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|
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/pinctrl/mediatek,mt6797-pinctrl.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Mediatek MT6797 Pin Controller Device Tree Bindings
maintainers:
- Sean Wang <sean.wang@kernel.org>
description: |+
The MediaTek's MT6797 Pin controller is used to control SoC pins.
properties:
compatible:
const: mediatek,mt6797-pinctrl
reg:
minItems: 5
maxItems: 5
reg-names:
items:
- const: gpio
- const: iocfgl
- const: iocfgb
- const: iocfgr
- const: iocfgt
gpio-controller: true
"#gpio-cells":
const: 2
description: |
Number of cells in GPIO specifier. Since the generic GPIO
binding is used, the amount of cells must be specified as 2. See the below
mentioned gpio binding representation for description of particular cells.
interrupt-controller: true
interrupts:
maxItems: 1
"#interrupt-cells":
const: 2
required:
- compatible
- reg
- reg-names
- gpio-controller
- "#gpio-cells"
patternProperties:
'-[0-9]+$':
type: object
additionalProperties: false
patternProperties:
'pins':
type: object
additionalProperties: false
description: |
A pinctrl node should contain at least one subnodes 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, pullups, drive strength, input enable/disable and input
schmitt.
$ref: "/schemas/pinctrl/pincfg-node.yaml"
properties:
pinmux:
description:
integer array, represents gpio pin number and mux setting.
Supported pin number and mux varies for different SoCs, and are
defined as macros in <soc>-pinfunc.h directly.
bias-disable: true
bias-pull-up: true
bias-pull-down: true
input-enable: true
input-disable: true
output-enable: true
output-low: true
output-high: true
input-schmitt-enable: true
input-schmitt-disable: true
drive-strength:
enum: [2, 4, 8, 12, 16]
slew-rate:
enum: [0, 1]
mediatek,pull-up-adv:
description: |
Pull up setings for 2 pull resistors, R0 and R1. User can
configure those special pins. Valid arguments are described as below:
0: (R1, R0) = (0, 0) which means R1 disabled and R0 disabled.
1: (R1, R0) = (0, 1) which means R1 disabled and R0 enabled.
2: (R1, R0) = (1, 0) which means R1 enabled and R0 disabled.
3: (R1, R0) = (1, 1) which means R1 enabled and R0 enabled.
$ref: /schemas/types.yaml#/definitions/uint32
enum: [0, 1, 2, 3]
mediatek,pull-down-adv:
description: |
Pull down settings for 2 pull resistors, R0 and R1. User can
configure those special pins. Valid arguments are described as below:
0: (R1, R0) = (0, 0) which means R1 disabled and R0 disabled.
1: (R1, R0) = (0, 1) which means R1 disabled and R0 enabled.
2: (R1, R0) = (1, 0) which means R1 enabled and R0 disabled.
3: (R1, R0) = (1, 1) which means R1 enabled and R0 enabled.
$ref: /schemas/types.yaml#/definitions/uint32
enum: [0, 1, 2, 3]
mediatek,tdsel:
description: |
An integer describing the steps for output level shifter duty
cycle when asserted (high pulse width adjustment). Valid arguments
are from 0 to 15.
$ref: /schemas/types.yaml#/definitions/uint32
mediatek,rdsel:
description: |
An integer describing the steps for input level shifter duty cycle
when asserted (high pulse width adjustment). Valid arguments are
from 0 to 63.
$ref: /schemas/types.yaml#/definitions/uint32
required:
- pinmux
additionalProperties: false
examples:
- |
#include <dt-bindings/interrupt-controller/irq.h>
#include <dt-bindings/interrupt-controller/arm-gic.h>
#include <dt-bindings/pinctrl/mt6797-pinfunc.h>
soc {
#address-cells = <2>;
#size-cells = <2>;
pio: pinctrl@10005000 {
compatible = "mediatek,mt6797-pinctrl";
reg = <0 0x10005000 0 0x1000>,
<0 0x10002000 0 0x400>,
<0 0x10002400 0 0x400>,
<0 0x10002800 0 0x400>,
<0 0x10002C00 0 0x400>;
reg-names = "gpio", "iocfgl", "iocfgb", "iocfgr", "iocfgt";
gpio-controller;
#gpio-cells = <2>;
uart_pins_a: uart-0 {
pins1 {
pinmux = <MT6797_GPIO232__FUNC_URXD1>,
<MT6797_GPIO233__FUNC_UTXD1>;
};
};
};
};
|
