Add device tree binding for the BCM63xx's gated clocks.

The BCM63xx contains clocks gated with a register. Clocks are indexed
by bits in the register and are active high. Clock gate bits are
interleaved with other status bits and configurable clocks in the same
register.

Signed-off-by: Simon Arlott <redacted>
---
 .../bindings/clock/brcm,bcm63xx-gate-clk.txt       | 58 ++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/brcm,bcm63xx-gate-clk.txt

diff --git a/Documentation/devicetree/bindings/clock/brcm,bcm63xx-gate-clk.txt b/Documentation/devicetree/bindings/clock/brcm,bcm63xx-gate-clk.txt
new file mode 100644
index 0000000..3f4ead1
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/brcm,bcm63xx-gate-clk.txt

@@ -0,0 +1,58 @@
+Broadcom BCM63xx clocks
+
+This binding uses the common clock binding:
+	Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+The BCM63xx contains clocks gated with a register. Clocks are indexed
+by bits in the register and are active high. Clock gate bits are
+interleaved with other status bits and configurable clocks in the same
+register.
+
+Required properties:
+- compatible:	Should be "brcm,bcm<soc>-gate-clk", "brcm,bcm63xx-gate-clk"
+- #clock-cells:	Should be <1>.
+- regmap:	The register map phandle
+- offset:	Offset in the register map for the reboot register (in bytes)
+- clocks:	The external oscillator clock phandle
+
+Example:
+
+periph_clk: periph_clk {
+	compatible = "brcm,bcm63168-gate-clk", "brcm,bcm63xx-gate-clk";
+	regmap = <&periph_cntl>;