Re: [PATCH 21/28] dt-bindings: gpio: Convert mrvl-gpio to json-schema

[Rob Herring <robh@xxxxxxxxxx>]

On Tue, Mar 17, 2020 at 10:39:15AM +0100, Lubomir Rintel wrote:
> This converts the mrvl-gpio binding to DT schema format using json-schema.
> 
> Various fixes were done during the conversion, such as adding more
> properties that are in fact mandatory or extending the examples to
> include child nodes with extra GPIO blocks.

Ugg, not how I would have done this. Differences in register layout 
should be implied by the compatible strings. But I guess we have to live 
with it now.

> The compatible strings are a mess. It is not clear why so many of them
> are needed; the driver doesn't really seem to differentiate between the
> models. Some of them, like marvell,pxa93x-gpio and marvell,pxa1928-gpio
> are not used at all, so it's not known how many interrupts they utilize.
> On the other hand, mrvl,pxa-gpio has been seen in the tree, but it
> doesn't end up in any actual DTB file.

I added pxa1928 and then work on it ended. I think it is safe to remove, 
but I dug up dts file and it is 1 irq.

> In any case -- the schema merely copies whatever was in the original
> binding document, so it's hopefully no more wrong that the original.
> 
> Signed-off-by: Lubomir Rintel <lkundrak@xxxxx>
> ---
>  .../devicetree/bindings/gpio/mrvl-gpio.txt    |  48 -----
>  .../devicetree/bindings/gpio/mrvl-gpio.yaml   | 173 ++++++++++++++++++
>  2 files changed, 173 insertions(+), 48 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/gpio/mrvl-gpio.txt
>  create mode 100644 Documentation/devicetree/bindings/gpio/mrvl-gpio.yaml
> 
> diff --git a/Documentation/devicetree/bindings/gpio/mrvl-gpio.txt b/Documentation/devicetree/bindings/gpio/mrvl-gpio.txt
> deleted file mode 100644
> index 30fd2201b3d4c..0000000000000
> --- a/Documentation/devicetree/bindings/gpio/mrvl-gpio.txt
> +++ /dev/null
> @@ -1,48 +0,0 @@
> -* Marvell PXA GPIO controller
> -
> -Required properties:
> -- compatible : Should be "intel,pxa25x-gpio", "intel,pxa26x-gpio",
> -		"intel,pxa27x-gpio", "intel,pxa3xx-gpio",
> -		"marvell,pxa93x-gpio", "marvell,mmp-gpio",
> -		"marvell,mmp2-gpio" or marvell,pxa1928-gpio.
> -- reg : Address and length of the register set for the device
> -- interrupts : Should be the port interrupt shared by all gpio pins.
> -  There're three gpio interrupts in arch-pxa, and they're gpio0,
> -  gpio1 and gpio_mux. There're only one gpio interrupt in arch-mmp,
> -  gpio_mux.
> -- interrupt-names : Should be the names of irq resources. Each interrupt
> -  uses its own interrupt name, so there should be as many interrupt names
> -  as referenced interrupts.
> -- interrupt-controller : Identifies the node as an interrupt controller.
> -- #interrupt-cells: Specifies the number of cells needed to encode an
> -  interrupt source.
> -- gpio-controller : Marks the device node as a gpio controller.
> -- #gpio-cells : Should be two.  The first cell is the pin number and
> -  the second cell is used to specify flags. See gpio.txt for possible
> -  values.
> -
> -Example for a MMP platform:
> -
> -	gpio: gpio@d4019000 {
> -		compatible = "marvell,mmp-gpio";
> -		reg = <0xd4019000 0x1000>;
> -		interrupts = <49>;
> -		interrupt-names = "gpio_mux";
> -		gpio-controller;
> -		#gpio-cells = <2>;
> -		interrupt-controller;
> -		#interrupt-cells = <1>;
> -      };
> -
> -Example for a PXA3xx platform:
> -
> -	gpio: gpio@40e00000 {
> -		compatible = "intel,pxa3xx-gpio";
> -		reg = <0x40e00000 0x10000>;
> -		interrupt-names = "gpio0", "gpio1", "gpio_mux";
> -		interrupts = <8 9 10>;
> -		gpio-controller;
> -		#gpio-cells = <0x2>;
> -		interrupt-controller;
> -		#interrupt-cells = <0x2>;
> -	};
> diff --git a/Documentation/devicetree/bindings/gpio/mrvl-gpio.yaml b/Documentation/devicetree/bindings/gpio/mrvl-gpio.yaml
> new file mode 100644
> index 0000000000000..5c713bf59b06d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpio/mrvl-gpio.yaml
> @@ -0,0 +1,173 @@
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/gpio/mrvl-gpio.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Marvell PXA GPIO controller
> +
> +maintainers:
> +  - devicetree@xxxxxxxxxxxxxxx

Needs to be a real person that cares about this h/w.

