "Not in ramp time range %d, set to fastest\n", ramp_delay); + ramp_delay = RT6245_RAMPT_MAXUV; + } + + /* ramp_time = max_ramp_time / ramp_time_scale, scale from 1 to 8 */ + ramp_delay = max(ramp_delay * 10, RT6245_RAMPT_UNIT_0P1UV); + ramp_time_scale = (RT6245_RAMPT_MAXUV * 10) / ramp_delay; + ramp_time_scale -= RT6245_RAMPT_BASESEL; + + return regmap_write(regmap, RT6245_VIRT_SLEWRATE, ramp_time_scale); +} + +static int rt6245_enable(struct regulator_dev *rdev) +{ + struct rt6245_priv *priv = rdev_get_drvdata(rdev); + struct regmap *regmap = rdev_get_regmap(rdev); + + if (!priv->enable_gpio) + return 0; + + priv->enable_state = true; + gpiod_direction_output(priv->enable_gpio, 1); + usleep_range(RT6245_ENTIME_IN_US, RT6245_ENTIME_IN_US + 1000); + + regcache_cache_only(regmap, false); + return regcache_sync(regmap); +} + +static int rt6245_disable(struct regulator_dev *rdev) +{ + struct rt6245_priv *priv = rdev_get_drvdata(rdev); + struct regmap *regmap = rdev_get_regmap(rdev); + + if (!priv->enable_gpio) + return -ENOTSUPP; + + priv->enable_state = false; + gpiod_direction_output(priv->enable_gpio, 0); + + regcache_cache_only(regmap, true); + regcache_mark_dirty(regmap); + + return 0; +} + +static int rt6245_is_enabled(struct regulator_dev *rdev) +{ + struct rt6245_priv *priv = rdev_get_drvdata(rdev); + + return priv->enable_state ? 1 : 0; +} + +static const struct regulator_ops rt6245_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_ramp_delay = rt6245_set_ramp_delay, + .enable = rt6245_enable, + .disable = rt6245_disable, + .is_enabled = rt6245_is_enabled, +}; + +static const struct regulator_desc rt6245_regulator_desc = { + .name = "rt6245-regulator", + .ops = &rt6245_regulator_ops, + .type = REGULATOR_VOLTAGE, + .min_uV = RT6245_VOUT_MINUV, + .uV_step = RT6245_VOUT_STEPUV, + .n_voltages = RT6245_NUM_VOUT, + .owner = THIS_MODULE, + .vsel_reg = RT6245_VIRT_VOUT, + .vsel_mask = RT6245_VOUT_MASK, +}; + +static int rt6245_init_device_properties(struct device *dev) +{ + struct { + const char *name; + unsigned int reg; + } rt6245_props[] = { + { "richtek,oc-level-select", RT6245_VIRT_OCLIMIT }, + { "richtek,ot-level-select", RT6245_VIRT_OTLEVEL }, + { "richtek,pgdly-time-select", RT6245_VIRT_PGDLYTIME }, + { "richtek,switch-freq-select", RT6245_VIRT_SWFREQ } + }; + struct regmap *regmap = dev_get_regmap(dev, NULL); + u8 propval; + int i, ret; + + for (i = 0; i < ARRAY_SIZE(rt6245_props); i++) { + ret = device_property_read_u8(dev, rt6245_props[i].name, &propval); + if (ret) + continue; + + ret = regmap_write(regmap, rt6245_props[i].reg, propval); + if (ret) { + dev_err(dev, "Fail to apply [%s:%d]\n", rt6245_props[i].name, propval); + return ret; + } + } + + return 0; +} + +static int rt6245_reg_write(void *context, unsigned int reg, unsigned int val) +{ + struct i2c_client *i2c = context; + const u8 func_base[] = { 0x6F, 0x73, 0x78, 0x61, 0x7C, 0 }; + unsigned int code, bit_count; + + code = func_base[reg]; + code += val; + + /* xor checksum for bit 6 to 0 */ + bit_count = __sw_hweight8(code & RT6245_CODE_MASK); + if (bit_count % 2) + code |= RT6245_CHKSUM_MASK; + else + code &= ~RT6245_CHKSUM_MASK; + + return i2c_smbus_write_byte(i2c, code); +} + +static const struct reg_default rt6245_reg_defaults[] = { + /* Default over