* [PATCH 1/2] dt-bindings: power: Add Spreadtrum SC27XX fuel gauge unit documentation @ 2018-09-12 7:29 Baolin Wang 2018-09-12 7:29 ` [PATCH 2/2] power: supply: Add Spreadtrum SC27XX fuel gauge unit driver Baolin Wang ` (2 more replies) 0 siblings, 3 replies; 11+ messages in thread From: Baolin Wang @ 2018-09-12 7:29 UTC (permalink / raw) To: sre, robh+dt, mark.rutland Cc: linux-pm, devicetree, linux-kernel, yuanjiang.yu, baolin.wang, broonie This patch adds the binding documentation for Spreadtrum SC27XX series PMICs fuel gauge unit device, which is used to calculate the battery capacity. Signed-off-by: Baolin Wang <baolin.wang@linaro.org> --- .../devicetree/bindings/power/supply/sc27xx-fg.txt | 55 ++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt diff --git a/Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt b/Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt new file mode 100644 index 0000000..7447bae --- /dev/null +++ b/Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt @@ -0,0 +1,55 @@ +Spreadtrum SC27XX PMICs Fuel Gauge Unit Power Supply Bindings + +Required properties: +- compatible: Should be one of the following: + "sprd,sc2720-fgu", + "sprd,sc2721-fgu", + "sprd,sc2723-fgu", + "sprd,sc2730-fgu", + "sprd,sc2731-fgu". +- reg: The address offset of fuel gauge unit. +- bat-detect-gpio: GPIO for battery detection. +- io-channels: Specify the IIO ADC channel to get temperature. +- io-channel-names: Should be "bat-temp". +- sprd,inner-resist: Specify the the battery inner resistance (mOhm). +- sprd,ocv-cap-table: Provide the battery capacity percent with corresponding + open circuit voltage (ocv) of the battery, which is used to look up current + battery capacity according to current baterry ocv values. +- monitored-battery: Phandle of battery characteristics devicetree node. + The fuel gauge uses the following battery properties: +- charge-full-design-microamp-hours: battery design capacity. +- constant-charge-voltage-max-microvolt: maximum constant input voltage. + See Documentation/devicetree/bindings/power/supply/battery.txt + +Example: + + bat: battery { + compatible = "simple-battery"; + charge-full-design-microamp-hours = <1900000>; + constant-charge-voltage-max-microvolt = <4350000>; + ...... + }; + + sc2731_pmic: pmic@0 { + compatible = "sprd,sc2731"; + reg = <0>; + spi-max-frequency = <26000000>; + interrupts = <GIC_SPI 31 IRQ_TYPE_LEVEL_HIGH>; + interrupt-controller; + #interrupt-cells = <2>; + #address-cells = <1>; + #size-cells = <0>; + + fgu@a00 { + compatible = "sprd,sc2731-fgu"; + reg = <0xa00>; + bat-detect-gpio = <&pmic_eic 9 GPIO_ACTIVE_HIGH>; + io-channels = <&pmic_adc 5>; + io-channel-names = "bat-temp"; + sprd,inner-resist = <250>; + sprd,ocv-cap-table = <4185 100>, <4113 95>, <4066 90>, <4022 85>, <3983 80>, <3949 75>, <3917 70>, + <3889 65>, <3864 60>, <3835 55>, <3805 50>, <3787 45>, <3777 40>, <3773 35>, <3770 30>, + <3765 25>, <3752 20>, <3724 15>, <3680 10>, <3605 5>, <3400 0>; + monitored-battery = <&bat>; + }; + }; -- 1.7.9.5 ^ permalink raw reply related [flat|nested] 11+ messages in thread
* [PATCH 2/2] power: supply: Add Spreadtrum SC27XX fuel gauge unit driver 2018-09-12 7:29 [PATCH 1/2] dt-bindings: power: Add Spreadtrum SC27XX fuel gauge unit documentation Baolin Wang @ 2018-09-12 7:29 ` Baolin Wang 2018-09-16 14:35 ` Sebastian Reichel 2018-09-16 13:57 ` [PATCH 1/2] dt-bindings: power: Add Spreadtrum SC27XX fuel gauge unit documentation Sebastian Reichel [not found] ` <20180917032625.GA25442@bogus> 2 siblings, 1 reply; 11+ messages in thread From: Baolin Wang @ 2018-09-12 7:29 UTC (permalink / raw) To: sre, robh+dt, mark.rutland Cc: linux-pm, devicetree, linux-kernel, yuanjiang.yu, baolin.wang, broonie This patch adds the Spreadtrum SC27XX serial PMICs fuel gauge support, which is used to calculate the battery capacity. Original-by: Yuanjiang Yu <yuanjiang.yu@unisoc.com> Signed-off-by: Baolin Wang <baolin.wang@linaro.org> --- drivers/power/supply/Kconfig | 7 + drivers/power/supply/Makefile | 1 + drivers/power/supply/sc27xx_fuel_gauge.c | 705 ++++++++++++++++++++++++++++++ 3 files changed, 713 insertions(+) create mode 100644 drivers/power/supply/sc27xx_fuel_gauge.c diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig index f27cf07..917f4b7 100644 --- a/drivers/power/supply/Kconfig +++ b/drivers/power/supply/Kconfig @@ -652,4 +652,11 @@ config CHARGER_SC2731 Say Y here to enable support for battery charging with SC2731 PMIC chips. +config FUEL_GAUGE_SC27XX + tristate "Spreadtrum SC27XX fuel gauge driver" + depends on MFD_SC27XX_PMIC || COMPILE_TEST + help + Say Y here to enable support for fuel gauge with SC27XX + PMIC chips. + endif # POWER_SUPPLY diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile index 767105b..b731c2a 100644 --- a/drivers/power/supply/Makefile +++ b/drivers/power/supply/Makefile @@ -86,3 +86,4 @@ obj-$(CONFIG_AXP288_FUEL_GAUGE) += axp288_fuel_gauge.o obj-$(CONFIG_AXP288_CHARGER) += axp288_charger.o obj-$(CONFIG_CHARGER_CROS_USBPD) += cros_usbpd-charger.o obj-$(CONFIG_CHARGER_SC2731) += sc2731_charger.o +obj-$(CONFIG_FUEL_GAUGE_SC27XX) += sc27xx_fuel_gauge.o diff --git a/drivers/power/supply/sc27xx_fuel_gauge.c b/drivers/power/supply/sc27xx_fuel_gauge.c new file mode 100644 index 0000000..4df0f47 --- /dev/null +++ b/drivers/power/supply/sc27xx_fuel_gauge.c @@ -0,0 +1,705 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2018 Spreadtrum Communications Inc. + +#include <linux/gpio/consumer.h> +#include <linux/iio/consumer.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/power_supply.h> +#include <linux/regmap.h> + +/* PMIC global control registers definition */ +#define SC27XX_MODULE_EN0 0xc08 +#define SC27XX_CLK_EN0 0xc18 +#define SC27XX_FGU_EN BIT(7) +#define SC27XX_FGU_RTC_EN BIT(6) + +/* FGU registers definition */ +#define SC27XX_FGU_START 0x0 +#define SC27XX_FGU_CONFIG 0x4 +#define SC27XX_FGU_ADC_CONFIG 0x8 +#define SC27XX_FGU_STATUS 0xc +#define SC27XX_FGU_INT_EN 0x10 +#define SC27XX_FGU_INT_CLR 0x14 +#define SC27XX_FGU_INT_STS 0x1c +#define SC27XX_FGU_VOLTAGE 0x20 +#define SC27XX_FGU_OCV 0x24 +#define SC27XX_FGU_POCV 0x28 +#define SC27XX_FGU_CURRENT 0x2c +#define SC27XX_FGU_CLBCNT_SETH 0x50 +#define SC27XX_FGU_CLBCNT_SETL 0x54 +#define SC27XX_FGU_CLBCNT_VALH 0x68 +#define SC27XX_FGU_CLBCNT_VALL 0x6c +#define SC27XX_FGU_CLBCNT_QMAXL 0x74 + +#define SC27XX_WRITE_SELCLB_EN BIT(0) +#define SC27XX_FGU_CLBCNT_MASK GENMASK(15, 0) +#define SC27XX_FGU_CLBCNT_SHIFT 16 + +#define SC27XX_FGU_1000MV_ADC 686 +#define SC27XX_FGU_1000MA_ADC 1372 +#define SC27XX_FGU_CUR_BASIC_ADC 8192 +#define SC27XX_FGU_SAMPLE_HZ 2 + +struct sc27xx_fgu_capacity_table { + int ocv; + int capacity; +}; + +/* + * struct sc27xx_fgu_data: describe the FGU device + * @regmap: regmap for register access + * @dev: platform device + * @battery: battery power supply + * @base: the base offset for the controller + * @lock: protect the structure + * @gpiod: GPIO for battery detection + * @channel: IIO channel to get battery temperature + * @inner_resist: the battery inner resistance in mOhm + * @total_cap: the total capacity of the battery in mAh + * @init_cap: the initial capacity of the battery in mAh + * @init_clbcnt: the initial coulomb counter + * @max_volt: the maximum constant input voltage in millivolt + * @table_len: the capacity table length + * @cap_table: capacity table with corresponding ocv + */ +struct sc27xx_fgu_data { + struct regmap *regmap; + struct device *dev; + struct power_supply *battery; + u32 base; + struct mutex lock; + struct gpio_desc *gpiod; + struct iio_channel *channel; + bool bat_present; + int inner_resist; + int total_cap; + int init_cap; + int init_clbcnt; + int max_volt; + int table_len; + struct sc27xx_fgu_capacity_table *cap_table; +}; + +static const char * const sc27xx_charger_supply_name[] = { + "sc2731_charger", + "sc2720_charger", + "sc2721_charger", + "sc2723_charger", +}; + +static int sc27xx_fgu_adc_to_current(int adc) +{ + return (adc * 1000) / SC27XX_FGU_1000MA_ADC; +} + +static int sc27xx_fgu_adc_to_voltage(int adc) +{ + return (adc * 1000) / SC27XX_FGU_1000MV_ADC; +} + +static int sc27xx_fgu_ocv_to_capacity(struct sc27xx_fgu_data *data, int ocv) +{ + struct sc27xx_fgu_capacity_table *tab = data->cap_table; + int n = data->table_len; + int i, cap, tmp; + + /* + * Find the position in the table for current battery OCV value, + * then use these two points to calculate battery capacity + * according to the linear method. + */ + for (i = 0; i < n; i++) + if (ocv > tab[i].ocv) + break; + + if (i > 0 && i < n) { + tmp = (tab[i - 1].capacity - tab[i].capacity) * + (ocv - tab[i].ocv) * 2; + tmp /= tab[i - 1].ocv - tab[i].ocv; + tmp = (tmp + 1) / 2; + cap = tmp + tab[i].capacity; + } else if (i == 0) { + cap = tab[0].capacity; + } else { + cap = tab[n - 1].capacity; + } + + return cap; +} + +/* + * When system boots on, we can not read battery capacity from coulomb + * registers, since now the coulomb registers are invalid. So we should + * calculate the battery open circuit voltage, and get current battery + * capacity according to the capacity table. + */ +static int sc27xx_fgu_get_boot_capacity(struct sc27xx_fgu_data *data, int *cap) +{ + int volt, cur, oci, ocv, ret; + + /* + * After system booting on, the SC27XX_FGU_CLBCNT_QMAXL register saved + * the first sampled open circuit current. + */ + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CLBCNT_QMAXL, + &cur); + if (ret) + return ret; + + cur <<= 1; + oci = sc27xx_fgu_adc_to_current(cur - SC27XX_FGU_CUR_BASIC_ADC); + + /* + * Should get the OCV from SC27XX_FGU_POCV register at the system + * beginning. It is ADC values reading from registers which need to + * convert the corresponding voltage. + */ + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_POCV, &volt); + if (ret) + return ret; + + volt = sc27xx_fgu_adc_to_voltage(volt); + ocv = volt - (oci * data->inner_resist) / 1000; + + /* + * Parse the capacity table to look up the correct capacity percent + * according to current battery's corresponding OCV values. + */ + *cap = sc27xx_fgu_ocv_to_capacity(data, ocv); + + return 0; +} + +static int sc27xx_fgu_set_clbcnt(struct sc27xx_fgu_data *data, int clbcnt) +{ + int ret; + + clbcnt *= SC27XX_FGU_SAMPLE_HZ; + + ret = regmap_update_bits(data->regmap, + data->base + SC27XX_FGU_CLBCNT_SETL, + SC27XX_FGU_CLBCNT_MASK, clbcnt); + if (ret) + return ret; + + ret = regmap_update_bits(data->regmap, + data->base + SC27XX_FGU_CLBCNT_SETH, + SC27XX_FGU_CLBCNT_MASK, + clbcnt >> SC27XX_FGU_CLBCNT_SHIFT); + if (ret) + return ret; + + return regmap_update_bits(data->regmap, data->base + SC27XX_FGU_START, + SC27XX_WRITE_SELCLB_EN, + SC27XX_WRITE_SELCLB_EN); +} + +static int sc27xx_fgu_get_clbcnt(struct sc27xx_fgu_data *data, int *clb_cnt) +{ + int ccl, cch, ret; + + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CLBCNT_VALL, + &ccl); + if (ret) + return ret; + + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CLBCNT_VALH, + &cch); + if (ret) + return ret; + + *clb_cnt = ccl & SC27XX_FGU_CLBCNT_MASK; + *clb_cnt |= (cch & SC27XX_FGU_CLBCNT_MASK) << SC27XX_FGU_CLBCNT_SHIFT; + *clb_cnt /= SC27XX_FGU_SAMPLE_HZ; + + return 0; +} + +static int sc27xx_fgu_get_capacity(struct sc27xx_fgu_data *data, int *cap) +{ + int ret, cur_clbcnt, delta_clbcnt, delta_cap, temp; + + /* Get current coulomb counters firstly */ + ret = sc27xx_fgu_get_clbcnt(data, &cur_clbcnt); + if (ret) + return ret; + + delta_clbcnt = cur_clbcnt - data->init_clbcnt; + + /* + * Convert coulomb counter to delta capacity (mAh), and set multiplier + * as 100 to improve the precision. + */ + temp = DIV_ROUND_CLOSEST(delta_clbcnt, 360); + temp = sc27xx_fgu_adc_to_current(temp); + + /* + * Convert to capacity percent of the battery total capacity, + * and multiplier is 100 too. + */ + delta_cap = DIV_ROUND_CLOSEST(temp * 100, data->total_cap); + *cap = delta_cap + data->init_cap; + + return 0; +} + +static int sc27xx_fgu_get_vbat_vol(struct sc27xx_fgu_data *data, int *val) +{ + int ret, vol; + + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_VOLTAGE, &vol); + if (ret) + return ret; + + /* + * It is ADC values reading from registers which need to convert to + * corresponding voltage values. + */ + *val = sc27xx_fgu_adc_to_voltage(vol); + + return 0; +} + +static int sc27xx_fgu_get_current(struct sc27xx_fgu_data *data, int *val) +{ + int ret, cur; + + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CURRENT, &cur); + if (ret) + return ret; + + /* + * It is ADC values reading from registers which need to convert to + * corresponding current values. + */ + *val = sc27xx_fgu_adc_to_current(cur - SC27XX_FGU_CUR_BASIC_ADC); + + return 0; +} + +static int sc27xx_fgu_get_vbat_ocv(struct sc27xx_fgu_data *data, int *val) +{ + int vol, cur, ret; + + ret = sc27xx_fgu_get_vbat_vol(data, &vol); + if (ret) + return ret; + + ret = sc27xx_fgu_get_current(data, &cur); + if (ret) + return ret; + + *val = vol - (cur * data->inner_resist) / 1000; + + return 0; +} + +static int sc27xx_fgu_get_temp(struct sc27xx_fgu_data *data, int *temp) +{ + return iio_read_channel_processed(data->channel, temp); +} + +static int sc27xx_fgu_get_health(struct sc27xx_fgu_data *data, int *health) +{ + int ret, vol; + + ret = sc27xx_fgu_get_vbat_vol(data, &vol); + if (ret) + return ret; + + if (vol > data->max_volt) + *health = POWER_SUPPLY_HEALTH_OVERVOLTAGE; + else + *health = POWER_SUPPLY_HEALTH_GOOD; + + return 0; +} + +static int sc27xx_fgu_get_status(struct sc27xx_fgu_data *data, int *status) +{ + union power_supply_propval val; + struct power_supply *psy; + int i, ret = -EINVAL; + + for (i = 0; i < ARRAY_SIZE(sc27xx_charger_supply_name); i++) { + psy = power_supply_get_by_name(sc27xx_charger_supply_name[i]); + if (!psy) + continue; + + ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_STATUS, + &val); + power_supply_put(psy); + if (ret) + return ret; + + *status = val.intval; + } + + return ret; +} + +static int sc27xx_fgu_get_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + struct sc27xx_fgu_data *data = power_supply_get_drvdata(psy); + int ret = 0; + int value; + + mutex_lock(&data->lock); + + switch (psp) { + case POWER_SUPPLY_PROP_STATUS: + ret = sc27xx_fgu_get_status(data, &value); + if (ret) + goto error; + + val->intval = value; + break; + + case POWER_SUPPLY_PROP_HEALTH: + ret = sc27xx_fgu_get_health(data, &value); + if (ret) + goto error; + + val->intval = value; + break; + + case POWER_SUPPLY_PROP_PRESENT: + val->intval = data->bat_present; + break; + + case POWER_SUPPLY_PROP_TEMP: + ret = sc27xx_fgu_get_temp(data, &value); + if (ret) + goto error; + + val->intval = value; + break; + + case POWER_SUPPLY_PROP_TECHNOLOGY: + val->intval = POWER_SUPPLY_TECHNOLOGY_LION; + break; + + case POWER_SUPPLY_PROP_CAPACITY: + ret = sc27xx_fgu_get_capacity(data, &value); + if (ret) + goto error; + + val->intval = value; + break; + + case POWER_SUPPLY_PROP_VOLTAGE_NOW: + ret = sc27xx_fgu_get_vbat_vol(data, &value); + if (ret) + goto error; + + val->intval = value * 1000; + break; + + case POWER_SUPPLY_PROP_VOLTAGE_OCV: + ret = sc27xx_fgu_get_vbat_ocv(data, &value); + if (ret) + goto error; + + val->intval = value * 1000; + break; + + case POWER_SUPPLY_PROP_CURRENT_NOW: + case POWER_SUPPLY_PROP_CURRENT_AVG: + ret = sc27xx_fgu_get_current(data, &value); + if (ret) + goto error; + + val->intval = value * 1000; + break; + + default: + ret = -EINVAL; + break; + } + +error: + mutex_unlock(&data->lock); + return ret; +} + +static void sc27xx_fgu_external_power_changed(struct power_supply *psy) +{ + struct sc27xx_fgu_data *data = power_supply_get_drvdata(psy); + + power_supply_changed(data->battery); +} + +static enum power_supply_property sc27xx_fgu_props[] = { + POWER_SUPPLY_PROP_STATUS, + POWER_SUPPLY_PROP_HEALTH, + POWER_SUPPLY_PROP_PRESENT, + POWER_SUPPLY_PROP_TEMP, + POWER_SUPPLY_PROP_TECHNOLOGY, + POWER_SUPPLY_PROP_CAPACITY, + POWER_SUPPLY_PROP_VOLTAGE_NOW, + POWER_SUPPLY_PROP_VOLTAGE_OCV, + POWER_SUPPLY_PROP_CURRENT_NOW, + POWER_SUPPLY_PROP_CURRENT_AVG, +}; + +static const struct power_supply_desc sc27xx_fgu_desc = { + .name = "sc27xx-fgu", + .type = POWER_SUPPLY_TYPE_BATTERY, + .properties = sc27xx_fgu_props, + .num_properties = ARRAY_SIZE(sc27xx_fgu_props), + .get_property = sc27xx_fgu_get_property, + .external_power_changed = sc27xx_fgu_external_power_changed, +}; + +static irqreturn_t sc27xx_fgu_bat_detection(int irq, void *dev_id) +{ + struct sc27xx_fgu_data *data = dev_id; + int state; + + mutex_lock(&data->lock); + + state = gpiod_get_value_cansleep(data->gpiod); + if (state < 0) { + dev_err(data->dev, "failed to get gpio state\n"); + mutex_unlock(&data->lock); + return IRQ_RETVAL(state); + } + + if (state) + data->bat_present = true; + else + data->bat_present = false; + + mutex_unlock(&data->lock); + + return IRQ_HANDLED; +} + +static void sc27xx_fgu_disable(void *_data) +{ + struct sc27xx_fgu_data *data = _data; + + regmap_update_bits(data->regmap, SC27XX_CLK_EN0, SC27XX_FGU_RTC_EN, 0); + regmap_update_bits(data->regmap, SC27XX_MODULE_EN0, SC27XX_FGU_EN, 0); +} + +static int sc27xx_fgu_cap_to_clbcnt(struct sc27xx_fgu_data *data, int capacity) +{ + /* + * Get current capacity (mAh) = battery total capacity (mAh) * + * current capacity percent (capacity / 100). + */ + int cur_cap = DIV_ROUND_CLOSEST(data->total_cap * capacity, 100); + + /* + * Convert current capacity (mAh) to coulomb counter according to the + * formula: 1 mAh =3.6 coulomb. + */ + return DIV_ROUND_CLOSEST(cur_cap * 36, 10); +} + +static int sc27xx_fgu_hw_init(struct sc27xx_fgu_data *data) +{ + struct power_supply_battery_info info = { }; + int ret; + + ret = power_supply_get_battery_info(data->battery, &info); + if (ret) { + dev_err(data->dev, "failed to get battery information\n"); + return ret; + } + + data->total_cap = info.charge_full_design_uah / 1000; + data->max_volt = info.constant_charge_voltage_max_uv / 1000; + + /* Enable the FGU module */ + ret = regmap_update_bits(data->regmap, SC27XX_MODULE_EN0, + SC27XX_FGU_EN, SC27XX_FGU_EN); + if (ret) { + dev_err(data->dev, "failed to enable fgu\n"); + return ret; + } + + /* Enable the FGU RTC clock to make it work */ + ret = regmap_update_bits(data->regmap, SC27XX_CLK_EN0, + SC27XX_FGU_RTC_EN, SC27XX_FGU_RTC_EN); + if (ret) { + dev_err(data->dev, "failed to enable fgu RTC clock\n"); + goto disable_fgu; + } + + /* + * Get the boot battery capacity when system powers on, which is used to + * initialize the coulomb counter. After that, we can read the coulomb + * counter to measure the battery capacity. + */ + ret = sc27xx_fgu_get_boot_capacity(data, &data->init_cap); + if (ret) { + dev_err(data->dev, "failed to get boot capacity\n"); + goto disable_clk; + } + + /* + * Convert battery capacity to the corresponding initial coulomb counter + * and set into coulomb counter registers. + */ + data->init_clbcnt = sc27xx_fgu_cap_to_clbcnt(data, data->init_cap); + ret = sc27xx_fgu_set_clbcnt(data, data->init_clbcnt); + if (ret) { + dev_err(data->dev, "failed to initialize coulomb counter\n"); + goto disable_clk; + } + + return 0; + +disable_clk: + regmap_update_bits(data->regmap, SC27XX_CLK_EN0, SC27XX_FGU_RTC_EN, 0); +disable_fgu: + regmap_update_bits(data->regmap, SC27XX_MODULE_EN0, SC27XX_FGU_EN, 0); + + return ret; +} + +static int sc27xx_fgu_parse_dt(struct sc27xx_fgu_data *data, + struct device_node *np) +{ + const __be32 *list; + int i, len, size, ret; + + ret = of_property_read_u32(np, "reg", &data->base); + if (ret) { + dev_err(data->dev, "failed to get fgu address\n"); + return ret; + } + + data->gpiod = devm_gpiod_get_optional(data->dev, "bat-detect", GPIOD_IN); + if (IS_ERR(data->gpiod)) { + dev_err(data->dev, "failed to get battery detection GPIO\n"); + return PTR_ERR(data->gpiod); + } + + data->channel = devm_iio_channel_get(data->dev, "bat-temp"); + if (IS_ERR(data->channel)) { + dev_err(data->dev, "failed to get IIO channel\n"); + return PTR_ERR(data->channel); + } + + /* Get the battery inner resistance */ + ret = of_property_read_u32(np, "sprd,inner-resist", &data->inner_resist); + if (ret) { + dev_err(data->dev, "failed to get battery inner resistance\n"); + return ret; + } + + /* Get