[PATCH v1 1/2] leds: flash: add driver to support flash LED module in QCOM PMICs

[PATCH v1 1/2] leds: flash: add driver to support flash LED module in QCOM PMICs

[Fenglin Wu]

Add initial driver to support flash LED module found in Qualcomm
Technologies, Inc. PMICs. The flash module can have 3 or 4 channels
and each channel can be controlled indepedently and support full scale
current up to 1.5 A. It also supports connecting two channels together
to supply one LED component with full scale current up to 2 A. In that
case, the current will be split on each channel symmetrically and the
channels will be enabled and disabled at the same time.

Signed-off-by: Fenglin Wu <quic_fenglinw@quicinc.com>
---
 drivers/leds/flash/Kconfig           |  14 +
 drivers/leds/flash/Makefile          |   1 +
 drivers/leds/flash/leds-qcom-flash.c | 706 +++++++++++++++++++++++++++
 3 files changed, 721 insertions(+)
 create mode 100644 drivers/leds/flash/leds-qcom-flash.c

diff --git a/drivers/leds/flash/Kconfig b/drivers/leds/flash/Kconfig
index d3eb689b193c..92773fa872dc 100644
--- a/drivers/leds/flash/Kconfig
+++ b/drivers/leds/flash/Kconfig
@@ -61,6 +61,20 @@ config LEDS_MT6360
 	  Independent current sources supply for each flash LED support torch
 	  and strobe mode.
 
