diff options
Diffstat (limited to 'Documentation/devicetree/bindings/gpio/gpio-mcp23s08.txt')
| -rw-r--r-- | Documentation/devicetree/bindings/gpio/gpio-mcp23s08.txt | 83 |
1 files changed, 0 insertions, 83 deletions
diff --git a/Documentation/devicetree/bindings/gpio/gpio-mcp23s08.txt b/Documentation/devicetree/bindings/gpio/gpio-mcp23s08.txt deleted file mode 100644 index c934106b10aa..000000000000 --- a/Documentation/devicetree/bindings/gpio/gpio-mcp23s08.txt +++ /dev/null @@ -1,83 +0,0 @@ -Microchip MCP2308/MCP23S08/MCP23017/MCP23S17 driver for -8-/16-bit I/O expander with serial interface (I2C/SPI) - -Required properties: -- compatible : Should be - - "mcp,mcp23s08" (DEPRECATED) for 8 GPIO SPI version - - "mcp,mcp23s17" (DEPRECATED) for 16 GPIO SPI version - - "mcp,mcp23008" (DEPRECATED) for 8 GPIO I2C version or - - "mcp,mcp23017" (DEPRECATED) for 16 GPIO I2C version of the chip - - - "microchip,mcp23s08" for 8 GPIO SPI version - - "microchip,mcp23s17" for 16 GPIO SPI version - - "microchip,mcp23s18" for 16 GPIO SPI version - - "microchip,mcp23008" for 8 GPIO I2C version or - - "microchip,mcp23017" for 16 GPIO I2C version of the chip - NOTE: Do not use the old mcp prefix any more. It is deprecated and will be - removed. -- #gpio-cells : Should be two. - - first cell is the pin number - - second cell is used to specify flags. Flags are currently unused. -- gpio-controller : Marks the device node as a GPIO controller. -- reg : For an address on its bus. I2C uses this a the I2C address of the chip. - SPI uses this to specify the chipselect line which the chip is - connected to. The driver and the SPI variant of the chip support - multiple chips on the same chipselect. Have a look at - microchip,spi-present-mask below. - -Required device specific properties (only for SPI chips): -- mcp,spi-present-mask (DEPRECATED) -- microchip,spi-present-mask : This is a present flag, that makes only sense for SPI - chips - as the name suggests. 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. - NOTE: Do not use the old mcp prefix any more. It is deprecated and will be - removed. -- spi-max-frequency = The maximum frequency this chip is able to handle - -Optional properties: -- #interrupt-cells : Should be two. - - first cell is the pin number - - second cell is used to specify flags. -- interrupt-controller: Marks the device node as a interrupt controller. - -Optional device specific properties: -- microchip,irq-mirror: 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. - On devices with only one interrupt output this property is useless. -- microchip,irq-active-high: Sets the INTPOL flag in the IOCON register. This - configures the IRQ output polarity as active high. - -Example I2C (with interrupt): -gpiom1: gpio@20 { - compatible = "microchip,mcp23017"; - gpio-controller; - #gpio-cells = <2>; - reg = <0x20>; - - interrupt-parent = <&gpio1>; - interrupts = <17 IRQ_TYPE_LEVEL_LOW>; - interrupt-controller; - #interrupt-cells=<2>; - microchip,irq-mirror; -}; - -Example SPI: -gpiom1: gpio@0 { - compatible = "microchip,mcp23s17"; - gpio-controller; - #gpio-cells = <2>; - spi-present-mask = <0x01>; - reg = <0>; - spi-max-frequency = <1000000>; -}; |