battery ocv-capacity table */ + list = of_get_property(np, "sprd,ocv-cap-table", &size); + if (!list || !size) { + dev_err(data->dev, "failed to get ocv-capacity table\n"); + return -EINVAL; + } + + len = size / 8; + data->table_len = len; + data->cap_table = devm_kzalloc(data->dev, + sizeof(struct sc27xx_fgu_capacity_table) * len, + GFP_KERNEL); + if (!data->cap_table) + return -ENOMEM; + + for (i = 0; i < len; i++) { + data->cap_table[i].ocv = be32_to_cpu(*list++); + data->cap_table[i].capacity = be32_to_cpu(*list++); + } + + return 0; +} + +static int sc27xx_fgu_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct power_supply_config fgu_cfg = { }; + struct sc27xx_fgu_data *data; + int ret, irq; + + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->regmap = dev_get_regmap(pdev->dev.parent, NULL); + if (!data->regmap) { + dev_err(&pdev->dev, "failed to get regmap\n"); + return -ENODEV; + } + + mutex_init(&data->lock); + data->dev = &pdev->dev; + data->bat_present = true; + + ret = sc27xx_fgu_parse_dt(data, np); + if (ret) + return ret; + + fgu_cfg.drv_data = data; + fgu_cfg.of_node = np; + data->battery = devm_power_supply_register(&pdev->dev, &sc27xx_fgu_desc, + &fgu_cfg); + if (IS_ERR(data->battery)) { + dev_err(&pdev->dev, "failed to register power supply\n"); + return PTR_ERR(data->battery); + } + + ret = sc27xx_fgu_hw_init(data); + if (ret) { + dev_err(&pdev->dev, "failed to initialize fgu hardware\n"); + return ret; + } + + ret = devm_add_action(&pdev->dev, sc27xx_fgu_disable, data); + if (ret) { + sc27xx_fgu_disable(data); + dev_err(&pdev->dev, "failed to add fgu disable action\n"); + return ret; + } + + irq = gpiod_to_irq(data->gpiod); + if (irq < 0) { + dev_err(&pdev->dev, "failed to translate GPIO to IRQ\n"); + return irq; + } + + ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, + sc27xx_fgu_bat_detection, + IRQF_ONESHOT | IRQF_TRIGGER_RISING | + IRQF_TRIGGER_FALLING, + pdev->name, data); + if (ret) { + dev_err(&pdev->dev, "failed to request IRQ\n"); + return ret; + } + + return 0; +} + +static const struct of_device_id sc27xx_fgu_of_match[] = { + { .compatible = "sprd,sc2731-fgu", }, + { } +}; + +static struct platform_driver sc27xx_fgu_driver = { + .probe = sc27xx_fgu_probe, + .driver = { + .name = "sc27xx-fgu", + .of_match_table = sc27xx_fgu_of_match, + } +}; + +module_platform_driver(sc27xx_fgu_driver); + +MODULE_DESCRIPTION("Spreadtrum SC27XX PMICs Fual Gauge Unit Driver"); +MODULE_LICENSE("GPL v2"); -- 1.7.9.5 ^ permalink raw reply related [flat|nested] 11+ messages in thread
* Re: [PATCH 2/2] power: supply: Add Spreadtrum SC27XX fuel gauge unit driver 2018-09-12 7:29 ` [PATCH 2/2] power: supply: Add Spreadtrum SC27XX fuel gauge unit driver Baolin Wang @ 2018-09-16 14:35 ` Sebastian Reichel 2018-09-17 4:01 ` Baolin Wang 0 siblings, 1 reply; 11+ messages in thread From: Sebastian Reichel @ 2018-09-16 14:35 UTC (permalink / raw) To: Baolin Wang Cc: robh+dt, mark.rutland, linux-pm, devicetree, linux-kernel, yuanjiang.yu, broonie [-- Attachment #1: Type: text/plain, Size: 22362 bytes --] Hi, Looks mostly good. I have a couple of comments in addition to the ones from the binding about using battery_info for the OCV -> capacity mapping. On Wed, Sep 12, 2018 at 03:29:39PM +0800, Baolin Wang wrote: > This patch adds the Spreadtrum SC27XX serial PMICs fuel gauge support, > which is used to calculate the battery capacity. > > Original-by: Yuanjiang Yu <yuanjiang.yu@unisoc.com> > Signed-off-by: Baolin Wang <baolin.wang@linaro.org> > --- > drivers/power/supply/Kconfig | 7 + > drivers/power/supply/Makefile | 1 + > drivers/power/supply/sc27xx_fuel_gauge.c | 705 ++++++++++++++++++++++++++++++ > 3 files changed, 713 insertions(+) > create mode 100644 drivers/power/supply/sc27xx_fuel_gauge.c > > diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig > index f27cf07..917f4b7 100644 > --- a/drivers/power/supply/Kconfig > +++ b/drivers/power/supply/Kconfig > @@ -652,4 +652,11 @@ config CHARGER_SC2731 > Say Y here to enable support for battery charging with SC2731 > PMIC chips. > > +config FUEL_GAUGE_SC27XX > + tristate "Spreadtrum SC27XX fuel gauge driver" > + depends on MFD_SC27XX_PMIC || COMPILE_TEST > + help > + Say Y here to enable support for fuel gauge with SC27XX > + PMIC chips. > + > endif # POWER_SUPPLY > diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile > index 767105b..b731c2a 100644 > --- a/drivers/power/supply/Makefile > +++ b/drivers/power/supply/Makefile > @@ -86,3 +86,4 @@ obj-$(CONFIG_AXP288_FUEL_GAUGE) += axp288_fuel_gauge.o > obj-$(CONFIG_AXP288_CHARGER) += axp288_charger.o > obj-$(CONFIG_CHARGER_CROS_USBPD) += cros_usbpd-charger.o > obj-$(CONFIG_CHARGER_SC2731) += sc2731_charger.o > +obj-$(CONFIG_FUEL_GAUGE_SC27XX) += sc27xx_fuel_gauge.o > diff --git a/drivers/power/supply/sc27xx_fuel_gauge.c b/drivers/power/supply/sc27xx_fuel_gauge.c > new file mode 100644 > index 0000000..4df0f47 > --- /dev/null > +++ b/drivers/power/supply/sc27xx_fuel_gauge.c > @@ -0,0 +1,705 @@ > +// SPDX-License-Identifier: GPL-2.0 > +// Copyright (C) 2018 Spreadtrum Communications Inc. > + > +#include <linux/gpio/consumer.h> > +#include <linux/iio/consumer.h> > +#include <linux/interrupt.h> > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/of.h> > +#include <linux/platform_device.h> > +#include <linux/power_supply.h> > +#include <linux/regmap.h> > + > +/* PMIC global control registers definition */ > +#define SC27XX_MODULE_EN0 0xc08 > +#define SC27XX_CLK_EN0 0xc18 > +#define SC27XX_FGU_EN BIT(7) > +#define SC27XX_FGU_RTC_EN BIT(6) > + > +/* FGU registers definition */ > +#define SC27XX_FGU_START 0x0 > +#define SC27XX_FGU_CONFIG 0x4 > +#define SC27XX_FGU_ADC_CONFIG 0x8 > +#define SC27XX_FGU_STATUS 0xc > +#define SC27XX_FGU_INT_EN 0x10 > +#define SC27XX_FGU_INT_CLR 0x14 > +#define SC27XX_FGU_INT_STS 0x1c > +#define SC27XX_FGU_VOLTAGE 0x20 > +#define SC27XX_FGU_OCV 0x24 > +#define SC27XX_FGU_POCV 0x28 > +#define SC27XX_FGU_CURRENT 0x2c > +#define SC27XX_FGU_CLBCNT_SETH 0x50 > +#define SC27XX_FGU_CLBCNT_SETL 0x54 > +#define SC27XX_FGU_CLBCNT_VALH 0x68 > +#define SC27XX_FGU_CLBCNT_VALL 0x6c > +#define SC27XX_FGU_CLBCNT_QMAXL 0x74 > + > +#define SC27XX_WRITE_SELCLB_EN BIT(0) > +#define SC27XX_FGU_CLBCNT_MASK GENMASK(15, 0) > +#define SC27XX_FGU_CLBCNT_SHIFT 16 > + > +#define SC27XX_FGU_1000MV_ADC 686 > +#define SC27XX_FGU_1000MA_ADC 1372 > +#define SC27XX_FGU_CUR_BASIC_ADC 8192 > +#define SC27XX_FGU_SAMPLE_HZ 2 > + > +struct sc27xx_fgu_capacity_table { > + int ocv; > + int capacity; > +}; > + > +/* > + * struct sc27xx_fgu_data: describe the FGU device > + * @regmap: regmap for register access > + * @dev: platform device > + * @battery: battery power supply > + * @base: the base offset for the controller > + * @lock: protect the structure > + * @gpiod: GPIO for battery detection > + * @channel: IIO channel to get battery temperature > + * @inner_resist: the battery inner resistance in mOhm > + * @total_cap: the total capacity of the battery in mAh > + * @init_cap: the initial capacity of the battery in mAh > + * @init_clbcnt: the initial coulomb counter > + * @max_volt: the maximum constant input voltage in millivolt > + * @table_len: the capacity table length > + * @cap_table: capacity table with corresponding ocv > + */ > +struct sc27xx_fgu_data { > + struct regmap *regmap; > + struct device *dev; > + struct power_supply *battery; > + u32 base; > + struct mutex lock; > + struct gpio_desc *gpiod; > + struct iio_channel *channel; > + bool bat_present; > + int inner_resist; > + int total_cap; > + int init_cap; > + int init_clbcnt; > + int max_volt; > + int table_len; > + struct sc27xx_fgu_capacity_table *cap_table; > +}; > + > +static const char * const sc27xx_charger_supply_name[] = { > + "sc2731_charger", > + "sc2720_charger", > + "sc2721_charger", > + "sc2723_charger", > +}; > + > +static int sc27xx_fgu_adc_to_current(int adc) > +{ > + return (adc * 1000) / SC27XX_FGU_1000MA_ADC; > +} > + > +static int sc27xx_fgu_adc_to_voltage(int adc) > +{ > + return (adc * 1000) / SC27XX_FGU_1000MV_ADC; > +} > + > +static int sc27xx_fgu_ocv_to_capacity(struct sc27xx_fgu_data *data, int ocv) > +{ > + struct sc27xx_fgu_capacity_table *tab = data->cap_table; > + int n = data->table_len; > + int i, cap, tmp; > + > + /* > + * Find the position in the table for current battery OCV value, > + * then use these two points to calculate battery capacity > + * according to the linear method. > + */ > + for (i = 0; i < n; i++) > + if (ocv > tab[i].ocv) > + break; > + > + if (i > 0 && i < n) { > + tmp = (tab[i - 1].capacity - tab[i].capacity) * > + (ocv - tab[i].ocv) * 2; > + tmp /= tab[i - 1].ocv - tab[i].ocv; > + tmp = (tmp + 1) / 2; > + cap = tmp + tab[i].capacity; > + } else if (i == 0) { > + cap = tab[0].capacity; > + } else { > + cap = tab[n - 1].capacity; > + } > + > + return cap; > +} > + > +/* > + * When system boots on, we can not read battery capacity from coulomb > + * registers, since now the coulomb registers are invalid. So we should > + * calculate the battery open circuit voltage, and get current battery > + * capacity according to the capacity table. > + */ > +static int sc27xx_fgu_get_boot_capacity(struct sc27xx_fgu_data *data, int *cap) > +{ > + int volt, cur, oci, ocv, ret; > + > + /* > + * After system booting on, the SC27XX_FGU_CLBCNT_QMAXL register saved > + * the first sampled open circuit current. > + */ > + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CLBCNT_QMAXL, > + &cur); > + if (ret) > + return ret; > + > + cur <<= 1; > + oci = sc27xx_fgu_adc_to_current(cur - SC27XX_FGU_CUR_BASIC_ADC); > + > + /* > + * Should get the OCV from SC27XX_FGU_POCV register at the system > + * beginning. It is ADC values reading from registers which need to > + * convert the corresponding voltage. > + */ > + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_POCV, &volt); > + if (ret) > + return ret; > + > + volt = sc27xx_fgu_adc_to_voltage(volt); > + ocv = volt - (oci * data->inner_resist) / 1000; > + > + /* > + * Parse the capacity table to look up the correct capacity percent > + * according to current