mirror of
https://github.com/torvalds/linux.git
synced 2024-11-19 18:41:48 +00:00
56d7942224
Add documentation for the Atmel PIO4 controller introduced with SAMA5D2 chip family. Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com> Acked-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
91 lines
2.3 KiB
Plaintext
91 lines
2.3 KiB
Plaintext
* Atmel PIO4 Controller
|
|
|
|
The Atmel PIO4 controller is used to select the function of a pin and to
|
|
configure it.
|
|
|
|
Required properties:
|
|
- compatible: "atmel,sama5d2-pinctrl".
|
|
- reg: base address and length of the PIO controller.
|
|
- interrupts: interrupt outputs from the controller, one for each bank.
|
|
- interrupt-controller: mark the device node as an interrupt controller.
|
|
- #interrupt-cells: should be two.
|
|
- gpio-controller: mark the device node as a gpio controller.
|
|
- #gpio-cells: should be two.
|
|
|
|
Please refer to ../gpio/gpio.txt and ../interrupt-controller/interrupts.txt for
|
|
a general description of GPIO and interrupt bindings.
|
|
|
|
Please refer to pinctrl-bindings.txt in this directory for details of the
|
|
common pinctrl bindings used by client devices.
|
|
|
|
Subnode format
|
|
Each node (or subnode) will list the pins it needs and how to configured these
|
|
pins.
|
|
|
|
node {
|
|
pinmux = <PIN_NUMBER_PINMUX>;
|
|
GENERIC_PINCONFIG;
|
|
};
|
|
|
|
Required properties:
|
|
- pinmux: integer array. Each integer represents a pin number plus mux and
|
|
ioset settings. Use the macros from boot/dts/<soc>-pinfunc.h file to get the
|
|
right representation of the pin.
|
|
|
|
Optional properties:
|
|
- GENERIC_PINCONFIG: generic pinconfig options to use, bias-disable,
|
|
bias-pull-down, bias-pull-up, drive-open-drain, input-schmitt-enable,
|
|
input-debounce, output-low, output-high.
|
|
|
|
Example:
|
|
|
|
#include <sama5d2-pinfunc.h>
|
|
|
|
...
|
|
{
|
|
pioA: pinctrl@fc038000 {
|
|
compatible = "atmel,sama5d2-pinctrl";
|
|
reg = <0xfc038000 0x600>;
|
|
interrupts = <18 IRQ_TYPE_LEVEL_HIGH 7>,
|
|
<68 IRQ_TYPE_LEVEL_HIGH 7>,
|
|
<69 IRQ_TYPE_LEVEL_HIGH 7>,
|
|
<70 IRQ_TYPE_LEVEL_HIGH 7>;
|
|
interrupt-controller;
|
|
#interrupt-cells = <2>;
|
|
gpio-controller;
|
|
#gpio-cells = <2>;
|
|
clocks = <&pioA_clk>;
|
|
|
|
pinctrl_i2c0_default: i2c0_default {
|
|
pinmux = <PIN_PD21__TWD0>,
|
|
<PIN_PD22__TWCK0>;
|
|
bias-disable;
|
|
};
|
|
|
|
pinctrl_led_gpio_default: led_gpio_default {
|
|
pinmux = <PIN_PB0>,
|
|
<PIN_PB5>;
|
|
bias-pull-up;
|
|
};
|
|
|
|
pinctrl_sdmmc1_default: sdmmc1_default {
|
|
cmd_data {
|
|
pinmux = <PIN_PA28__SDMMC1_CMD>,
|
|
<PIN_PA18__SDMMC1_DAT0>,
|
|
<PIN_PA19__SDMMC1_DAT1>,
|
|
<PIN_PA20__SDMMC1_DAT2>,
|
|
<PIN_PA21__SDMMC1_DAT3>;
|
|
bias-pull-up;
|
|
};
|
|
|
|
ck_cd {
|
|
pinmux = <PIN_PA22__SDMMC1_CK>,
|
|
<PIN_PA30__SDMMC1_CD>;
|
|
bias-disable;
|
|
};
|
|
};
|
|
...
|
|
};
|
|
};
|
|
...
|