Re: [PATCH v10 03/13] dt-bindings: Convert gpio-mmio to yaml

[Rob Herring <robh@xxxxxxxxxx>]

On Mon, Mar 06, 2023 at 02:15:25PM -0500, Sean Anderson wrote:
> This is a generic binding for simple MMIO GPIO controllers. Although we
> have a single driver for these controllers, they were previously spread
> over several files. Consolidate them. The register descriptions are
> adapted from the comments in the source. There is no set order for the
> registers, so I have not specified one.
> 
> Signed-off-by: Sean Anderson <sean.anderson@xxxxxxxx>
> ---
> 
> Changes in v10:
> - New
> 
>  .../bindings/gpio/brcm,bcm6345-gpio.yaml      |  16 +--
>  .../devicetree/bindings/gpio/gpio-mmio.yaml   | 136 ++++++++++++++++++
>  .../bindings/gpio/ni,169445-nand-gpio.txt     |  38 -----
>  .../devicetree/bindings/gpio/wd,mbl-gpio.txt  |  38 -----
>  4 files changed, 137 insertions(+), 91 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/gpio/gpio-mmio.yaml
>  delete mode 100644 Documentation/devicetree/bindings/gpio/ni,169445-nand-gpio.txt
>  delete mode 100644 Documentation/devicetree/bindings/gpio/wd,mbl-gpio.txt
> 
> diff --git a/Documentation/devicetree/bindings/gpio/brcm,bcm6345-gpio.yaml b/Documentation/devicetree/bindings/gpio/brcm,bcm6345-gpio.yaml
> index 4d69f79df859..e11f4af49c52 100644
> --- a/Documentation/devicetree/bindings/gpio/brcm,bcm6345-gpio.yaml
> +++ b/Documentation/devicetree/bindings/gpio/brcm,bcm6345-gpio.yaml
> @@ -4,7 +4,7 @@
>  $id: http://devicetree.org/schemas/gpio/brcm,bcm6345-gpio.yaml#
>  $schema: http://devicetree.org/meta-schemas/core.yaml#
>  
> -title: Broadcom BCM6345 GPIO controller
> +title: Broadcom BCM63xx GPIO controller
>  
>  maintainers:
>    - Álvaro Fernández Rojas <noltari@xxxxxxxxx>
> @@ -18,8 +18,6 @@ description: |+
>  
>    BCM6338 have 8-bit data and dirout registers, where GPIO state can be read
>    and/or written, and the direction changed from input to output.
> -  BCM6345 have 16-bit data and dirout registers, where GPIO state can be read
> -  and/or written, and the direction changed from input to output.
>    BCM6318, BCM6328, BCM6358, BCM6362, BCM6368 and BCM63268 have 32-bit data
>    and dirout registers, where GPIO state can be read and/or written, and the
>    direction changed from input to output.
> @@ -29,7 +27,6 @@ properties:
>      enum:
>        - brcm,bcm6318-gpio
>        - brcm,bcm6328-gpio
> -      - brcm,bcm6345-gpio
>        - brcm,bcm6358-gpio
>        - brcm,bcm6362-gpio
>        - brcm,bcm6368-gpio
> @@ -63,17 +60,6 @@ required:
>  additionalProperties: false
>  
>  examples:
> -  - |
> -    gpio@fffe0406 {
> -      compatible = "brcm,bcm6345-gpio";
> -      reg-names = "dirout", "dat";
> -      reg = <0xfffe0406 2>, <0xfffe040a 2>;
> -      native-endian;
> -
> -      gpio-controller;
> -      #gpio-cells = <2>;
> -    };
> -
>    - |
>      gpio@0 {
>        compatible = "brcm,bcm63268-gpio";
> diff --git a/Documentation/devicetree/bindings/gpio/gpio-mmio.yaml b/Documentation/devicetree/bindings/gpio/gpio-mmio.yaml
> new file mode 100644
> index 000000000000..fd5c7055d542
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpio/gpio-mmio.yaml
> @@ -0,0 +1,136 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/gpio/gpio-mmio.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Generic MMIO GPIO
> +
> +maintainers:
> +  - Linus Walleij <linus.walleij@xxxxxxxxxx>
> +  - Bartosz Golaszewski <brgl@xxxxxxxx>
> +
> +description: |

Don't need '|' unless you want line endings preserved. Elsewhere too.

