linux-kernel - Re: [PATCH 1/2] backlight: gpio_backlight: add new property default-brightness-level

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Date:   Fri, 26 May 2023 11:27:08 +0100
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     Alexandru Ardelean <alex@...uggie.ro>
Cc:     dri-devel@...ts.freedesktop.org, linux-leds@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-fbdev@...r.kernel.org, lee@...nel.org, jingoohan1@...il.com,
        pavel@....cz, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        deller@....de, Yannick Fertre <yannick.fertre@...s.st.com>,
        Philippe CORNU <philippe.cornu@...s.st.com>
Subject: Re: [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@...s.st.com>
>
> Add new property to set a brightness by default at probe.
>
> Reviewed-by: Philippe CORNU <philippe.cornu@...s.st.com>
> Signed-off-by: Yannick Fertre <yannick.fertre@...s.st.com>
> Signed-off-by: Alexandru Ardelean <alex@...uggie.ro>

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