Add bindings for the pin controllers on the T-Head TH1520 RISC-V SoC. Signed-off-by: Emil Renner Berthing <emil.renner.berthing@xxxxxxxxxxxxx> --- .../pinctrl/thead,th1520-pinctrl.yaml | 156 ++++++++++++++++++ 1 file changed, 156 insertions(+) create mode 100644 Documentation/devicetree/bindings/pinctrl/thead,th1520-pinctrl.yaml diff --git a/Documentation/devicetree/bindings/pinctrl/thead,th1520-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/thead,th1520-pinctrl.yaml new file mode 100644 index 000000000000..1b1b446cd498 --- /dev/null +++ b/Documentation/devicetree/bindings/pinctrl/thead,th1520-pinctrl.yaml @@ -0,0 +1,156 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/pinctrl/thead,th1520-pinctrl.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: T-Head TH1520 SoC pin controller + +maintainers: + - Emil Renner Berthing <emil.renner.berthing@xxxxxxxxxxxxx> + +description: | + Pinmux and pinconf controller in the T-Head TH1520 RISC-V SoC. + + The TH1520 has 3 groups of pads each controlled from different memory ranges. + Confusingly the memory ranges are named + PADCTRL_AOSYS -> PAD Group 1 + PADCTRL1_APSYS -> PAD Group 2 + PADCTRL0_APSYS -> PAD Group 3 + + Each pad can be muxed individually to up to 5 different functions. For most + pads only a few of those 5 configurations are valid though, and a few pads in + group 1 does not support muxing at all. + + Pinconf is fairly regular except for a few pads in group 1 that either can't + be configured or has some special functions. The rest have configurable drive + strength, input enable, schmitt trigger, slew rate, pull-up and pull-down in + addition to a special strong pull up. + + Certain pads in group 1 can be muxed to AUDIO_PA0 - AUDIO_PA30 functions and + are then meant to be used by the audio co-processor. Each such pad can then + be further muxed to either audio GPIO or one of 4 functions such as UART, I2C + and I2S. If the audio pad is muxed to one of the 4 functions then pinconf is + also configured in different registers. All of this is done from a different + AUDIO_IOCTRL memory range and is left to the audio co-processor for now. + +properties: + compatible: + enum: + - thead,th1520-group1-pinctrl + - thead,th1520-group2-pinctrl + - thead,th1520-group3-pinctrl + + reg: + maxItems: 1 + +patternProperties: + '-[0-9]+$': + type: object + patternProperties: + '-pins$': + type: object + $ref: /schemas/pinctrl/pincfg-node.yaml + description: + A pinctrl node should contain at least one subnode describing one + or more pads and their associated pinmux and pinconf settings. + + properties: + pins: + $ref: /schemas/types.yaml#/definitions/string-array + description: List of pads that properties in the node apply to. + + function: + $ref: /schemas/types.yaml#/definitions/string + enum: [ "0", "1", "2", "3", "4", "5" ] + description: The mux function to select for the given pins. + + bias-disable: true + + bias-pull-up: + type: boolean + + bias-pull-down: + type: boolean + + drive-strength: + enum: [ 1, 2, 3, 5, 7, 8, 10, 12, 13, 15, 16, 18, 20, 21, 23, 25 ] + + input-enable: true + + input-disable: true + + input-schmitt-enable: true + + input-schmitt-disable: true + + slew-rate: + maximum: 1 + + thead,strong-pull-up: + oneOf: + - type: boolean + - $ref: /schemas/types.yaml#/definitions/uint32 + enum: [ 0, 2100 ] + description: Enable or disable strong 2.1kOhm pull-up. + + required: + - pins + + additionalProperties: false + + additionalProperties: false + +required: + - compatible + - reg + +additionalProperties: false + +examples: + - | + padctrl0_apsys: pinctrl@ec007000 { + compatible = "thead,th1520-group3-pinctrl"; + reg = <0xec007000 0x1000>; + + uart0_pins: uart0-0 { + tx-pins { + pins = "UART0_TXD"; + function = "0"; + bias-disable; + drive-strength = <3>; + input-disable; + input-schmitt-disable; + slew-rate = <0>; + }; + + rx-pins { + pins = "UART0_RXD"; + function = "0"; + bias-disable; + drive-strength = <1>; + input-enable; + input-schmitt-enable; + slew-rate = <0>; + }; + }; + }; + + padctrl1_apsys: pinctrl@e7f3c000 { + compatible = "thead,th1520-group2-pinctrl"; + reg = <0xe7f3c000 0x1000>; + + i2c5_pins: i2c5-0 { + i2c-pins { + pins = "QSPI1_CSN0", /* I2C5_SCL */ + "QSPI1_D0_MOSI"; /* I2C5_SDA */ + function = "2"; + bias-disable; + drive-strength = <7>; + input-enable; + input-schmitt-enable; + slew-rate = <0>; + thead,strong-pull-up; + }; + }; + }; -- 2.40.1
