dmaengine:sirf:take clock and enable it while probing

there is hardcode which enabled the clock of dmaengine before,
this patch takes the clock by standard clock API and enable it
in probe.

Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

diff --git a/drivers/dma/sirf-dma.c b/drivers/dma/sirf-dma.c
index 1d627e2..c439529 100644 (file)
--- a/drivers/dma/sirf-dma.c
+++ b/drivers/dma/sirf-dma.c
@@ -16,6 +16,7 @@
 #include <linux/of_address.h>
 #include <linux/of_device.h>
 #include <linux/of_platform.h>
+#include <linux/clk.h>
 #include <linux/sirfsoc_dma.h>
 
 #include "dmaengine.h"
@@ -78,6 +79,7 @@ struct sirfsoc_dma {
        struct sirfsoc_dma_chan         channels[SIRFSOC_DMA_CHANNELS];
        void __iomem                    *base;
        int                             irq;
+       struct clk                      *clk;
        bool                            is_marco;
 };
 
@@ -639,6 +641,12 @@ static int sirfsoc_dma_probe(struct platform_device *op)
                return -EINVAL;
        }
 
+       sdma->clk = devm_clk_get(dev, NULL);
+       if (IS_ERR(sdma->clk)) {
+               dev_err(dev, "failed to get a clock.\n");
+               return PTR_ERR(sdma->clk);
+       }
+
        ret = of_address_to_resource(dn, 0, &res);
        if (ret) {
                dev_err(dev, "Error parsing memory region!\n");
@@ -698,6 +706,8 @@ static int sirfsoc_dma_probe(struct platform_device *op)
 
        tasklet_init(&sdma->tasklet, sirfsoc_dma_tasklet, (unsigned long)sdma);
 
+       clk_prepare_enable(sdma->clk);
+
        /* Register DMA engine */
        dev_set_drvdata(dev, sdma);
        ret = dma_async_device_register(dma);
@@ -720,6 +730,7 @@ static int sirfsoc_dma_remove(struct platform_device *op)
        struct device *dev = &op->dev;
        struct sirfsoc_dma *sdma = dev_get_drvdata(dev);
 
+       clk_disable_unprepare(sdma->clk);
        dma_async_device_unregister(&sdma->dma);
        free_irq(sdma->irq, sdma);
        irq_dispose_mapping(sdma->irq);