Merge tag 'backlight-next-5.20' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight

Pull backlight updates from Lee Jones:
 "Core Framework:
   - Change maintainer email address

  Fix-ups:
   - Obtain OCP level from Device Tree; rt4831-backlight
   - DT fix-ups/conversions; richtek,rt4831-backlight
   - Remove unused code / functionatlity; platform_lcd
   - Switch to atomic PWM API; lp855x_bl

* tag 'backlight-next-5.20' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight:
  MAINTAINERS: Use Lee Jones' kernel.org address for Backlight submissions
  backlight: lp855x: Switch to atomic PWM API
  dt-bindings: backlight: Update Lee Jones' email address
  Revert "drivers/video/backlight/platform_lcd.c: add support for device tree based probe"
  backlight: rt4831: Apply ocp level from devicetree
  dt-bindings: backlight: rt4831: Add the new ocp level property

3 files changed, 41 insertions, 23 deletions

diff --git a/drivers/video/backlight/lp855x_bl.c b/drivers/video/backlight/lp855x_bl.c
index 2b9e2bbbb03e..fc02c5c16055 100644
--- a/drivers/video/backlight/lp855x_bl.c
+++ b/drivers/video/backlight/lp855x_bl.c
@@ -218,9 +218,8 @@ err:
 
 static void lp855x_pwm_ctrl(struct lp855x *lp, int br, int max_br)
 {
-	unsigned int period = lp->pdata->period_ns;
-	unsigned int duty = br * period / max_br;
 	struct pwm_device *pwm;
+	struct pwm_state state;
 
 	/* request pwm device with the consumer name */
 	if (!lp->pwm) {
@@ -230,18 +229,16 @@ static void lp855x_pwm_ctrl(struct lp855x *lp, int br, int max_br)
 
 		lp->pwm = pwm;
 
-		/*
-		 * FIXME: pwm_apply_args() should be removed when switching to
-		 * the atomic PWM API.
-		 */
-		pwm_apply_args(pwm);
+		pwm_init_state(lp->pwm, &state);
+	} else {
+		pwm_get_state(lp->pwm, &state);
 	}
 
-	pwm_config(lp->pwm, duty, period);
-	if (duty)
-		pwm_enable(lp->pwm);
-	else
-		pwm_disable(lp->pwm);
+	state.period = lp->pdata->period_ns;
+	state.duty_cycle = div_u64(br * state.period, max_br);
+	state.enabled = state.duty_cycle;
+
+	pwm_apply_state(lp->pwm, &state);
 }
 
 static int lp855x_bl_update_status(struct backlight_device *bl)
diff --git a/drivers/video/backlight/platform_lcd.c b/drivers/video/backlight/platform_lcd.c
index b2bfbf070200..dc37494baf42 100644
--- a/drivers/video/backlight/platform_lcd.c
+++ b/drivers/video/backlight/platform_lcd.c
@@ -12,7 +12,6 @@
 #include <linux/fb.h>
 #include <linux/backlight.h>
 #include <linux/lcd.h>
-#include <linux/of.h>
 #include <linux/slab.h>
 
 #include <video/platform_lcd.h>
@@ -133,19 +132,10 @@ static int platform_lcd_resume(struct device *dev)
 static SIMPLE_DEV_PM_OPS(platform_lcd_pm_ops, platform_lcd_suspend,
 			platform_lcd_resume);
 
-#ifdef CONFIG_OF
-static const struct of_device_id platform_lcd_of_match[] = {
-	{ .compatible = "platform-lcd" },
-	{},
-};
-MODULE_DEVICE_TABLE(of, platform_lcd_of_match);
-#endif
-
 static struct platform_driver platform_lcd_driver = {
 	.driver		= {
 		.name	= "platform-lcd",
 		.pm	= &platform_lcd_pm_ops,
-		.of_match_table = of_match_ptr(platform_lcd_of_match),
 	},
 	.probe		= platform_lcd_probe,
 };
diff --git a/drivers/video/backlight/rt4831-backlight.c b/drivers/video/backlight/rt4831-backlight.c
index 42155c7d2db1..eb8c59e8713f 100644
--- a/drivers/video/backlight/rt4831-backlight.c
+++ b/drivers/video/backlight/rt4831-backlight.c
@@ -12,6 +12,7 @@
 #define RT4831_REG_BLCFG	0x02
 #define RT4831_REG_BLDIML	0x04
 #define RT4831_REG_ENABLE	0x08
+#define RT4831_REG_BLOPT2	0x11
 
 #define RT4831_BLMAX_BRIGHTNESS	2048
 
@@ -23,6 +24,11 @@
 #define RT4831_BLDIML_MASK	GENMASK(2, 0)
 #define RT4831_BLDIMH_MASK	GENMASK(10, 3)
 #define RT4831_BLDIMH_SHIFT	3
+#define RT4831_BLOCP_MASK	GENMASK(1, 0)
+
+#define RT4831_BLOCP_MINUA	900000
+#define RT4831_BLOCP_MAXUA	1800000
+#define RT4831_BLOCP_STEPUA	300000
 
 struct rt4831_priv {
 	struct device *dev;
@@ -85,7 +91,7 @@ static int rt4831_parse_backlight_properties(struct rt4831_priv *priv,
 {
 	struct device *dev = priv->dev;
 	u8 propval;
-	u32 brightness;
+	u32 brightness, ocp_uA;
 	unsigned int val = 0;
 	int ret;
 
@@ -120,6 +126,31 @@ static int rt4831_parse_backlight_properties(struct rt4831_priv *priv,
 	if (ret)
 		return ret;
 
+	/*
+	 * This OCP level is used to protect and limit the inductor current.
+	 * If inductor peak current reach the level, low-side MOSFET will be
+	 * turned off. Meanwhile, the output channel current may be limited.
+	 * To match the configured channel current, the inductor chosen must
+	 * be higher than the OCP level.
+	 *
+	 * Not like the OVP level, the default 21V can be used in the most
+	 * application. But if the chosen OCP level is smaller than needed,
+	 * it will also affect the backlight channel output current to be
+	 * smaller than the register setting.
+	 */
+	ret = device_property_read_u32(dev, "richtek,bled-ocp-microamp",
+				       &ocp_uA);
+	if (!ret) {
+		ocp_uA = clamp_val(ocp_uA, RT4831_BLOCP_MINUA,
+				   RT4831_BLOCP_MAXUA);
+		val = DIV_ROUND_UP(ocp_uA - RT4831_BLOCP_MINUA,
+				   RT4831_BLOCP_STEPUA);
+		ret = regmap_update_bits(priv->regmap, RT4831_REG_BLOPT2,
+					 RT4831_BLOCP_MASK, val);
+		if (ret)
+			return ret;
+	}
+
 	ret = device_property_read_u8(dev, "richtek,channel-use", &propval);
 	if (ret) {
 		dev_err(dev, "richtek,channel-use DT property missing\n");