mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-17 08:43:07 +00:00
f031bb304d
Document slew-rate DT binding for SAMA7G5. Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
69 lines
1.6 KiB
Text
69 lines
1.6 KiB
Text
* 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.
|
|
|
|
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
|
|
- slew-rate: 0 - disabled, 1 - enabled (default)
|
|
- atmel,drive-strength: 0 or 1 for low drive, 2 for medium drive and 3 for
|
|
high drive. The default value is low drive.
|
|
|
|
Example:
|
|
|
|
#include <sama5d2-pinfunc.h>
|
|
|
|
...
|
|
{
|
|
spi0: spi@f8000000 {
|
|
cs-gpios = <&pioA 17 0>, <0>, <0>, <0>;
|
|
pinctrl-names = "default";
|
|
pinctrl-0 = <&pinctrl_spi0_default>;
|
|
status = "okay";
|
|
|
|
spi_flash@0 {
|
|
compatible = "jedec,spi-nor";
|
|
reg = <0>;
|
|
spi-max-frequency = <50000000>;
|
|
};
|
|
};
|
|
|
|
...
|
|
|
|
pioA: pinctrl@fc038000 {
|
|
compatible = "atmel,sama5d2-pinctrl";
|
|
reg = <0xfc038000 0x600>;
|
|
|
|
pinctrl_spi0_default: spi0_default {
|
|
pinmux = <PIN_PA14__SPI0_SPCK>,
|
|
<PIN_PA15__SPI0_MOSI>,
|
|
<PIN_PA16__SPI0_MISO>;
|
|
bias-disable;
|
|
};
|
|
...
|
|
};
|
|
};
|
|
...
|