linux-kernel - Re: [PATCH] dt-bindings: gpio: gpio-davinci: Convert to json-schema

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Date:   Fri, 21 May 2021 07:56:24 -0500
From:   Rob Herring <robh@...nel.org>
To:     Grygorii Strashko <grygorii.strashko@...com>
Cc:     Aswath Govindraju <a-govindraju@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Lokesh Vutla <lokeshvutla@...com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Keerthy <j-keerthy@...com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] dt-bindings: gpio: gpio-davinci: Convert to json-schema

On Fri, May 21, 2021 at 3:32 AM Grygorii Strashko
<grygorii.strashko@...com> wrote:
>
> Hi Rob, All
>
> On 18/05/2021 01:15, Rob Herring wrote:
> > On Tue, May 11, 2021 at 02:31:20PM +0530, Aswath Govindraju wrote:
> >> Convert gpio-davinci dt-binding documentation from txt to yaml format.
> >>
> >> Signed-off-by: Aswath Govindraju <a-govindraju@...com>
> >> ---
> >>   .../devicetree/bindings/gpio/gpio-davinci.txt | 167 ---------------
> >>   .../bindings/gpio/gpio-davinci.yaml           | 193 ++++++++++++++++++
> >>   MAINTAINERS                                   |   2 +-
> >>   3 files changed, 194 insertions(+), 168 deletions(-)
> >>   delete mode 100644 Documentation/devicetree/bindings/gpio/gpio-davinci.txt
> >>   create mode 100644 Documentation/devicetree/bindings/gpio/gpio-davinci.yaml
> >>
> >> diff --git a/Documentation/devicetree/bindings/gpio/gpio-davinci.txt b/Documentation/devicetree/bindings/gpio/gpio-davinci.txt
> >> deleted file mode 100644
> >> index 696ea46227d1..000000000000
> >> --- a/Documentation/devicetree/bindings/gpio/gpio-davinci.txt
> >> +++ /dev/null
> >> @@ -1,167 +0,0 @@
> >> -Davinci/Keystone GPIO controller bindings
> >> -
> >> -Required Properties:
> >> -- compatible: should be "ti,dm6441-gpio": for Davinci da850 SoCs
> >> -                    "ti,keystone-gpio": for Keystone 2 66AK2H/K, 66AK2L,
> >> -                                            66AK2E SoCs
> >> -                    "ti,k2g-gpio", "ti,keystone-gpio": for 66AK2G
> >> -                    "ti,am654-gpio", "ti,keystone-gpio": for TI K3 AM654
> >> -                    "ti,j721e-gpio", "ti,keystone-gpio": for J721E SoCs
> >> -                    "ti,am64-gpio", "ti,keystone-gpio": for AM64 SoCs
> >> -
>
> [...]
>
> >> -};
> >> diff --git a/Documentation/devicetree/bindings/gpio/gpio-davinci.yaml b/Documentation/devicetree/bindings/gpio/gpio-davinci.yaml
> >> new file mode 100644
> >> index 000000000000..1e16172669c7
> >> --- /dev/null
> >> +++ b/Documentation/devicetree/bindings/gpio/gpio-davinci.yaml
> >> @@ -0,0 +1,193 @@
> >> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> >> +%YAML 1.2
> >> +---
> >> +$id: http://devicetree.org/schemas/gpio/gpio-davinci.yaml#
> >> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> >> +
> >> +title: GPIO controller for Davinci and keystone devices
> >> +
> >> +maintainers:
> >> +  - Keerthy <j-keerthy@...com>
> >> +
> >> +properties:
> >> +  compatible:
> >> +    oneOf:
> >> +      - items:
> >> +          - enum:
> >> +              - ti,k2g-gpio
> >> +              - ti,am654-gpio
> >> +              - ti,j721e-gpio
> >> +              - ti,am64-gpio
> >> +          - const: ti,keystone-gpio
> >> +
> >> +      - items:
> >> +          - const: ti,dm6441-gpio
> >> +      - items:
> >> +          - const: ti,keystone-gpio
> >
> > These 2 can be expressed as an 'enum'.
> >
> >> +
> >> +  reg:
> >> +    maxItems: 1
> >> +    description:
> >> +      Physical base address of the controller and the size of memory mapped registers.
> >
> > Drop. That's every 'reg' property.
> >
> >> +
> >> +  gpio-controller: true
> >> +
> >> +  gpio-ranges: true
> >> +
> >> +  gpio-line-names:
> >> +    description: strings describing the names of each gpio line.
> >
> > Any constraints like min/max number of lines?
> >
> >> +
> >> +  "#gpio-cells":
> >> +    const: 2
> >> +    description:
> >> +      first cell is the pin number and second cell is used to specify optional parameters (unused).
> >> +
> >> +  interrupts:
> >> +    description:
> >> +      Array of GPIO interrupt number. Only banked or unbanked IRQs are supported at a time.
> >
> > Needs constraints. How many items and what are they?
> >
> >> +
> >> +  ti,ngpio:
> >> +    $ref: /schemas/types.yaml#/definitions/uint32
> >> +    description: The number of GPIO pins supported consecutively.
> >> +    minimum: 1
> >> +
> >> +  ti,davinci-gpio-unbanked:
> >> +    $ref: /schemas/types.yaml#/definitions/uint32
> >> +    description: The number of GPIOs that have an individual interrupt line to processor.
> >> +    minimum: 0
> >> +
> >> +  clocks:
> >> +    maxItems: 1
> >> +    description:
> >> +      clock-specifier to represent input to the GPIO controller.
> >
> > Drop description.
> >
> >> +
> >> +  clock-names:
> >> +    const: gpio
> >> +
> >> +  interrupt-controller: true
> >> +
> >> +  power-domains:
> >> +    maxItems: 1
> >> +    description:
> >> +      Phandle to the power domain provider node.
> >
> > Drop.
> >
> >> +
> >> +  "#interrupt-cells":
> >> +    const: 2
> >> +
> >> +patternProperties:
> >> +  "-hog$":
> >> +    type: object
> >> +    properties:
> >> +      gpios: true
> >> +      gpio-hog: true
> >> +      input: true
> >> +      output-high: true
> >> +      output-low: true
> >> +      line-name: true
> >> +
> >> +    required:
> >> +      - gpio-hog
> >> +      - gpios
>
> I see that gpio-hog.yaml dtschema has been added.
> Can it be reused here and how?

It's applied to any node containing 'gpio-hog' property, so all you need is:

required:
  - gpio-hog