forked from Minki/linux
dt-bindings: pinctrl: mt8186: add pinctrl file and binding document
1. This patch adds pinctrl file for mt8186. 2. This patch adds mt8186 compatible node in binding document. Signed-off-by: Guodong Liu <guodong.liu@mediatek.com> Reviewed-by: Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/20220216032124.28067-2-guodong.liu@mediatek.com Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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Guodong Liu
Linus Walleij
parent
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commit
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297
Documentation/devicetree/bindings/pinctrl/pinctrl-mt8186.yaml
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297
Documentation/devicetree/bindings/pinctrl/pinctrl-mt8186.yaml
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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/pinctrl/pinctrl-mt8186.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Mediatek MT8186 Pin Controller
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maintainers:
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- Sean Wang <sean.wang@mediatek.com>
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description: |
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The Mediatek's Pin controller is used to control SoC pins.
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properties:
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compatible:
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const: mediatek,mt8186-pinctrl
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gpio-controller: true
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'#gpio-cells':
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description: |
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Number of cells in GPIO specifier. Since the generic GPIO binding is used,
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the amount of cells must be specified as 2. See the below
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mentioned gpio binding representation for description of particular cells.
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const: 2
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gpio-ranges:
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maxItems: 1
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reg:
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description: |
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Physical address base for gpio base registers. There are 8 different GPIO
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physical address base in mt8186.
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maxItems: 8
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reg-names:
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description: |
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Gpio base register names.
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items:
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- const: iocfg0
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- const: iocfg_bm
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- const: iocfg_bl
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- const: iocfg_br
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- const: iocfg_lm
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- const: iocfg_rb
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- const: iocfg_tl
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- const: eint
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interrupt-controller: true
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'#interrupt-cells':
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const: 2
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interrupts:
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description: The interrupt outputs to sysirq
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maxItems: 1
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mediatek,rsel-resistance-in-si-unit:
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type: boolean
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description: |
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Identifying i2c pins pull up/down type which is RSEL. It can support
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RSEL define or si unit value(ohm) to set different resistance.
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# PIN CONFIGURATION NODES
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patternProperties:
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'-pins$':
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type: object
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additionalProperties: false
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patternProperties:
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'^pins':
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type: object
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additionalProperties: false
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description: |
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A pinctrl node should contain at least one subnodes representing the
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pinctrl groups available on the machine. Each subnode will list the
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pins it needs, and how they should be configured, with regard to muxer
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configuration, pullups, drive strength, input enable/disable and
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input schmitt.
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An example of using macro:
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pincontroller {
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/* GPIO0 set as multifunction GPIO0 */
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gpio-pins {
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pins {
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pinmux = <PINMUX_GPIO0__FUNC_GPIO0>;
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}
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};
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/* GPIO128 set as multifunction SDA0 */
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i2c0-pins {
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pins {
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pinmux = <PINMUX_GPIO128__FUNC_SDA0>;
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}
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};
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};
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$ref: "pinmux-node.yaml"
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properties:
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pinmux:
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description: |
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Integer array, represents gpio pin number and mux setting.
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Supported pin number and mux varies for different SoCs, and are
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defined as macros in dt-bindings/pinctrl/<soc>-pinfunc.h
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directly.
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drive-strength:
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enum: [2, 4, 6, 8, 10, 12, 14, 16]
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mediatek,drive-strength-adv:
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description: |
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Describe the specific driving setup property.
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For I2C pins, the existing generic driving setup can only support
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2/4/6/8/10/12/14/16mA driving. But in specific driving setup, they
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can support 0.125/0.25/0.5/1mA adjustment. If we enable specific
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driving setup, the existing generic setup will be disabled.
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The specific driving setup is controlled by E1E0EN.
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When E1=0/E0=0, the strength is 0.125mA.
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When E1=0/E0=1, the strength is 0.25mA.
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When E1=1/E0=0, the strength is 0.5mA.
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When E1=1/E0=1, the strength is 1mA.
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EN is used to enable or disable the specific driving setup.
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Valid arguments are described as below:
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0: (E1, E0, EN) = (0, 0, 0)
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1: (E1, E0, EN) = (0, 0, 1)
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2: (E1, E0, EN) = (0, 1, 0)
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3: (E1, E0, EN) = (0, 1, 1)
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4: (E1, E0, EN) = (1, 0, 0)
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5: (E1, E0, EN) = (1, 0, 1)
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6: (E1, E0, EN) = (1, 1, 0)
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7: (E1, E0, EN) = (1, 1, 1)
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So the valid arguments are from 0 to 7.
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$ref: /schemas/types.yaml#/definitions/uint32
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enum: [0, 1, 2, 3, 4, 5, 6, 7]
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bias-pull-down:
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oneOf:
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- type: boolean
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- enum: [100, 101, 102, 103]
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description: mt8186 pull down PUPD/R0/R1 type define value.
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- enum: [200, 201, 202, 203]
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description: mt8186 pull down RSEL type define value.
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- enum: [75000, 5000]
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description: mt8186 pull down RSEL type si unit value(ohm).
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description: |
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For pull down type is normal, it don't need add RSEL & R1R0 define
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and resistance value.
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For pull down type is PUPD/R0/R1 type, it can add R1R0 define to
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set different resistance. It can support "MTK_PUPD_SET_R1R0_00" &
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"MTK_PUPD_SET_R1R0_01" & "MTK_PUPD_SET_R1R0_10" &
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"MTK_PUPD_SET_R1R0_11" define in mt8186.
