linux-kernel - Re: [PATCH 1/2] ASoC: tegra30: ahub: Use of_device_get_match

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Date:   Mon, 16 Aug 2021 13:02:12 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Aakash Hemadri <aakashhemadri123@...il.com>
Cc:     Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Takashi Iwai <tiwai@...e.com>,
        Jawoslav Kysela <perex@...ex.cz>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        alsa-devel@...a-project.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Shuah Khan <skhan@...uxfoundation.org>,
        Bjorn Helgaas <bjorn@...gaas.com>
Subject: Re: [PATCH 1/2] ASoC: tegra30: ahub: Use of_device_get_match_data

On Sun, Aug 15, 2021 at 01:42:18AM +0530, Aakash Hemadri wrote:
> Prefer `of_device_get_match_data` over `of_match_device`
> 
> Retrieve OF match data using `of_device_get_match_data`, this is cleaner
> and better expresses intent.
> 
> Signed-off-by: Aakash Hemadri <aakashhemadri123@...il.com>
> ---
>  sound/soc/tegra/tegra30_ahub.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/sound/soc/tegra/tegra30_ahub.c b/sound/soc/tegra/tegra30_ahub.c
> index b3e1df693381..0ac109b32329 100644
> --- a/sound/soc/tegra/tegra30_ahub.c
> +++ b/sound/soc/tegra/tegra30_ahub.c
> @@ -518,7 +518,7 @@ static int tegra30_ahub_probe(struct platform_device *pdev)
>  	void __iomem *regs_apbif, *regs_ahub;
>  	int ret = 0;
>  
> -	match = of_match_device(tegra30_ahub_of_match, &pdev->dev);
> +	match = of_device_get_match_data(&pdev->dev);

I think this is incorrect.

  const struct of_device_id *of_match_device(...)
  const void *of_device_get_match_data(...)

of_match_device() returns "struct of_device_id *", i.e., "match".

of_device_get_match_data() calls of_match_device() internally, then
returns "match->data".

>  	if (!match)
>  		return -EINVAL;
>  	soc_data = match->data;
> -- 
> 2.32.0
>