[PATCH v5 14/14] video: leds: backlight: lm3533: Support getting LED sources from DT

[Svyatoslav Ryhel]

Add Control Bank to HVLED/LVLED muxing support based on the led-sources
defined in the device tree.

Signed-off-by: Svyatoslav Ryhel <clamor95@xxxxxxxxx>
---
 drivers/leds/leds-lm3533.c          | 60 +++++++++++++++++++++++++++++
 drivers/video/backlight/lm3533_bl.c | 45 ++++++++++++++++++++++
 2 files changed, 105 insertions(+)

diff --git a/drivers/leds/leds-lm3533.c b/drivers/leds/leds-lm3533.c
index ed810c23f30f..9e07953814fd 100644
--- a/drivers/leds/leds-lm3533.c
+++ b/drivers/leds/leds-lm3533.c
@@ -27,6 +27,11 @@
 #define LM3533_ALS_CHANNEL_LV_MIN	1
 #define LM3533_ALS_CHANNEL_LV_MAX	2
 
+#define LM3533_REG_OUTPUT_CONF1			0x10
+#define   OUTPUT_CONF1_SHIFT			2
+#define   OUTPUT_LVLED_MASK			0x3
+#define LM3533_REG_OUTPUT_CONF2			0x11
+#define   OUTPUT_CONF2_SHIFT			6
 #define LM3533_REG_CTRLBANK_BCONF_BASE		0x1b
 #define LM3533_REG_PATTERN_ENABLE		0x28
 #define LM3533_REG_PATTERN_LOW_TIME_BASE	0x71
@@ -55,6 +60,9 @@ struct lm3533_led {
 	u32 max_current;
 	u32 pwm;
 
+	int num_leds;
+	u32 leds[LM3533_LVCTRLBANK_MAX];
+
 	bool have_als;
 };
 
@@ -623,8 +631,36 @@ static const struct attribute_group *lm3533_led_attribute_groups[] = {
 
 static int lm3533_led_setup(struct lm3533_led *led)
 {
+	u32 output_cfg_shift = 0;
+	u32 output_cfg_val = 0;
+	u32 output_cfg_mask = 0;
 	int ret;
 
+	if (led->num_leds) {
+		for (int i = 0; i < led->num_leds; i++) {
+			if (led->leds[i] >= LM3533_LVCTRLBANK_MAX)
+				continue;
+
+			output_cfg_shift = led->leds[i] * 2;
+			output_cfg_val |= led->id << output_cfg_shift;
+			output_cfg_mask |= OUTPUT_LVLED_MASK << output_cfg_shift;
+		}
+
+		/* LVLED1, LVLED2 and LVLED3 */
+		ret = regmap_update_bits(led->regmap, LM3533_REG_OUTPUT_CONF1,
+					 output_cfg_mask << OUTPUT_CONF1_SHIFT,
+					 output_cfg_val << OUTPUT_CONF1_SHIFT);
+		if (ret)
+			return ret;
+
+		/* LVLED4 and LVLED5 */
+		ret = regmap_update_bits(led->regmap, LM3533_REG_OUTPUT_CONF2,
+					 output_cfg_mask >> OUTPUT_CONF2_SHIFT,
+					 output_cfg_val >> OUTPUT_CONF2_SHIFT);
+		if (ret)
+			return ret;
+	}
+
 	ret = lm3533_ctrlbank_set_max_current(&led->cb, led->max_current);
 	if (ret)
 		return ret;
@@ -699,6 +735,30 @@ static int lm3533_led_probe(struct platform_device *pdev)
 
 	device_property_read_u32(&pdev->dev, "ti,pwm-config-mask", &led->pwm);
 