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For pull down type is RSEL, it can add RSEL define & resistance
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value(ohm) to set different resistance by identifying property
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"mediatek,rsel-resistance-in-si-unit".
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It can support "MTK_PULL_SET_RSEL_000" & "MTK_PULL_SET_RSEL_001"
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& "MTK_PULL_SET_RSEL_010" & "MTK_PULL_SET_RSEL_011"
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define in mt8186. It can also support resistance value(ohm)
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"75000" & "5000" in mt8186.
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An example of using RSEL define:
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pincontroller {
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i2c0_pin {
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pins {
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pinmux = <PINMUX_GPIO128__FUNC_SDA0>;
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bias-pull-down = <MTK_PULL_SET_RSEL_001>;
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}
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};
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};
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An example of using si unit resistance value(ohm):
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&pio {
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mediatek,rsel-resistance-in-si-unit;
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}
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pincontroller {
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i2c0_pin {
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pins {
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pinmux = <PINMUX_GPIO128__FUNC_SDA0>;
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bias-pull-down = <75000>;
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}
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};
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};
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bias-pull-up:
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oneOf:
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- type: boolean
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- enum: [100, 101, 102, 103]
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description: mt8186 pull up PUPD/R0/R1 type define value.
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- enum: [200, 201, 202, 203]
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description: mt8186 pull up RSEL type define value.
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- enum: [1000, 5000, 10000, 75000]
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description: mt8186 pull up RSEL type si unit value(ohm).
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description: |
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For pull up type is normal, it don't need add RSEL & R1R0 define
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and resistance value.
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For pull up type is PUPD/R0/R1 type, it can add R1R0 define to
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set different resistance. It can support "MTK_PUPD_SET_R1R0_00" &
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"MTK_PUPD_SET_R1R0_01" & "MTK_PUPD_SET_R1R0_10" &
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"MTK_PUPD_SET_R1R0_11" define in mt8186.
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For pull up type is RSEL, it can add RSEL define & resistance
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value(ohm) to set different resistance by identifying property
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"mediatek,rsel-resistance-in-si-unit".
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It can support "MTK_PULL_SET_RSEL_000" & "MTK_PULL_SET_RSEL_001"
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& "MTK_PULL_SET_RSEL_010" & "MTK_PULL_SET_RSEL_011"
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define in mt8186. It can also support resistance value(ohm)
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"1000" & "5000" & "10000" & "75000" in mt8186.
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An example of using si unit resistance value(ohm):
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&pio {
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mediatek,rsel-resistance-in-si-unit;
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}
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pincontroller {
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i2c0-pins {
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pins {
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pinmux = <PINMUX_GPIO128__FUNC_SDA0>;
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bias-pull-up = <1000>;
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}
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};
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};
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bias-disable: true
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output-high: true
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output-low: true
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input-enable: true
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input-disable: true
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input-schmitt-enable: true
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input-schmitt-disable: true
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required:
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- pinmux
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required:
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- compatible
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- reg
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- interrupts
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- interrupt-controller
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- '#interrupt-cells'
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- gpio-controller
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- '#gpio-cells'
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- gpio-ranges
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additionalProperties: false
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examples:
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- |
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#include <dt-bindings/pinctrl/mt8186-pinfunc.h>
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#include <dt-bindings/interrupt-controller/arm-gic.h>
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pio: pinctrl@10005000 {
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compatible = "mediatek,mt8186-pinctrl";
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reg = <0x10005000 0x1000>,
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<0x10002000 0x0200>,
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<0x10002200 0x0200>,
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<0x10002400 0x0200>,
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<0x10002600 0x0200>,
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<0x10002A00 0x0200>,
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<0x10002c00 0x0200>,
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<0x1000b000 0x1000>;
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reg-names = "iocfg0", "iocfg_bm", "iocfg_bl",
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"iocfg_br", "iocfg_lm", "iocfg_rb",
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"iocfg_tl", "eint";
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gpio-controller;
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#gpio-cells = <2>;
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gpio-ranges = <&pio 0 0 185>;
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interrupt-controller;
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interrupts = <GIC_SPI 186 IRQ_TYPE_LEVEL_HIGH 0>;
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#interrupt-cells = <2>;
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pio-pins {
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pins {
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pinmux = <PINMUX_GPIO0__FUNC_GPIO0>;
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output-low;
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};
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};
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spi0-pins {
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pins-spi {
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pinmux = <PINMUX_GPIO0__FUNC_SPI0_CLK_B>,
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<PINMUX_GPIO1__FUNC_SPI0_CSB_B>,
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<PINMUX_GPIO2__FUNC_SPI0_MO_B>;
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bias-disable;
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};
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pins-spi-mi {
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pinmux = <PINMUX_GPIO3__FUNC_SPI0_MI_B>;
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bias-pull-down;
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};
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};
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i2c0-pins {
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pins {
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pinmux = <PINMUX_GPIO127__FUNC_SCL0>,
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<PINMUX_GPIO128__FUNC_SDA0>;
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bias-pull-up = <MTK_PULL_SET_RSEL_001>;
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mediatek,drive-strength-adv = <7>;
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};
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};
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};
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1174
include/dt-bindings/pinctrl/mt8186-pinfunc.h
Normal file
1174
include/dt-bindings/pinctrl/mt8186-pinfunc.h
Normal file
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