leds: lm3692x: Allow to set ovp and brigthness mode

index 8b408102e138..28973cc5a6cc 100644
@@ -114,6 +114,8 @@ struct lm3692x_led {
 	struct regulator *regulator;
 	int led_enable;
 	int model_id;
+
+	u8 boost_ctrl;
 };
 
 static const struct reg_default lm3692x_reg_defs[] = {

@@ -249,10 +251,7 @@ static int lm3692x_init(struct lm3692x_led *led)
 	if (ret)
 		goto out;
 
-	ret = regmap_write(led->regmap, LM3692X_BOOST_CTRL,
-			LM3692X_BOOST_SW_1MHZ |
-			LM3692X_BOOST_SW_NO_SHIFT |
-			LM3692X_OCP_PROT_1_5A);
+	ret = regmap_write(led->regmap, LM3692X_BOOST_CTRL, led->boost_ctrl);
 	if (ret)
 		goto out;
 

@@ -326,6 +325,7 @@ static int lm3692x_probe_dt(struct lm3692x_led *led)
 {
 	struct fwnode_handle *child = NULL;
 	struct led_init_data init_data = {};
+	u32 ovp;
 	int ret;
 
 	led->enable_gpio = devm_gpiod_get_optional(&led->client->dev,

@@ -350,6 +350,32 @@ static int lm3692x_probe_dt(struct lm3692x_led *led)
 		led->regulator = NULL;
 	}
 
+	led->boost_ctrl = LM3692X_BOOST_SW_1MHZ |
+		LM3692X_BOOST_SW_NO_SHIFT |
+		LM3692X_OCP_PROT_1_5A;
+	ret = device_property_read_u32(&led->client->dev,
+				       "ti,ovp-microvolt", &ovp);
+	if (ret) {
+		led->boost_ctrl |= LM3692X_OVP_29V;
+	} else {
+		switch (ovp) {
+		case 17000000:
+			break;
+		case 21000000:
+			led->boost_ctrl |= LM3692X_OVP_21V;
+			break;
+		case 25000000:
+			led->boost_ctrl |= LM3692X_OVP_25V;
+			break;
+		case 29000000:
+			led->boost_ctrl |= LM3692X_OVP_29V;
+			break;
+		default:
+			dev_err(&led->client->dev, "Invalid OVP %d\n", ovp);
+			return -EINVAL;
+		}
+	}
+
 	child = device_get_next_child_node(&led->client->dev, child);
 	if (!child) {
 		dev_err(&led->client->dev, "No LED Child node\n");

index 28973cc5a6cc..ff20560a8263 100644
@@ -115,7 +115,7 @@ struct lm3692x_led {
 	int led_enable;
 	int model_id;
 
-	u8 boost_ctrl;
+	u8 boost_ctrl, brightness_ctrl;
 };
 
 static const struct reg_default lm3692x_reg_defs[] = {

@@ -267,8 +267,7 @@ static int lm3692x_init(struct lm3692x_led *led)
 	if (ret)
 		goto out;
 
-	ret = regmap_write(led->regmap, LM3692X_BRT_CTRL,
-			LM3692X_BL_ADJ_POL | LM3692X_RAMP_EN);
+	ret = regmap_write(led->regmap, LM3692X_BRT_CTRL, led->brightness_ctrl);
 	if (ret)
 		goto out;
 

@@ -326,6 +325,7 @@ static int lm3692x_probe_dt(struct lm3692x_led *led)
 	struct fwnode_handle *child = NULL;
 	struct led_init_data init_data = {};
 	u32 ovp;
+	bool exp_mode;
 	int ret;
 
 	led->enable_gpio = devm_gpiod_get_optional(&led->client->dev,

@@ -376,6 +376,12 @@ static int lm3692x_probe_dt(struct lm3692x_led *led)
 		}
 	}
 
+	led->brightness_ctrl = LM3692X_BL_ADJ_POL | LM3692X_RAMP_EN;
+	exp_mode = device_property_read_bool(&led->client->dev,
+				     "ti,brightness-mapping-exponential");
+	if (exp_mode)
+		led->brightness_ctrl |= LM3692X_MAP_MODE_EXP;
+
 	child = device_get_next_child_node(&led->client->dev, child);
 	if (!child) {
 		dev_err(&led->client->dev, "No LED Child node\n");

index ff20560a8263..d7e5de8fe8db 100644
@@ -6,6 +6,7 @@
 #include <linux/i2c.h>
 #include <linux/init.h>
 #include <linux/leds.h>
+#include <linux/log2.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/of.h>

@@ -320,11 +321,29 @@ static int lm3692x_init(struct lm3692x_led *led)
 	return ret;
 }
 
+static enum led_brightness lm3692x_max_brightness(struct lm3692x_led *led,
+						  u32 max_cur)
+{
+	u32 max_code;
+
+	/* see p.12 of LM36922 data sheet for brightness formula */
+	if (led->brightness_ctrl & LM3692X_MAP_MODE_EXP) {
+		/*  228 =~ 1.0 / log2(1.003040572) */
+		max_code = ilog2(max_cur/50) * 228;
+	} else {
+		max_code = ((max_cur * 1000) - 37806) / 12195;
+	}
+	if (max_code > 0x7FF)
+		max_code = 0x7FF;
+
+	return max_code >> 3;
+}
+
 static int lm3692x_probe_dt(struct lm3692x_led *led)
 {
 	struct fwnode_handle *child = NULL;
 	struct led_init_data init_data = {};
-	u32 ovp;
+	u32 ovp, max_cur;
 	bool exp_mode;
 	int ret;
 

@@ -397,6 +416,10 @@ static int lm3692x_probe_dt(struct lm3692x_led *led)
 		return ret;
 	}
 
+	fwnode_property_read_u32(child, "led-max-microamp", &max_cur);
+	led->led_dev.max_brightness = ret ? LED_FULL :
+		lm3692x_max_brightness(led, max_cur);
+
 	init_data.fwnode = child;
 	init_data.devicename = led->client->name;
 	init_data.default_label = ":";