clk: add MOXA ART SoCs clock driver

MOXA ART SoCs allow to determine PLL output and APB frequencies
by reading registers holding multiplier and divisor information.

Add a clock driver for this SoC.

Signed-off-by: Jonas Jensen <jonas.jensen@gmail.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

1 files changed, 48 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/clock/moxa,moxart-clock.txt b/Documentation/devicetree/bindings/clock/moxa,moxart-clock.txt
new file mode 100644
index 000000000000..fedea84314a1
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/moxa,moxart-clock.txt
@@ -0,0 +1,48 @@
+Device Tree Clock bindings for arch-moxart
+
+This binding uses the common clock binding[1].
+
+[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+MOXA ART SoCs allow to determine PLL output and APB frequencies
+by reading registers holding multiplier and divisor information.
+
+
+PLL:
+
+Required properties:
+- compatible : Must be "moxa,moxart-pll-clock"
+- #clock-cells : Should be 0
+- reg : Should contain registers location and length
+- clocks : Should contain phandle + clock-specifier for the parent clock
+
+Optional properties:
+- clock-output-names : Should contain clock name
+
+
+APB:
+
+Required properties:
+- compatible : Must be "moxa,moxart-apb-clock"
+- #clock-cells : Should be 0
+- reg : Should contain registers location and length
+- clocks : Should contain phandle + clock-specifier for the parent clock
+
+Optional properties:
+- clock-output-names : Should contain clock name
+
+
+For example:
+
+	clk_pll: clk_pll@98100000 {
+		compatible = "moxa,moxart-pll-clock";
+		#clock-cells = <0>;
+		reg = <0x98100000 0x34>;
+	};
+
+	clk_apb: clk_apb@98100000 {
+		compatible = "moxa,moxart-apb-clock";
+		#clock-cells = <0>;
+		reg = <0x98100000 0x34>;
+		clocks = <&clk_pll>;
+	};