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

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Date:	Fri, 24 Jul 2015 09:22:04 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Bjorn Andersson <bjorn.andersson@...ymobile.com>
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Jingoo Han <jingoohan1@...il.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Rob Clark <robdclark@...il.com>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-fbdev@...r.kernel.org,
	linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH] backlight: pm8941-wled: Add default-brightness property

On Thu, 23 Jul 2015, Bjorn Andersson wrote:

> Add the possibility of specifying the default brightness in DT.
> 
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...ymobile.com>
> ---
> 
> This depends on the patch moving pm8941-wled to backlight [1]. The dt property
> is used by several other backlight drivers, so I considered this to be a
> "common" property and it's hence not prefixed with "qcom,".
> 
> [1] https://lkml.org/lkml/2015/7/21/906
> 
>  Documentation/devicetree/bindings/video/backlight/pm8941-wled.txt | 1 +

This needs to be in a seperate patch.

>  drivers/video/backlight/pm8941-wled.c                             | 4 ++++

You can't send patches on top of non-existent drivers.

>  2 files changed, 5 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/video/backlight/pm8941-wled.txt b/Documentation/devicetree/bindings/video/backlight/pm8941-wled.txt
> index 424f8444a6cd..37503f8c3620 100644
> --- a/Documentation/devicetree/bindings/video/backlight/pm8941-wled.txt
> +++ b/Documentation/devicetree/bindings/video/backlight/pm8941-wled.txt
> @@ -5,6 +5,7 @@ Required properties:
>  - reg: slave address
>  
>  Optional properties:
> +- default-brightness: value from: 0-4095
>  - 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..b875e58df0fc 100644
> --- a/drivers/video/backlight/pm8941-wled.c
> +++ b/drivers/video/backlight/pm8941-wled.c
> @@ -373,6 +373,7 @@ static int pm8941_wled_probe(struct platform_device *pdev)
>  	struct backlight_device *bl;
>  	struct pm8941_wled *wled;
>  	struct regmap *regmap;
> +	u32 val = 0;
>  	int rc;
>  
>  	regmap = dev_get_regmap(pdev->dev.parent, NULL);
> @@ -395,8 +396,11 @@ static int pm8941_wled_probe(struct platform_device *pdev)
>  	if (rc)
>  		return rc;
>  
> +	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,

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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