linux-kernel - [PATCH 1/4] tty: serial: 8250_mtk: Use devm_clk

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Date:	Thu, 23 Apr 2015 10:51:03 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	linux-kernel@...r.kernel.org
Cc:	gregkh@...uxfoundation.org,
	Matthias Brugger <matthias.bgg@...il.com>,
	linux-mediatek@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org, linux-serial@...r.kernel.org,
	Alan Cox <alan@...ux.intel.com>,
	Sascha Hauer <s.hauer@...gutronix.de>
Subject: [PATCH 1/4] tty: serial: 8250_mtk: Use devm_clk_get

Just because of_clk_get() doesn't mean it should be used. Use devm_clk_get
which is the correct function when a struct device * is available. Also
since it's a devm function we can drop the calls to clk_put(). While at
it also fix a wrong debug message.

Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
---
 drivers/tty/serial/8250/8250_mtk.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c
index 7a11fac..c6901dc 100644
--- a/drivers/tty/serial/8250/8250_mtk.c
+++ b/drivers/tty/serial/8250/8250_mtk.c
@@ -131,18 +131,16 @@ static int mtk8250_probe_of(struct platform_device *pdev, struct uart_port *p,
 			   struct mtk8250_data *data)
 {
 	int err;
-	struct device_node *np = pdev->dev.of_node;
 
-	data->uart_clk = of_clk_get(np, 0);
+	data->uart_clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(data->uart_clk)) {
-		dev_warn(&pdev->dev, "Can't get timer clock\n");
+		dev_warn(&pdev->dev, "Can't get uart clock\n");
 		return PTR_ERR(data->uart_clk);
 	}
 
 	err = clk_prepare_enable(data->uart_clk);
 	if (err) {
 		dev_warn(&pdev->dev, "Can't prepare clock\n");
-		clk_put(data->uart_clk);
 		return err;
 	}
 	p->uartclk = clk_get_rate(data->uart_clk);
@@ -216,7 +214,6 @@ static int mtk8250_remove(struct platform_device *pdev)
 	serial8250_unregister_port(data->line);
 	if (!IS_ERR(data->uart_clk)) {
 		clk_disable_unprepare(data->uart_clk);
-		clk_put(data->uart_clk);
 	}
 
 	pm_runtime_disable(&pdev->dev);
-- 
2.1.4

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