battery's corresponding OCV values. > + */ > + *cap = sc27xx_fgu_ocv_to_capacity(data, ocv); > + > + return 0; > +} > + > +static int sc27xx_fgu_set_clbcnt(struct sc27xx_fgu_data *data, int clbcnt) > +{ > + int ret; > + > + clbcnt *= SC27XX_FGU_SAMPLE_HZ; > + > + ret = regmap_update_bits(data->regmap, > + data->base + SC27XX_FGU_CLBCNT_SETL, > + SC27XX_FGU_CLBCNT_MASK, clbcnt); > + if (ret) > + return ret; > + > + ret = regmap_update_bits(data->regmap, > + data->base + SC27XX_FGU_CLBCNT_SETH, > + SC27XX_FGU_CLBCNT_MASK, > + clbcnt >> SC27XX_FGU_CLBCNT_SHIFT); > + if (ret) > + return ret; > + > + return regmap_update_bits(data->regmap, data->base + SC27XX_FGU_START, > + SC27XX_WRITE_SELCLB_EN, > + SC27XX_WRITE_SELCLB_EN); > +} > + > +static int sc27xx_fgu_get_clbcnt(struct sc27xx_fgu_data *data, int *clb_cnt) > +{ > + int ccl, cch, ret; > + > + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CLBCNT_VALL, > + &ccl); > + if (ret) > + return ret; > + > + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CLBCNT_VALH, > + &cch); > + if (ret) > + return ret; > + > + *clb_cnt = ccl & SC27XX_FGU_CLBCNT_MASK; > + *clb_cnt |= (cch & SC27XX_FGU_CLBCNT_MASK) << SC27XX_FGU_CLBCNT_SHIFT; > + *clb_cnt /= SC27XX_FGU_SAMPLE_HZ; > + > + return 0; > +} > + > +static int sc27xx_fgu_get_capacity(struct sc27xx_fgu_data *data, int *cap) > +{ > + int ret, cur_clbcnt, delta_clbcnt, delta_cap, temp; > + > + /* Get current coulomb counters firstly */ > + ret = sc27xx_fgu_get_clbcnt(data, &cur_clbcnt); > + if (ret) > + return ret; > + > + delta_clbcnt = cur_clbcnt - data->init_clbcnt; > + > + /* > + * Convert coulomb counter to delta capacity (mAh), and set multiplier > + * as 100 to improve the precision. > + */ > + temp = DIV_ROUND_CLOSEST(delta_clbcnt, 360); > + temp = sc27xx_fgu_adc_to_current(temp); > + > + /* > + * Convert to capacity percent of the battery total capacity, > + * and multiplier is 100 too. > + */ > + delta_cap = DIV_ROUND_CLOSEST(temp * 100, data->total_cap); > + *cap = delta_cap + data->init_cap; > + > + return 0; > +} > + > +static int sc27xx_fgu_get_vbat_vol(struct sc27xx_fgu_data *data, int *val) > +{ > + int ret, vol; > + > + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_VOLTAGE, &vol); > + if (ret) > + return ret; > + > + /* > + * It is ADC values reading from registers which need to convert to > + * corresponding voltage values. > + */ > + *val = sc27xx_fgu_adc_to_voltage(vol); > + > + return 0; > +} > + > +static int sc27xx_fgu_get_current(struct sc27xx_fgu_data *data, int *val) > +{ > + int ret, cur; > + > + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CURRENT, &cur); > + if (ret) > + return ret; > + > + /* > + * It is ADC values reading from registers which need to convert to > + * corresponding current values. > + */ > + *val = sc27xx_fgu_adc_to_current(cur - SC27XX_FGU_CUR_BASIC_ADC); > + > + return 0; > +} > + > +static int sc27xx_fgu_get_vbat_ocv(struct sc27xx_fgu_data *data, int *val) > +{ > + int vol, cur, ret; > + > + ret = sc27xx_fgu_get_vbat_vol(data, &vol); > + if (ret) > + return ret; > + > + ret = sc27xx_fgu_get_current(data, &cur); > + if (ret) > + return ret; > + > + *val = vol - (cur * data->inner_resist) / 1000; You multiply this with 1000 directly after this function to get back to uV. Just drop the division and the multiplication. > + > + return 0; > +} > + > +static int sc27xx_fgu_get_temp(struct sc27xx_fgu_data *data, int *temp) > +{ > + return iio_read_channel_processed(data->channel, temp); > +} > + > +static int sc27xx_fgu_get_health(struct sc27xx_fgu_data *data, int *health) > +{ > + int ret, vol; > + > + ret = sc27xx_fgu_get_vbat_vol(data, &vol); > + if (ret) > + return ret; > + > + if (vol > data->max_volt) > + *health = POWER_SUPPLY_HEALTH_OVERVOLTAGE; > + else > + *health = POWER_SUPPLY_HEALTH_GOOD; > + > + return 0; > +} > + > +static int sc27xx_fgu_get_status(struct sc27xx_fgu_data *data, int *status) > +{ > + union power_supply_propval val; > + struct power_supply *psy; > + int i, ret = -EINVAL; > + > + for (i = 0; i < ARRAY_SIZE(sc27xx_charger_supply_name); i++) { > + psy = power_supply_get_by_name(sc27xx_charger_supply_name[i]); > + if (!psy) > + continue; > + > + ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_STATUS, > + &val); > + power_supply_put(psy); > + if (ret) > + return ret; > + > + *status = val.intval; > + } > + > + return ret; > +} > + > +static int sc27xx_fgu_get_property(struct power_supply *psy, > + enum power_supply_property psp, > + union power_supply_propval *val) > +{ > + struct sc27xx_fgu_data *data = power_supply_get_drvdata(psy); > + int ret = 0; > + int value; > + > + mutex_lock(&data->lock); > + > + switch (psp) { > + case POWER_SUPPLY_PROP_STATUS: > + ret = sc27xx_fgu_get_status(data, &value); > + if (ret) > + goto error; > + > + val->intval = value; > + break; > + > + case POWER_SUPPLY_PROP_HEALTH: > + ret = sc27xx_fgu_get_health(data, &value); > + if (ret) > + goto error; > + > + val->intval = value; > + break; > + > + case POWER_SUPPLY_PROP_PRESENT: > + val->intval = data->bat_present; > + break; > + > + case POWER_SUPPLY_PROP_TEMP: > + ret = sc27xx_fgu_get_temp(data, &value); > + if (ret) > + goto error; > + > + val->intval = value; > + break; > + > + case POWER_SUPPLY_PROP_TECHNOLOGY: > + val->intval = POWER_SUPPLY_TECHNOLOGY_LION; > + break; > + > + case POWER_SUPPLY_PROP_CAPACITY: > + ret = sc27xx_fgu_get_capacity(data, &value); > + if (ret) > + goto error; > + > + val->intval = value; > + break; > + > + case POWER_SUPPLY_PROP_VOLTAGE_NOW: > + ret = sc27xx_fgu_get_vbat_vol(data, &value); > + if (ret) > + goto error; > + > + val->intval = value * 1000; > + break; > + > + case POWER_SUPPLY_PROP_VOLTAGE_OCV: > + ret = sc27xx_fgu_get_vbat_ocv(data, &value); > + if (ret) > + goto error; > + > + val->intval = value * 1000; > + break; > + > + case POWER_SUPPLY_PROP_CURRENT_NOW: > + case POWER_SUPPLY_PROP_CURRENT_AVG: > + ret = sc27xx_fgu_get_current(data, &value); > + if (ret) > + goto error; > + > + val->intval = value * 1000; > + break; > + > + default: > + ret = -EINVAL; > + break; > + } > + > +error: > + mutex_unlock(&data->lock); > + return ret; > +} > + > +static void sc27xx_fgu_external_power_changed(struct power_supply *psy) > +{ > + struct sc27xx_fgu_data *data = power_supply_get_drvdata(psy); > + > + power_supply_changed(data->battery); > +} > + > +static enum power_supply_property sc27xx_fgu_props[] = { > + POWER_SUPPLY_PROP_STATUS, > + POWER_SUPPLY_PROP_HEALTH, > + POWER_SUPPLY_PROP_PRESENT, > + POWER_SUPPLY_PROP_TEMP, > + POWER_SUPPLY_PROP_TECHNOLOGY, > + POWER_SUPPLY_PROP_CAPACITY, > + POWER_SUPPLY_PROP_VOLTAGE_NOW, > + POWER_SUPPLY_PROP_VOLTAGE_OCV, > + POWER_SUPPLY_PROP_CURRENT_NOW, > + POWER_SUPPLY_PROP_CURRENT_AVG, > +}; > + > +static const struct power_supply_desc sc27xx_fgu_desc = { > + .name = "sc27xx-fgu", > + .type = POWER_SUPPLY_TYPE_BATTERY, > + .properties = sc27xx_fgu_props, > + .num_properties = ARRAY_SIZE(sc27xx_fgu_props), > + .get_property = sc27xx_fgu_get_property, > + .external_power_changed = sc27xx_fgu_external_power_changed, > +}; > + > +static irqreturn_t sc27xx_fgu_bat_detection(int irq, void *dev_id) > +{ > + struct sc27xx_fgu_data *data = dev_id; > + int state; > + > + mutex_lock(&data->lock); > + > + state = gpiod_get_value_cansleep(data->gpiod); > + if (state < 0) { > + dev_err(data->dev, "failed to get gpio state\n"); > + mutex_unlock(&data->lock); > + return IRQ_RETVAL(state); > + } > + > + if (state) > + data->bat_present = true; > + else > + data->bat_present = false; > + > + mutex_unlock(&data->lock); You want to call power_supply_changed() here. > + return IRQ_HANDLED; > +} > + > +static void sc27xx_fgu_disable(void *_data) > +{ > + struct sc27xx_fgu_data *data = _data; > + > + regmap_update_bits(data->regmap, SC27XX_CLK_EN0, SC27XX_FGU_RTC_EN, 0); > + regmap_update_bits(data->regmap, SC27XX_MODULE_EN0, SC27XX_FGU_EN, 0); > +} > + > +static int sc27xx_fgu_cap_to_clbcnt(struct sc27xx_fgu_data *data, int capacity) > +{ > + /* > + * Get current capacity (mAh) = battery total capacity (mAh) * > + * current capacity percent (capacity / 100). > + */ > + int cur_cap = DIV_ROUND_CLOSEST(data->total_cap * capacity, 100); > + > + /* > + * Convert current capacity (mAh) to coulomb counter according to the > + * formula: 1 mAh =3.6 coulomb. > + */ > + return DIV_ROUND_CLOSEST(cur_cap * 36, 10); > +} > + > +static int sc27xx_fgu_hw_init(struct sc27xx_fgu_data *data) > +{ > + struct power_supply_battery_info info = { }; > + int ret; > + > + ret = power_supply_get_battery_info(data->battery, &info); > + if (ret) { > + dev_err(data->dev, "failed to get battery information\n"); > + return ret; > + } > + > + data->total_cap = info.charge_full_design_uah / 1000; > + data->max_volt = info.constant_charge_voltage_max_uv / 1000; > + > + /* Enable the FGU module */ > + ret = regmap_update_bits(data->regmap, SC27XX_MODULE_EN0, > + SC27XX_FGU_EN, SC27XX_FGU_EN); > + if (ret) { > + dev_err(data->dev, "failed to enable fgu\n"); > + return ret; > + } > + > + /* Enable the FGU RTC clock to make it work */ > + ret = regmap_update_bits(data->regmap, SC27XX_CLK_EN0, > + SC27XX_FGU_RTC_EN, SC27XX_FGU_RTC_EN); > + if (ret) { > + dev_err(data->dev, "failed to enable fgu RTC clock\n"); > + goto disable_fgu; > + } > + > + /* > + * Get the boot battery capacity when system powers on, which is used to > + * initialize the coulomb counter. After that, we can read the coulomb > + * counter to measure the battery capacity. > + */ > + ret = sc27xx_fgu_get_boot_capacity(data, &data->init_cap); > + if (ret) { > + dev_err(data->dev, "failed to get boot capacity\n"); > + goto disable_clk; > + } > + > + /* > + * Convert battery capacity to the corresponding initial coulomb counter > + * and set into coulomb counter registers. > + */ > + data->init_clbcnt = sc27xx_fgu_cap_to_clbcnt(data, data->init_cap); > + ret = sc27xx_fgu_set_clbcnt(data, data->init_clbcnt); > + if (ret) { > + dev_err(data->dev, "failed to initialize coulomb counter\n"); > + goto disable_clk; > + } > + > + return 0; > + > +disable_clk: > + regmap_update_bits(data->regmap, SC27XX_CLK_EN0, SC27XX_FGU_RTC_EN, 0); > +disable_fgu: > + regmap_update_bits(data->regmap, SC27XX_MODULE_EN0, SC27XX_FGU_EN, 0); > + > + return ret; > +} > + > +static int sc27xx_fgu_parse_dt(struct sc27xx_fgu_data *data, > + struct device_node *np) > +{ > + const __be32 *list; > + int i, len, size, ret; > + > + ret = of_property_read_u32(np, "reg", &data->base); > + if (ret) { > + dev_err(data->dev, "failed to get fgu address\n"); > + return ret; > + } > + > + data->gpiod = devm_gpiod_get_optional(data->dev, "bat-detect", GPIOD_IN); > + if (IS_ERR(data->gpiod)) { > + dev_err(data->dev, "failed to get battery detection GPIO\n"); > + return PTR_ERR(data->gpiod); > + } According to the binding (and the remaining code!) this gpio is not optional. -- Sebastian > + data->channel = devm_iio_channel_get(data->dev, "bat-temp"); > + if (IS_ERR(data->channel)) { > + dev_err(data->dev, "failed to get IIO channel\n"); > + return PTR_ERR(data->channel); > + } > + > + /* Get the battery inner resistance */ > + ret = of_property_read_u32(np, "sprd,inner-resist", &data->inner_resist); > + if (ret) { > + dev_err(data->dev, "failed to get battery inner resistance\n"); > + return ret; > + } > + > + /* Get battery ocv-capacity table */ > + list = of_get_property(np, "sprd,ocv-cap-table", &size); > + if (!list || !size) { > + dev_err(data->dev, "failed to get ocv-capacity table\n"); > + return -EINVAL; > + } > + > + len = size / 8; > + data->table_len = len; > + data->cap_table = devm_kzalloc(data->dev, > + sizeof(struct sc27xx_fgu_capacity_table) * len, > + GFP_KERNEL); > + if (!data->cap_table) > + return -ENOMEM; > + > + for (i = 0; i < len; i++) { > + data->cap_table[i].ocv = be32_to_cpu(*list++); > + data->cap_table[i].capacity = be32_to_cpu(*list++); > + } > + > + return 0; > +} > + > +static int sc27xx_fgu_probe(struct platform_device *pdev) > +{ > + struct device_node *np = pdev->dev.of_node; > + struct power_supply_config fgu_cfg = { }; > + struct sc27xx_fgu_data *data; > + int ret, irq; > + > + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); > + if (!data) > + return -ENOMEM; > + > + data->regmap = dev_get_regmap(pdev->dev.parent, NULL); > + if (!data->regmap) { > + dev_err(&pdev->dev, "failed to get regmap\n"); > + return -ENODEV; > + } > + > + mutex_init(&data->lock); > + data->dev = &pdev->dev; > + data->bat_present = true; > + > + ret = sc27xx_fgu_parse_dt(data, np); > + if (ret) > + return ret; > + > + fgu_cfg.drv_data = data; > + fgu_cfg.of_node = np; > + data->battery = devm_power_supply_register(&pdev->dev, &sc27xx_fgu_desc, > + &fgu_cfg); > + if (IS_ERR(data->battery)) { > + dev_err(&pdev->dev, "failed to register power supply\n"); > + return PTR_ERR(data->battery); > + } > + > + ret = sc27xx_fgu_hw_init(data); > + if (ret) { > + dev_err(&pdev->dev, "failed to initialize fgu hardware\n"); > + return ret; > + } > + > + ret = devm_add_action(&pdev->dev, sc27xx_fgu_disable, data); > + if (ret) { > + sc27xx_fgu_disable(data); > + dev_err(&pdev->dev, "failed to add fgu disable action\n"); > + return ret; > + } > + > + irq = gpiod_to_irq(data->gpiod); > + if (irq < 0) { > + dev_err(&pdev->dev, "failed to translate GPIO to IRQ\n"); > + return irq; > + } > + > + ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, > + sc27xx_fgu_bat_detection, > + IRQF_ONESHOT | IRQF_TRIGGER_RISING | > + IRQF_TRIGGER_FALLING, > + pdev->name, data); > + if (ret) { > + dev_err(&pdev->dev, "failed to request IRQ\n"); > + return ret; > + } > + > + return 0; > +} > + > +static const struct of_device_id sc27xx_fgu_of_match[] = { > + { .compatible = "sprd,sc2731-fgu", }, > + { } > +}; > + > +static struct platform_driver sc27xx_fgu_driver = { > + .probe = sc27xx_fgu_probe, > + .driver = { > + .name = "sc27xx-fgu", > + .of_match_table = sc27xx_fgu_of_match, > + } > +}; > + > +module_platform_driver(sc27xx_fgu_driver); > + > +MODULE_DESCRIPTION("Spreadtrum SC27XX PMICs Fual Gauge Unit Driver"); > +MODULE_LICENSE("GPL v2"); > -- > 1.7.9.5 > [-- Attachment #2: signature.asc --] [-- Type: application/pgp-signature, Size: 833 bytes --] ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 2/2] power: supply: Add Spreadtrum SC27XX fuel gauge unit driver 2018-09-16 14:35 ` Sebastian Reichel @ 2018-09-17 4:01 ` Baolin Wang 2018-09-20 0:36 ` Sebastian Reichel 0 siblings, 1 reply; 11+ messages in thread From: Baolin Wang @ 2018-09-17 4:01 UTC (permalink / raw) To: Sebastian Reichel Cc: Rob Herring, Mark Rutland, Linux PM list, DTML, LKML, yuanjiang.yu, Mark Brown Hi Sebastian, On 16 September 2018 at 22:35, Sebastian Reichel <sebastian.reichel@collabora.com> wrote: > Hi, > > Looks mostly good. I have a couple of comments in addition to the > ones from the binding about using battery_info for the OCV -> > capacity mapping. OK. >> + >> +static int sc27xx_fgu_get_vbat_vol(struct sc27xx_fgu_data *data, int *val) >> +{ >> + int ret, vol; >> + >> + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_VOLTAGE, &vol); >> + if (ret) >> + return ret; >> + >> + /* >> + * It is ADC values reading from registers which need to convert to >> + * corresponding voltage values. >> + */ >> + *val = sc27xx_fgu_adc_to_voltage(vol); >> + >> + return 0; >> +} >> + >> +static int sc27xx_fgu_get_current(struct sc27xx_fgu_data *data, int *val) >> +{ >> + int ret, cur; >> + >> + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CURRENT, &cur); >> + if (ret) >> + return ret; >> + >> + /* >> + * It is ADC values reading from registers which need to convert to >> + * corresponding current values. >> + */ >> + *val = sc27xx_fgu_adc_to_current(cur - SC27XX_FGU_CUR_BASIC_ADC); >> + >> + return 0; >> +} >> + >> +static int sc27xx_fgu_get_vbat_ocv(struct sc27xx_fgu_data *data, int *val) >> +{ >> + int vol, cur, ret; >> + >> + ret = sc27xx_fgu_get_vbat_vol(data, &vol); >> + if (ret) >> + return ret; >> + >> + ret = sc27xx_fgu_get_current(data, &cur); >> + if (ret) >> + return ret; >> + >> + *val = vol - (cur * data->inner_resist) / 1000; > > You multiply this with 1000 directly after this function to get back > to uV. Just drop the division and the multiplication. But the vol's unit is mV, so I can change to: *val = vol * 1000 - cur * data->inner_resist; >> + >> + return 0; >> +} >> + >> +static int sc27xx_fgu_get_temp(struct sc27xx_fgu_data *data, int *temp) >> +{ >> + return iio_read_channel_processed(data->channel, temp); >> +} >> + >> +static int sc27xx_fgu_get_health(struct sc27xx_fgu_data *data, int *health) >> +{ >> + int ret, vol; >> + >> + ret = sc27xx_fgu_get_vbat_vol(data, &vol); >> + if (ret) >> + return ret; >> + >> + if (vol > data->max_volt) >> + *health = POWER_SUPPLY_HEALTH_OVERVOLTAGE; >> + else >> + *health = POWER_SUPPLY_HEALTH_GOOD; >> + >> + return 0; >> +} >> + >> +static int sc27xx_fgu_get_status(struct sc27xx_fgu_data *data, int *status) >> +{ >> + union power_supply_propval val; >> + struct power_supply *psy; >> + int i, ret = -EINVAL; >> + >> + for (i = 0; i < ARRAY_SIZE(sc27xx_charger_supply_name); i++) { >> + psy = power_supply_get_by_name(sc27xx_charger_supply_name[i]); >> + if (!psy) >> + continue; >> + >> + ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_STATUS, >> + &val); >> + power_supply_put(psy); >> + if (ret) >> + return ret; >> + >> + *status = val.intval; >> + } >> + >> + return ret; >> +} >> + >> +static int sc27xx_fgu_get_property(struct power_supply *psy, >> + enum power_supply_property psp, >> + union power_supply_propval *val) >> +{ >> + struct sc27xx_fgu_data *data = power_supply_get_drvdata(psy); >> + int ret = 0; >> + int value; >> + >> + mutex_lock(&data->lock); >> + >> + switch (psp) { >> + case POWER_SUPPLY_PROP_STATUS: >> + ret = sc27xx_fgu_get_status(data, &value); >> + if (ret) >> + goto error; >> + >> + val->intval = value; >> + break; >> + >> + case POWER_SUPPLY_PROP_HEALTH: >> + ret = sc27xx_fgu_get_health(data, &value); >> + if (ret) >> + goto error; >> + >> + val->intval = value; >> + break; >> + >> + case POWER_SUPPLY_PROP_PRESENT: >> + val->intval = data->bat_present; >> + break; >> + >> + case POWER_SUPPLY_PROP_TEMP: >> + ret = sc27xx_fgu_get_temp(data, &value); >> + if (ret) >> + goto error; >> + >> + val->intval = value; >> + break; >> + >> + case POWER_SUPPLY_PROP_TECHNOLOGY: >> + val->intval = POWER_SUPPLY_TECHNOLOGY_LION; >> + break; >> + >> + case POWER_SUPPLY_PROP_CAPACITY: >> + ret = sc27xx_fgu_get_capacity(data, &value); >> + if (ret) >> + goto error; >> + >> + val->intval = value; >> + break; >> + >> + case POWER_SUPPLY_PROP_VOLTAGE_NOW: >> + ret = sc27xx_fgu_get_vbat_vol(data, &value); >> + if (ret) >> + goto error; >> + >> + val->intval = value * 1000; >> + break; >> + >> + case POWER_SUPPLY_PROP_VOLTAGE_OCV: >> + ret = sc27xx_fgu_get_vbat_ocv(data, &value); >> + if (ret) >> + goto error; >> + >> + val->intval = value * 1000; >> + break; >> + >> + case POWER_SUPPLY_PROP_CURRENT_NOW: >> + case POWER_SUPPLY_PROP_CURRENT_AVG: >> + ret = sc27xx_fgu_get_current(data, &value); >> + if (ret) >> + goto error; >> + >> + val->intval = value * 1000; >> + break; >> + >> + default: >> + ret = -EINVAL; >> + break; >> + } >> + >> +error: >> + mutex_unlock(&data->lock); >> + return ret; >> +} >> + >> +static void sc27xx_fgu_external_power_changed(struct power_supply *psy) >> +{ >> + struct sc27xx_fgu_data *data = power_supply_get_drvdata(psy); >> + >> + power_supply_changed(data->battery); >> +} >> + >> +static enum power_supply_property sc27xx_fgu_props[] = { >> + POWER_SUPPLY_PROP_STATUS, >> + POWER_SUPPLY_PROP_HEALTH, >> + POWER_SUPPLY_PROP_PRESENT, >> + POWER_SUPPLY_PROP_TEMP, >> + POWER_SUPPLY_PROP_TECHNOLOGY, >> + POWER_SUPPLY_PROP_CAPACITY, >> + POWER_SUPPLY_PROP_VOLTAGE_NOW, >> + POWER_SUPPLY_PROP_VOLTAGE_OCV, >> + POWER_SUPPLY_PROP_CURRENT_NOW, >> + POWER_SUPPLY_PROP_CURRENT_AVG, >> +}; >> + >> +static const struct power_supply_desc sc27xx_fgu_desc = { >> + .name = "sc27xx-fgu", >> + .type = POWER_SUPPLY_TYPE_BATTERY, >> + .properties = sc27xx_fgu_props, >> + .num_properties = ARRAY_SIZE(sc27xx_fgu_props), >> + .get_property = sc27xx_fgu_get_property, >> + .external_power_changed = sc27xx_fgu_external_power_changed, >> +}; >> + >> +static irqreturn_t sc27xx_fgu_bat_detection(int irq, void *dev_id) >> +{ >> + struct sc27xx_fgu_data *data = dev_id; >> + int state; >> + >> + mutex_lock(&data->lock); >> + >> + state = gpiod_get_value_cansleep(data->gpiod); >> + if (state < 0) { >> + dev_err(data->dev, "failed to get gpio state\n"); >> + mutex_unlock(&data->lock); >> + return IRQ_RETVAL(state); >> + } >> + >> + if (state) >> + data->bat_present = true; >> + else >> + data->bat_present = false; >> + >> + mutex_unlock(&data->lock); > > You want to call power_supply_changed() here. Ah, right. Missed this. > >> + return IRQ_HANDLED; >> +} >> + >> +static void sc27xx_fgu_disable(void *_data) >> +{ >> + struct sc27xx_fgu_data *data = _data; >> + >> + regmap_update_bits(data->regmap, SC27XX_CLK_EN0, SC27XX_FGU_RTC_EN, 0); >> + regmap_update_bits(data->regmap, SC27XX_MODULE_EN0, SC27XX_FGU_EN, 0); >> +} >> + >> +static int sc27xx_fgu_cap_to_clbcnt(struct sc27xx_fgu_data *data, int capacity) >> +{ >> + /* >> + * Get current capacity (mAh) = battery total capacity (mAh) * >> + * current capacity percent (capacity / 100). >> + */ >> + int cur_cap = DIV_ROUND_CLOSEST(data->total_cap * capacity, 100); >> + >> + /* >> + * Convert current capacity (mAh) to coulomb counter according to the >> + * formula: 1 mAh =3.6 coulomb. >> + */ >> + return DIV_ROUND_CLOSEST(cur_cap * 36, 10); >> +} >> + >> +static int sc27xx_fgu_hw_init(struct sc27xx_fgu_data *data) >> +{ >> + struct power_supply_battery_info info = { }; >> + int ret; >> + >> + ret = power_supply_get_battery_info(data->battery, &info); >> + if (ret) { >> + dev_err(data->dev, "failed to get battery information\n"); >> + return ret; >> + } >> + >> + data->total_cap = info.charge_full_design_uah / 1000; >> + data->max_volt = info.constant_charge_voltage_max_uv / 1000; >> + >> + /* Enable the FGU module */ >> + ret = regmap_update_bits(data->regmap, SC27XX_MODULE_EN0, >> + SC27XX_FGU_EN, SC27XX_FGU_EN); >> + if (ret) { >> + dev_err(data->dev, "failed to enable fgu\n"); >> + return ret; >> + } >> + >> + /* Enable the FGU RTC clock to make it work */ >> + ret = regmap_update_bits(data->regmap, SC27XX_CLK_EN0, >> + SC27XX_FGU_RTC_EN, SC27XX_FGU_RTC_EN); >> + if (ret) { >> + dev_err(data->dev, "failed to enable fgu RTC clock\n"); >> + goto disable_fgu; >> + } >> + >> + /* >> + * Get the boot battery capacity when system powers on, which is used to >> + * initialize the coulomb counter. After that, we can read the coulomb >> + * counter to measure the battery capacity. >> + */ >> + ret = sc27xx_fgu_get_boot_capacity(data, &data->init_cap); >> + if (ret) { >> + dev_err(data->dev, "failed to get boot capacity\n"); >> + goto disable_clk; >> + } >> + >> + /* >> + * Convert battery capacity to the corresponding initial coulomb counter >> + * and set into coulomb counter registers. >> + */ >> + data->init_clbcnt = sc27xx_fgu_cap_to_clbcnt(data, data->init_cap); >> + ret = sc27xx_fgu_set_clbcnt(data, data->init_clbcnt); >> + if (ret) { >> + dev_err(data->dev, "failed to initialize coulomb counter\n"); >> + goto disable_clk; >> + } >> + >> + return 0; >> + >> +disable_clk: >> + regmap_update_bits(data->regmap, SC27XX_CLK_EN0, SC27XX_FGU_RTC_EN, 0); >> +disable_fgu: >> + regmap_update_bits(data->regmap, SC27XX_MODULE_EN0, SC27XX_FGU_EN, 0); >> + >> + return ret; >> +} >> + >> +static int sc27xx_fgu_parse_dt(struct sc27xx_fgu_data *data, >> + struct device_node *np) >> +{ >> + const __be32 *list; >> + int i, len, size, ret; >> + >> + ret = of_property_read_u32(np, "reg", &data->base); >> + if (ret) { >> + dev_err(data->dev, "failed to get fgu address\n"); >> + return ret; >> + } >> + >> + data->gpiod = devm_gpiod_get_optional(data->dev, "bat-detect", GPIOD_IN); >> + if (IS_ERR(data->gpiod)) { >> + dev_err(data->dev, "failed to get battery detection GPIO\n"); >> + return PTR_ERR(data->gpiod); >> + } > > According to the binding (and the remaining code!) this gpio is not > optional. Yes, they are not optional. If we can not get the detection GPIO, we will return errors. So am I missing something else? Thanks for your comments. > > -- Sebastian > >> + data->channel = devm_iio_channel_get(data->dev, "bat-temp"); >> + if (IS_ERR(data->channel)) { >> + dev_err(data->dev, "failed to get IIO channel\n"); >> + return PTR_ERR(data->channel); >> + } >> + >> + /* Get the battery inner resistance */ >> + ret = of_property_read_u32(np, "sprd,inner-resist", &data->inner_resist); >> + if (ret) { >> + dev_err(data->dev, "failed to get battery inner resistance\n"); >> + return ret; >> + } >> + >> + /* Get battery ocv-capacity table */ >> + list = of_get_property(np, "sprd,ocv-cap-table", &size); >> + if (!list || !size) { >> + dev_err(data->dev, "failed to get ocv-capacity table\n"); >> + return -EINVAL; >> + } >> + >> + len = size / 8; >> + data->table_len = len; >> + data->cap_table = devm_kzalloc(data->dev, >> + sizeof(struct sc27xx_fgu_capacity_table) * len, >> + GFP_KERNEL); >> + if (!data->cap_table) >> + return -ENOMEM; >> + >> + for (i = 0; i < len; i++) { >> + data->cap_table[i].ocv = be32_to_cpu(*list++); >> + data->cap_table[i].capacity = be32_to_cpu(*list++); >> + } >> + >> + return 0; >> +} >> + >> +static int sc27xx_fgu_probe(struct platform_device *pdev) >> +{ >> + struct device_node *np = pdev->dev.of_node; >> + struct power_supply_config fgu_cfg = { }; >> + struct sc27xx_fgu_data *data; >> + int ret, irq; >> + >> + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); >> + if (!data) >> + return -ENOMEM; >> + >> + data->regmap = dev_get_regmap(pdev->dev.parent, NULL); >> + if (!data->regmap) { >> + dev_err(&pdev->dev, "failed to get regmap\n"); >> + return -ENODEV; >> + } >> + >> + mutex_init(&data->lock); >> + data->dev = &pdev->dev; >> + data->bat_present = true; >> + >> + ret = sc27xx_fgu_parse_dt(data, np); >> + if (ret) >> + return ret; >> + >> + fgu_cfg.drv_data = data; >> + fgu_cfg.of_node = np; >> + data->battery = devm_power_supply_register(&pdev->dev, &sc27xx_fgu_desc, >> + &fgu_cfg); >> + if (IS_ERR(data->battery)) { >> + dev_err(&pdev->dev, "failed to register power supply\n"); >> + return PTR_ERR(data->battery); >> + } >> + >> + ret = sc27xx_fgu_hw_init(data); >> + if (ret) { >> + dev_err(&pdev->dev, "failed to initialize fgu hardware\n"); >> + return ret; >> + } >> + >> + ret = devm_add_action(&pdev->dev, sc27xx_fgu_disable, data); >> + if (ret) { >> + sc27xx_fgu_disable(data); >> + dev_err(&pdev->dev, "failed to add fgu disable action\n"); >> + return ret; >> + } >> + >> + irq = gpiod_to_irq(data->gpiod); >> + if (irq < 0) { >> + dev_err(&pdev->dev, "failed to translate GPIO to IRQ\n"); >> + return irq; >> + } >> + >> + ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, >> + sc27xx_fgu_bat_detection, >> + IRQF_ONESHOT | IRQF_TRIGGER_RISING | >> + IRQF_TRIGGER_FALLING, >> + pdev->name, data); >> + if (ret) { >> + dev_err(&pdev->dev, "failed to request IRQ\n"); >> + return ret; >> + } >> + >> + return 0; >> +} >> + >> +static const struct of_device_id sc27xx_fgu_of_match[] = { >> + { .compatible = "sprd,sc2731-fgu", }, >> + { } >> +}; >> + >> +static struct platform_driver sc27xx_fgu_driver = { >> + .probe = sc27xx_fgu_probe, >> + .driver = { >> + .name = "sc27xx-fgu", >> + .of_match_table = sc27xx_fgu_of_match, >> + } >> +}; >> + >> +module_platform_driver(sc27xx_fgu_driver); >> + >> +MODULE_DESCRIPTION("Spreadtrum SC27XX PMICs Fual Gauge Unit Driver"); >> +MODULE_LICENSE("GPL v2"); >> -- >> 1.7.9.5 >> -- Baolin Wang Best Regards ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 2/2] power: supply: Add Spreadtrum SC27XX fuel gauge unit driver 2018-09-17 4:01 ` Baolin Wang @ 2018-09-20 0:36 ` Sebastian Reichel 2018-09-20 0:40 ` Baolin Wang 0 siblings, 1 reply; 11+ messages in thread From: Sebastian Reichel @ 2018-09-20 0:36 UTC (permalink / raw) To: Baolin Wang Cc: Rob Herring, Mark Rutland, Linux PM list, DTML, LKML, yuanjiang.yu, Mark Brown [-- Attachment #1: Type: text/plain, Size: 1226 bytes --] Hi, On Mon, Sep 17, 2018 at 12:01:51PM +0800, Baolin Wang wrote: [...] > >> +static int sc27xx_fgu_parse_dt(struct sc27xx_fgu_data *data, > >> + struct device_node *np) > >> +{ > >> + const __be32 *list; > >> + int i, len, size, ret; > >> + > >> + ret = of_property_read_u32(np, "reg", &data->base); > >> + if (ret) { > >> + dev_err(data->dev, "failed to get fgu address\n"); > >> + return ret; > >> + } > >> + > >> + data->gpiod = devm_gpiod_get_optional(data->dev, "bat-detect", GPIOD_IN); > >> + if (IS_ERR(data->gpiod)) { > >> + dev_err(data->dev, "failed to get battery detection GPIO\n"); > >> + return PTR_ERR(data->gpiod); > >> + } > > > > According to the binding (and the remaining code!) this gpio is not > > optional. > > Yes, they are not optional. If we can not get the detection GPIO, we > will return errors. So am I missing something else? > > Thanks for your comments. devm_gpiod_get_optional => devm_gpiod_get The _optional variant will return NULL if the GPIO is not specified in DT. The variant without _optional will return an error instead. -- Sebastian [-- Attachment #2: signature.asc --] [-- Type: application/pgp-signature, Size: 833 bytes --] ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 2/2] power: supply: Add Spreadtrum SC27XX fuel gauge unit driver 2018-09-20 0:36 ` Sebastian Reichel @ 2018-09-20 0:40 ` Baolin Wang 0 siblings, 0 replies; 11+ messages in thread From: Baolin Wang @ 2018-09-20 0:40 UTC (permalink / raw) To: Sebastian Reichel Cc: Rob Herring, Mark Rutland, Linux PM list, DTML, LKML, yuanjiang.yu, Mark Brown Hi, On 20 September 2018 at 08:36, Sebastian Reichel <sebastian.reichel@collabora.com> wrote: > Hi, > > On Mon, Sep 17, 2018 at 12:01:51PM +0800, Baolin Wang wrote: > [...] >> >> +static int sc27xx_fgu_parse_dt(struct sc27xx_fgu_data *data, >> >> + struct device_node *np) >> >> +{ >> >> + const __be32 *list; >> >> + int i, len, size, ret; >> >> + >> >> + ret = of_property_read_u32(np, "reg", &data->base); >> >> + if (ret) { >> >> + dev_err(data->dev, "failed to get fgu address\n"); >> >> + return