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Diffstat (limited to 'Documentation/devicetree/bindings/pinctrl/microchip,mcp23s08.yaml')
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diff --git a/Documentation/devicetree/bindings/pinctrl/microchip,mcp23s08.yaml b/Documentation/devicetree/bindings/pinctrl/microchip,mcp23s08.yaml new file mode 100644 index 000000000000..e07f4723de17 --- /dev/null +++ b/Documentation/devicetree/bindings/pinctrl/microchip,mcp23s08.yaml @@ -0,0 +1,161 @@ +# SPDX-License-Identifier: GPL-2.0-only +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/pinctrl/microchip,mcp23s08.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Microchip I/O expander with serial interface (I2C/SPI) + +maintainers: + - Himanshu Bhavani <himanshu.bhavani@siliconsignals.io> + +description: + Microchip MCP23008, MCP23017, MCP23S08, MCP23S17, MCP23S18 GPIO expander + chips.These chips provide 8 or 16 GPIO pins with either I2C or SPI interface. + +allOf: + - $ref: /schemas/spi/spi-peripheral-props.yaml# + +properties: + compatible: + enum: + - microchip,mcp23s08 + - microchip,mcp23s17 + - microchip,mcp23s18 + - microchip,mcp23008 + - microchip,mcp23017 + - microchip,mcp23018 + + reg: + maxItems: 1 + + gpio-controller: true + + '#gpio-cells': + const: 2 + + interrupt-controller: true + + '#interrupt-cells': + const: 2 + + interrupts: + maxItems: 1 + + reset-gpios: + description: GPIO specifier for active-low reset pin. + maxItems: 1 + + microchip,spi-present-mask: + description: + Multiple SPI chips can share the same SPI chipselect. Set a bit in + bit0-7 in this mask to 1 if there is a chip connected with the + corresponding spi address set. For example if you have a chip with + address 3 connected, you have to set bit3 to 1, which is 0x08. mcp23s08 + chip variant only supports bits 0-3. It is not possible to mix mcp23s08 + and mcp23s17 on the same chipselect. Set at least one bit to 1 for SPI + chips. + $ref: /schemas/types.yaml#/definitions/uint8 + + microchip,irq-mirror: + type: boolean + description: + Sets the mirror flag in the IOCON register. Devices with two interrupt + outputs (these are the devices ending with 17 and those that have 16 IOs) + have two IO banks IO 0-7 form bank 1 and IO 8-15 are bank 2. These chips + have two different interrupt outputs One for bank 1 and another for + bank 2. If irq-mirror is set, both interrupts are generated regardless of + the bank that an input change occurred on. If it is not set,the interrupt + are only generated for the bank they belong to. + + microchip,irq-active-high: + type: boolean + description: + Sets the INTPOL flag in the IOCON register.This configures the IRQ output + polarity as active high. + + drive-open-drain: + type: boolean + description: + Sets the ODR flag in the IOCON register. This configures the IRQ output as + open drain active low. + + pinmux: + type: object + properties: + pins: + description: + The list of GPIO pins controlled by this node. Each pin name + corresponds to a physical pin on the GPIO expander. + items: + pattern: '^gpio([0-9]|[1][0-5])$' + maxItems: 16 + + bias-pull-up: + type: boolean + description: + Configures pull-up resistors for the GPIO pins. Absence of this + property will leave the configuration in its default state. + + required: + - pins + + additionalProperties: false + +required: + - compatible + - reg + - gpio-controller + - '#gpio-cells' + +unevaluatedProperties: false + +examples: + - | + #include <dt-bindings/interrupt-controller/irq.h> + #include <dt-bindings/gpio/gpio.h> + + i2c { + #address-cells = <1>; + #size-cells = <0>; + + gpio@21 { + compatible = "microchip,mcp23017"; + reg = <0x21>; + gpio-controller; + #gpio-cells = <2>; + + interrupt-parent = <&gpio1>; + interrupts = <17 IRQ_TYPE_LEVEL_LOW>; + interrupt-controller; + #interrupt-cells = <2>; + + microchip,irq-mirror; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_i2c_gpio0>, <&gpiopullups>; + reset-gpios = <&gpio6 15 GPIO_ACTIVE_LOW>; + + gpiopullups: pinmux { + pins = "gpio0", "gpio1", "gpio2", "gpio3", + "gpio4", "gpio5", "gpio6", "gpio7", + "gpio8", "gpio9", "gpio10", "gpio11", + "gpio12", "gpio13", "gpio14", "gpio15"; + bias-pull-up; + }; + }; + }; + + - | + spi { + #address-cells = <1>; + #size-cells = <0>; + + gpio@0 { + compatible = "microchip,mcp23s17"; + reg = <0>; + gpio-controller; + #gpio-cells = <2>; + spi-max-frequency = <1000000>; + microchip,spi-present-mask = /bits/ 8 <0x01>; + }; + }; |