# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
%YAML 1.2
---
$id: http://devicetree.org/schemas/pinctrl/starfive,jh7100-pinctrl.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: StarFive JH7100 Pin Controller
description: |
Bindings for the JH7100 RISC-V SoC from StarFive Ltd.
Out of the SoC's many pins only the ones named PAD_GPIO[0] to PAD_GPIO[63]
and PAD_FUNC_SHARE[0] to PAD_FUNC_SHARE[141] can be multiplexed and have
configurable bias, drive strength, schmitt trigger etc. The SoC has an
interesting 2-layered approach to pin muxing best illustrated by the diagram
below.
Signal group 0, 1, ... or 6
___|___
| |
LCD output -----------------| |
CMOS Camera interface ------| |--- PAD_GPIO[0]
Ethernet PHY interface -----| MUX |--- PAD_GPIO[1]
... | | ...
| |--- PAD_GPIO[63]
-------- GPIO0 ------------| |
| -------|-- GPIO1 --------| |--- PAD_FUNC_SHARE[0]
| | | | | |--- PAD_FUNC_SHARE[1]
| | | | ... | | ...
| | | | | |--- PAD_FUNC_SHARE[141]
| | -----|---|-- GPIO63 ---| |
| | | | | | -------
UART0 UART1 --
The big MUX in the diagram only has 7 different ways of mapping peripherals
on the left to pins on the right. StarFive calls the 7 configurations "signal
groups".
However some peripherals have their I/O go through the 64 "GPIOs". The
diagram only shows UART0 and UART1, but this also includes a number of other
UARTs, I2Cs, SPIs, PWMs etc. All these peripherals are connected to all 64
GPIOs such that any GPIO can be set up to be controlled by any of the
peripherals.
Note that signal group 0 doesn't map any of the GPIOs to pins, and only
signal group 1 maps the GPIOs to the pins named PAD_GPIO[0] to PAD_GPIO[63].
maintainers:
- Emil Renner Berthing <kernel@esmil.dk>
- Drew Fustini <drew@beagleboard.org>
properties:
compatible:
const: starfive,jh7100-pinctrl
reg:
minItems: 2
maxItems: 2
reg-names:
items:
- const: gpio
- const: padctl
clocks:
maxItems: 1
resets:
maxItems: 1
gpio-controller: true
"#gpio-cells":
const: 2
interrupts:
maxItems: 1
description: The GPIO parent interrupt.
interrupt-controller: true
"#interrupt-cells":
const: 2
starfive,signal-group:
description: |
Select one of the 7 signal groups. If this property is not set it
defaults to the configuration already chosen by the earlier boot stages.
$ref: /schemas/types.yaml#/definitions/uint32
enum: [0, 1, 2, 3, 4, 5, 6]
required:
- compatible
- reg
- reg-names
- clocks
- gpio-controller
- "#gpio-cells"
- interrupts
- interrupt-controller
- "#interrupt-cells"
patternProperties:
'-[0-9]+$':
type: object
patternProperties:
'-pins$':
type: object
description: |
A pinctrl node should contain at least one subnode representing the
pinctrl groups available on the machine. Each subnode will list the
pins it needs, and how they should be configured, with regard to
muxer configuration, bias, input enable/disable, input schmitt
trigger enable/disable, slew-rate and drive strength.
$ref: /schemas/pinctrl/pincfg-node.yaml
properties:
pins:
description: |
The list of pin identifiers that properties in the node apply to.
This should be set using either the PAD_GPIO or PAD_FUNC_SHARE
macros.
Either this or "pinmux" has to be specified, but not both.
$ref: /schemas/pinctrl/pinmux-node.yaml#/properties/pins
pinmux:
description: |
The list of GPIOs and their mux settings that properties in the
node apply to. This should be set using the GPIOMUX macro.
Either this or "pins" has to be specified, but not both.
