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