linux-kernel - Re: [PATCH] media: aspeed: Use of_device_get_match

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Message-ID: <f57759d5-9c2d-5113-3286-4fa03a2c11b2@aspeedtech.com>
Date:   Mon, 14 Feb 2022 16:05:44 +0800
From:   Jammy Huang <jammy_huang@...eedtech.com>
To:     Joel Stanley <joel@....id.au>
CC:     Eddie James <eajames@...ux.ibm.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Andrew Jeffery <andrew@...id.au>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-aspeed <linux-aspeed@...ts.ozlabs.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] media: aspeed: Use of_device_get_match_data() helper

Hi Joel,

On 2022/2/14 下午 02:34, Joel Stanley wrote:
> On Mon, 14 Feb 2022 at 03:27, Jammy Huang <jammy_huang@...eedtech.com> wrote:
>> Use of_device_get_match_data() to simplify the code.
>>
>> Signed-off-by: Jammy Huang <jammy_huang@...eedtech.com>
>> ---
>>   drivers/media/platform/aspeed-video.c | 8 ++------
>>   1 file changed, 2 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c
>> index 3904ded2052a..d4acf84cda9b 100644
>> --- a/drivers/media/platform/aspeed-video.c
>> +++ b/drivers/media/platform/aspeed-video.c
>> @@ -13,6 +13,7 @@
>>   #include <linux/module.h>
>>   #include <linux/mutex.h>
>>   #include <linux/of.h>
>> +#include <linux/of_device.h>
>>   #include <linux/of_irq.h>
>>   #include <linux/of_reserved_mem.h>
>>   #include <linux/platform_device.h>
>> @@ -2451,7 +2452,6 @@ MODULE_DEVICE_TABLE(of, aspeed_video_of_match);
>>   static int aspeed_video_probe(struct platform_device *pdev)
>>   {
>>          const struct aspeed_video_config *config;
>> -       const struct of_device_id *match;
>>          struct aspeed_video *video;
>>          int rc;
>>
>> @@ -2463,11 +2463,7 @@ static int aspeed_video_probe(struct platform_device *pdev)
>>          if (IS_ERR(video->base))
>>                  return PTR_ERR(video->base);
>>
>> -       match = of_match_node(aspeed_video_of_match, pdev->dev.of_node);
>> -       if (!match)
>> -               return -EINVAL;
>> -
>> -       config = match->data;
>> +       config = of_device_get_match_data(&pdev->dev);
> While normally this driver won't have probed without matching on some
> data, it would be sensible to add a check for a null pointer here.

OK, I will have a updated patch for this later.

Thanks for the help.

>>          video->version = config->version;
>>          video->jpeg_mode = config->jpeg_mode;
>>          video->comp_size_read = config->comp_size_read;
>> --
>> 2.25.1
>>
-- 
Best Regards
Jammy