> +  Some simple GPIO controllers may consist of a single data register or a pair
> +  of set/clear-bit registers. Such controllers are common for glue logic in
> +  FPGAs or ASICs. Commonly, these controllers are accessed over memory-mapped
> +  NAND-style parallel busses.
> +
> +properties:
> +  big-endian:
> +    true

big-endian: true

> +
> +  compatible:
> +    enum:
> +      - brcm,bcm6345-gpio # Broadcom BCM6345 GPIO controller
> +      - wd,mbl-gpio # Western Digital MyBook Live memory-mapped GPIO controller
> +      - ni,169445-nand-gpio # National Instruments 169445 GPIO NAND controller
> +
> +  '#gpio-cells':
> +    const: 2
> +
> +  gpio-controller:
> +    true

ditto.

> +
> +  reg:
> +    minItems: 1
> +    description: |
> +      A list of registers in the controller. The width of each register is
> +      determined by its size. All registers must have the same width. The number
> +      of GPIOs is set by the width, with bit 0 corresponding to GPIO 0.
> +    items:
> +      - description: |
> +          Register to READ the value of the GPIO lines. If GPIO line is high,
> +          the bit will be set. If the GPIO line is low, the bit will be cleared.
> +          This register may also be used to drive GPIOs if the SET register is
> +          omitted.
> +      - description: |
> +          Register to SET the value of the GPIO lines. Setting a bit in this
> +          register will drive the GPIO line high.
> +      - description: |
> +          Register to CLEAR the value of the GPIO lines. Setting a bit in this
> +          register will drive the GPIO line low. If this register is omitted,
> +          the SET register will be used to clear the GPIO lines as well, by
> +          actively writing the line with 0.
> +      - description: |
> +          Register to set the line as OUTPUT. Setting a bit in this register
> +          will turn that line into an output line. Conversely, clearing a bit
> +          will turn that line into an input.
> +      - description: |
> +          Register to set this line as INPUT. Setting a bit in this register
> +          will turn that line into an input line. Conversely, clearing a bit
> +          will turn that line into an output.
> +
> +  reg-names:
> +    minItems: 1
> +    maxItems: 5
> +    items:
> +      enum:
> +        - dat
> +        - set
> +        - clr
> +        - dirout
> +        - dirin
> +
> +  native-endian:
> +    true
> +
> +  no-output:
> +    $ref: /schemas/types.yaml#/definitions/flag
> +    description: |
> +      If this property is present, the controller cannot drive the GPIO lines.
> +
> +required:
> +  - compatible
> +  - reg
> +  - reg-names
> +  - '#gpio-cells'
> +  - gpio-controller
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    nand-gpio-out@1f300010 {

Use generic node name:

gpio@...

