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backlight: pm8941-wled: Add default-brightness property 

Default the brightness to 2048 and add possibility to override this in
device tree.

Suggested-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Bjorn Andersson 2015-10-26 10:45:08 -07:00 committed by Lee Jones
parent fc18111b89
commit 9d6c243502
2 changed files with 10 additions and 0 deletions
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2
Documentation/devicetree/bindings/video/backlight/pm8941-wled.txt
View File

@ -5,6 +5,8 @@ Required properties:
- reg: slave address
Optional properties:
- default-brightness: brightness value on boot, value from: 0-4095
default: 2048
- label: The name of the backlight device
- qcom,cs-out: bool; enable current sink output
- qcom,cabc: bool; enable content adaptive backlight control

8
drivers/video/backlight/pm8941-wled.c
View File

@ -17,6 +17,9 @@
#include <linux/of_device.h>
#include <linux/regmap.h>
/* From DT binding */
#define PM8941_WLED_DEFAULT_BRIGHTNESS 2048
#define PM8941_WLED_REG_VAL_BASE 0x40
#define PM8941_WLED_REG_VAL_MAX 0xFFF
@ -373,6 +376,7 @@ static int pm8941_wled_probe(struct platform_device *pdev)
struct backlight_device *bl;
struct pm8941_wled *wled;
struct regmap *regmap;
u32 val;
int rc;
regmap = dev_get_regmap(pdev->dev.parent, NULL);
@ -395,8 +399,12 @@ static int pm8941_wled_probe(struct platform_device *pdev)
if (rc)
return rc;
val = PM8941_WLED_DEFAULT_BRIGHTNESS;
of_property_read_u32(pdev->dev.of_node, "default-brightness", &val);
memset(&props, 0, sizeof(struct backlight_properties));
props.type = BACKLIGHT_RAW;
props.brightness = val;
props.max_brightness = PM8941_WLED_REG_VAL_MAX;
bl = devm_backlight_device_register(&pdev->dev, wled->name,
&pdev->dev, wled,