+config LEDS_QCOM_FLASH
+	tristate "LED support for flash module inside Qualcomm Technologies, Inc. PMIC"
+	depends on MFD_SPMI_PMIC
+	depends on LEDS_CLASS && OF
+	depends on V4L2_FLASH_LED_CLASS || !V4L2_FLASH_LED_CLASS
+	help
+	  This option enables support for the flash module found in Qualcomm
+	  Technologies, Inc. PMICs. The flash module can have 3 or 4 flash LED
+	  channels and each channel is programmable to support up to 1.5 A full
+	  scale current. It also supports connecting two channels' output together
+	  to supply one LED component to achieve current up to 2 A. In such case,
+	  the total LED current will be split symmetrically on each channel and
+	  they will be enabled/disabled at the same time.
+
 config LEDS_RT4505
 	tristate "LED support for RT4505 flashlight controller"
 	depends on I2C && OF
diff --git a/drivers/leds/flash/Makefile b/drivers/leds/flash/Makefile
index 0acbddc0b91b..8a60993f1a25 100644
--- a/drivers/leds/flash/Makefile
+++ b/drivers/leds/flash/Makefile
@@ -6,6 +6,7 @@ obj-$(CONFIG_LEDS_AS3645A)	+= leds-as3645a.o
 obj-$(CONFIG_LEDS_KTD2692)	+= leds-ktd2692.o
 obj-$(CONFIG_LEDS_LM3601X)	+= leds-lm3601x.o
 obj-$(CONFIG_LEDS_MAX77693)	+= leds-max77693.o
+obj-$(CONFIG_LEDS_QCOM_FLASH)	+= leds-qcom-flash.o
 obj-$(CONFIG_LEDS_RT4505)	+= leds-rt4505.o
 obj-$(CONFIG_LEDS_RT8515)	+= leds-rt8515.o
 obj-$(CONFIG_LEDS_SGM3140)	+= leds-sgm3140.o
diff --git a/drivers/leds/flash/leds-qcom-flash.c b/drivers/leds/flash/leds-qcom-flash.c
new file mode 100644
index 000000000000..d974958843bf
--- /dev/null
+++ b/drivers/leds/flash/leds-qcom-flash.c
@@ -0,0 +1,706 @@
+//SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#include <linux/bitops.h>
+#include <linux/leds.h>
+#include <linux/led-class-flash.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+#include <media/v4l2-flash-led-class.h>
+
+/* registers definitions */
+#define FLASH_TYPE_REG			0x04
+#define FLASH_TYPE_VAL			0x18
+
+#define FLASH_SUBTYPE_REG		0x05
+#define FLASH_SUBTYPE_3CH_VAL		0x04
+#define FLASH_SUBTYPE_4CH_VAL		0x07
+
+#define FLASH_MODULE_EN_BIT		BIT(7)
+
+#define FLASH_TIMER_EN_BIT		BIT(7)
+#define FLASH_TIMER_VAL_MASK		GENMASK(6, 0)
+#define FLASH_TIMER_STEP_MS		10
+
+#define FLASH_ITARGET_CURRENT_MASK	GENMASK(6, 0)
+
+#define FLASH_STROBE_HW_SW_SEL_BIT	BIT(2)
+#define SW_STROBE_VAL			0
+#define HW_STROBE_VAL			1
+#define FLASH_HW_STROBE_TRIGGER_SEL_BIT	BIT(1)
+#define STROBE_LEVEL_TRIGGER_VAL	0
+#define STROBE_EDGE_TRIGGER_VAL		1
+#define FLASH_STROBE_POLARITY_BIT	BIT(0)
+#define STROBE_ACTIVE_HIGH_VAL		1
+
+#define FLASH_IRES_MASK_4CH		BIT(0)
+#define FLASH_IRES_MASK_3CH		GENMASK(1, 0)
+#define FLASH_IRES_12P5MA_VAL		0
+#define FLASH_IRES_5MA_VAL_4CH		1
+#define FLASH_IRES_5MA_VAL_3CH		3
+
+/* constants */
+#define FLASH_CURRENT_MAX_UA		1500000
+#define TORCH_CURRENT_MAX_UA		500000
+#define FLASH_TOTAL_CURRENT_MAX_UA	2000000
+#define FLASH_CURRENT_DEFAULT_UA	1000000
+#define TORCH_CURRENT_DEFAULT_UA	200000
+
+#define TORCH_IRES_UA			5000
+#define FLASH_IRES_UA			12500
+
+#define FLASH_TIMEOUT_MAX_US		1280000
+#define FLASH_TIMEOUT_STEP_US		10000
+
+enum hw_type {
+	QCOM_MVFLASH_3CH,
+	QCOM_MVFLASH_4CH,
+};
+
+enum led_mode {
+	FLASH_MODE,
+	TORCH_MODE,
+};
+
+enum led_strobe {
+	SW_STROBE,
+	HW_STROBE,
+};
+
+struct qcom_flash_reg {
+	u8 module_en;
+	u8 chan_timer;
+	u8 itarget;
+	u8 iresolution;
+	u8 chan_strobe;
+	u8 chan_en;
+	u8 status1;
+	u8 status2;
+	u8 status3;
+};
+
+struct qcom_flash_led {
+	struct qcom_flash_chip		*chip;
+	struct led_classdev_flash	flash;
+	struct v4l2_flash		*v4l2_flash;
+	u32				max_flash_current_ma;
+	u32				max_torch_current_ma;
+	u32				max_timeout_ms;
+	u32				flash_current_ma;
+	u32				flash_timeout_ms;
+	u8				*chan_id;
+	u8				chan_count;
+	bool				enabled;
+};
+
+struct qcom_flash_chip {
+	struct qcom_flash_led		*leds;
+	const struct qcom_flash_reg	*reg;
+	struct device			*dev;
+	struct regmap			*regmap;
+	struct mutex			lock;
+	enum hw_type			hw_type;
+	u32				reg_base;
+	u8				leds_count;
+	u8				max_channels;
+	u8				chan_en_bits;
+};
+
+static const struct qcom_flash_reg mvflash_3ch_reg = {
+	.chan_timer	= 0x40,
+	.itarget	= 0x43,
+	.module_en	= 0x46,
+	.iresolution	= 0x47,
+	.chan_strobe	= 0x49,
+	.chan_en	= 0x4c,
+	.status1	= 0x08,
+	.status2	= 0x09,
+	.status3	= 0x0a,
+};
+
+static const struct qcom_flash_reg mvflash_4ch_reg = {
+	.chan_timer	= 0x3e,
+	.itarget	= 0x42,
+	.module_en	= 0x46,
+	.iresolution	= 0x49,
+	.chan_strobe	= 0x4a,
+	.chan_en	= 0x4e,
+	.status1	= 0x06,
+	.status2	= 0x07,
+	.status3	= 0x09,
+};
+
+static int __set_flash_module_en(struct qcom_flash_led *led, bool en)
+{
+	struct qcom_flash_chip *chip = led->chip;
+	u8 led_mask = 0, val;
+	int i, rc;
+
+	for (i = 0; i < led->chan_count; i++)
+		led_mask |= BIT(led->chan_id[i] - 1);
+
+	mutex_lock(&chip->lock);
+	if (en)
+		chip->chan_en_bits |= led_mask;
+	else
+		chip->chan_en_bits &= ~led_mask;
+
+	val = (!!chip->chan_en_bits) ? FLASH_MODULE_EN_BIT : 0;
+	rc = regmap_update_bits(chip->regmap, chip->reg_base + chip->reg->module_en,
+				FLASH_MODULE_EN_BIT, val);
+	mutex_unlock(&chip->lock);
+
+	return rc;
+}
+
+static int __set_flash_current(struct qcom_flash_led *led, u32 current_ma, enum led_mode mode)
+{
+	struct qcom_flash_chip *chip = led->chip;
+	u32 itarg_ua = current_ma * 1000 / led->chan_count + 1;
+	u32 ires_ua = (mode == FLASH_MODE) ? FLASH_IRES_UA : TORCH_IRES_UA;
+	u8 reg, val, shift, ires_mask = 0, ires_val = 0, chan_id;
+	int i, rc;
+
+	/*
+	 * Split the current across the channels and set the
+	 * IRESOLUTION and ITARGET registers accordingly.
+	 */
+	for (i = 0; i < led->chan_count; i++) {
+		chan_id = led->chan_id[i];
+		if (itarg_ua < ires_ua)
+			val = 0;
+		else
+			val = itarg_ua / ires_ua - 1;
+
+		reg = chip->reg->itarget + chan_id - 1;
+		rc = regmap_update_bits(chip->regmap, chip->reg_base + reg,
+				FLASH_ITARGET_CURRENT_MASK, val);
+		if (rc < 0)
+			return rc;
+
+		if (chip->hw_type == QCOM_MVFLASH_3CH) {
+			shift = (chan_id - 1) * 2;
+			ires_mask |= FLASH_IRES_MASK_3CH << shift;
+			ires_val |= ((mode == FLASH_MODE) ?
+				(FLASH_IRES_12P5MA_VAL << shift) :
+				(FLASH_IRES_5MA_VAL_3CH << shift));
+		} else if (chip->hw_type == QCOM_MVFLASH_4CH) {
+			shift = chan_id - 1;
+			ires_mask |= FLASH_IRES_MASK_4CH << shift;
+			ires_val |= ((mode == FLASH_MODE) ?
+				(FLASH_IRES_12P5MA_VAL << shift) :
+				(FLASH_IRES_5MA_VAL_4CH << shift));
+		}
+	}
+
+	reg = chip->reg->iresolution;
+
+	return regmap_update_bits(chip->regmap, chip->reg_base + reg, ires_mask, ires_val);
+}
+
+static int __set_flash_timeout(struct qcom_flash_led *led, u32 timeout_ms)
+{
+	struct qcom_flash_chip *chip = led->chip;
+	u8 reg, mask, val, chan_id;
+	int rc, i;
+
+	/* set SAFETY_TIMER for all the channels connected to the same LED */
+	timeout_ms = min_t(u32, timeout_ms, led->max_timeout_ms);
+	for (i = 0; i < led->chan_count; i++) {
+		chan_id = led->chan_id[i];
+		mask = 0xff;
+		val = timeout_ms / FLASH_TIMER_STEP_MS;
+		val = clamp_t(u8, val, 0, FLASH_TIMER_VAL_MASK);
+		if (timeout_ms)
