[PATCH AUTOSEL 5.4 039/205] dmaengine: dw: platform: Mark 'hclk' clock optional

[Sasha Levin]

From: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>

[ Upstream commit f27c22736d133baff0ab3fdc7b015d998267d817 ]

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@xxxxxxxxxxxxxxx>
Acked-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20190924085116.83683-1-andriy.shevchenko@xxxxxxxxxxxxxxx
Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/dma/dw/platform.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/dw/platform.c b/drivers/dma/dw/platform.c
index c90c798e5ec3..0585d749d935 100644
--- 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);
-- 
2.20.1