linux-kernel - [PATCH] dmaengine: dw: support for clockless platforms

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Date:	Tue, 20 Jan 2015 14:57:57 +0200
From:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:	Viresh Kumar <viresh.linux@...il.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:	Vinod Koul <vinod.koul@...el.com>, linux-kernel@...r.kernel.org,
	dmaengine@...r.kernel.org
Subject: [PATCH] dmaengine: dw: support for clockless platforms

When requesting clock in the platform driver, leaving
chip->clk value as NULL if -ENOENT is returned, and
continue. With other errors returning failure. It makes the
driver usable on platforms that do not provide the clock.

Signed-off-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
---
 drivers/dma/dw/platform.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/dw/platform.c b/drivers/dma/dw/platform.c
index 32ea1ac..b183bc0 100644
--- a/drivers/dma/dw/platform.c
+++ b/drivers/dma/dw/platform.c
@@ -180,8 +180,12 @@ static int dw_probe(struct platform_device *pdev)
 	chip->dev = dev;
 
 	chip->clk = devm_clk_get(chip->dev, "hclk");
-	if (IS_ERR(chip->clk))
-		return PTR_ERR(chip->clk);
+	if (IS_ERR(chip->clk)) {
+		if (PTR_ERR(chip->clk) == -ENOENT)
+			chip->clk = NULL;
+		else
+			return PTR_ERR(chip->clk);
+	}
 	err = clk_prepare_enable(chip->clk);
 	if (err)
 		return err;
-- 
2.1.4

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