[PATCH] i2c: designware: Add clk_{un}prepare() support

[Viresh Kumar]

clk_{un}prepare is mandatory for platforms using common clock framework. Since
this driver is used by SPEAr platform, which supports common clock framework,
add clk_{un}prepare() support for designware i2c.

Signed-off-by: Viresh Kumar <viresh.ku...@st.com>
---
 drivers/i2c/busses/i2c-designware-platdrv.c |   19 ++++++++++++++++---
 1 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c 
b/drivers/i2c/busses/i2c-designware-platdrv.c
index 76bf108..7b50eec 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -97,13 +97,20 @@ static int __devinit dw_i2c_probe(struct platform_device 
*pdev)
        platform_set_drvdata(pdev, dev);
 
        dev->clk = clk_get(&pdev->dev, NULL);
-       dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
-
        if (IS_ERR(dev->clk)) {
                r = -ENODEV;
                goto err_free_mem;
        }
-       clk_enable(dev->clk);
+
+       r = clk_prepare(dev->clk);
+       if (r)
+               goto err_put_clk;
+
+       r = clk_enable(dev->clk);
+       if (r)
+               goto err_unprepare_clk;
+
+       dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
 
        dev->functionality =
                I2C_FUNC_I2C |
@@ -181,6 +188,9 @@ err_iounmap:
        iounmap(dev->base);
 err_unuse_clocks:
        clk_disable(dev->clk);
+err_unprepare_clk:
+       clk_unprepare(dev->clk);
+err_put_clk:
        clk_put(dev->clk);
        dev->clk = NULL;
 err_free_mem:
@@ -203,6 +213,7 @@ static int __devexit dw_i2c_remove(struct platform_device 
*pdev)
        put_device(&pdev->dev);
 
        clk_disable(dev->clk);
+       clk_unprepare(dev->clk);
        clk_put(dev->clk);
        dev->clk = NULL;
 
@@ -230,6 +241,7 @@ static int dw_i2c_suspend(struct device *dev)
        struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
 
        clk_disable(i_dev->clk);
+       clk_unprepare(i_dev->clk);
 
        return 0;
 }
@@ -239,6 +251,7 @@ static int dw_i2c_resume(struct device *dev)
        struct platform_device *pdev = to_platform_device(dev);
        struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
 
+       clk_prepare(i_dev->clk);
        clk_enable(i_dev->clk);
        i2c_dw_init(i_dev);
 
-- 
1.7.9

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