linux-kernel - Re: [PATCH] extcon: arizona: Get pdata from arizona structure not device

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Message-id: <5248B9BA.9020003@samsung.com>
Date:	Mon, 30 Sep 2013 08:37:30 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
Cc:	myungjoo.ham@...sung.com, broonie@...nel.org,
	patches@...nsource.wolfsonmicro.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] extcon: arizona: Get pdata from arizona structure not
 device

On 09/28/2013 11:34 PM, Charles Keepax wrote:
> In the case of a device tree system there will be no pdata attached to
> the device, causing us to deference a NULL pointer. Better to take the
> pdata from the Arizona structure as this will always exist and we know
> will have been populated since it is populated by the MFD device which
> binds in the extcon driver.
> 
> Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
> ---
>  drivers/extcon/extcon-arizona.c |    4 +---
>  1 files changed, 1 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/extcon/extcon-arizona.c b/drivers/extcon/extcon-arizona.c
> index ec9a14e..178454d 100644
> --- a/drivers/extcon/extcon-arizona.c
> +++ b/drivers/extcon/extcon-arizona.c
> @@ -1079,7 +1079,7 @@ static void arizona_micd_set_level(struct arizona *arizona, int index,
>  static int arizona_extcon_probe(struct platform_device *pdev)
>  {
>  	struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
> -	struct arizona_pdata *pdata;
> +	struct arizona_pdata *pdata = &arizona->pdata;
>  	struct arizona_extcon_info *info;
>  	unsigned int val;
>  	int jack_irq_fall, jack_irq_rise;
> @@ -1088,8 +1088,6 @@ static int arizona_extcon_probe(struct platform_device *pdev)
>  	if (!arizona->dapm || !arizona->dapm->card)
>  		return -EPROBE_DEFER;
>  
> -	pdata = dev_get_platdata(arizona->dev);
> -
>  	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
>  	if (!info) {
>  		dev_err(&pdev->dev, "Failed to allocate memory\n");
> 

No, extcon-arizona driver don't currently support DT to get platform data.
I cannot find some dt function to parse data from dts file.
You have to implement extcon-arizona driver by using DT binding style
to get platform data. I think this patch is not necessary.

Thanks
Chanwoo Choi





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