[PATCH 4/4] clk: Add simple gated clock

Signed-off-by: Jeremy Kerr<redacted>

---
  drivers/clk/Kconfig    |    4 ++++
  drivers/clk/Makefile   |    1 +
  drivers/clk/clk-gate.c |   41 +++++++++++++++++++++++++++++++++++++++++
  include/linux/clk.h    |   13 +++++++++++++
  4 files changed, 59 insertions(+)

diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index 0a27963..75d2902 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig

@@ -9,3 +9,7 @@ config GENERIC_CLK
  config GENERIC_CLK_FIXED
  	bool
  	depends on GENERIC_CLK
+
+config GENERIC_CLK_GATE
+	bool
+	depends on GENERIC_CLK

diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index 9a3325a..d186446 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile

@@ -2,3 +2,4 @@
  obj-$(CONFIG_CLKDEV_LOOKUP)	+= clkdev.o
  obj-$(CONFIG_GENERIC_CLK)	+= clk.o
  obj-$(CONFIG_GENERIC_CLK_FIXED)	+= clk-fixed.o
+obj-$(CONFIG_GENERIC_CLK_GATE)	+= clk-gate.o

diff --git a/drivers/clk/clk-gate.c b/drivers/clk/clk-gate.c
new file mode 100644
index 0000000..833e0da
--- /dev/null
+++ b/drivers/clk/clk-gate.c

@@ -0,0 +1,41 @@
+
+#include<linux/clk.h>
+#include<linux/module.h>
+#include<asm/io.h>
+
+#define to_clk_gate(clk) container_of(clk, struct clk_gate, hw)
+
+static unsigned long clk_gate_get_rate(struct clk_hw *clk)
+{
+	return clk_get_rate(clk_get_parent(clk->clk));
+}
+
+static int clk_gate_enable(struct clk_hw *clk)
+{
+	struct clk_gate *gate = to_clk_gate(clk);
+	u32 reg;
+
+	reg = __raw_readl(gate->reg);
+	reg |= 1<<  gate->bit_idx;
+	__raw_writel(reg, gate->reg);