linux-kernel - Re: [PATCH] media: rcar_drif: Make use of the helper function devm_platform_ioremap

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Date:   Wed, 1 Sep 2021 12:03:27 +0100
From:   Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
To:     Hans Verkuil <hverkuil@...all.nl>,
        Cai Huoqing <caihuoqing@...du.com>
Cc:     Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: rcar_drif: Make use of the helper function
 devm_platform_ioremap_resource()

On 01/09/2021 09:19, Hans Verkuil wrote:
> On 01/09/2021 07:55, Cai Huoqing wrote:
>> Use the devm_platform_ioremap_resource() helper instead of
>> calling platform_get_resource() and devm_ioremap_resource()
>> separately
>>
>> Signed-off-by: Cai Huoqing <caihuoqing@...du.com>
>> ---
>>  drivers/media/platform/rcar_drif.c | 4 +---
>>  1 file changed, 1 insertion(+), 3 deletions(-)
>>
>> diff --git a/drivers/media/platform/rcar_drif.c b/drivers/media/platform/rcar_drif.c
>> index a505d991548b..f0a1edb57841 100644
>> --- a/drivers/media/platform/rcar_drif.c
>> +++ b/drivers/media/platform/rcar_drif.c
>> @@ -1376,7 +1376,6 @@ static int rcar_drif_probe(struct platform_device *pdev)
>>  	struct rcar_drif_sdr *sdr;
>>  	struct device_node *np;
>>  	struct rcar_drif *ch;
>> -	struct resource	*res;
>>  	int ret;
>>  
>>  	/* Reserve memory for enabled channel */
>> @@ -1395,8 +1394,7 @@ static int rcar_drif_probe(struct platform_device *pdev)
>>  	}
>>  
>>  	/* Register map */
>> -	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> -	ch->base = devm_ioremap_resource(&pdev->dev, res);
>> +	ch->base = devm_platform_ioremap_resource(pdev, 0);

This could keep struct resource *res above and use:

	ch->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res)

With that, (and the commit message / subject updated accordingly):

Reviewed-by: Kieran Bingham <kieran.bingham@...asonboard.com>



>>  	if (IS_ERR(ch->base))
>>  		return PTR_ERR(ch->base);
>>  
>>
> 
> Compile error:
> 
> drivers/media/platform/rcar_drif.c: In function ‘rcar_drif_probe’:
> drivers/media/platform/rcar_drif.c:1401:14: error: ‘res’ undeclared (first use in this function); did you mean ‘ret’?
>  1401 |  ch->start = res->start;
>       |              ^~~
>       |              ret
> drivers/media/platform/rcar_drif.c:1401:14: note: each undeclared identifier is reported only once for each function it appears in
> 
> Regards,
> 
> 	Hans
>