[PATCH v5 2/4] amba: Add helper macros for (un)preparing AMBA clock

[Krzysztof Kozlowski <k.kozlowski@samsung.com>]

Add amba_pclk_prepare() and amba_pclk_unprepare() macros for handling
the AMBA bus clock by device drivers.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
---
 include/linux/amba/bus.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/amba/bus.h b/include/linux/amba/bus.h
index fdd7e1b61f60..ad52027a9cbf 100644
--- a/include/linux/amba/bus.h
+++ b/include/linux/amba/bus.h
@@ -92,6 +92,12 @@ void amba_release_regions(struct amba_device *);
 #define amba_pclk_disable(d)	\
 	do { if (!IS_ERR((d)->pclk)) clk_disable((d)->pclk); } while (0)
 
+#define amba_pclk_prepare(d)	\
+	(IS_ERR((d)->pclk) ? 0 : clk_prepare((d)->pclk))
+
+#define amba_pclk_unprepare(d)	\
+	do { if (!IS_ERR((d)->pclk)) clk_unprepare((d)->pclk); } while (0)
+
 /* Some drivers don't use the struct amba_device */
 #define AMBA_CONFIG_BITS(a) (((a) >> 24) & 0xff)
 #define AMBA_REV_BITS(a) (((a) >> 20) & 0x0f)
-- 
1.9.1