+			val |= FLASH_TIMER_EN_BIT;
+
+		reg = chip->reg->chan_timer + chan_id - 1;
+		rc = regmap_update_bits(chip->regmap, chip->reg_base + reg, mask, val);
+		if (rc < 0)
+			return rc;
+
+	}
+
+	return 0;
+}
+
+static int __set_flash_strobe(struct qcom_flash_led *led, enum led_strobe strobe, bool state)
+{
+	struct qcom_flash_chip *chip = led->chip;
+	u8 reg, mask, val, chan_id = 0, chan_mask = 0;
+	int rc, i;
+
+	/* Set SW strobe config for all channels connected to the LED */
+	for (i = 0; i < led->chan_count; i++) {
+		chan_id = led->chan_id[i];
+		mask = FLASH_STROBE_HW_SW_SEL_BIT | FLASH_HW_STROBE_TRIGGER_SEL_BIT
+			| FLASH_STROBE_POLARITY_BIT;
+		if (strobe == SW_STROBE)
+			val = FIELD_PREP(FLASH_STROBE_HW_SW_SEL_BIT, SW_STROBE_VAL);
+		else
+			val = FIELD_PREP(FLASH_STROBE_HW_SW_SEL_BIT, HW_STROBE_VAL);
+
+		val |= FIELD_PREP(FLASH_HW_STROBE_TRIGGER_SEL_BIT, STROBE_LEVEL_TRIGGER_VAL) |
+			FIELD_PREP(FLASH_STROBE_POLARITY_BIT, STROBE_ACTIVE_HIGH_VAL);
+		reg = chip->reg->chan_strobe + chan_id - 1;
+		rc = regmap_update_bits(chip->regmap, chip->reg_base + reg, mask, val);
+		if (rc < 0)
+			return rc;
+
+		chan_mask |= BIT(chan_id - 1);
+	}
+
+	/* enable/disable flash channels */
+	mask = chan_mask;
+	val = state ? mask : 0;
+	reg = chip->reg->chan_en;
+	rc = regmap_update_bits(chip->regmap, chip->reg_base + reg, mask, val);
+	if (rc < 0)
+		return rc;
+
+	led->enabled = state;
+	return 0;
+}
+
+static int qcom_flash_brightness_set(struct led_classdev_flash *fled_cdev, u32 brightness)
+{
+	struct qcom_flash_led *led = container_of(fled_cdev, struct qcom_flash_led, flash);
+
+	led->flash_current_ma = min_t(u32, led->max_flash_current_ma, brightness / 1000);
+	return 0;
+}
+
+static int qcom_flash_timeout_set(struct led_classdev_flash *fled_cdev, u32 timeout)
+{
+	struct qcom_flash_led *led = container_of(fled_cdev, struct qcom_flash_led, flash);
+
+	led->flash_timeout_ms = timeout / 1000;
+	return 0;
+}
+
+static int qcom_flash_strobe_set(struct led_classdev_flash *fled_cdev, bool state)
+{
+	struct qcom_flash_led *led = container_of(fled_cdev, struct qcom_flash_led, flash);
+	int rc;
+
+	rc = __set_flash_current(led, led->flash_current_ma, FLASH_MODE);
+	if (rc < 0)
+		return rc;
+
+	rc = __set_flash_timeout(led, led->flash_timeout_ms);
+	if (rc < 0)
+		return rc;
+
+	rc = __set_flash_module_en(led, state);
+	if (rc < 0)
+		return rc;
+
+	return __set_flash_strobe(led, SW_STROBE, state);
+}
+
+static int qcom_flash_strobe_get(struct led_classdev_flash *fled_cdev, bool *state)
+{
+	struct qcom_flash_led *led = container_of(fled_cdev, struct qcom_flash_led, flash);
+
+	*state = led->enabled;
+	return 0;
+}
+
+static int qcom_flash_fault_get(struct led_classdev_flash *fled_cdev, u32 *fault)
+{
+	struct qcom_flash_led *led = container_of(fled_cdev, struct qcom_flash_led, flash);
+	struct qcom_flash_chip *chip = led->chip;
+	u8 shift, chan_id = 0, chan_mask = 0;
+	u8 ot_mask = 0, oc_mask = 0, uv_mask = 0;
+	u32 val, fault_sts = 0;
+	int i, rc;
+
+	rc = regmap_read(chip->regmap, chip->reg_base + chip->reg->status1, &val);
+	if (rc < 0)
+		return rc;
+
+	for (i = 0; i < led->chan_count; i++) {
+		chan_id = led->chan_id[i];
+		shift = (chan_id - 1) * 2;
+		if (val & BIT(shift))
+			fault_sts |= LED_FAULT_SHORT_CIRCUIT;
+		chan_mask |= BIT(chan_id - 1);
+	}
+
+	rc = regmap_read(chip->regmap, chip->reg_base + chip->reg->status2, &val);
+	if (rc < 0)
+		return rc;
+
+	if (chip->hw_type == QCOM_MVFLASH_3CH) {
+		ot_mask = 0x0f;
+		oc_mask = 0xe0;
+		uv_mask = 0x10;
+	} else if (chip->hw_type == QCOM_MVFLASH_4CH) {
+		ot_mask = 0x70;
+		oc_mask = 0x0e;
+		uv_mask = 0x01;
+	}
+
+	if (val & ot_mask)
+		fault_sts |= LED_FAULT_OVER_TEMPERATURE;
+	if (val & oc_mask)
+		fault_sts |= LED_FAULT_OVER_CURRENT;
+	if (val & uv_mask)
+		fault_sts |= LED_FAULT_INPUT_VOLTAGE;
+
+	rc = regmap_read(chip->regmap, chip->reg_base + chip->reg->status3, &val);
+	if (rc < 0)
+		return rc;
+
+	if (chip->hw_type == QCOM_MVFLASH_3CH) {
+		if (val & chan_mask)
+			fault_sts |= LED_FAULT_TIMEOUT;
+	} else if (chip->hw_type == QCOM_MVFLASH_4CH) {
+		for (i = 0; i < led->chan_count; i++) {
+			chan_id = led->chan_id[i];
+			shift = (chan_id - 1) * 2;
+			if (val & BIT(shift))
+				fault_sts |= LED_FAULT_TIMEOUT;
+		}
+	}
+
+	*fault = fault_sts;
+	return 0;
+}
+
+static int qcom_flash_led_brightness_set(struct led_classdev *led_cdev,
+					enum led_brightness brightness)
+{
+	struct led_classdev_flash *fled_cdev =
+		container_of(led_cdev, struct led_classdev_flash, led_cdev);
+	struct qcom_flash_led *led =
+		container_of(fled_cdev, struct qcom_flash_led, flash);
+	u32 current_ma = brightness * led->max_torch_current_ma / LED_FULL;
+	bool enable = !!brightness;
+	int rc;
+
+	rc = __set_flash_current(led, current_ma, TORCH_MODE);
+	if (rc < 0)
+		return rc;
+
+	/* disable flash timeout for torch LED */
+	rc = __set_flash_timeout(led, 0);
+	if (rc < 0)
+		return rc;
+
+	rc = __set_flash_module_en(led, enable);
+	if (rc < 0)
+		return rc;
+
+	return __set_flash_strobe(led, SW_STROBE, enable);
+}
+
+static const struct led_flash_ops qcom_flash_ops = {
+	.flash_brightness_set = qcom_flash_brightness_set,
+	.strobe_set = qcom_flash_strobe_set,
+	.strobe_get = qcom_flash_strobe_get,
+	.timeout_set = qcom_flash_timeout_set,
+	.fault_get = qcom_flash_fault_get,
+};
+
+#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
+static int qcom_flash_external_strobe_set(struct v4l2_flash *v4l2_flash, bool enable)
+{
+	struct led_classdev_flash *flash = v4l2_flash->fled_cdev;
+	struct qcom_flash_led *led = container_of(flash, struct qcom_flash_led, flash);
+	int rc;
+
+	rc = __set_flash_module_en(led, enable);
+	if (rc < 0)
+		return rc;
+
+	if (enable)
+		return __set_flash_strobe(led, HW_STROBE, true);
+	else
+		return __set_flash_strobe(led, SW_STROBE, false);
+}
+
+static enum led_brightness qcom_flash_intensity_to_led_brightness(
+		struct v4l2_flash *v4l2_flash, s32 intensity)
+{
+	struct led_classdev_flash *flash = v4l2_flash->fled_cdev;
+	struct qcom_flash_led *led = container_of(flash, struct qcom_flash_led, flash);
+	u32 current_ma = intensity / 1000;
+
+	current_ma = min_t(u32, current_ma, led->max_torch_current_ma);
+	if (!current_ma)
+		return LED_OFF;
+
+	return current_ma * LED_FULL / led->max_torch_current_ma;
+}
+
+static s32 qcom_flash_brightness_to_led_intensity(struct v4l2_flash *v4l2_flash,
+					enum led_brightness brightness)
+{
+	struct led_classdev_flash *flash = v4l2_flash->fled_cdev;
+	struct qcom_flash_led *led = container_of(flash, struct qcom_flash_led, flash);
+
+	return (brightness * led->max_torch_current_ma * 1000) / LED_FULL;
+}
+
+static const struct v4l2_flash_ops qcom_v4l2_flash_ops = {
+	.external_strobe_set = qcom_flash_external_strobe_set,
+	.intensity_to_led_brightness = qcom_flash_intensity_to_led_brightness,
+	.led_brightness_to_intensity = qcom_flash_brightness_to_led_intensity,
+};
+
+static int qcom_flash_v4l2_init(struct qcom_flash_led *led, struct fwnode_handle *fwnode)
+{
+	struct v4l2_flash_config v4l2_cfg = {0};
