Document the devicetree bindings for PINCTRL and GPIO found on Microchip
PIC32 class devices.
Signed-off-by: Joshua Henderson <joshua.henderson@xxxxxxxxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
---
.../bindings/gpio/microchip,pic32-gpio.txt | 49 ++++++++++++++++
.../bindings/pinctrl/microchip,pic32-pinctrl.txt | 60 ++++++++++++++++++++
2 files changed, 109 insertions(+)
create mode 100644 Documentation/devicetree/bindings/gpio/microchip,pic32-gpio.txt
create mode 100644 Documentation/devicetree/bindings/pinctrl/microchip,pic32-pinctrl.txt
diff --git a/Documentation/devicetree/bindings/gpio/microchip,pic32-gpio.txt b/Documentation/devicetree/bindings/gpio/microchip,pic32-gpio.txt
new file mode 100644
index 0000000..ef37528
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/microchip,pic32-gpio.txt
@@ -0,0 +1,49 @@
+* Microchip PIC32 GPIO devices (PIO).
+
+Required properties:
+ - compatible: "microchip,pic32mzda-gpio"
+ - reg: Base address and length for the device.
+ - interrupts: The port interrupt shared by all pins.
+ - gpio-controller: Marks the port as GPIO controller.
+ - #gpio-cells: Two. The first cell is the pin number and
+ the second cell is used to specify the gpio polarity as defined in
+ defined in <dt-bindings/gpio/gpio.h>:
+ 0 = GPIO_ACTIVE_HIGH
+ 1 = GPIO_ACTIVE_LOW
+ 2 = GPIO_OPEN_DRAIN
+ - interrupt-controller: Marks the device node as an interrupt controller.
+ - #interrupt-cells: Two. The first cell is the GPIO number and second cell
+ is used to specify the trigger type as defined in
+ <dt-bindings/interrupt-controller/irq.h>:
+ IRQ_TYPE_EDGE_RISING
+ IRQ_TYPE_EDGE_FALLING
+ IRQ_TYPE_EDGE_BOTH
+ - clocks: Clock specifier (see clock bindings for details).
+ - microchip,gpio-bank: Specifies which bank a controller owns.
+ - gpio-ranges: Interaction with the PINCTRL subsystem.
+
+Example:
+
+/* PORTA */
+gpio0: gpio0@1f860000 {
+ compatible = "microchip,pic32mzda-gpio";
+ reg = <0x1f860000 0x100>;
+ interrupts = <118 IRQ_TYPE_LEVEL_HIGH>;
+ #gpio-cells = <2>;
+ gpio-controller;
+ interrupt-controller;
+ #interrupt-cells = <2>;
+ clocks = <&PBCLK4>;
+ microchip,gpio-bank = <0>;
+ gpio-ranges = <&pic32_pinctrl 0 0 16>;
+};
+
+keys {
+ ...
+
+ button@sw1 {
+ label = "ESC";
+ linux,code = <1>;
+ gpios = <&gpio0 12 0>;
+ };
+};
diff --git a/Documentation/devicetree/bindings/pinctrl/microchip,pic32-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/microchip,pic32-pinctrl.txt
new file mode 100644
index 0000000..4b5efa5
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/microchip,pic32-pinctrl.txt
@@ -0,0 +1,60 @@
+* Microchip PIC32 Pin Controller
+
+Please refer to pinctrl-bindings.txt, ../gpio/gpio.txt, and
+../interrupt-controller/interrupts.txt for generic information regarding
+pin controller, GPIO, and interrupt bindings.
+
+PIC32 'pin configuration node' is a node of a group of pins which can be
+used for a specific device or function. This node represents configuraions of
+pins, optional function, and optional mux related configuration.
+
+Required properties for pin controller node:
+ - compatible: "microchip,pic32mada-pinctrl"
+ - reg: Address range of the pinctrl registers.
+ - clocks: Clock specifier (see clock bindings for details)
+
+Required properties for pin configuration sub-nodes:
+ - pins: List of pins to which the configuration applies.
+
+Optional properties for pin configuration sub-nodes:
+----------------------------------------------------
+ - function: Mux function for the specified pins.
+ - bias-pull-up: Enable weak pull-up.
+ - bias-pull-down: Enable weak pull-down.
+ - input-enable: Set the pin as an input.
+ - output-low: Set the pin as an output level low.
+ - output-high: Set the pin as an output level high.
+ - microchip,digital: Enable digital I/O.
+ - microchip,analog: Enable analog I/O.
+
+Example:
+
+pic32_pinctrl: pinctrl@1f801400{
+ #address-cells = <1>;
+ #size-cells = <1>;
+ compatible = "microchip,pic32mzda-pinctrl";
+ reg = <0x1f801400 0x400>;
+ clocks = <&PBCLK1>;
+
+ pinctrl_uart2: pinctrl_uart2 {
+ uart2-tx {
+ pins = "G9";
+ function = "U2TX";
+ microchip,digital;
+ output-low;
+ };
+ uart2-rx {
+ pins = "B0";
+ function = "U2RX";
+ microchip,digital;
+ input-enable;
+ };
+ };
+};
+
+uart2: serial@1f822200 {
+ compatible = "microchip,pic32mzda-uart";
+ reg = <0x1f822200 0x50>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_uart2>;
+};
--
1.7.9.5
