linux-kernel - Re: [PATCH v6 42/42] drm/mediatek/hdmi: Use syscon_regmap_lookup_by_phandle

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Message-ID: <2443b8a50c1d1134b045d8724f204cb81acf2978.camel@mediatek.com>
Date: Thu, 13 Feb 2025 09:25:16 +0000
From: CK Hu (胡俊光) <ck.hu@...iatek.com>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
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Subject: Re: [PATCH v6 42/42] drm/mediatek/hdmi: Use
 syscon_regmap_lookup_by_phandle_args

On Tue, 2025-02-11 at 12:34 +0100, AngeloGioacchino Del Regno wrote:
> External email : Please do not click links or open attachments until you have verified the sender or the content.
> 
> 
> From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> 
> 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.

Reviewed-by: CK Hu <ck.hu@...iatek.com>

Maybe I should apply this version to prevent fixing conflict.

Regards,
CK

> 
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> [Angelo: Rebased over HDMIv2/DDCv2 series cleanups]
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_hdmi_common.c | 7 ++-----
>  1 file changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi_common.c b/drivers/gpu/drm/mediatek/mtk_hdmi_common.c
> index 750bcb45c33d..c9bf7085328c 100644
> --- a/drivers/gpu/drm/mediatek/mtk_hdmi_common.c
> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi_common.c
> @@ -269,12 +269,9 @@ static int mtk_hdmi_get_cec_dev(struct mtk_hdmi *hdmi, struct device *dev, struc
>          * MMSYS_CONFIG device and the register offset of the HDMI_SYS_CFG
>          * registers it contains.
>          */
> -       hdmi->sys_regmap = syscon_regmap_lookup_by_phandle(np, "mediatek,syscon-hdmi");
> +       hdmi->sys_regmap = syscon_regmap_lookup_by_phandle_args(np, "mediatek,syscon-hdmi",
> +                                                               1, &hdmi->sys_offset);
>         if (IS_ERR(hdmi->sys_regmap))
> -               return PTR_ERR(hdmi->sys_regmap);
> -
> -       ret = of_property_read_u32_index(np, "mediatek,syscon-hdmi", 1, &hdmi->sys_offset);
> -       if (ret)
>                 return dev_err_probe(dev, ret,
>                                      "Failed to get system configuration registers\n");
> 
> --
> 2.48.1
>