[PATCH] dmaengine:sirf:take clock and enable it while probing
Vinod Koul
vinod.koul at intel.com
Thu Mar 21 08:53:44 EDT 2013
On Mon, Mar 18, 2013 at 04:33:43PM +0800, Barry Song wrote:
> From: Barry Song <Baohua.Song at csr.com>
>
> 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 at csr.com>
Applied thanks
> ---
> drivers/dma/sirf-dma.c | 11 +++++++++++
> 1 files changed, 11 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/dma/sirf-dma.c b/drivers/dma/sirf-dma.c
> index 1d627e2..c439529 100644
> --- 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);
> --
> 1.7.5.4
>
>
>
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