linux-kernel - [PATCH 3/5] usb: chipidea: usb2: make clock optional

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Date:   Sat, 04 Apr 2020 02:00:05 +0200
From:   Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Peter Chen <Peter.Chen@....com>
Cc:     linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: [PATCH 3/5] usb: chipidea: usb2: make clock optional

Allow clock to be missing from DT (assume it's enabled then).

Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
---
 drivers/usb/chipidea/ci_hdrc_usb2.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/usb/chipidea/ci_hdrc_usb2.c b/drivers/usb/chipidea/ci_hdrc_usb2.c
index bf300a234e64..9086514840ed 100644
--- a/drivers/usb/chipidea/ci_hdrc_usb2.c
+++ b/drivers/usb/chipidea/ci_hdrc_usb2.c
@@ -64,13 +64,14 @@ static int ci_hdrc_usb2_probe(struct platform_device *pdev)
 	if (!priv)
 		return -ENOMEM;
 
-	priv->clk = devm_clk_get(dev, NULL);
-	if (!IS_ERR(priv->clk)) {
-		ret = clk_prepare_enable(priv->clk);
-		if (ret) {
-			dev_err(dev, "failed to enable the clock: %d\n", ret);
-			return ret;
-		}
+	priv->clk = devm_clk_get_optional(dev, NULL);
+	if (IS_ERR(priv->clk))
+		return PTR_ERR(priv->clk);;
+
+	ret = clk_prepare_enable(priv->clk);
+	if (ret) {
+		dev_err(dev, "failed to enable the clock: %d\n", ret);
+		return ret;
 	}
 
 	ci_pdata->name = dev_name(dev);
@@ -94,8 +95,7 @@ static int ci_hdrc_usb2_probe(struct platform_device *pdev)
 	return 0;
 
 clk_err:
-	if (!IS_ERR(priv->clk))
-		clk_disable_unprepare(priv->clk);
+	clk_disable_unprepare(priv->clk);
 	return ret;
 }
 
-- 
2.20.1