mvebu: gpio based pwm support

Signed-off-by: Imre Kaloz <kaloz@openwrt.org>



git-svn-id: svn://svn.openwrt.org/openwrt/trunk@44129 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 52 insertions, 0 deletions

diff --git a/target/linux/mvebu/patches-3.18/203-dt_bindings_extend_mvebu_gpio_documentation_with_pwm.patch b/target/linux/mvebu/patches-3.18/203-dt_bindings_extend_mvebu_gpio_documentation_with_pwm.patch
new file mode 100644
index 0000000000..48f93944bf
--- /dev/null
+++ b/target/linux/mvebu/patches-3.18/203-dt_bindings_extend_mvebu_gpio_documentation_with_pwm.patch
@@ -0,0 +1,52 @@
+Document the optional parameters needed for PWM operation of gpio
+lines.
+
+Signed-off-by: Andrew Lunn <andrew@lunn.ch>
+---
+ .../devicetree/bindings/gpio/gpio-mvebu.txt        | 31 ++++++++++++++++++++++
+ 1 file changed, 31 insertions(+)
+
+--- a/Documentation/devicetree/bindings/gpio/gpio-mvebu.txt
++++ b/Documentation/devicetree/bindings/gpio/gpio-mvebu.txt
+@@ -38,6 +38,23 @@ Required properties:
+ - #gpio-cells: Should be two. The first cell is the pin number. The
+   second cell is reserved for flags, unused at the moment.
+ 
++Optional properties:
++
++In order to use the gpio lines in PWM mode, some additional optional
++properties are required. Only Armada 370 and XP supports these
++properties.
++
++- reg: an additional register set is needed, for the GPIO Blink
++  Counter on/off registers.
++
++- reg-names: Must contain an entry "pwm" corresponding to the
++  additional register range needed for pwm operation.
++
++- #pwm-cells: Should be two. The first cell is the pin number. The
++  second cell is reserved for flags, unused at the moment.
++
++- clocks: Must be a phandle to the clock for the gpio controller.
++
+ Example:
+ 
+ 		gpio0: gpio@d0018100 {
+@@ -51,3 +68,17 @@ Example:
+ 			#interrupt-cells = <2>;
+ 			interrupts = <16>, <17>, <18>, <19>;
+ 		};
++
++		gpio1: gpio@18140 {
++			compatible = "marvell,orion-gpio";
++			reg = <0x18140 0x40>, <0x181c8 0x08>;
++			reg-names = "gpio", "pwm";
++			ngpios = <17>;
++			gpio-controller;
++			#gpio-cells = <2>;
++			#pwm-cells = <2>;
++			interrupt-controller;
++			#interrupt-cells = <2>;
++			interrupts = <87>, <88>, <89>;
++			clocks = <&coreclk 0>;
++		};