> +      compatible = "ni,169445-nand-gpio";
> +      reg = <0x1f300010 0x4>;
> +      reg-names = "dat";
> +      gpio-controller;
> +      #gpio-cells = <2>;
> +    };
> +
> +    nand-gpio-in@1f300014 {
> +      compatible = "ni,169445-nand-gpio";
> +      reg = <0x1f300014 0x4>;
> +      reg-names = "dat";
> +      gpio-controller;
> +      #gpio-cells = <2>;
> +      no-output;
> +    };
> +
> +    gpio0@e0000000 {
> +      compatible = "wd,mbl-gpio";
> +      reg-names = "dat";
> +      reg = <0xe0000000 0x1>;
> +      #gpio-cells = <2>;
> +      gpio-controller;
> +    };
> +
> +    gpio1@e0100000 {
> +      compatible = "wd,mbl-gpio";
> +      reg-names = "dat";
> +      reg = <0xe0100000 0x1>;
> +      #gpio-cells = <2>;
> +      gpio-controller;
> +      no-output;
> +    };
> +
> +    gpio@fffe0406 {
> +      compatible = "brcm,bcm6345-gpio";
> +      reg-names = "dirout", "dat";
> +      reg = <0xfffe0406 2>, <0xfffe040a 2>;
> +      native-endian;
> +
> +      gpio-controller;
> +      #gpio-cells = <2>;
> +    };
> diff --git a/Documentation/devicetree/bindings/gpio/ni,169445-nand-gpio.txt b/Documentation/devicetree/bindings/gpio/ni,169445-nand-gpio.txt
> deleted file mode 100644
> index ca2f8c745a27..000000000000
> --- a/Documentation/devicetree/bindings/gpio/ni,169445-nand-gpio.txt
> +++ /dev/null
> @@ -1,38 +0,0 @@
> -Bindings for the National Instruments 169445 GPIO NAND controller
> -
> -The 169445 GPIO NAND controller has two memory mapped GPIO registers, one
> -for input (the ready signal) and one for output (control signals).  It is
> -intended to be used with the GPIO NAND driver.
> -
> -Required properties:
> -	- compatible: should be "ni,169445-nand-gpio"
> -	- reg-names: must contain
> -		"dat" - data register
> -	- reg: address + size pairs describing the GPIO register sets;
> -		order must correspond with the order of entries in reg-names
> -	- #gpio-cells: must be set to 2. The first cell is the pin number and
> -			the second cell is used to specify the gpio polarity:
> -			0 = active high
> -			1 = active low
> -	- gpio-controller: Marks the device node as a gpio controller.
> -
> -Optional properties:
> -	- no-output: disables driving output on the pins
> -
> -Examples:
> -	gpio1: nand-gpio-out@1f300010 {
> -		compatible = "ni,169445-nand-gpio";
> -		reg = <0x1f300010 0x4>;
> -		reg-names = "dat";
> -		gpio-controller;
> -		#gpio-cells = <2>;
> -	};
> -
> -	gpio2: nand-gpio-in@1f300014 {
> -		compatible = "ni,169445-nand-gpio";
> -		reg = <0x1f300014 0x4>;
> -		reg-names = "dat";
> -		gpio-controller;
> -		#gpio-cells = <2>;
> -		no-output;
> -	};
> diff --git a/Documentation/devicetree/bindings/gpio/wd,mbl-gpio.txt b/Documentation/devicetree/bindings/gpio/wd,mbl-gpio.txt
> deleted file mode 100644
> index 038c3a6a1f4d..000000000000
> --- a/Documentation/devicetree/bindings/gpio/wd,mbl-gpio.txt
> +++ /dev/null
> @@ -1,38 +0,0 @@
> -Bindings for the Western Digital's MyBook Live memory-mapped GPIO controllers.
> -
> -The Western Digital MyBook Live has two memory-mapped GPIO controllers.
> -Both GPIO controller only have a single 8-bit data register, where GPIO
> -state can be read and/or written.
> -
> -Required properties:
> -	- compatible: should be "wd,mbl-gpio"
> -	- reg-names: must contain
> -		"dat" - data register
> -	- reg: address + size pairs describing the GPIO register sets;
> -		order must correspond with the order of entries in reg-names
> -	- #gpio-cells: must be set to 2. The first cell is the pin number and
> -			the second cell is used to specify the gpio polarity:
> -			0 = active high
> -			1 = active low
> -	- gpio-controller: Marks the device node as a gpio controller.
> -
> -Optional properties:
> -	- no-output: GPIOs are read-only.
> -
> -Examples:
> -	gpio0: gpio0@e0000000 {
> -		compatible = "wd,mbl-gpio";
> -		reg-names = "dat";
> -		reg = <0xe0000000 0x1>;
> -		#gpio-cells = <2>;
> -		gpio-controller;
> -	};
> -
> -	gpio1: gpio1@e0100000 {
> -		compatible = "wd,mbl-gpio";
> -		reg-names = "dat";
> -		reg = <0xe0100000 0x1>;
> -		#gpio-cells = <2>;
> -		gpio-controller;
> -		no-output;
> -	};
> -- 
> 2.35.1.1320.gc452695387.dirty
>