$ref: /schemas/pinctrl/pinmux-node.yaml#/properties/pinmux
bias-disable: true
bias-pull-up:
type: boolean
bias-pull-down:
type: boolean
drive-strength:
enum: [ 14, 21, 28, 35, 42, 49, 56, 63 ]
input-enable: true
input-disable: true
input-schmitt-enable: true
input-schmitt-disable: true
slew-rate:
maximum: 7
starfive,strong-pull-up:
description: enable strong pull-up.
type: boolean
additionalProperties: false
additionalProperties: false
additionalProperties: false
examples:
- |
#include <dt-bindings/clock/starfive-jh7100.h>
#include <dt-bindings/reset/starfive-jh7100.h>
#include <dt-bindings/pinctrl/pinctrl-starfive-jh7100.h>
soc {
#address-cells = <2>;
#size-cells = <2>;
pinctrl@11910000 {
compatible = "starfive,jh7100-pinctrl";
reg = <0x0 0x11910000 0x0 0x10000>,
<0x0 0x11858000 0x0 0x1000>;
reg-names = "gpio", "padctl";
clocks = <&clkgen JH7100_CLK_GPIO_APB>;
resets = <&clkgen JH7100_RSTN_GPIO_APB>;
interrupts = <32>;
gpio-controller;
#gpio-cells = <2>;
interrupt-controller;
#interrupt-cells = <2>;
starfive,signal-group = <6>;
gmac_pins_default: gmac-0 {
gtxclk-pins {
pins = <PAD_FUNC_SHARE(115)>;
bias-pull-up;
drive-strength = <35>;
input-enable;
input-schmitt-enable;
slew-rate = <0>;
};
miitxclk-pins {
pins = <PAD_FUNC_SHARE(116)>;
bias-pull-up;
drive-strength = <14>;
input-enable;
input-schmitt-disable;
slew-rate = <0>;
};
tx-pins {
pins = <PAD_FUNC_SHARE(117)>,
<PAD_FUNC_SHARE(119)>,
<PAD_FUNC_SHARE(120)>,
<PAD_FUNC_SHARE(121)>,
<PAD_FUNC_SHARE(122)>,
<PAD_FUNC_SHARE(123)>,
<PAD_FUNC_SHARE(124)>,
<PAD_FUNC_SHARE(125)>,
<PAD_FUNC_SHARE(126)>;
bias-disable;
drive-strength = <35>;
input-disable;
input-schmitt-disable;
slew-rate = <0>;
};
rxclk-pins {
pins = <PAD_FUNC_SHARE(127)>;
bias-pull-up;
drive-strength = <14>;
input-enable;
input-schmitt-disable;
slew-rate = <6>;
};
rxer-pins {
pins = <PAD_FUNC_SHARE(129)>;
bias-pull-up;
drive-strength = <14>;
input-enable;
input-schmitt-disable;
slew-rate = <0>;
};
rx-pins {
pins = <PAD_FUNC_SHARE(128)>,
<PAD_FUNC_SHARE(130)>,
<PAD_FUNC_SHARE(131)>,
<PAD_FUNC_SHARE(132)>,
<PAD_FUNC_SHARE(133)>,
<PAD_FUNC_SHARE(134)>,
<PAD_FUNC_SHARE(135)>,
<PAD_FUNC_SHARE(136)>,
<PAD_FUNC_SHARE(137)>,
<PAD_FUNC_SHARE(138)>,
<PAD_FUNC_SHARE(139)>,
<PAD_FUNC_SHARE(140)>,
<PAD_FUNC_SHARE(141)>;
bias-pull-up;
drive-strength = <14>;
input-enable;
input-schmitt-enable;
slew-rate = <0>;
};
};
i2c0_pins_default: i2c0-0 {
i2c-pins {
pinmux = <GPIOMUX(62, GPO_LOW,
GPO_I2C0_PAD_SCK_OEN,
GPI_I2C0_PAD_SCK_IN)>,
<GPIOMUX(61, GPO_LOW,
GPO_I2C0_PAD_SDA_OEN,
GPI_I2C0_PAD_SDA_IN)>;
bias-disable; /* external pull-up */
input-enable;
input-schmitt-enable;
};
};
uart3_pins_default: uart3-0 {
rx-pins {
pinmux = <GPIOMUX(13, GPO_LOW, GPO_DISABLE,
GPI_UART3_PAD_SIN)>;
bias-pull-up;
input-enable;
input-schmitt-enable;
};
tx-pins {
pinmux = <GPIOMUX(14, GPO_UART3_PAD_SOUT,
GPO_ENABLE, GPI_NONE)>;
bias-disable;
input-disable;
input-schmitt-disable;
};
};
};
gmac {
pinctrl-0 = <&gmac_pins_default>;
pinctrl-names = "default";
};
i2c {
pinctrl-0 = <&i2c0_pins_default>;
pinctrl-names = "default";
};
uart3 {
pinctrl-0 = <&uart3_pins_default>;
pinctrl-names = "default";
};
};
...