dmaengine: dw: platform: Mark 'hclk' clock optional

On some platforms the clock can be fixed rate, always running one and
there is no need to do anything with it.

In order to support those platforms, switch to use optional clock.

Fixes: f8d9ddbc2851 ("dmaengine: dw: platform: Enable iDMA 32-bit on Intel Elkhart Lake")
Depends-on: 60b8f0ddf1a9 ("clk: Add (devm_)clk_get_optional() functions")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Link: https://lore.kernel.org/r/20190924085116.83683-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/drivers/dma/dw/platform.c b/drivers/dma/dw/platform.c
index c90c798e5ec347f8b2ddf4dbb4a6bd650834d46b..0585d749d935c5377fde18fef387ff6838efca81 100644 (file)
--- a/drivers/dma/dw/platform.c
+++ b/drivers/dma/dw/platform.c
@@ -66,7 +66,7 @@ static int dw_probe(struct platform_device *pdev)
 
        data->chip = chip;
 
-       chip->clk = devm_clk_get(chip->dev, "hclk");
+       chip->clk = devm_clk_get_optional(chip->dev, "hclk");
        if (IS_ERR(chip->clk))
                return PTR_ERR(chip->clk);
        err = clk_prepare_enable(chip->clk);