+	/*
+	 * If led-sources property is not set then either this Control Bank uses
+	 * its default LVLED or is not linked to any LVLED at all.
+	 */
+	led->num_leds = device_property_count_u32(&pdev->dev, "led-sources");
+	if (led->num_leds > LM3533_LVCTRLBANK_MAX) {
+		dev_err(&pdev->dev, "num of LED sources exceeds max %d: %d\n",
+			LM3533_LVCTRLBANK_MAX, led->num_leds);
+		ret = -EINVAL;
+		goto err_deregister;
+	}
+
+	if (led->num_leds < 0)
+		led->num_leds = 0;
+
+	if (led->num_leds > 0) {
+		ret = device_property_read_u32_array(&pdev->dev, "led-sources",
+						     led->leds, led->num_leds);
+		if (ret) {
+			dev_err(&pdev->dev, "failed to get led-sources\n");
+			goto err_deregister;
+		}
+	}
+
 	ret = lm3533_led_setup(led);
 	if (ret)
 		goto err_deregister;
diff --git a/drivers/video/backlight/lm3533_bl.c b/drivers/video/backlight/lm3533_bl.c
index c99fc68cb669..b3e5b3042d34 100644
--- a/drivers/video/backlight/lm3533_bl.c
+++ b/drivers/video/backlight/lm3533_bl.c
@@ -7,6 +7,7 @@
  * Author: Johan Hovold <jhovold@xxxxxxxxx>
  */
 
+#include <linux/bits.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/mod_devicetable.h>
@@ -22,6 +23,7 @@
 #define LM3533_HVCTRLBANK_COUNT		2
 #define LM3533_BL_MAX_BRIGHTNESS	255
 
+#define LM3533_REG_OUTPUT_CONF1		0x10
 #define LM3533_REG_CTRLBANK_AB_BCONF	0x1a
 #define   CTRLBANK_AB_BCONF_ALS(n)	BIT(2 * (n))
 #define   CTRLBANK_AB_BCONF_MODE(n)	BIT(2 * (n) + 1)
@@ -36,6 +38,9 @@ struct lm3533_bl {
 	u32 max_current;
 	u32 pwm;
 
+	int num_leds;
+	u32 led_strings[LM3533_HVCTRLBANK_COUNT];
+
 	bool have_als;
 	bool linear;
 };
@@ -237,6 +242,8 @@ static const struct attribute_group *lm3533_bl_attribute_groups[] = {
 static int lm3533_bl_setup(struct lm3533_bl *bl)
 {
 	int ctrlbank = lm3533_bl_get_ctrlbank_id(bl);
+	u32 output_cfg_val = 0;
+	u32 output_cfg_mask = 0;
 	int ret;
 
 	ret = regmap_assign_bits(bl->regmap, LM3533_REG_CTRLBANK_AB_BCONF,
@@ -244,6 +251,21 @@ static int lm3533_bl_setup(struct lm3533_bl *bl)
 	if (ret)
 		return ret;
 
+	if (bl->num_leds) {
+		for (int i = 0; i < bl->num_leds; i++) {
+			if (bl->led_strings[i] >= LM3533_HVCTRLBANK_COUNT)
+				continue;
+
+			output_cfg_val |= ctrlbank << bl->led_strings[i];
+			output_cfg_mask |= BIT(bl->led_strings[i]);
+		}
+
+		ret = regmap_update_bits(bl->regmap, LM3533_REG_OUTPUT_CONF1,
+					 output_cfg_mask, output_cfg_val);
+		if (ret)
+			return ret;
+	}
+
 	ret = lm3533_ctrlbank_set_max_current(&bl->cb, bl->max_current);
 	if (ret)
 		return ret;
@@ -321,6 +343,29 @@ static int lm3533_bl_probe(struct platform_device *pdev)
 
 	device_property_read_u32(&pdev->dev, "ti,pwm-config-mask", &bl->pwm);
 
+	/*
+	 * If led-sources property is not set then either this Control Bank uses
+	 * its default HVLED or is not linked to any HVLED at all.
+	 */
+	bl->num_leds = device_property_count_u32(&pdev->dev, "led-sources");
+	if (bl->num_leds > LM3533_HVCTRLBANK_COUNT) {
+		dev_err(&pdev->dev, "num of LED sources %d exceeds max %d\n",
+			bl->num_leds, LM3533_HVCTRLBANK_COUNT);
+		return -EINVAL;
+	}
+
+	if (bl->num_leds < 0)
+		bl->num_leds = 0;
+
+	if (bl->num_leds > 0) {
+		ret = device_property_read_u32_array(&pdev->dev, "led-sources",
+						     bl->led_strings,
+						     bl->num_leds);
+		if (ret)
+			return dev_err_probe(&pdev->dev, ret,
+					     "failed to get led-sources\n");
+	}
+
 	ret = lm3533_bl_setup(bl);
 	if (ret)
 		return ret;
-- 
2.53.0