dt-bindings: add documentation for banks

Add documentation for at91 pin controller banks.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/Documentation/devicetree/bindings/pinctrl/atmel,at91-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/atmel,at91-pinctrl.txt
index 3e23fec..40e33df 100644 (file)
--- a/Documentation/devicetree/bindings/pinctrl/atmel,at91-pinctrl.txt
+++ b/Documentation/devicetree/bindings/pinctrl/atmel,at91-pinctrl.txt
@@ -116,6 +116,18 @@ Some requirements for using atmel,at91rm9200-pinctrl binding:
    configurations by referring to the phandle of that pin configuration node.
 4. The gpio controller must be describe in the pinctrl simple-bus.
 
+For each bank the required properties are:
+- compatible: "atmel,at91sam9x5-gpio" or "atmel,at91rm9200-gpio"
+- reg: physical base address and length of the controller's registers
+- interrupts: interrupt outputs from the controller
+- interrupt-controller: marks the device node as an interrupt controller
+- #interrupt-cells: should be 2; refer to ../interrupt-controller/interrupts.txt
+  for more details.
+- gpio-controller
+- #gpio-cells: should be 2; the first cell is the GPIO number and the second
+  cell specifies GPIO flags as defined in <dt-bindings/gpio/gpio.h>.
+- clocks: bank clock
+
 Examples:
 
 pinctrl@fffff400 {
@@ -125,6 +137,17 @@ pinctrl@fffff400 {
        compatible = "atmel,at91rm9200-pinctrl", "simple-bus";
        reg = <0xfffff400 0x600>;
 
+       pioA: gpio@fffff400 {
+               compatible = "atmel,at91sam9x5-gpio";
+               reg = <0xfffff400 0x200>;
+               interrupts = <2 IRQ_TYPE_LEVEL_HIGH 1>;
+               #gpio-cells = <2>;
+               gpio-controller;
+               interrupt-controller;
+               #interrupt-cells = <2>;
+               clocks = <&pmc PMC_TYPE_PERIPHERAL 2>;
+       };
+
        atmel,mux-mask = <
              /*    A         B     */
               0xffffffff 0xffc00c3b  /* pioA */