drm/mediatek/hdmi: Use syscon_regmap_lookup_by_phandle_args

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.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://patchwork.kernel.org/project/dri-devel/patch/20250415104321.51149-4-angelogioacchino.delregno@collabora.com/
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>

diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
index 06e4fac152b773252b7db52069fdadb3655298fb..1358a5095fde46e7292d1352b837a397e102d3f1 100644 (file)
--- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
@@ -1447,15 +1447,11 @@ 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;