From a157789b78f4e95f5d66f8b564356e396716f67e Mon Sep 17 00:00:00 2001 From: Lars Poeschel Date: Thu, 5 Oct 2017 09:50:02 +0200 Subject: dt-bindings: pinctrl: Move mcp23s08 from gpio The mcp23s08 driver was moved from gpio to pinctrl. This moves it's devicetree binding doc as well. So driver and binding doc are in sync again. Signed-off-by: Lars Poeschel Reviewed-by: Sebastian Reichel Signed-off-by: Linus Walleij --- .../bindings/pinctrl/pinctrl-mcp23s08.txt | 83 ++++++++++++++++++++++ 1 file changed, 83 insertions(+) create mode 100644 Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.txt (limited to 'Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.txt') diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.txt b/Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.txt new file mode 100644 index 000000000000..c934106b10aa --- /dev/null +++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.txt @@ -0,0 +1,83 @@ +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>; +}; -- cgit From e8527b6eb6ffdccc45b58646312cfe42365b74b0 Mon Sep 17 00:00:00 2001 From: Lars Poeschel Date: Mon, 9 Oct 2017 14:03:00 +0200 Subject: dt-bindings: pinctrl: mcp23s08 update binding doc The mcp23s08 driver moved to pinctrl recently. It accepts the bias-pull-up pinctrl property since then. This updates the binding doc to reflect that. Thanks to Sebastian Reichel for the working example. Signed-off-by: Lars Poeschel Signed-off-by: Linus Walleij --- .../bindings/pinctrl/pinctrl-mcp23s08.txt | 58 ++++++++++++++++++++++ 1 file changed, 58 insertions(+) (limited to 'Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.txt') diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.txt b/Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.txt index c934106b10aa..b7a0e868ec13 100644 --- a/Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.txt +++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.txt @@ -81,3 +81,61 @@ gpiom1: gpio@0 { reg = <0>; spi-max-frequency = <1000000>; }; + +Pull-up configuration +===================== + +If pins are used as output, they can also be configured with pull-ups. This is +done with pinctrl. + +Please refer file +for details of the common pinctrl bindings used by client devices, +including the meaning of the phrase "pin configuration node". + +Optional Pinmux properties: +-------------------------- +Following properties are required if default setting of pins are required +at boot. +- pinctrl-names: A pinctrl state named per . +- pinctrl[0...n]: Properties to contain the phandle for pinctrl states per + . + +The pin configurations are defined as child of the pinctrl states node. Each +sub-node have following properties: + +Required properties: +------------------ +- pins: List of pins. Valid values of pins properties are: + gpio0 ... gpio7 for the devices with 8 GPIO pins and + gpio0 ... gpio15 for the devices with 16 GPIO pins. + +Optional properties: +------------------- +The following optional property is defined in the pinmux DT binding document +. Absence of this property will leave the configuration +in its default state. + bias-pull-up + +Example with pinctrl to pull-up output pins: +gpio21: gpio@21 { + compatible = "microchip,mcp23017"; + gpio-controller; + #gpio-cells = <0x2>; + reg = <0x21>; + interrupt-parent = <&socgpio>; + interrupts = <0x17 0x8>; + interrupt-names = "mcp23017@21 irq"; + interrupt-controller; + #interrupt-cells = <0x2>; + microchip,irq-mirror; + pinctrl-names = "default"; + pinctrl-0 = <&i2cgpio0irq &gpio21pullups>; + + gpio21pullups: pinmux { + pins = "gpio0", "gpio1", "gpio2", "gpio3", + "gpio4", "gpio5", "gpio6", "gpio7", + "gpio8", "gpio9", "gpio10", "gpio11", + "gpio12", "gpio13", "gpio14", "gpio15"; + bias-pull-up; + }; +}; -- cgit From b889372c843b2a2c4aa776c85bca31636fd38d90 Mon Sep 17 00:00:00 2001 From: Phil Reid Date: Fri, 6 Oct 2017 13:08:06 +0800 Subject: dt-bindings: pinctrl: add mcp23018 to mcp23s08 documentation This adds the compatible string for the mcp23018, which is the i2c variant of the mcp23s18. Signed-off-by: Phil Reid Reviewed-by: Sebastian Reichel Signed-off-by: Linus Walleij --- Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.txt | 1 + 1 file changed, 1 insertion(+) (limited to 'Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.txt') diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.txt b/Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.txt index b7a0e868ec13..9c451c20dda4 100644 --- a/Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.txt +++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.txt @@ -13,6 +13,7 @@ Required properties: - "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 + - "microchip,mcp23018" for 16 GPIO I2C version NOTE: Do not use the old mcp prefix any more. It is deprecated and will be removed. - #gpio-cells : Should be two. -- cgit