ret; >> >> + } >> >> + >> >> + data->gpiod = devm_gpiod_get_optional(data->dev, "bat-detect", GPIOD_IN); >> >> + if (IS_ERR(data->gpiod)) { >> >> + dev_err(data->dev, "failed to get battery detection GPIO\n"); >> >> + return PTR_ERR(data->gpiod); >> >> + } >> > >> > According to the binding (and the remaining code!) this gpio is not >> > optional. >> >> Yes, they are not optional. If we can not get the detection GPIO, we >> will return errors. So am I missing something else? >> >> Thanks for your comments. > > devm_gpiod_get_optional => devm_gpiod_get > > The _optional variant will return NULL if the GPIO is not specified in DT. > The variant without _optional will return an error instead. Ah, you are definitely correct. I missed _optional and thanks for pointing this out. -- Baolin Wang Best Regards ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 1/2] dt-bindings: power: Add Spreadtrum SC27XX fuel gauge unit documentation 2018-09-12 7:29 [PATCH 1/2] dt-bindings: power: Add Spreadtrum SC27XX fuel gauge unit documentation Baolin Wang 2018-09-12 7:29 ` [PATCH 2/2] power: supply: Add Spreadtrum SC27XX fuel gauge unit driver Baolin Wang @ 2018-09-16 13:57 ` Sebastian Reichel 2018-09-17 3:43 ` Baolin Wang [not found] ` <20180917032625.GA25442@bogus> 2 siblings, 1 reply; 11+ messages in thread From: Sebastian Reichel @ 2018-09-16 13:57 UTC (permalink / raw) To: Baolin Wang, Craig Tatlor Cc: robh+dt, mark.rutland, linux-pm, devicetree, linux-kernel, yuanjiang.yu, broonie [-- Attachment #1: Type: text/plain, Size: 3516 bytes --] Hi, On Wed, Sep 12, 2018 at 03:29:38PM +0800, Baolin Wang wrote: > This patch adds the binding documentation for Spreadtrum SC27XX series PMICs > fuel gauge unit device, which is used to calculate the battery capacity. > > Signed-off-by: Baolin Wang <baolin.wang@linaro.org> > --- > .../devicetree/bindings/power/supply/sc27xx-fg.txt | 55 ++++++++++++++++++++ > 1 file changed, 55 insertions(+) > create mode 100644 Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt > > diff --git a/Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt b/Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt > new file mode 100644 > index 0000000..7447bae > --- /dev/null > +++ b/Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt > @@ -0,0 +1,55 @@ > +Spreadtrum SC27XX PMICs Fuel Gauge Unit Power Supply Bindings > + > +Required properties: > +- compatible: Should be one of the following: > + "sprd,sc2720-fgu", > + "sprd,sc2721-fgu", > + "sprd,sc2723-fgu", > + "sprd,sc2730-fgu", > + "sprd,sc2731-fgu". > +- reg: The address offset of fuel gauge unit. > +- bat-detect-gpio: GPIO for battery detection. > +- io-channels: Specify the IIO ADC channel to get temperature. > +- io-channel-names: Should be "bat-temp". > +- sprd,inner-resist: Specify the the battery inner resistance (mOhm). This should be a property of the battery.without the sprd, prefix. > +- sprd,ocv-cap-table: Provide the battery capacity percent with corresponding > + open circuit voltage (ocv) of the battery, which is used to look up current > + battery capacity according to current baterry ocv values. This should also be part of the battery binding. I just reviewed a patchset for the Qualcomm Battery Monitoring System, which needs the same functionality. The Qualcomm binding is more advanced, but should also support this simpler case. Thus I think it makes sense to use its description as base for adding support for this feature to Documentation/devicetree/bindings/power/supply/battery.txt -- Sebastian > +- monitored-battery: Phandle of battery characteristics devicetree node. > + The fuel gauge uses the following battery properties: > +- charge-full-design-microamp-hours: battery design capacity. > +- constant-charge-voltage-max-microvolt: maximum constant input voltage. > + See Documentation/devicetree/bindings/power/supply/battery.txt > + > +Example: > + > + bat: battery { > + compatible = "simple-battery"; > + charge-full-design-microamp-hours = <1900000>; > + constant-charge-voltage-max-microvolt = <4350000>; > + ...... > + }; > + > + sc2731_pmic: pmic@0 { > + compatible = "sprd,sc2731"; > + reg = <0>; > + spi-max-frequency = <26000000>; > + interrupts = <GIC_SPI 31 IRQ_TYPE_LEVEL_HIGH>; > + interrupt-controller; > + #interrupt-cells = <2>; > + #address-cells = <1>; > + #size-cells = <0>; > + > + fgu@a00 { > + compatible = "sprd,sc2731-fgu"; > + reg = <0xa00>; > + bat-detect-gpio = <&pmic_eic 9 GPIO_ACTIVE_HIGH>; > + io-channels = <&pmic_adc 5>; > + io-channel-names = "bat-temp"; > + sprd,inner-resist = <250>; > + sprd,ocv-cap-table = <4185 100>, <4113 95>, <4066 90>, <4022 85>, <3983 80>, <3949 75>, <3917 70>, > + <3889 65>, <3864 60>, <3835 55>, <3805 50>, <3787 45>, <3777 40>, <3773 35>, <3770 30>, > + <3765 25>, <3752 20>, <3724 15>, <3680 10>, <3605 5>, <3400 0>; > + monitored-battery = <&bat>; > + }; > + }; > -- > 1.7.9.5 > [-- Attachment #2: signature.asc --] [-- Type: application/pgp-signature, Size: 833 bytes --] ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 1/2] dt-bindings: power: Add Spreadtrum SC27XX fuel gauge unit documentation 2018-09-16 13:57 ` [PATCH 1/2] dt-bindings: power: Add Spreadtrum SC27XX fuel gauge unit documentation Sebastian Reichel @ 2018-09-17 3:43 ` Baolin Wang 2018-09-20 0:46 ` Sebastian Reichel 0 siblings, 1 reply; 11+ messages in thread From: Baolin Wang @ 2018-09-17 3:43 UTC (permalink / raw) To: Sebastian Reichel Cc: Craig Tatlor, Rob Herring, Mark Rutland, Linux PM list, DTML, LKML, yuanjiang.yu, Mark Brown Hi Sebastian, On 16 September 2018 at 21:57, Sebastian Reichel <sebastian.reichel@collabora.com> wrote: > Hi, > > On Wed, Sep 12, 2018 at 03:29:38PM +0800, Baolin Wang wrote: >> This patch adds the binding documentation for Spreadtrum SC27XX series PMICs >> fuel gauge unit device, which is used to calculate the battery capacity. >> >> Signed-off-by: Baolin Wang <baolin.wang@linaro.org> >> --- >> .../devicetree/bindings/power/supply/sc27xx-fg.txt | 55 ++++++++++++++++++++ >> 1 file changed, 55 insertions(+) >> create mode 100644 Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt >> >> diff --git a/Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt b/Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt >> new file mode 100644 >> index 0000000..7447bae >> --- /dev/null >> +++ b/Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt >> @@ -0,0 +1,55 @@ >> +Spreadtrum SC27XX PMICs Fuel Gauge Unit Power Supply Bindings >> + >> +Required properties: >> +- compatible: Should be one of the following: >> + "sprd,sc2720-fgu", >> + "sprd,sc2721-fgu", >> + "sprd,sc2723-fgu", >> + "sprd,sc2730-fgu", >> + "sprd,sc2731-fgu". >> +- reg: The address offset of fuel gauge unit. >> +- bat-detect-gpio: GPIO for battery detection. >> +- io-channels: Specify the IIO ADC channel to get temperature. >> +- io-channel-names: Should be "bat-temp". >> +- sprd,inner-resist: Specify the the battery inner resistance (mOhm). > > This should be a property of the battery.without the sprd, prefix. Right. But I did not find one proper property of the battery, so I will add one new standard property of battery named 'inner-resistance-microohm' in next version. Is it OK for you? > >> +- sprd,ocv-cap-table: Provide the battery capacity percent with corresponding >> + open circuit voltage (ocv) of the battery, which is used to look up current >> + battery capacity according to current baterry ocv values. > > This should also be part of the battery binding. I just reviewed a > patchset for the Qualcomm Battery Monitoring System, which needs the > same functionality. The Qualcomm binding is more advanced, but > should also support this simpler case. Thus I think it makes sense > to use its description as base for adding support for this feature > to Documentation/devicetree/bindings/power/supply/battery.txt That's great. But could you give me the link of Qualcomm binding, which I can change my bindings. Thanks for your comments. -- Baolin Wang Best Regards ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 1/2] dt-bindings: power: Add Spreadtrum SC27XX fuel gauge unit documentation 2018-09-17 3:43 ` Baolin Wang @ 2018-09-20 0:46 ` Sebastian Reichel 2018-09-20 0:53 ` Baolin Wang 0 siblings, 1 reply; 11+ messages in thread From: Sebastian Reichel @ 2018-09-20 0:46 UTC (permalink / raw) To: Baolin Wang Cc: Craig Tatlor, Rob Herring, Mark Rutland, Linux PM list, DTML, LKML, yuanjiang.yu, Mark Brown [-- Attachment #1: Type: text/plain, Size: 3074 bytes --] Hi, On Mon, Sep 17, 2018 at 11:43:30AM +0800, Baolin Wang wrote: > Hi Sebastian, > > On 16 September 2018 at 21:57, Sebastian Reichel > <sebastian.reichel@collabora.com> wrote: > > Hi, > > > > On Wed, Sep 12, 2018 at 03:29:38PM +0800, Baolin Wang wrote: > >> This patch adds the binding documentation for Spreadtrum SC27XX series PMICs > >> fuel gauge unit device, which is used to calculate the battery capacity. > >> > >> Signed-off-by: Baolin Wang <baolin.wang@linaro.org> > >> --- > >> .../devicetree/bindings/power/supply/sc27xx-fg.txt | 55 ++++++++++++++++++++ > >> 1 file changed, 55 insertions(+) > >> create mode 100644 Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt > >> > >> diff --git a/Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt b/Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt > >> new file mode 100644 > >> index 0000000..7447bae > >> --- /dev/null > >> +++ b/Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt > >> @@ -0,0 +1,55 @@ > >> +Spreadtrum SC27XX PMICs Fuel Gauge Unit Power Supply Bindings > >> + > >> +Required properties: > >> +- compatible: Should be one of the following: > >> + "sprd,sc2720-fgu", > >> + "sprd,sc2721-fgu", > >> + "sprd,sc2723-fgu", > >> + "sprd,sc2730-fgu", > >> + "sprd,sc2731-fgu". > >> +- reg: The address offset of fuel gauge unit. > >> +- bat-detect-gpio: GPIO for battery detection. > >> +- io-channels: Specify the IIO ADC channel to get temperature. > >> +- io-channel-names: Should be "bat-temp". > >> +- sprd,inner-resist: Specify the the battery inner resistance (mOhm). > > > > This should be a property of the