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SubjectRe: [PATCH 1/2] backlight: gpio_backlight: add new property default-brightness-level
On Fri, May 19, 2023 at 11:05:19PM +0300, Alexandru Ardelean wrote:
> From: Yannick Fertre <yannick.fertre@foss.st.com>
>
> Add new property to set a brightness by default at probe.
>
> Reviewed-by: Philippe CORNU <philippe.cornu@foss.st.com>
> Signed-off-by: Yannick Fertre <yannick.fertre@foss.st.com>
> Signed-off-by: Alexandru Ardelean <alex@shruggie.ro>

Patch order should be reversed for v2. Nevertheless:
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>


Daniel.

> struct backlight_device *bl;
> struct gpio_backlight *gbl;
> int ret, init_brightness, def_value;
> + u32 value;
>
> gbl = devm_kzalloc(dev, sizeof(*gbl), GFP_KERNEL);
> if (gbl == NULL)
> @@ -93,7 +94,11 @@ static int gpio_backlight_probe(struct platform_device *pdev)
> else
> bl->props.power = FB_BLANK_UNBLANK;
>
> - bl->props.brightness = 1;
> + ret = device_property_read_u32(dev, "default-brightness-level", &value);
> + if (!ret && value <= props.max_brightness)
> + bl->props.brightness = value;
> + else
> + bl->props.brightness = 1;
>
> init_brightness = backlight_get_brightness(bl);
> ret = gpiod_direction_output(gbl->gpiod, init_brightness);
> --
> 2.40.1
>

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