current 14A */ + { RT6245_VIRT_OCLIMIT, 2 }, + /* Default over temperature 150'c */ + { RT6245_VIRT_OTLEVEL, 0 }, + /* Default power good delay time 10us */ + { RT6245_VIRT_PGDLYTIME, 1 }, + /* Default slewrate 12.5mV/uS */ + { RT6245_VIRT_SLEWRATE, 0 }, + /* Default switch frequency 800KHz */ + { RT6245_VIRT_SWFREQ, 1 }, + /* Default voltage 750mV */ + { RT6245_VIRT_VOUT, 0x19 } +}; + +static const struct regmap_config rt6245_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = RT6245_VIRT_VOUT, + .cache_type = REGCACHE_FLAT, + .reg_defaults = rt6245_reg_defaults, + .num_reg_defaults = ARRAY_SIZE(rt6245_reg_defaults), + .reg_write = rt6245_reg_write, +}; + +static int rt6245_probe(struct i2c_client *i2c) +{ + struct rt6245_priv *priv; + struct regmap *regmap; + struct regulator_config regulator_cfg = {}; + struct regulator_dev *rdev; + int ret; + + priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->enable_state = true; + + priv->enable_gpio = devm_gpiod_get_optional(&i2c->dev, "enable", GPIOD_OUT_HIGH); + if (IS_ERR(priv->enable_gpio)) { + dev_err(&i2c->dev, "Failed to get 'enable' gpio\n"); + return PTR_ERR(priv->enable_gpio); + } + usleep_range(RT6245_ENTIME_IN_US, RT6245_ENTIME_IN_US + 1000); + + regmap = devm_regmap_init(&i2c->dev, NULL, i2c, &rt6245_regmap_config); + if (IS_ERR(regmap)) { + dev_err(&i2c->dev, "Failed to initialize the regmap\n"); + return PTR_ERR(regmap); + } + + ret = rt6245_init_device_properties(&i2c->dev); + if (ret) { + dev_err(&i2c->dev, "Failed to initialize device properties\n"); + return ret; + } + + regulator_cfg.dev = &i2c->dev; + regulator_cfg.of_node = i2c->dev.of_node; + regulator_cfg.regmap = regmap; + regulator_cfg.driver_data = priv; + regulator_cfg.init_data = of_get_regulator_init_data(&i2c->dev, i2c->dev.of_node, + &rt6245_regulator_desc); + rdev = devm_regulator_register(&i2c->dev, &rt6245_regulator_desc, ®ulator_cfg); + if (IS_ERR(rdev)) { + dev_err(&i2c->dev, "Failed to register regulator\n"); + return PTR_ERR(rdev); + } + + return 0; +} + +static const struct of_device_id __maybe_unused rt6245_of_match_table[] = { + { .compatible = "richtek,rt6245", }, + {} +}; +MODULE_DEVICE_TABLE(of, rt6245_of_match_table); + +static struct i2c_driver rt6245_driver = { + .driver = { + .name = "rt6245", + .of_match_table = rt6245_of_match_table, + }, + .probe_new = rt6245_probe, +}; +module_i2c_driver(rt6245_driver); + +MODULE_AUTHOR("ChiYuan Hwang <cy_huang@richtek.com>"); +MODULE_DESCRIPTION("Richtek RT6245 Regulator Driver"); +MODULE_LICENSE("GPL v2"); -- 2.7.4 ^ permalink raw reply related [flat|nested] 5+ messages in thread
end of thread, other threads:[~2021-05-27 3:54 UTC | newest] Thread overview: 5+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2021-05-26 6:12 [PATCH v1 1/2] regulator: rt6245: Add the binding document for Richtek RT6245 cy_huang 2021-05-26 6:12 ` [PATCH v1 2/2] regulator: rt6245: Add support " cy_huang 2021-05-26 18:21 ` Mark Brown 2021-05-27 3:54 ` ChiYuan Huang -- strict thread matches above, loose matches on Subject: below -- 2021-05-26 6:08 [PATCH v1 0/2] This patch series add Richtek RT6245 support cy_huang 2021-05-26 6:08 ` [PATCH v1 2/2] regulator: rt6245: Add support for Richtek RT6245 cy_huang
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