linux-kernel - [PATCH 2/2] backlight: rt4831: Add the property parsing for ocp level selection

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Date:   Thu, 26 May 2022 11:16:35 +0800
From:   cy_huang <u0084500@...il.com>
To:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        lee.jones@...aro.org, daniel.thompson@...aro.org,
        jingoohan1@...il.com
Cc:     pavel@....cz, deller@....de, cy_huang@...htek.com,
        lucas_tsai@...htek.com, devicetree@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] backlight: rt4831: Add the property parsing for ocp level selection

From: ChiYuan Huang <cy_huang@...htek.com>

Add the property parsing for ocp level selection.

Reported-by: Lucas Tsai <lucas_tsai@...htek.com>
Signed-off-by: ChiYuan Huang <cy_huang@...htek.com>
---
 drivers/video/backlight/rt4831-backlight.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/video/backlight/rt4831-backlight.c b/drivers/video/backlight/rt4831-backlight.c
index 42155c7..c81f7d9 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 +24,8 @@
 #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_SHIFT	0
 
 struct rt4831_priv {
 	struct device *dev;
@@ -120,6 +123,16 @@ static int rt4831_parse_backlight_properties(struct rt4831_priv *priv,
 	if (ret)
 		return ret;
 
+	ret = device_property_read_u8(dev, "richtek,bled-ocp-sel", &propval);
+	if (ret)
+		propval = RT4831_BLOCPLVL_1P2A;
+
+	propval = min_t(u8, propval, RT4831_BLOCPLVL_1P8A);
+	ret = regmap_update_bits(priv->regmap, RT4831_REG_BLOPT2, RT4831_BLOCP_MASK,
+				 propval << RT4831_BLOCP_SHIFT);
+	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");
-- 
2.7.4