[PATCH v4 12/14] video: backlight: lm3533_bl: Set initial mapping mode from DT

[Svyatoslav Ryhel <clamor95@gmail.com>]

Add support to obtain the initial mapping mode from DT instead of leaving
it unconfigured.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Reviewed-by: Daniel Thompson (RISCstar) <danielt@kernel.org>
---
 drivers/video/backlight/lm3533_bl.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/video/backlight/lm3533_bl.c b/drivers/video/backlight/lm3533_bl.c
index 9ad7ea1bbbcc..4f8cde9f290d 100644
--- a/drivers/video/backlight/lm3533_bl.c
+++ b/drivers/video/backlight/lm3533_bl.c
@@ -37,6 +37,7 @@ struct lm3533_bl {
 	u32 pwm;
 
 	bool have_als;
+	bool linear;
 };
 
 
@@ -226,8 +227,14 @@ static struct attribute_group lm3533_bl_attribute_group = {
 
 static int lm3533_bl_setup(struct lm3533_bl *bl)
 {
+	int ctrlbank = lm3533_bl_get_ctrlbank_id(bl);
 	int ret;
 
+	ret = regmap_assign_bits(bl->regmap, LM3533_REG_CTRLBANK_AB_BCONF,
+				 CTRLBANK_AB_BCONF_MODE(ctrlbank), bl->linear);
+	if (ret)
+		return ret;
+
 	ret = lm3533_ctrlbank_set_max_current(&bl->cb, bl->max_current);
 	if (ret)
 		return ret;
@@ -281,6 +288,9 @@ static int lm3533_bl_probe(struct platform_device *pdev)
 	props.max_brightness = LM3533_BL_MAX_BRIGHTNESS;
 	props.brightness = default_brightness;
 
+	bl->linear = device_property_read_bool(&pdev->dev,
+					       "ti,linear-mapping-mode");
+
 	bd = devm_backlight_device_register(&pdev->dev, name, &pdev->dev,
 					    bl, &lm3533_bl_ops, &props);
 	if (IS_ERR(bd)) {
-- 
2.53.0