> +
> +allOf:
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - intel,pxa25x-gpio
> +              - intel,pxa26x-gpio
> +              - intel,pxa27x-gpio
> +              - intel,pxa3xx-gpio
> +    then:
> +      properties:
> +        interrupts:
> +          minItems: 3
> +          maxItems: 3
> +        interrupt-names:
> +          items:
> +            - const: gpio0
> +            - const: gpio1
> +            - const: gpio_mux
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - marvell,mmp-gpio
> +              - marvell,mmp2-gpio

I'd make this an else clause.

> +    then:
> +      properties:
> +        interrupts:
> +          maxItems: 1
> +        interrupt-names:
> +          items:
> +            - const: gpio_mux
> +
> +properties:
> +  $nodename:
> +    pattern: '^gpio@[0-9a-f]+$'
> +
> +  compatible:
> +    enum:
> +      - intel,pxa25x-gpio
> +      - intel,pxa26x-gpio
> +      - intel,pxa27x-gpio
> +      - intel,pxa3xx-gpio
> +      - marvell,mmp-gpio
> +      - marvell,mmp2-gpio
> +      - marvell,pxa93x-gpio
> +      - marvell,pxa1928-gpio
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 1
> +
> +  resets:
> +    maxItems: 1
> +
> +  ranges: true
> +
> +  '#address-cells':
> +    const: 1
> +
> +  '#size-cells':
> +    const: 1
> +
> +  gpio-controller: true
> +
> +  '#gpio-cells':
> +    const: 2
> +
> +  gpio-ranges:
> +    maxItems: 1

My pxa1928 dts has this in the child nodes. Sure this is right?

> +
> +  interrupts: true
> +
> +  interrupt-names: true
> +
> +  interrupt-controller: true
> +
> +  '#interrupt-cells':
> +    const: 2
> +
> +patternProperties:
> +  '^gpio@[0-9a-f]*$':
> +    type: object
> +    properties:
> +      reg:
> +        maxItems: 1
> +
> +    required:
> +      - reg
> +
> +    additionalProperties: false
> +
> +required:
> +  - compatible
> +  - '#address-cells'
> +  - '#size-cells'
> +  - reg
> +  - gpio-controller
> +  - '#gpio-cells'
> +  - interrupts
> +  - interrupt-names
> +  - interrupt-controller
> +  - '#interrupt-cells'
> +  - ranges
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/pxa-clock.h>
> +    gpio@40e00000 {
> +        compatible = "intel,pxa3xx-gpio";
> +        #address-cells = <1>;
> +        #size-cells = <1>;
> +        reg = <0x40e00000 0x10000>;
> +        gpio-controller;
> +        #gpio-cells = <2>;
> +        interrupts = <8>, <9>, <10>;
> +        interrupt-names = "gpio0", "gpio1", "gpio_mux";
> +        clocks = <&clks CLK_GPIO>;
> +        interrupt-controller;
> +        #interrupt-cells = <2>;
> +        ranges;

No child, so there should be no ranges here.

> +    };
> +  - |
> +    #include <dt-bindings/clock/marvell,pxa910.h>
> +    gpio@d4019000 {
> +        compatible = "marvell,mmp-gpio";
> +        #address-cells = <1>;
> +        #size-cells = <1>;
> +        reg = <0xd4019000 0x1000>;
> +        gpio-controller;
> +        #gpio-cells = <2>;
> +        interrupts = <49>;
> +        interrupt-names = "gpio_mux";
> +        clocks = <&soc_clocks PXA910_CLK_GPIO>;
> +        resets = <&soc_clocks PXA910_CLK_GPIO>;
> +        interrupt-controller;
> +        #interrupt-cells = <2>;
> +        ranges;
> +
> +        gpio@d4019000 {
> +            reg = <0xd4019000 0x4>;
> +        };
> +
> +        gpio@d4019004 {
> +            reg = <0xd4019004 0x4>;
> +        };
> +
> +        gpio@d4019008 {
> +            reg = <0xd4019008 0x4>;
> +        };
> +
> +        gpio@d4019100 {
> +            reg = <0xd4019100 0x4>;
> +        };
> +     };
> +
> +...
> -- 
> 2.25.1
>