Re: [PATCH 1/2] drm/mediatek/hdmi: Use syscon_regmap_lookup_by_phandle_args

[AngeloGioacchino Del Regno]

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@xxxxxxxxxxxxx

Thanks,
Angelo

> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
> ---
>   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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