battery.without the sprd, prefix. > > Right. But I did not find one proper property of the battery, so I > will add one new standard property of battery Thanks. > named 'inner-resistance-microohm' in next version. Is it OK for you? The proper suffix is -micro-ohms according to Documentation/devicetree/bindings/property-units.txt Also the proper English term is internal resistance as far as I know (and Wikipedia also names it this way), so I suggest to name the property 'internal-resistance-micro-ohms'. > >> +- sprd,ocv-cap-table: Provide the battery capacity percent with corresponding > >> + open circuit voltage (ocv) of the battery, which is used to look up current > >> + battery capacity according to current baterry ocv values. > > > > This should also be part of the battery binding. I just reviewed a > > patchset for the Qualcomm Battery Monitoring System, which needs the > > same functionality. The Qualcomm binding is more advanced, but > > should also support this simpler case. Thus I think it makes sense > > to use its description as base for adding support for this feature > > to Documentation/devicetree/bindings/power/supply/battery.txt > > That's great. But could you give me the link of Qualcomm binding, > which I can change my bindings. Thanks for your comments. https://patchwork.kernel.org/patch/10464633/ -- Sebastian [-- Attachment #2: signature.asc --] [-- Type: application/pgp-signature, Size: 833 bytes --] ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 1/2] dt-bindings: power: Add Spreadtrum SC27XX fuel gauge unit documentation 2018-09-20 0:46 ` Sebastian Reichel @ 2018-09-20 0:53 ` Baolin Wang 0 siblings, 0 replies; 11+ messages in thread From: Baolin Wang @ 2018-09-20 0:53 UTC (permalink / raw) To: Sebastian Reichel Cc: Craig Tatlor, Rob Herring, Mark Rutland, Linux PM list, DTML, LKML, yuanjiang.yu, Mark Brown Hi Sebastian, On 20 September 2018 at 08:46, Sebastian Reichel <sebastian.reichel@collabora.com> wrote: > Hi, > > On Mon, Sep 17, 2018 at 11:43:30AM +0800, Baolin Wang wrote: >> Hi Sebastian, >> >> On 16 September 2018 at 21:57, Sebastian Reichel >> <sebastian.reichel@collabora.com> wrote: >> > Hi, >> > >> > On Wed, Sep 12, 2018 at 03:29:38PM +0800, Baolin Wang wrote: >> >> This patch adds the binding documentation for Spreadtrum SC27XX series PMICs >> >> fuel gauge unit device, which is used to calculate the battery capacity. >> >> >> >> Signed-off-by: Baolin Wang <baolin.wang@linaro.org> >> >> --- >> >> .../devicetree/bindings/power/supply/sc27xx-fg.txt | 55 ++++++++++++++++++++ >> >> 1 file changed, 55 insertions(+) >> >> create mode 100644 Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt >> >> >> >> diff --git a/Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt b/Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt >> >> new file mode 100644 >> >> index 0000000..7447bae >> >> --- /dev/null >> >> +++ b/Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt >> >> @@ -0,0 +1,55 @@ >> >> +Spreadtrum SC27XX PMICs Fuel Gauge Unit Power Supply Bindings >> >> + >> >> +Required properties: >> >> +- compatible: Should be one of the following: >> >> + "sprd,sc2720-fgu", >> >> + "sprd,sc2721-fgu", >> >> + "sprd,sc2723-fgu", >> >> + "sprd,sc2730-fgu", >> >> + "sprd,sc2731-fgu". >> >> +- reg: The address offset of fuel gauge unit. >> >> +- bat-detect-gpio: GPIO for battery detection. >> >> +- io-channels: Specify the IIO ADC channel to get temperature. >> >> +- io-channel-names: Should be "bat-temp". >> >> +- sprd,inner-resist: Specify the the battery inner resistance (mOhm). >> > >> > This should be a property of the battery.without the sprd, prefix. >> >> Right. But I did not find one proper property of the battery, so I >> will add one new standard property of battery > > Thanks. > >> named 'inner-resistance-microohm' in next version. Is it OK for you? > > The proper suffix is -micro-ohms according to > Documentation/devicetree/bindings/property-units.txt > > Also the proper English term is internal resistance as far > as I know (and Wikipedia also names it this way), so I > suggest to name the property 'internal-resistance-micro-ohms'. Sure. > >> >> +- sprd,ocv-cap-table: Provide the battery capacity percent with corresponding >> >> + open circuit voltage (ocv) of the battery, which is used to look up current >> >> + battery capacity according to current baterry ocv values. >> > >> > This should also be part of the battery binding. I just reviewed a >> > patchset for the Qualcomm Battery Monitoring System, which needs the >> > same functionality. The Qualcomm binding is more advanced, but >> > should also support this simpler case. Thus I think it makes sense >> > to use its description as base for adding support for this feature >> > to Documentation/devicetree/bindings/power/supply/battery.txt >> >> That's great. But could you give me the link of Qualcomm binding, >> which I can change my bindings. Thanks for your comments. > > https://patchwork.kernel.org/patch/10464633/ Thanks. -- Baolin Wang Best Regards ^ permalink raw reply [flat|nested] 11+ messages in thread
[parent not found: <20180917032625.GA25442@bogus>]
* Re: [PATCH 1/2] dt-bindings: power: Add Spreadtrum SC27XX fuel gauge unit documentation [not found] ` <20180917032625.GA25442@bogus> @ 2018-09-17 20:45 ` Baolin Wang 0 siblings, 0 replies; 11+ messages in thread From: Baolin Wang @ 2018-09-17 20:45 UTC (permalink / raw) To: Rob Herring Cc: Sebastian Reichel, Mark Rutland, Linux PM list, DTML, LKML, yuanjiang.yu, Mark Brown Hi Rob, On 17 September 2018 at 11:26, Rob Herring <robh@kernel.org> wrote: > On Wed, Sep 12, 2018 at 03:29:38PM +0800, Baolin Wang wrote: >> This patch adds the binding documentation for Spreadtrum SC27XX series PMICs >> fuel gauge unit device, which is used to calculate the battery capacity. >> >> Signed-off-by: Baolin Wang <baolin.wang@linaro.org> >> --- >> .../devicetree/bindings/power/supply/sc27xx-fg.txt | 55 ++++++++++++++++++++ >> 1 file changed, 55 insertions(+) >> create mode 100644 Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt >> >> diff --git a/Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt b/Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt >> new file mode 100644 >> index 0000000..7447bae >> --- /dev/null >> +++ b/Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt >> @@ -0,0 +1,55 @@ >> +Spreadtrum SC27XX PMICs Fuel Gauge Unit Power Supply Bindings >> + >> +Required properties: >> +- compatible: Should be one of the following: >> + "sprd,sc2720-fgu", >> + "sprd,sc2721-fgu", >> + "sprd,sc2723-fgu", >> + "sprd,sc2730-fgu", >> + "sprd,sc2731-fgu". >> +- reg: The address offset of fuel gauge unit. >> +- bat-detect-gpio: GPIO for battery detection. > > We already have sbs,battery-detect-gpios, let's drop the 'sbs,' and copy > that. Sure. > >> +- io-channels: Specify the IIO ADC channel to get temperature. >> +- io-channel-names: Should be "bat-temp". >> +- sprd,inner-resist: Specify the the battery inner resistance (mOhm). > > If this is a property of the battery, then why a sprd vendor prefix? > This should perhaps be a common property. > > Minimally, it needs a unit suffix as defined in property-units.txt. Right. As Sebastian pointed out previously we should add one common property to describe the battery inner resistance. > >> +- sprd,ocv-cap-table: Provide the battery capacity percent with corresponding >> + open circuit voltage (ocv) of the battery, which is used to look up current >> + battery capacity according to current baterry ocv values. > > Sounds like another battery property. Yes. > >> +- monitored-battery: Phandle of battery characteristics devicetree node. > > If the battery is represented in another node, why are properties of the > battery in this node. Sure. I can remove these properties which are belonging to the battery node. Thanks. > >> + The fuel gauge uses the following battery properties: >> +- charge-full-design-microamp-hours: battery design capacity. >> +- constant-charge-voltage-max-microvolt: maximum constant input voltage. >> + See Documentation/devicetree/bindings/power/supply/battery.txt >> + >> +Example: >> + >> + bat: battery { >> + compatible = "simple-battery"; >> + charge-full-design-microamp-hours = <1900000>; >> + constant-charge-voltage-max-microvolt = <4350000>; >> + ...... >> + }; >> + >> + sc2731_pmic: pmic@0 { >> + compatible = "sprd,sc2731"; >> + reg = <0>; >> + spi-max-frequency = <26000000>; >> + interrupts = <GIC_SPI 31 IRQ_TYPE_LEVEL_HIGH>; >> + interrupt-controller; >> + #interrupt-cells = <2>; >> + #address-cells = <1>; >> + #size-cells = <0>; >> + >> + fgu@a00 { >> + compatible = "sprd,sc2731-fgu"; >> + reg = <0xa00>; >> + bat-detect-gpio = <&pmic_eic 9 GPIO_ACTIVE_HIGH>; >> + io-channels = <&pmic_adc 5>; >> + io-channel-names = "bat-temp"; >> + sprd,inner-resist = <250>; >> + sprd,ocv-cap-table = <4185 100>, <4113 95>, <4066 90>, <4022 85>, <3983 80>, <3949 75>, <3917 70>, >> + <3889 65>, <3864 60>, <3835 55>, <3805 50>, <3787 45>, <3777 40>, <3773 35>, <3770 30>, >> + <3765 25>, <3752 20>, <3724 15>, <3680 10>, <3605 5>, <3400 0>; >> + monitored-battery = <&bat>; >> + }; >> + }; >> -- >> 1.7.9.5 >> > -- Baolin Wang Best Regards ^ permalink raw reply [flat|nested] 11+ messages in thread
end of thread, other threads:[~2018-09-20 0:53 UTC | newest] Thread overview: 11+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2018-09-12 7:29 [PATCH 1/2] dt-bindings: power: Add Spreadtrum SC27XX fuel gauge unit documentation Baolin Wang 2018-09-12 7:29 ` [PATCH 2/2] power: supply: Add Spreadtrum SC27XX fuel gauge unit driver Baolin Wang 2018-09-16 14:35 ` Sebastian Reichel 2018-09-17 4:01 ` Baolin Wang 2018-09-20 0:36 ` Sebastian Reichel 2018-09-20 0:40 ` Baolin Wang 2018-09-16 13:57 ` [PATCH 1/2] dt-bindings: power: Add Spreadtrum SC27XX fuel gauge unit documentation Sebastian Reichel 2018-09-17 3:43 ` Baolin Wang 2018-09-20 0:46 ` Sebastian Reichel 2018-09-20 0:53 ` Baolin Wang [not found] ` <20180917032625.GA25442@bogus> 2018-09-17 20:45 ` Baolin Wang
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