+	struct led_flash_setting *s = &v4l2_cfg.intensity;
+
+	if (!(led->flash.led_cdev.flags & LED_DEV_CAP_FLASH))
+		return 0;
+
+	s->min = s->step = TORCH_IRES_UA * led->chan_count;
+	s->max = led->max_torch_current_ma * 1000;
+	s->val = min_t(u32, s->max, TORCH_CURRENT_DEFAULT_UA);
+
+	strscpy(v4l2_cfg.dev_name, led->flash.led_cdev.dev->kobj.name,
+					sizeof(v4l2_cfg.dev_name));
+	v4l2_cfg.has_external_strobe = 1;
+	v4l2_cfg.flash_faults = LED_FAULT_INPUT_VOLTAGE | LED_FAULT_OVER_CURRENT |
+		LED_FAULT_SHORT_CIRCUIT | LED_FAULT_OVER_TEMPERATURE | LED_FAULT_TIMEOUT;
+
+	led->v4l2_flash = v4l2_flash_init(led->chip->dev, fwnode, &led->flash,
+					&qcom_v4l2_flash_ops, &v4l2_cfg);
+	return PTR_ERR_OR_ZERO(led->v4l2_flash);
+}
+# else
+static int qcom_flash_v4l2_init(struct qcom_flash_led *led, struct fwnode_handle *fwnode)
+{
+	return 0;
+}
+#endif
+
+static int qcom_flash_register_led_device(struct device *parent,
+		struct fwnode_handle *node, struct qcom_flash_led *led)
+{
+	struct qcom_flash_chip *chip = led->chip;
+	struct led_init_data init_data;
+	struct led_classdev_flash *flash;
+	struct led_flash_setting *s;
+	u32 count, val;
+	u32 channels[4];
+	int i, rc;
+
+	flash = &led->flash;
+	count = fwnode_property_count_u32(node, "led-sources");
+	if (count <= 0) {
+		dev_err(chip->dev, "No led-sources specified\n");
+		return -ENODEV;
+	}
+
+	if (count > chip->max_channels) {
+		dev_err(chip->dev, "led-sources count %u exceeds maximum channel count %u\n",
+				count, chip->max_channels);
+		return -EINVAL;
+	}
+
+	rc = fwnode_property_read_u32_array(node, "led-sources", channels, count);
+	if (rc < 0) {
+		dev_err(chip->dev, "get led-sources failed, rc=%d\n", rc);
+		return rc;
+	}
+
+	led->chan_count = count;
+	led->chan_id = devm_kcalloc(chip->dev, count, sizeof(u8), GFP_KERNEL);
+	if (!led->chan_id)
+		return -ENOMEM;
+
+	for (i = 0; i < count; i++) {
+		if (channels[i] > chip->max_channels) {
+			dev_err(chip->dev, "led-source out of HW support range [1-%u]\n",
+					chip->max_channels);
+			return -EINVAL;
+		}
+
+		led->chan_id[i] = channels[i];
+	}
+
+	rc = fwnode_property_read_u32(node, "led-max-microamp", &val);
+	if (rc < 0) {
+		dev_err(chip->dev, "Get led-max-microamp failed, rc=%d\n", rc);
+		return rc;
+	}
+
+	if (!val) {
+		dev_err(chip->dev, "led-max-microamp shouldn't be 0\n");
+		return -EINVAL;
+	}
+
+	val = min_t(u32, val, TORCH_CURRENT_MAX_UA * led->chan_count);
+	led->max_torch_current_ma = val / 1000;
+
+	if (fwnode_property_present(node, "flash-max-microamp")) {
+		flash->led_cdev.flags |= LED_DEV_CAP_FLASH;
+		rc = fwnode_property_read_u32(node, "flash-max-microamp", &val);
+		if (rc < 0) {
+			dev_err(chip->dev, "Get flash-max-microamp failed, rc=%d\n", rc);
+			return rc;
+		}
+
+		val = min_t(u32, val, FLASH_CURRENT_MAX_UA * led->chan_count);
+		val = min_t(u32, val, FLASH_TOTAL_CURRENT_MAX_UA);
+		s = &flash->brightness;
+		s->min = s->step = FLASH_IRES_UA * led->chan_count;
+		s->max = val;
+		s->val = min_t(u32, val, FLASH_CURRENT_DEFAULT_UA);
+		led->max_flash_current_ma = val / 1000;
+		led->flash_current_ma = s->val / 1000;
+
+		rc = fwnode_property_read_u32(node, "flash-max-timeout-us", &val);
+		if (rc < 0) {
+			dev_err(chip->dev, "Get flash-max-timeout-us failed, rc=%d\n", rc);
+			return rc;
+		}
+
+		val = min_t(u32, val, FLASH_TIMEOUT_MAX_US);
+		s = &flash->timeout;
+		s->min = s->step = FLASH_TIMEOUT_STEP_US;
+		s->val = s->max = val;
+		led->max_timeout_ms = led->flash_timeout_ms = val / 1000;
+
+		flash->ops = &qcom_flash_ops;
+	}
+
+	flash->led_cdev.brightness_set_blocking = qcom_flash_led_brightness_set;
+	init_data.fwnode = node;
+	init_data.devicename = NULL;
+	init_data.default_label = NULL;
+	init_data.devname_mandatory = false;
+	rc = devm_led_classdev_flash_register_ext(parent, flash, &init_data);
+	if (rc < 0) {
+		dev_err(chip->dev, "Register flash LED classdev failed, rc=%d\n", rc);
+		return rc;
+	}
+
+	return qcom_flash_v4l2_init(led, node);
+}
+
+static int qcom_flash_led_probe(struct platform_device *pdev)
+{
+	struct qcom_flash_chip *chip;
+	struct qcom_flash_led *led;
+	struct fwnode_handle *child;
+	struct device *dev = &pdev->dev;
+	int count, rc;
+	u32 val;
+
+	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
+	chip->regmap = dev_get_regmap(dev->parent, NULL);
+	if (!chip->regmap) {
+		dev_err(dev, "Failed to get parent regmap\n");
+		return -EINVAL;
+	}
+
+	rc = fwnode_property_read_u32(dev->fwnode, "reg", &chip->reg_base);
+	if (rc < 0) {
+		dev_err(dev, "Failed to get register base address, rc=%d\n", rc);
+		return rc;
+	}
+
+	rc = regmap_read(chip->regmap, chip->reg_base + FLASH_TYPE_REG, &val);
+	if (rc < 0) {
+		dev_err(dev, "Read flash module type failed, rc=%d\n", rc);
+		return rc;
+	}
+
+	if (val != FLASH_TYPE_VAL) {
+		dev_err(dev, "type %#x is not a flash module\n", val);
+		return -ENODEV;
+	}
+
+	rc = regmap_read(chip->regmap, chip->reg_base + FLASH_SUBTYPE_REG, &val);
+	if (rc < 0) {
+		dev_err(dev, "Read flash module subtype failed, rc=%d\n", rc);
+		return rc;
+	}
+
+	if (val == FLASH_SUBTYPE_3CH_VAL) {
+		chip->hw_type = QCOM_MVFLASH_3CH;
+		chip->max_channels = 3;
+		chip->reg = &mvflash_3ch_reg;
+	} else if (val == FLASH_SUBTYPE_4CH_VAL) {
+		chip->hw_type = QCOM_MVFLASH_4CH;
+		chip->max_channels = 4;
+		chip->reg = &mvflash_4ch_reg;
+	} else {
+		dev_err(dev, "flash subtype %#x is not yet supported\n", val);
+		return -ENODEV;
+	}
+
+	chip->dev = dev;
+	platform_set_drvdata(pdev, chip);
+	mutex_init(&chip->lock);
+	count = device_get_child_node_count(dev);
+	if (count == 0 || count > chip->max_channels) {
+		dev_err(dev, "No child or child count exceeds %d\n", chip->max_channels);
+		return -EINVAL;
+	}
+
+	chip->leds = devm_kcalloc(dev, count, sizeof(*chip->leds), GFP_KERNEL);
+	if (!chip->leds)
+		return -ENOMEM;
+
+	device_for_each_child_node(dev, child) {
+		led = &chip->leds[chip->leds_count];
+		led->chip = chip;
+		rc = qcom_flash_register_led_device(dev, child, led);
+		if (rc < 0)
+			goto release;
+
+		chip->leds_count++;
+	}
+
+	return 0;
+release:
+	while (chip->leds && chip->leds_count--)
+		v4l2_flash_release(chip->leds[chip->leds_count].v4l2_flash);
+	return rc;
+}
+
+static int qcom_flash_led_remove(struct platform_device *pdev)
+{
+	struct qcom_flash_chip *chip = platform_get_drvdata(pdev);
+
+	while (chip->leds_count--)
+		v4l2_flash_release(chip->leds[chip->leds_count].v4l2_flash);
+
+	mutex_destroy(&chip->lock);
+	return 0;
+}
+
+static const struct of_device_id qcom_flash_led_match_table[] = {
+	{ .compatible = "qcom,spmi-flash-led" },
+	{ .compatible = "qcom,pm8150c-flash-led" },
+	{ .compatible = "qcom,pm8150l-flash-led" },
+	{ .compatible = "qcom,pm8350c-flash-led" },
+	{ }
+};
+
+static struct platform_driver qcom_flash_led_driver = {
+	.driver = {
+		.name = "leds-qcom-flash",
+		.of_match_table = qcom_flash_led_match_table,
+	},
+	.probe = qcom_flash_led_probe,
+	.remove = qcom_flash_led_remove,
+};
+
+module_platform_driver(qcom_flash_led_driver);
+
+MODULE_DESCRIPTION("QCOM Flash LED driver");
+MODULE_LICENSE("GPL");
-- 
2.25.1

