linux-kernel - [PATCH v4, 25/33] drm/mediatek: add clock property check before get it

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Date:   Tue, 9 Jul 2019 06:34:05 +0800
From:   <yongqiang.niu@...iatek.com>
To:     CK Hu <ck.hu@...iatek.com>, Philipp Zabel <p.zabel@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>
CC:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Mark Rutland <mark.rutland@....com>,
        <dri-devel@...ts.freedesktop.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        Yongqiang Niu <yongqiang.niu@...iatek.com>
Subject: [PATCH v4, 25/33] drm/mediatek: add clock property check before get it

From: Yongqiang Niu <yongqiang.niu@...iatek.com>

This patch add clock property check before get it

Signed-off-by: Yongqiang Niu <yongqiang.niu@...iatek.com>
---
 drivers/gpu/drm/mediatek/mtk_drm_ddp.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
index c57e7ab..a9d3e27 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
@@ -668,10 +668,12 @@ static int mtk_ddp_probe(struct platform_device *pdev)
 	for (i = 0; i < 10; i++)
 		ddp->mutex[i].id = i;
 
-	ddp->clk = devm_clk_get(dev, NULL);
-	if (IS_ERR(ddp->clk)) {
-		dev_err(dev, "Failed to get clock\n");
-		return PTR_ERR(ddp->clk);
+	if (of_find_property(dev->of_node, "clocks", &i)) {
+		ddp->clk = devm_clk_get(dev, NULL);
+		if (IS_ERR(ddp->clk)) {
+			dev_err(dev, "Failed to get clock\n");
+			return PTR_ERR(ddp->clk);
+		}
 	}
 
 	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-- 
1.8.1.1.dirty