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

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Message-ID: <20250211113409.1517534-43-angelogioacchino.delregno@collabora.com>
Date: Tue, 11 Feb 2025 12:34:09 +0100
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: chunkuang.hu@...nel.org
Cc: p.zabel@...gutronix.de,
	airlied@...il.com,
	simona@...ll.ch,
	maarten.lankhorst@...ux.intel.com,
	mripard@...nel.org,
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	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	matthias.bgg@...il.com,
	angelogioacchino.delregno@...labora.com,
	ck.hu@...iatek.com,
	jitao.shi@...iatek.com,
	jie.qiu@...iatek.com,
	junzhi.zhao@...iatek.com,
	dri-devel@...ts.freedesktop.org,
	linux-mediatek@...ts.infradead.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
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	kernel@...labora.com,
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	tommyyl.chen@...iatek.com,
	jason-jh.lin@...iatek.com,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH v6 42/42] drm/mediatek/hdmi: Use syscon_regmap_lookup_by_phandle_args

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.

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