[PATCH v1 2/2] dt-bindings: add bindings for QCOM flash LED

[Fenglin Wu]

Add binding document for flash LED module inside Qualcomm Technologies,
Inc. PMICs.

Signed-off-by: Fenglin Wu <quic_fenglinw@quicinc.com>
---
 .../bindings/leds/leds-qcom-flash.yaml        | 108 ++++++++++++++++++
 1 file changed, 108 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/leds/leds-qcom-flash.yaml

diff --git a/Documentation/devicetree/bindings/leds/leds-qcom-flash.yaml b/Documentation/devicetree/bindings/leds/leds-qcom-flash.yaml
new file mode 100644
index 000000000000..52a99182961b
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/leds-qcom-flash.yaml
@@ -0,0 +1,108 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/leds/leds-qcom-flash.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Flash LED device inside Qualcomm Technologies, Inc. PMICs
+
+maintainers:
+  - Fenglin Wu <quic_fenglinw@quicinc.com>
+
+description: |
+  Flash LED controller is present inside some Qualcomm Technologies, Inc. PMICs.
+  The flash LED module can have different number of LED channels supported
+  e.g. 3 or 4. There are some different registers between them but they can
+  both support maximum current up to 1.5 A per channel and they can also support
+  ganging 2 channels together to supply maximum current up to 2 A. The current
+  will be split symmetrically on each channel and they will be enabled and
+  disabled at the same time.
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - qcom,spmi-flash-led
+          - qcom,pm8150c-flash-led
+          - qcom,pm8150l-flash-led
+          - qcom,pm8350c-flash-led
+
+  reg:
+    description: address offset of the flash LED controller
+    maxItems: 1
+
+patternProperties:
+  "^led@[0-3]$":
+    type: object
+    $ref: common.yaml#
+    unevaluatedProperties: false
+    description:
+      Represents the physical LED components which are connected to the flash LED channels' output.
+
+    properties:
+      led-sources:
+        description: The HW indices of the flash LED channels that connect to the physical LED
+        allOf:
+          - minItems: 1
+            maxItems: 2
+            items:
+              enum: [1, 2, 3, 4]
+
+      led-max-microamp:
+        description: |
+          The maximum current value when LED is not operating in flash mode (i.e. torch mode)
+          Valid values when an LED is connected to one flash LED channel:
+            5000 - 500000, step by 5000
+          Valid values when an LED is connected to two flash LED channels:
+            10000 - 1000000, step by 10000
+
+      flash-max-microamp:
+        description: |
+          The maximum current value when LED is operating in flash mode.
+          Valid values when an LED is connected to one flash LED channel:
+            12500 - 1500000, step by 12500
+          Valid values when an LED is connected to two flash LED channels:
+            25000 - 2000000, step by 12500
+
+      flash-max-timeout-us:
+        description: |
+          The maximum timeout value when LED is operating in flash mode.
+          Valid values: 10000 - 1280000, step by 10000
+
+    required:
+      - led-sources
+      - led-max-microamp
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/leds/common.h>
+    flash-led@ee00 {
+            compatible = "qcom,spmi-flash-led";
+            reg = <0xee00>;
+
+            led@0 {
+                    function = LED_FUNCTION_FLASH;
+                    color = <LED_COLOR_ID_WHITE>;
+                    led-sources = <1>, <4>;
+                    led-max-microamp = <300000>;
+                    flash-max-microamp = <2000000>;
+                    flash-max-timeout-us = <1280000>;
+                    function-enumerator = <0>;
+            };
+
+            led@1 {
+                    function = LED_FUNCTION_FLASH;
+                    color = <LED_COLOR_ID_YELLOW>;
+                    led-sources = <2>, <3>;
+                    led-max-microamp = <300000>;
+                    flash-max-microamp = <2000000>;
+                    flash-max-timeout-us = <1280000>;
+                    function-enumerator = <1>;
+            };
+    };
-- 
2.25.1

Re: [PATCH v1 2/2] dt-bindings: add bindings for QCOM flash LED

[Krzysztof Kozlowski]

On 28/09/2022 04:42, Fenglin Wu wrote:
> Add binding document for flash LED module inside Qualcomm Technologies,
> Inc. PMICs.
> 
> Signed-off-by: Fenglin Wu <quic_fenglinw@quicinc.com>

You did not Cc me on first patch, so difficult to say how much it
matches the driver... There is also no DTS.

> ---
>  .../bindings/leds/leds-qcom-flash.yaml        | 108 ++++++++++++++++++
>  1 file changed, 108 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/leds/leds-qcom-flash.yaml
> 
> diff --git a/Documentation/devicetree/bindings/leds/leds-qcom-flash.yaml b/Documentation/devicetree/bindings/leds/leds-qcom-flash.yaml
> new file mode 100644
> index 000000000000..52a99182961b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/leds-qcom-flash.yaml


Filename matching compatible if there is one fallback (e.g.
qcom,spmi-flash-led.yaml).

