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97b7675640
Add dt-bindings for the pinctrl driver of SpacemiT's K1 SoC. Reviewed-by: Rob Herring (Arm) <robh@kernel.org> Signed-off-by: Yixun Lan <dlan@gentoo.org> Link: https://lore.kernel.org/20241016-02-k1-pinctrl-v5-1-03d395222e4f@gentoo.org Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
125 lines
3.2 KiB
YAML
125 lines
3.2 KiB
YAML
# 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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$id: http://devicetree.org/schemas/pinctrl/spacemit,k1-pinctrl.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: SpacemiT K1 SoC Pin Controller
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maintainers:
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- Yixun Lan <dlan@gentoo.org>
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properties:
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compatible:
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const: spacemit,k1-pinctrl
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reg:
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items:
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- description: pinctrl io memory base
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patternProperties:
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'-cfg$':
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type: object
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additionalProperties: false
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description:
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A pinctrl node should contain at least one subnode representing the
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pinctrl groups available on the machine.
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patternProperties:
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'-pins$':
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type: object
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additionalProperties: false
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description:
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Each subnode will list the pins it needs, and how they should
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be configured, with regard to muxer configuration, bias pull,
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drive strength, input schmitt trigger, slew rate, power source.
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allOf:
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- $ref: pincfg-node.yaml#
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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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The list of GPIOs and their mux settings that properties in the
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node apply to. This should be set using the K1_PADCONF macro to
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construct the value.
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bias-disable: true
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bias-pull-down: true
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bias-pull-up:
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description: |
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typical value for selecting bias pull up or strong pull up.
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0: normal bias pull up
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1: strong bias pull up
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enum: [ 0, 1 ]
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drive-strength:
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description: |
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typical current when output high level.
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1.8V output: 11, 21, 32, 42 (mA)
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3.3V output: 7, 10, 13, 16, 19, 23, 26, 29 (mA)
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input-schmitt:
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description: |
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typical threshold for schmitt trigger.
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0: buffer mode
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1: trigger mode
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2, 3: trigger mode
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$ref: /schemas/types.yaml#/definitions/uint32
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enum: [ 0, 1, 2, 3 ]
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power-source:
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description: external power supplies at 1.8v or 3.3v.
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enum: [ 1800, 3300 ]
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slew-rate:
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description: |
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slew rate for output buffer.
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0: disable it
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1: enable it (via bundled value from drive strength)
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2: slow speed 0
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3: slow speed 1
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4: medium speed
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5: fast speed
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enum: [ 0, 1, 2, 3, 4, 5 ]
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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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additionalProperties: false
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examples:
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- |
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#define K1_PADCONF(pin, func) (((pin) << 16) | (func))
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soc {
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#address-cells = <2>;
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#size-cells = <2>;
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pinctrl@d401e000 {
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compatible = "spacemit,k1-pinctrl";
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reg = <0x0 0xd401e000 0x0 0x400>;
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uart0_2_cfg: uart0-2-cfg {
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uart0-2-pins {
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pinmux = <K1_PADCONF(68, 2)>,
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<K1_PADCONF(69, 2)>;
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bias-pull-up = <0>;
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drive-strength = <32>;
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};
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};
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};
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};
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...
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