linux-kernel - Re: [RESEND PATCH v2] backlight: pm8941-wled: Add default-brightness property

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Date:	Tue, 27 Oct 2015 02:45:30 -0500
From:	Rob Herring <robh+dt@...nel.org>
To:	Bjorn Andersson <bjorn.andersson@...ymobile.com>
Cc:	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Jingoo Han <jingoohan1@...il.com>,
	Lee Jones <lee.jones@...aro.org>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Rob Clark <robdclark@...il.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
	linux-arm-msm <linux-arm-msm@...r.kernel.org>
Subject: Re: [RESEND PATCH v2] backlight: pm8941-wled: Add default-brightness property

On Mon, Oct 26, 2015 at 12:45 PM, Bjorn Andersson
<bjorn.andersson@...ymobile.com> wrote:
> Default the brightness to 2048 and add possibility to override this in
> device tree.
>
> Suggested-by: Rob Clark <robdclark@...il.com>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...ymobile.com>
> ---
>
> Resend of v2, with updated backlight dt binding location.

Acked-by: Rob Herring <robh@...nel.org>

>
>  Documentation/devicetree/bindings/leds/backlight/pm8941-wled.txt | 2 ++
>  drivers/video/backlight/pm8941-wled.c                            | 8 ++++++++
>  2 files changed, 10 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/leds/backlight/pm8941-wled.txt b/Documentation/devicetree/bindings/leds/backlight/pm8941-wled.txt
> index 424f8444a6cd..e5b294dafc58 100644
> --- a/Documentation/devicetree/bindings/leds/backlight/pm8941-wled.txt
> +++ b/Documentation/devicetree/bindings/leds/backlight/pm8941-wled.txt
> @@ -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
> diff --git a/drivers/video/backlight/pm8941-wled.c b/drivers/video/backlight/pm8941-wled.c
> index c704c3236034..e1298147bcbb 100644
> --- a/drivers/video/backlight/pm8941-wled.c
> +++ b/drivers/video/backlight/pm8941-wled.c
> @@ -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,
> --
> 2.4.2
>
--
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