> @@ -0,0 +1,108 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/leds/leds-qcom-flash.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Flash LED device inside Qualcomm Technologies, Inc. PMICs
> +
> +maintainers:
> +  - Fenglin Wu <quic_fenglinw@quicinc.com>
> +
> +description: |
> +  Flash LED controller is present inside some Qualcomm Technologies, Inc. PMICs.
> +  The flash LED module can have different number of LED channels supported
> +  e.g. 3 or 4. There are some different registers between them but they can
> +  both support maximum current up to 1.5 A per channel and they can also support
> +  ganging 2 channels together to supply maximum current up to 2 A. The current
> +  will be split symmetrically on each channel and they will be enabled and
> +  disabled at the same time.
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          - qcom,spmi-flash-led
> +          - qcom,pm8150c-flash-led
> +          - qcom,pm8150l-flash-led
> +          - qcom,pm8350c-flash-led

I doubt these are all different. You should use fallback, which also
will make use of the "items" you used...

> +
> +  reg:
> +    description: address offset of the flash LED controller
> +    maxItems: 1
> +
> +patternProperties:
> +  "^led@[0-3]$":
> +    type: object
> +    $ref: common.yaml#
> +    unevaluatedProperties: false
> +    description:
> +      Represents the physical LED components which are connected to the flash LED channels' output.

Does not look like wrapped at 80.

Other places as well.

> +
> +    properties:

Does not look like you tested the bindings...

You miss here reg.

> +      led-sources:
> +        description: The HW indices of the flash LED channels that connect to the physical LED
> +        allOf:
> +          - minItems: 1
> +            maxItems: 2
> +            items:
> +              enum: [1, 2, 3, 4]
> +
> +      led-max-microamp:
> +        description: |
> +          The maximum current value when LED is not operating in flash mode (i.e. torch mode)
> +          Valid values when an LED is connected to one flash LED channel:
> +            5000 - 500000, step by 5000> +          Valid values when an LED is connected to two flash LED
channels:
> +            10000 - 1000000, step by 10000

You need minimum and maximum.

> +
> +      flash-max-microamp:
> +        description: |
> +          The maximum current value when LED is operating in flash mode.
> +          Valid values when an LED is connected to one flash LED channel:
> +            12500 - 1500000, step by 12500
> +          Valid values when an LED is connected to two flash LED channels:
> +            25000 - 2000000, step by 12500

You need minimum and maximum.


> +
> +      flash-max-timeout-us:
> +        description: |
> +          The maximum timeout value when LED is operating in flash mode.
> +          Valid values: 10000 - 1280000, step by 10000

You need minimum and maximum.

> +
> +    required:
> +      - led-sources
> +      - led-max-microamp

reg.

> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/leds/common.h>
> +    flash-led@ee00 {

Node name: led-controller

> +            compatible = "qcom,spmi-flash-led";
> +            reg = <0xee00>;
> +
> +            led@0 {

Test your bindings...

> +                    function = LED_FUNCTION_FLASH;

Use 4 spaces for indentation of example.

> +                    color = <LED_COLOR_ID_WHITE>;
> +                    led-sources = <1>, <4>;
> +                    led-max-microamp = <300000>;
> +                    flash-max-microamp = <2000000>;
> +                    flash-max-timeout-us = <1280000>;
> +                    function-enumerator = <0>;
> +            };
> +

Best regards,
Krzysztof

Re: [PATCH v1 2/2] dt-bindings: add bindings for QCOM flash LED

[Fenglin Wu]

On 2022/9/28 16:21, Krzysztof Kozlowski wrote:
> On 28/09/2022 04:42, Fenglin Wu wrote:
>> Add binding document for flash LED module inside Qualcomm Technologies,
>> Inc. PMICs.
>>
>> Signed-off-by: Fenglin Wu <quic_fenglinw@quicinc.com>
> 
> You did not Cc me on first patch, so difficult to say how much it
> matches the driver... There is also no DTS.
Thanks for reviewing the binding change, I sent the driver changes in 
the same series and you can check it here:
https://lore.kernel.org/linux-leds/6c0e5083-baae-3ed3-5eed-e08bbb9e7576@linaro.org/T/#m97f71ce3f291f62d65f8107352d8ab9507093ab2

I will add you in email to list when sending next patchset.
> 
>> ---
>>   .../bindings/leds/leds-qcom-flash.yaml        | 108 ++++++++++++++++++
>>   1 file changed, 108 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/leds/leds-qcom-flash.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/leds/leds-qcom-flash.yaml b/Documentation/devicetree/bindings/leds/leds-qcom-flash.yaml
>> new file mode 100644
>> index 000000000000..52a99182961b
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/leds/leds-qcom-flash.yaml
> 
> 
> Filename matching compatible if there is one fallback (e.g.
> qcom,spmi-flash-led.yaml).
> 
Sure, I will update the file name to match with the fallback compatible 
string.
>> @@ -0,0 +1,108 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/leds/leds-qcom-flash.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Flash LED device inside Qualcomm Technologies, Inc. PMICs
>> +
>> +maintainers:
>> +  - Fenglin Wu <quic_fenglinw@quicinc.com>
>> +
>> +description: |
>> +  Flash LED controller is present inside some Qualcomm Technologies, Inc. PMICs.
>> +  The flash LED module can have different number of LED channels supported
>> +  e.g. 3 or 4. There are some different registers between them but they can
>> +  both support maximum current up to 1.5 A per channel and they can also support
>> +  ganging 2 channels together to supply maximum current up to 2 A. The current
>> +  will be split symmetrically on each channel and they will be enabled and
>> +  disabled at the same time.
>> +
>> +properties:
>> +  compatible:
>> +    items:
>> +      - enum:
>> +          - qcom,spmi-flash-led
>> +          - qcom,pm8150c-flash-led
>> +          - qcom,pm8150l-flash-led
>> +          - qcom,pm8350c-flash-led
> 
> I doubt these are all different. You should use fallback, which also
> will make use of the "items" you used...
pm8150c and pm8150l are different PMIC variants which have same flash 
LED module with 3 flash LED channels, while pm8350c has a different 
flash LED module with 4 flash LED channels. They can all use 
"qcom,spmi-flash-led" as the fallback because the driver has code logic 
to detect HW sub-types. But I was thinking to give out the PMIC names 
here so anyone who is using the driver could easily identify if the 
driver is suitable for the HW that he/she is using.
> 
>> +
>> +  reg:
>> +    description: address offset of the flash LED controller
>> +    maxItems: 1
>> +
>> +patternProperties:
>> +  "^led@[0-3]$":
>> +    type: object
>> +    $ref: common.yaml#
>> +    unevaluatedProperties: false
>> +    description:
>> +      Represents the physical LED components which are connected to the flash LED channels' output.
> 
> Does not look like wrapped at 80.
> 
> Other places as well.
> Sure, will wrap the lines at 80, I thought not exceeding 110 is also 
acceptable.
>> +
>> +    properties:
> 
> Does not look like you tested the bindings...
> 
> You miss here reg.
> 
will update the node name without using unit name.

