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@xxxxxxxxxxx>
---
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
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