linux-kernel - Re: [PATCH v7 03/22] dt-bindings: add BCM63XX GPIO binding documentation

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Message-Id: <4079680C-60B0-492D-B94A-814EED12F7DF@gmail.com>
Date:   Wed, 17 Mar 2021 11:46:46 +0100
From:   Álvaro Fernández Rojas <noltari@...il.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Lee Jones <lee.jones@...aro.org>,
        Michael Walle <michael@...le.cc>,
        Jonas Gorski <jonas.gorski@...il.com>,
        Necip Fazil Yildiran <fazilyildiran@...il.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 03/22] dt-bindings: add BCM63XX GPIO binding
 documentation

Hi Rob,

> El 16 mar 2021, a las 21:54, Rob Herring <robh@...nel.org> escribió:
> 
> On Mon, Mar 15, 2021 at 12:41:55PM +0100, Álvaro Fernández Rojas wrote:
>> Add binding documentation for the GPIO controller found in BCM6318, BCM6328,
>> BCM6358, BCM6362, BCM6368 and BCM63268 SoCs.
>> 
>> Co-developed-by: Jonas Gorski <jonas.gorski@...il.com>
>> Signed-off-by: Jonas Gorski <jonas.gorski@...il.com>
>> Signed-off-by: Álvaro Fernández Rojas <noltari@...il.com>
>> ---
>> v7: new patch, splitted from pinctrl documentation
>> 
>> .../bindings/gpio/brcm,bcm63xx-gpio.yaml      | 83 +++++++++++++++++++
>> 1 file changed, 83 insertions(+)
>> create mode 100644 Documentation/devicetree/bindings/gpio/brcm,bcm63xx-gpio.yaml
>> 
>> diff --git a/Documentation/devicetree/bindings/gpio/brcm,bcm63xx-gpio.yaml b/Documentation/devicetree/bindings/gpio/brcm,bcm63xx-gpio.yaml
>> new file mode 100644
>> index 000000000000..94a4f00ae2c7
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/gpio/brcm,bcm63xx-gpio.yaml
>> @@ -0,0 +1,83 @@
>> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/gpio/brcm,bcm63xx-gpio.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Broadcom BCM63xx GPIO controller
>> +
>> +maintainers:
>> +  - Álvaro Fernández Rojas <noltari@...il.com>
>> +  - Jonas Gorski <jonas.gorski@...il.com>
>> +
>> +description: |+
>> +  The GPIO controller node should be the child of a syscon node.
>> +
>> +  Refer to the the bindings described in
>> +  Documentation/devicetree/bindings/mfd/syscon.yaml
> 
> The above description is not too useful because it should hopefully 
> later on in the series be expressed as a schema. IOW, the syscon schema 
> should have a gpio child node with a $ref to this schema.

Is the following OK?
description:
  BCM63XX GPIO controller driver which supports the SoC system controller supplied GPIO registers.
  The BCM63XX GPIO controller node must be defined as a child node of the BCM63XX GPIO system controller node.

> 
> What would be useful is to say something about the GPIO block.

Something like…?

> 
>> +
>> +properties:
>> +  compatible:
>> +    enum:
>> +      - brcm,bcm6318-gpio
>> +      - brcm,bcm6328-gpio
>> +      - brcm,bcm6358-gpio
>> +      - brcm,bcm6362-gpio
>> +      - brcm,bcm6368-gpio
>> +      - brcm,bcm63268-gpio
>> +
>> +  data:
>> +    $ref: /schemas/types.yaml#/definitions/uint32
>> +    description: |
>> +      Offset in the register map for the data register (in bytes).
>> +
>> +  dirout:
>> +    $ref: /schemas/types.yaml#/definitions/uint32
>> +    description: |
>> +      Offset in the register map for the dirout register (in bytes).
> 
> As I said earlier, copy what brcm,bcm6345-gpio.txt did and use reg 
> instead of data and dirout properties.

Ok, I will remove dirout and data properties.

> 
> That binding says it is for bcm63xx SoCs, too. So that should be 
> resolved. It looks like it should be 1 binding IMO. The only difference 
> I see is the number of GPIO lines and register size. The fact that the 
> parent is a syscon in some cases is irrelevant.

Please be more specific.
What do you want me to do with this? How should I handle that?

> 
>> +
>> +  gpio-controller: true
>> +
>> +  "#gpio-cells":
>> +    const: 2
>> +
>> +  gpio-ranges:
>> +    maxItems: 1
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +required:
>> +  - compatible
>> +  - gpio-controller
>> +  - gpio-ranges
>> +  - '#gpio-cells'
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    gpio@0 {
>> +      compatible = "brcm,bcm6328-gpio";
>> +      reg = <0x0 0x10>;
>> +
>> +      data = <0xc>;
>> +      dirout = <0x4>;
>> +
>> +      gpio-controller;
>> +      gpio-ranges = <&pinctrl 0 0 32>;
>> +      #gpio-cells = <2>;
>> +    };
>> +
>> +  - |
>> +    gpio@0 {
>> +      compatible = "brcm,bcm63268-gpio";
>> +      reg = <0x0 0x10>;
>> +
>> +      data = <0xc>;
>> +      dirout = <0x4>;
>> +
>> +      gpio-controller;
>> +      gpio-ranges = <&pinctrl 0 0 52>;
>> +      #gpio-cells = <2>;
>> +    };
>> -- 
>> 2.20.1