[PATCH] spi/pl022: Enable clock in probe an use runtime_idle

[Ulf Hansson]

Since we are always runtime resumed when leaving probe
the clock must be enabled. To accomplish that we are able
to be runtime suspended after probe in the case when no
request is going to be recieved, a runtime_idle function
has been implemented.

Change-Id: I6cb86f2cad30ecaab16f512daf4674b039b18213
Signed-off-by: Ulf Hansson <ulf.hansson at stericsson.com>
Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/34447
---
 drivers/spi/spi-pl022.c |   18 +++++++++++++++++-
 1 files changed, 17 insertions(+), 1 deletions(-)

diff --git a/drivers/spi/spi-pl022.c b/drivers/spi/spi-pl022.c
index f103e47..ad48fba 100644
--- a/drivers/spi/spi-pl022.c
+++ b/drivers/spi/spi-pl022.c
@@ -2184,6 +2184,12 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id)
 		goto  err_clk_prep;
 	}
 
+	status = clk_enable(pl022->clk);
+	if (status) {
+		dev_err(&adev->dev, "could not enable SSP/SPI bus clock\n");
+		goto err_no_clk_en;
+	}
+
 	/* Disable SSP */
 	writew((readw(SSP_CR1(pl022->virtbase)) & (~SSP_CR1_MASK_SSE)),
 	       SSP_CR1(pl022->virtbase));
@@ -2237,6 +2243,8 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id)
 
 	free_irq(adev->irq[0], pl022);
  err_no_irq:
+	clk_disable(pl022->clk);
+ err_no_clk_en:
 	clk_unprepare(pl022->clk);
  err_clk_prep:
 	clk_put(pl022->clk);
@@ -2342,11 +2350,19 @@ static int pl022_runtime_resume(struct device *dev)
 
 	return 0;
 }
+
+static int pl022_runtime_idle(struct device *dev)
+{
+	pm_runtime_suspend(dev);
+	return 0;
+}
 #endif
 
 static const struct dev_pm_ops pl022_dev_pm_ops = {
 	SET_SYSTEM_SLEEP_PM_OPS(pl022_suspend, pl022_resume)
-	SET_RUNTIME_PM_OPS(pl022_runtime_suspend, pl022_runtime_resume, NULL)
+	SET_RUNTIME_PM_OPS(pl022_runtime_suspend,
+			   pl022_runtime_resume,
+			   pl022_runtime_idle)
 };
 
 static struct vendor_data vendor_arm = {
-- 
1.7.5.4