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dt-bindings: add documentation for banks

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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>
This commit is contained in:
Claudiu Beznea 2019-02-07 09:24:57 +00:00 committed by Linus Walleij
parent a2fcb1ce88
commit 1d741f2e97
1 changed files with 23 additions and 0 deletions
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23
Documentation/devicetree/bindings/pinctrl/atmel,at91-pinctrl.txt
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@ -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 */