From: Jingchang Lu <b35083@freescale.com>
Date: Wed, 7 Aug 2013 09:05:37 +0000 (+0800)
Subject: i2c: imx: enable clk before write to registers
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=46f2832b9f66b008fb813fe153f27794412fbc4f;p=deliverable%2Flinux.git

i2c: imx: enable clk before write to registers

The module clk should be enabled before write to
its register in probe(), and the clk can be disabled
after.

Signed-off-by: Jingchang Lu <b35083@freescale.com>
Reviewed-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
---

diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
index 9167d4332d77..7adb35115d95 100644
--- a/drivers/i2c/busses/i2c-imx.c
+++ b/drivers/i2c/busses/i2c-imx.c
@@ -543,6 +543,11 @@ static int __init i2c_imx_probe(struct platform_device *pdev)
 		return PTR_ERR(i2c_imx->clk);
 	}
 
+	ret = clk_prepare_enable(i2c_imx->clk);
+	if (ret) {
+		dev_err(&pdev->dev, "can't enable I2C clock\n");
+		return ret;
+	}
 	/* Request IRQ */
 	ret = devm_request_irq(&pdev->dev, irq, i2c_imx_isr, 0,
 				pdev->name, i2c_imx);
@@ -580,6 +585,7 @@ static int __init i2c_imx_probe(struct platform_device *pdev)
 
 	/* Set up platform driver data */
 	platform_set_drvdata(pdev, i2c_imx);
+	clk_disable_unprepare(i2c_imx->clk);
 
 	dev_dbg(&i2c_imx->adapter.dev, "claimed irq %d\n", irq);
 	dev_dbg(&i2c_imx->adapter.dev, "device resources from 0x%x to 0x%x\n",