>> +      led-sources:
>> +        description: The HW indices of the flash LED channels that connect to the physical LED
>> +        allOf:
>> +          - minItems: 1
>> +            maxItems: 2
>> +            items:
>> +              enum: [1, 2, 3, 4]
>> +
>> +      led-max-microamp:
>> +        description: |
>> +          The maximum current value when LED is not operating in flash mode (i.e. torch mode)
>> +          Valid values when an LED is connected to one flash LED channel:
>> +            5000 - 500000, step by 5000> +          Valid values when an LED is connected to two flash LED
> channels:
>> +            10000 - 1000000, step by 10000
> 
> You need minimum and maximum.
> 
Sure, I will add them
>> +
>> +      flash-max-microamp:
>> +        description: |
>> +          The maximum current value when LED is operating in flash mode.
>> +          Valid values when an LED is connected to one flash LED channel:
>> +            12500 - 1500000, step by 12500
>> +          Valid values when an LED is connected to two flash LED channels:
>> +            25000 - 2000000, step by 12500
> 
> You need minimum and maximum.
Sure, I will add them
> 
> 
>> +
>> +      flash-max-timeout-us:
>> +        description: |
>> +          The maximum timeout value when LED is operating in flash mode.
>> +          Valid values: 10000 - 1280000, step by 10000
> 
> You need minimum and maximum.
> 
>> +
>> +    required:
>> +      - led-sources
>> +      - led-max-microamp
> 
> reg.
> 
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    #include <dt-bindings/leds/common.h>
>> +    flash-led@ee00 {
> 
> Node name: led-controller
> 
>> +            compatible = "qcom,spmi-flash-led";
>> +            reg = <0xee00>;
>> +
>> +            led@0 {
> 
> Test your bindings...
> 
>> +                    function = LED_FUNCTION_FLASH;
> 
> Use 4 spaces for indentation of example.
> 
sure, I will update it.
>> +                    color = <LED_COLOR_ID_WHITE>;
>> +                    led-sources = <1>, <4>;
>> +                    led-max-microamp = <300000>;
>> +                    flash-max-microamp = <2000000>;
>> +                    flash-max-timeout-us = <1280000>;
>> +                    function-enumerator = <0>;
>> +            };
>> +
> 
> Best regards,
> Krzysztof
> 

Re: [PATCH v1 2/2] dt-bindings: add bindings for QCOM flash LED

[Krzysztof Kozlowski]

On 29/09/2022 04:20, Fenglin Wu wrote:
> 
> 
> On 2022/9/28 16:21, Krzysztof Kozlowski wrote:
>> On 28/09/2022 04:42, Fenglin Wu wrote:
>>> Add binding document for flash LED module inside Qualcomm Technologies,
>>> Inc. PMICs.
>>>
>>> Signed-off-by: Fenglin Wu <quic_fenglinw@quicinc.com>
>>
>> You did not Cc me on first patch, so difficult to say how much it
>> matches the driver... There is also no DTS.
> Thanks for reviewing the binding change, I sent the driver changes in 
> the same series and you can check it here:
> https://lore.kernel.org/linux-leds/6c0e5083-baae-3ed3-5eed-e08bbb9e7576@linaro.org/T/#m97f71ce3f291f62d65f8107352d8ab9507093ab2
> 
> I will add you in email to list when sending next patchset.

Don't add just mine. Use instead scripts/get_maintainers.pl. For small
patchsets recipients should get everything. For big patchsets it is
usually split, where everyone receive only cover letter. It's not the
case here...

>>
>>> ---
>>>   .../bindings/leds/leds-qcom-flash.yaml        | 108 ++++++++++++++++++
>>>   1 file changed, 108 insertions(+)
>>>   create mode 100644 Documentation/devicetree/bindings/leds/leds-qcom-flash.yaml
>>>
>>> diff --git a/Documentation/devicetree/bindings/leds/leds-qcom-flash.yaml b/Documentation/devicetree/bindings/leds/leds-qcom-flash.yaml
>>> new file mode 100644
>>> index 000000000000..52a99182961b
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/leds/leds-qcom-flash.yaml
>>
>>
>> Filename matching compatible if there is one fallback (e.g.
>> qcom,spmi-flash-led.yaml).
>>
> Sure, I will update the file name to match with the fallback compatible 
> string.
>>> @@ -0,0 +1,108 @@
>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>> +%YAML 1.2
>>> +---
>>> +$id: http://devicetree.org/schemas/leds/leds-qcom-flash.yaml#
>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>> +
>>> +title: Flash LED device inside Qualcomm Technologies, Inc. PMICs
>>> +
>>> +maintainers:
>>> +  - Fenglin Wu <quic_fenglinw@quicinc.com>
>>> +
>>> +description: |
>>> +  Flash LED controller is present inside some Qualcomm Technologies, Inc. PMICs.
>>> +  The flash LED module can have different number of LED channels supported
>>> +  e.g. 3 or 4. There are some different registers between them but they can
>>> +  both support maximum current up to 1.5 A per channel and they can also support
>>> +  ganging 2 channels together to supply maximum current up to 2 A. The current
>>> +  will be split symmetrically on each channel and they will be enabled and
>>> +  disabled at the same time.
>>> +
>>> +properties:
>>> +  compatible:
>>> +    items:
>>> +      - enum:
>>> +          - qcom,spmi-flash-led
>>> +          - qcom,pm8150c-flash-led
>>> +          - qcom,pm8150l-flash-led
>>> +          - qcom,pm8350c-flash-led
>>
>> I doubt these are all different. You should use fallback, which also
>> will make use of the "items" you used...
> pm8150c and pm8150l are different PMIC variants which have same flash 
> LED module with 3 flash LED channels, while pm8350c has a different 
> flash LED module with 4 flash LED channels. They can all use 
> "qcom,spmi-flash-led" as the fallback because the driver has code logic 
> to detect HW sub-types. 

If driver binds to only one compatible, it is expected to be the
fallback for all others. There might be exception for this rule but it
does not look like here.

> But I was thinking to give out the PMIC names 
> here so anyone who is using the driver could easily identify if the 
> driver is suitable for the HW that he/she is using.

I did not say to remove other compatibles, but to use one fallback for
all of them.

