[PATCH RFC/RFT 1/6] clk: core: add support for generic big endian accesses

[Jonas Gorski]

Add a generic flag to mark a clock as big endian register based, and add
accessors following these.

Signed-off-by: Jonas Gorski <jonas.gorski at gmail.com>
---
 drivers/clk/clk.c            |  1 +
 include/linux/clk-provider.h | 27 +++++++++++++++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 96053a96fe2f..b706022bb83d 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -2859,6 +2859,7 @@ static const struct {
 	ENTRY(CLK_IS_CRITICAL),
 	ENTRY(CLK_OPS_PARENT_ENABLE),
 	ENTRY(CLK_DUTY_CYCLE_PARENT),
+	ENTRY(CLK_IS_BIG_ENDIAN),
 #undef ENTRY
 };
 
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index b7cf80a71293..2c7c17652d75 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -35,6 +35,7 @@
 #define CLK_OPS_PARENT_ENABLE	BIT(12)
 /* duty cycle call may be forwarded to the parent clock */
 #define CLK_DUTY_CYCLE_PARENT	BIT(13)
+#define CLK_IS_BIG_ENDIAN	BIT(14) /* clk registers are big endian */
 
 struct clk;
 struct clk_hw;
@@ -1024,6 +1025,32 @@ static inline void clk_writel(u32 val, u32 __iomem *reg)
 
 #endif	/* platform dependent I/O accessors */
 
+static inline u32 clk_readl_be(u32 __iomem *reg)
+{
+	return ioread32be(reg);
+}
+
+static inline void clk_writel_be(u32 val, u32 __iomem *reg)
+{
+	iowrite32be(val, reg);
+}
+
+static inline u32 clk_hw_readl(struct clk_hw *clk, u32 __iomem *reg)
+{
+	if (clk_hw_get_flags(clk) & CLK_IS_BIG_ENDIAN)
+		return clk_readl_be(reg);
+	else
+		return clk_readl(reg);
+}
+
+static inline void clk_hw_writel(struct clk_hw *clk, u32 val, u32 __iomem *reg)
+{
+	if (clk_hw_get_flags(clk) & CLK_IS_BIG_ENDIAN)
+		clk_writel_be(val, reg);
+	else
+		clk_writel(val, reg);
+}
+
 void clk_gate_restore_context(struct clk_hw *hw);
 
 #endif /* CONFIG_COMMON_CLK */
-- 
2.13.2