[PATCH 07/11] clk: gate: add CLK_GATE_HIWORD_MASK flag

[Beniamino Galvani <b.galvani@gmail.com>]

Clock gates having the CLK_GATE_HIWORD_MASK flag set use the upper 16
bits of the register as a "write enable" mask for the value in the
lower 16 bits.

Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
---
 drivers/clk/clk-gate.c |   17 ++++++++++++-----
 include/linux/clk.h    |    1 +
 2 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/drivers/clk/clk-gate.c b/drivers/clk/clk-gate.c
index 54489c4..85eba3d 100644
--- a/drivers/clk/clk-gate.c
+++ b/drivers/clk/clk-gate.c
@@ -37,12 +37,19 @@ static void clk_gate_endisable(struct clk *clk, int enable)
 	u32 val;
 
 	set ^= enable;
-	val = readl(gate->reg);
 
-	if (set)
-		val |= BIT(gate->shift);
-	else
-		val &= ~BIT(gate->shift);
+	if (gate->flags & CLK_GATE_HIWORD_MASK) {
+		val = BIT(gate->shift + 16);
+		if (set)
+			val |= BIT(gate->shift);
+	} else {
+		val = readl(gate->reg);
+
+		if (set)
+			val |= BIT(gate->shift);
+		else
+			val &= ~BIT(gate->shift);
+	}
 
 	writel(val, gate->reg);
 }
diff --git a/include/linux/clk.h b/include/linux/clk.h
index fbfdd4f..49cb5a2 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -200,6 +200,7 @@ static inline int clk_set_rate(struct clk *clk, unsigned long rate)
 #define CLK_SET_RATE_PARENT     (1 << 0) /* propagate rate change up one level */
 
 #define CLK_GATE_INVERTED	(1 << 0)
+#define CLK_GATE_HIWORD_MASK	(1 << 1)
 
 struct clk_ops {
 	int		(*enable)(struct clk *clk);
-- 
1.7.10.4


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