Add a devicetree binding documentation for the mt7621 driver.
Signed-off-by: Sergio Paracuellos <sergio.paracuel...@gmail.com>
Reviewed-by: NeilBrown <n...@brown.name>
---
.../bindings/gpio/mediatek,mt7621-gpio.txt | 68 ++++++++++++++++++++++
1 file changed, 68 insertions(+)
create mode 100644
Documentation/devicetree/bindings/gpio/mediatek,mt7621-gpio.txt
diff --git a/Documentation/devicetree/bindings/gpio/mediatek,mt7621-gpio.txt
b/Documentation/devicetree/bindings/gpio/mediatek,mt7621-gpio.txt
new file mode 100644
index 0000000..30d8a02
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/mediatek,mt7621-gpio.txt
@@ -0,0 +1,68 @@
+Mediatek SoC GPIO controller bindings
+
+The IP core used inside these SoCs has 3 banks of 32 GPIOs each.
+The registers of all the banks are interwoven inside one single IO range.
+We load one GPIO controller instance per bank. To make this possible
+we support 2 types of nodes. The parent node defines the memory I/O range and
+has 3 children each describing a single bank. Also the GPIO controller can
receive
+interrupts on any of the GPIOs, either edge or level. It then interrupts the
CPU
+using GIC INT12.
+
+Required properties for the top level node:
+- compatible:
+ - "mediatek,mt7621-gpio" for Mediatek controllers
+- reg : Physical base address and length of the controller's registers
+- interrupt-parent : phandle of the parent interrupt controller.
+- interrupts : Interrupt specifier for the controllers interrupt.
+- interrupt-controller : Mark the device node as an interrupt controller.
+- #interrupt-cells : Should be 2. The first cell defines the interrupt number.
+ The second cell bits[3:0] is used to specify trigger type as follows:
+ - 1 = low-to-high edge triggered.
+ - 2 = high-to-low edge triggered.
+ - 4 = active high level-sensitive.
+ - 8 = active low level-sensitive.
+
+
+Required properties for the GPIO bank node:
+- compatible:
+ - "mediatek,mt7621-gpio-bank" for Mediatek banks
+- #gpio-cells : Should be two. The first cell is the GPIO pin number and the
+ second cell specifies GPIO flags, as defined in <dt-bindings/gpio/gpio.h>.
+ Only the GPIO_ACTIVE_HIGH and GPIO_ACTIVE_LOW flags are supported.
+- gpio-controller : Marks the device node as a GPIO controller.
+- reg : The id of the bank that the node describes.
+
+Example:
+ gpio@600 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ compatible = "mediatek,mt7621-gpio";
+ reg = <0x600 0x100>;
+
+ interrupt-parent = <&gic>;
+ interrupts = <GIC_SHARED 12 IRQ_TYPE_LEVEL_HIGH>;
+ interrupt-controller;
+ #interrupt-cells = <2>;
+
+ gpio0: bank@0 {
+ reg = <0>;
+ compatible = "mediatek,mt7621-gpio-bank";
+ gpio-controller;
+ #gpio-cells = <2>;
+ };
+
+ gpio1: bank@1 {
+ reg = <1>;
+ compatible = "mediatek,mt7621-gpio-bank";
+ gpio-controller;
+ #gpio-cells = <2>;
+ };
+
+ gpio2: bank@2 {
+ reg = <2>;
+ compatible = "mediatek,mt7621-gpio-bank";
+ gpio-controller;
+ #gpio-cells = <2>;
+ };
+ };
--
2.7.4
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