linux-kernel - Re: [PATCH 6/7] mfd: max8925: support dt for backlight

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Date:	Fri, 23 Nov 2012 15:23:21 +0800
From:	Qing Xu <qingx@...vell.com>
To:	Qing Xu <qingx@...vell.com>
Cc:	"rpurdie@...ys.net" <rpurdie@...ys.net>,
	"FlorianSchandinat@....de" <FlorianSchandinat@....de>,
	"sameo@...ux.intel.com" <sameo@...ux.intel.com>,
	"grant.likely@...retlab.ca" <grant.likely@...retlab.ca>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"haojian.zhuang@...il.com" <haojian.zhuang@...il.com>,
	Chao Xie <cxie4@...vell.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>
Subject: Re: [PATCH 6/7] mfd: max8925: support dt for backlight

On 11/06/2012 03:47 PM, Qing Xu wrote:
> From: Qing Xu <qingx@...vell.com>
>
> Signed-off-by: Qing Xu <qingx@...vell.com>
> ---
>   drivers/video/backlight/max8925_bl.c |   31 ++++++++++++++++++++++++++++++-
>   1 files changed, 30 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/video/backlight/max8925_bl.c b/drivers/video/backlight/max8925_bl.c
> index f72ba54..7de02ed 100644
> --- a/drivers/video/backlight/max8925_bl.c
> +++ b/drivers/video/backlight/max8925_bl.c
> @@ -101,6 +101,29 @@ static const struct backlight_ops max8925_backlight_ops = {
>   	.get_brightness	= max8925_backlight_get_brightness,
>   };
>   
> +#ifdef CONFIG_OF
> +static int max8925_backlight_dt_init(struct platform_device *pdev,
> +			      struct max8925_backlight_pdata *pdata)
> +{
> +	struct device_node *nproot = pdev->dev.parent->of_node, *np;
> +	int dual_string;
> +
> +	if (!nproot)
> +		return -ENODEV;
> +	np = of_find_node_by_name(nproot, "backlight");
> +	if (!np) {
> +		dev_err(&pdev->dev, "failed to find backlight node\n");
> +		return -ENODEV;
> +	}
> +
> +	of_property_read_u32(np, "dual-string", &dual_string);
> +	pdata->dual_string = dual_string;
> +	return 0;
> +}
> +#else
> +#define max8925_backlight_dt_init(x, y)	(-1)
> +#endif
> +
>   static int __devinit max8925_backlight_probe(struct platform_device *pdev)
>   {
>   	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
> @@ -150,6 +173,13 @@ static int __devinit max8925_backlight_probe(struct platform_device *pdev)
>   	platform_set_drvdata(pdev, bl);
>   
>   	value = 0;
> +	if (pdev->dev.parent->of_node && !pdata) {
> +		pdata = devm_kzalloc(&pdev->dev,
> +				     sizeof(struct max8925_backlight_pdata),
> +				     GFP_KERNEL);
> +		max8925_backlight_dt_init(pdev, pdata);
> +	}
> +
>   	if (pdata) {
>   		if (pdata->lxw_scl)
>   			value |= (1 << 7);
> @@ -161,7 +191,6 @@ static int __devinit max8925_backlight_probe(struct platform_device *pdev)
>   	ret = max8925_set_bits(chip->i2c, data->reg_mode_cntl, 0xfe, value);
>   	if (ret < 0)
>   		goto out_brt;
> -
>   	backlight_update_status(bl);
>   	return 0;
>   out_brt:
Hi Liam, Mark,

Could you help me review this patch, Thanks a lot!

-Qing
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