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

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Message-ID: <20250112134708.46100-1-krzysztof.kozlowski@linaro.org>
Date: Sun, 12 Jan 2025 14:47:07 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: 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>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	dri-devel@...ts.freedesktop.org,
	linux-mediatek@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH 1/2] 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@...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;
-- 
2.43.0