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SubjectRe: [PATCH v1 05/17] drm/mediatek: hdmi: use a syscon/regmap instead of iomem
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Il 19/09/22 18:56, Guillaume Ranquet ha scritto:
> To prepare support for newer chips that need to share their address
> range with a dedicated ddc driver, move to a syscon.
>
> Signed-off-by: Guillaume Ranquet <granquet@baylibre.com>
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> index 3196189429bc..5cd05d4fe1a9 100644
> --- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c

..snip..

> @@ -1428,7 +1413,6 @@ static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi,
> struct device_node *cec_np, *remote, *i2c_np;
> struct platform_device *cec_pdev;
> struct regmap *regmap;
> - struct resource *mem;
> int ret;
>
> ret = mtk_hdmi_get_all_clk(hdmi, np);
> @@ -1474,8 +1458,7 @@ static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi,
> }
> hdmi->sys_regmap = regmap;
>
> - mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> - hdmi->regs = devm_ioremap_resource(dev, mem);
> + hdmi->regs = syscon_node_to_regmap(dev->of_node);

Nack. You're breaking ABI, this will force everyone to add syscon to devicetree,
hence this breaks retrocompatibility with old devicetrees.

Hint: not here, device_node_to_regmap()

Regards,
Angelo

> if (IS_ERR(hdmi->regs)) {
> ret = PTR_ERR(hdmi->regs);
> goto put_device;


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