linux-kernel - Re: [PATCH 1/2] drm/mediatek/hdmi: Use syscon_regmap_lookup_by_phandle

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Message-ID: <516d16e3-6fc6-49ba-a0ce-f451b65a6c1a@collabora.com>
Date: Mon, 13 Jan 2025 13:41:46 +0100
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
 Chun-Kuang Hu <chunkuang.hu@...nel.org>,
 Philipp Zabel <p.zabel@...gutronix.de>, David Airlie <airlied@...il.com>,
 Simona Vetter <simona@...ll.ch>, Matthias Brugger <matthias.bgg@...il.com>,
 dri-devel@...ts.freedesktop.org, linux-mediatek@...ts.infradead.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/2] drm/mediatek/hdmi: Use
 syscon_regmap_lookup_by_phandle_args

Il 12/01/25 14:47, Krzysztof Kozlowski ha scritto:
> Use syscon_regmap_lookup_by_phandle_args() which is a wrapper over
> syscon_regmap_lookup_by_phandle() combined with getting the syscon
> argument.  Except simpler code this annotates within one line that given
> phandle has arguments, so grepping for code would be easier.
> 
> There is also no real benefit in printing errors on missing syscon
> argument, because this is done just too late: runtime check on
> static/build-time data.  Dtschema and Devicetree bindings offer the
> static/build-time check for this already.
> 

I agree with this change but can you please rebase it over [1]?

The same code got migrated to mtk_hdmi_common.c instead :-)

[1]: 
https://lore.kernel.org/r/20250108112744.64686-1-angelogioacchino.delregno@collabora.com

Thanks,
Angelo

> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> ---
>   drivers/gpu/drm/mediatek/mtk_hdmi.c | 14 +++++---------
>   1 file changed, 5 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> index ca82bc829cb9..4b0eb7dc25d8 100644
> --- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> @@ -1458,15 +1458,11 @@ static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi,
>   	 * MMSYS_CONFIG device and the register offset of the HDMI_SYS_CFG
>   	 * registers it contains.
>   	 */
> -	regmap = syscon_regmap_lookup_by_phandle(np, "mediatek,syscon-hdmi");
> -	ret = of_property_read_u32_index(np, "mediatek,syscon-hdmi", 1,
> -					 &hdmi->sys_offset);
> -	if (IS_ERR(regmap))
> -		ret = PTR_ERR(regmap);
> -	if (ret) {
> -		dev_err(dev,
> -			"Failed to get system configuration registers: %d\n",
> -			ret);
> +	regmap = syscon_regmap_lookup_by_phandle_args(np, "mediatek,syscon-hdmi",
> +						      1, &hdmi->sys_offset);
> +	if (IS_ERR(regmap)) {
> +		ret = dev_err_probe(dev, PTR_ERR(regmap),
> +				    "Failed to get system configuration registers\n");
>   		goto put_device;
>   	}
>   	hdmi->sys_regmap = regmap;


-- 
AngeloGioacchino Del Regno
Senior Software Engineer

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