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Message-ID: <20241022060157.36372-1-himanshu.bhavani@siliconsignals.io>
Date: Tue, 22 Oct 2024 11:31:27 +0530
From: Himanshu Bhavani <himanshu.bhavani@...iconsignals.io>
To: linus.walleij@...aro.org,
robh@...nel.org,
krzk+dt@...nel.org,
conor+dt@...nel.org
Cc: Himanshu Bhavani <himanshu.bhavani@...iconsignals.io>,
linux-gpio@...r.kernel.org,
devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH] dt-bindings: pinctrl: convert pinctrl-mcp23s08.txt to yaml format
Convert the text bindings of pinctrl-mcp23s08 to YAML so it could be used to
validate the DTS.
Signed-off-by: Himanshu Bhavani <himanshu.bhavani@...iconsignals.io>
---
.../bindings/pinctrl/pinctrl-mcp23s08.txt | 148 -----------------
.../bindings/pinctrl/pinctrl-mcp23s08.yaml | 153 ++++++++++++++++++
2 files changed, 153 insertions(+), 148 deletions(-)
delete mode 100644 Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.txt
create mode 100644 Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.yaml
diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.txt b/Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.txt
deleted file mode 100644
index 2fa5edac7a35..000000000000
--- a/Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.txt
+++ /dev/null
@@ -1,148 +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
- - "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.
- - first cell is the pin number
- - second cell is used to specify flags as described in
- 'Documentation/devicetree/bindings/gpio/gpio.txt'. Allowed values defined by
- 'include/dt-bindings/gpio/gpio.h' (e.g. GPIO_ACTIVE_LOW).
-- 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.
-- drive-open-drain: Sets the ODR flag in the IOCON register. This configures
- the IRQ output as open drain active low.
-- reset-gpios: Corresponds to the active-low RESET# pin for the chip
-
-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>;
- microchip,spi-present-mask = <0x01>;
- 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 <devicetree/bindings/pinctrl/pinctrl-bindings.txt>
-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-bindings.txt>.
-- pinctrl[0...n]: Properties to contain the phandle for pinctrl states per
- <pinctrl-bindings.txt>.
-
-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
-<pinctrl-bindings.txt>. 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>;
- reset-gpios = <&gpio6 15 GPIO_ACTIVE_LOW>;
-
- gpio21pullups: pinmux {
- pins = "gpio0", "gpio1", "gpio2", "gpio3",
- "gpio4", "gpio5", "gpio6", "gpio7",
- "gpio8", "gpio9", "gpio10", "gpio11",
- "gpio12", "gpio13", "gpio14", "gpio15";
- bias-pull-up;
- };
-};
diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.yaml b/Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.yaml
new file mode 100644
index 000000000000..3904b8adba44
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.yaml
@@ -0,0 +1,153 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# Copyright 2024 Silicon Signals Pvt. Ltd.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pinctrl/pinctrl-mcp23s08.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Microchip I/O expander with serial interface (I2C/SPI)
+
+maintainers:
+ - Himanshu Bhavani <himanshu.bhavani@...iconsignals.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.
+
+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
+
+ spi-max-frequency:
+ description: Maximum frequency for SPI devices.
+
+ microchip,spi-present-mask:
+ description: |
+ SPI present mask. Specifies which chips are present on the shared SPI
+ chipselect. Each bit in the mask represents one SPI address.
+ $ref: /schemas/types.yaml#/definitions/uint8
+
+ microchip,irq-mirror:
+ type: boolean
+ description: |
+ Sets the mirror flag in the IOCON register. Devices with two interrupt
+ outputs (these are the devices ending with 17 and those that have 16 IOs)
+ have two IO banks IO 0-7 form bank 1 and IO 8-15 are bank 2. These chips
+ have two different interrupt outputs One for bank 1 and another for
+ bank 2. If irq-mirror is set, both interrupts are generated regardless of
+ the bank that an input change occurred on. If it is not set,the interrupt
+ are only generated for the bank they belong to.
+
+ microchip,irq-active-high:
+ type: boolean
+ description: |
+ Sets the INTPOL flag in the IOCON register.This configures the IRQ output
+ polarity as active high.
+
+ drive-open-drain:
+ type: boolean
+ description: |
+ Sets the ODR flag in the IOCON register. This configures the IRQ output as
+ open drain active low.
+
+ pinmux:
+ type: object
+ properties:
+ pins:
+ description: |
+ The list of GPIO pins controlled by this node. Each pin name corresponds
+ to a physical pin on the GPIO expander.
+ items:
+ pattern: "^gpio([0-9]|[1][0-5])$"
+ maxItems: 16
+
+ bias-pull-up:
+ type: boolean
+ description: Configures pull-up resistors for the GPIO pins.
+
+ required:
+ - pins
+ - bias-pull-up
+
+ additionalProperties: false
+
+required:
+ - compatible
+ - reg
+ - gpio-controller
+ - '#gpio-cells'
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/interrupt-controller/irq.h>
+ #include <dt-bindings/gpio/gpio.h>
+
+ i2c {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ mcp23017: gpio@20 {
+ compatible = "microchip,mcp23017";
+ reg = <0x20>;
+ gpio-controller;
+ #gpio-cells = <2>;
+
+ interrupt-parent = <&gpio1>;
+ interrupts = <17 IRQ_TYPE_LEVEL_LOW>; // Check this line
+ interrupt-controller;
+ #interrupt-cells = <2>;
+
+ microchip,irq-mirror;
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_i2c_gpio0>, <&gpio21pullups>;
+ reset-gpios = <&gpio6 15 GPIO_ACTIVE_LOW>;
+
+ gpio21pullups: 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>;
+
+ mcp23s17: gpio@0 {
+ compatible = "microchip,mcp23s17";
+ reg = <0>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ spi-max-frequency = <1000000>;
+ microchip,spi-present-mask = /bits/ 8 <0x01>;
+ };
+ };
--
2.43.0
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