Best regards,
Krzysztof

Re: [PATCH v1 2/2] dt-bindings: add bindings for QCOM flash LED

[Fenglin Wu]

On 2022/9/29 15:06, Krzysztof Kozlowski wrote:
> On 29/09/2022 04:20, Fenglin Wu wrote:
>>
>>
>> On 2022/9/28 16:21, Krzysztof Kozlowski wrote:
>>> On 28/09/2022 04:42, Fenglin Wu wrote:
>>>> Add binding document for flash LED module inside Qualcomm Technologies,
>>>> Inc. PMICs.
>>>>
>>>> Signed-off-by: Fenglin Wu <quic_fenglinw@quicinc.com>
>>>
>>> You did not Cc me on first patch, so difficult to say how much it
>>> matches the driver... There is also no DTS.
>> Thanks for reviewing the binding change, I sent the driver changes in
>> the same series and you can check it here:
>> https://lore.kernel.org/linux-leds/6c0e5083-baae-3ed3-5eed-e08bbb9e7576@linaro.org/T/#m97f71ce3f291f62d65f8107352d8ab9507093ab2
>>
>> I will add you in email to list when sending next patchset.
> 
> Don't add just mine. Use instead scripts/get_maintainers.pl. For small
> patchsets recipients should get everything. For big patchsets it is
> usually split, where everyone receive only cover letter. It's not the
> case here...
> 
Thanks for the suggestion.
I actually used scripts/get_maintainers.pl when pushing the patches. I 
will double check it when sending v2.
Thanks
>>>
>>>> ---
>>>>    .../bindings/leds/leds-qcom-flash.yaml        | 108 ++++++++++++++++++
>>>>    1 file changed, 108 insertions(+)
>>>>    create mode 100644 Documentation/devicetree/bindings/leds/leds-qcom-flash.yaml
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/leds/leds-qcom-flash.yaml b/Documentation/devicetree/bindings/leds/leds-qcom-flash.yaml
>>>> new file mode 100644
>>>> index 000000000000..52a99182961b
>>>> --- /dev/null
>>>> +++ b/Documentation/devicetree/bindings/leds/leds-qcom-flash.yaml
>>>
>>>
>>> Filename matching compatible if there is one fallback (e.g.
>>> qcom,spmi-flash-led.yaml).
>>>
>> Sure, I will update the file name to match with the fallback compatible
>> string.
>>>> @@ -0,0 +1,108 @@
>>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>>> +%YAML 1.2
>>>> +---
>>>> +$id: http://devicetree.org/schemas/leds/leds-qcom-flash.yaml#
>>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>>> +
>>>> +title: Flash LED device inside Qualcomm Technologies, Inc. PMICs
>>>> +
>>>> +maintainers:
>>>> +  - Fenglin Wu <quic_fenglinw@quicinc.com>
>>>> +
>>>> +description: |
>>>> +  Flash LED controller is present inside some Qualcomm Technologies, Inc. PMICs.
>>>> +  The flash LED module can have different number of LED channels supported
>>>> +  e.g. 3 or 4. There are some different registers between them but they can
>>>> +  both support maximum current up to 1.5 A per channel and they can also support
>>>> +  ganging 2 channels together to supply maximum current up to 2 A. The current
>>>> +  will be split symmetrically on each channel and they will be enabled and
>>>> +  disabled at the same time.
>>>> +
>>>> +properties:
>>>> +  compatible:
>>>> +    items:
>>>> +      - enum:
>>>> +          - qcom,spmi-flash-led
>>>> +          - qcom,pm8150c-flash-led
>>>> +          - qcom,pm8150l-flash-led
>>>> +          - qcom,pm8350c-flash-led
>>>
>>> I doubt these are all different. You should use fallback, which also
>>> will make use of the "items" you used...
>> pm8150c and pm8150l are different PMIC variants which have same flash
>> LED module with 3 flash LED channels, while pm8350c has a different
>> flash LED module with 4 flash LED channels. They can all use
>> "qcom,spmi-flash-led" as the fallback because the driver has code logic
>> to detect HW sub-types.
> 
> If driver binds to only one compatible, it is expected to be the
> fallback for all others. There might be exception for this rule but it
> does not look like here.
> 
>> But I was thinking to give out the PMIC names
>> here so anyone who is using the driver could easily identify if the
>> driver is suitable for the HW that he/she is using.
> 
> I did not say to remove other compatibles, but to use one fallback for
> all of them.
> 
Do you mean to update it similar to this?

compatible:
   items:
     - enum:
         - qcom,pm8150c-flash-led
         - qcom,pm8150l-flash-led
         - qcom,pm8350c-flash-led
     - const:
         - qcom,spmi-flash-led

> Best regards,
> Krzysztof
> 

Re: [PATCH v1 2/2] dt-bindings: add bindings for QCOM flash LED

[Krzysztof Kozlowski]

On 29/09/2022 12:56, Fenglin Wu wrote:
>> If driver binds to only one compatible, it is expected to be the
>> fallback for all others. There might be exception for this rule but it
>> does not look like here.
>>
>>> But I was thinking to give out the PMIC names
>>> here so anyone who is using the driver could easily identify if the
>>> driver is suitable for the HW that he/she is using.
>>
>> I did not say to remove other compatibles, but to use one fallback for
>> all of them.
>>
> Do you mean to update it similar to this?
> 
> compatible:
>    items:
>      - enum:
>          - qcom,pm8150c-flash-led
>          - qcom,pm8150l-flash-led
>          - qcom,pm8350c-flash-led
>      - const:
>          - qcom,spmi-flash-led

Yes, just const is not a list, so "const: qcom,spmi-flash-led"

Best regards,
Krzysztof

Re: [PATCH v1 2/2] dt-bindings: add bindings for QCOM flash LED

[Rob Herring]

On Wed, 28 Sep 2022 10:42:39 +0800, Fenglin Wu wrote:
> Add binding document for flash LED module inside Qualcomm Technologies,
> Inc. PMICs.
> 
> Signed-off-by: Fenglin Wu <quic_fenglinw@quicinc.com>
> ---
>  .../bindings/leds/leds-qcom-flash.yaml        | 108 ++++++++++++++++++
>  1 file changed, 108 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/leds/leds-qcom-flash.yaml
> 

My bot found errors running 'make DT_CHECKER_FLAGS=-m dt_binding_check'
on your patch (DT_CHECKER_FLAGS is new in v5.13):

yamllint warnings/errors:

dtschema/dtc warnings/errors:
Documentation/devicetree/bindings/leds/leds-qcom-flash.example.dts:21.17-32: Warning (reg_format): /example-0/flash-led@ee00:reg: property has invalid length (4 bytes) (#address-cells == 1, #size-cells == 1)
Documentation/devicetree/bindings/leds/leds-qcom-flash.example.dts:23.23-31.19: Warning (unit_address_vs_reg): /example-0/flash-led@ee00/led@0: node has a unit name, but no reg or ranges property
Documentation/devicetree/bindings/leds/leds-qcom-flash.example.dts:33.23-41.19: Warning (unit_address_vs_reg): /example-0/flash-led@ee00/led@1: node has a unit name, but no reg or ranges property
Documentation/devicetree/bindings/leds/leds-qcom-flash.example.dtb: Warning (pci_device_reg): Failed prerequisite 'reg_format'
Documentation/devicetree/bindings/leds/leds-qcom-flash.example.dtb: Warning (pci_device_bus_num): Failed prerequisite 'reg_format'
Documentation/devicetree/bindings/leds/leds-qcom-flash.example.dtb: Warning (simple_bus_reg): Failed prerequisite 'reg_format'
Documentation/devicetree/bindings/leds/leds-qcom-flash.example.dtb: Warning (i2c_bus_reg): Failed prerequisite 'reg_format'
Documentation/devicetree/bindings/leds/leds-qcom-flash.example.dtb: Warning (spi_bus_reg): Failed prerequisite 'reg_format'

doc reference errors (make refcheckdocs):

See https://patchwork.ozlabs.org/patch/

This check can fail if there are any dependencies. The base for a patch
series is generally the most recent rc1.

If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure 'yamllint' is installed and dt-schema is up to
date:

pip3 install dtschema --upgrade

Please check and re-submit.