linux-kernel - Re: [PATCH v2 1/8] dt-bindings: pinctrl: mvebu: Document bindings for AC5

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Message-ID: <7e73bba0-8b54-772c-2e94-8fca4e4e3294@alliedtelesis.co.nz>
Date:   Tue, 15 Mar 2022 21:12:45 +0000
From:   Chris Packham <Chris.Packham@...iedtelesis.co.nz>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "linus.walleij@...aro.org" <linus.walleij@...aro.org>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "gregory.clement@...tlin.com" <gregory.clement@...tlin.com>,
        "sebastian.hesselbarth@...il.com" <sebastian.hesselbarth@...il.com>
CC:     "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 1/8] dt-bindings: pinctrl: mvebu: Document bindings for
 AC5

(trimmed cc list to the arm, pinctrl and dt people)

On 15/03/22 23:46, Krzysztof Kozlowski wrote:
> On 14/03/2022 22:31, Chris Packham wrote:
>> Add JSON schema for marvell,ac5-pinctrl present on the Marvell 98DX2530
>> SoC.
>>
>> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
>> ---
>>
>> Notes:
>>      Changes in v2:
>>      - Remove syscon and simple-mfd compatibles
>>
>>   .../bindings/pinctrl/marvell,ac5-pinctrl.yaml | 70 +++++++++++++++++++
>>   1 file changed, 70 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/pinctrl/marvell,ac5-pinctrl.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/pinctrl/marvell,ac5-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/marvell,ac5-pinctrl.yaml
>> new file mode 100644
>> index 000000000000..65af1d5f5fe0
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/pinctrl/marvell,ac5-pinctrl.yaml
>> @@ -0,0 +1,70 @@
>> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
>> +%YAML 1.2
>> +---
>> +$id: http://scanmail.trustwave.com/?c=20988&d=vu6w4lGvpbdx5x7Y5wSGMQ_aPa00Bnj19ce8eGP0QA&u=http%3a%2f%2fdevicetree%2eorg%2fschemas%2fpinctrl%2fmarvell%2cac5-pinctrl%2eyaml%23
>> +$schema: http://scanmail.trustwave.com/?c=20988&d=vu6w4lGvpbdx5x7Y5wSGMQ_aPa00Bnj19cPrfjTyTg&u=http%3a%2f%2fdevicetree%2eorg%2fmeta-schemas%2fcore%2eyaml%23
>> +
>> +title: Marvell AC5 pin controller
>> +
>> +maintainers:
>> +  - Chris Packham <chris.packham@...iedtelesis.co.nz>
>> +
>> +description:
>> +  Bindings for Marvell's AC5 memory-mapped pin controller.
>> +
>> +properties:
>> +  compatible:
>> +    const: marvell,ac5-pinctrl
>> +
>> +patternProperties:
>> +  '-pins$':
>> +    type: object
>> +    $ref: pinmux-node.yaml#
>> +
>> +    properties:
>> +      marvell,function:
>> +        $ref: "/schemas/types.yaml#/definitions/string"
>> +        description:
>> +          Indicates the function to select.
>> +        enum: [ gpio, i2c0, i2c1, nand, sdio, spi0, spi1, uart0, uart1, uart2, uart3 ]
>> +
>> +      marvell,pins:
>> +        $ref: /schemas/types.yaml#/definitions/string-array
>> +        description:
>> +          Array of MPP pins to be used for the given function.
>> +        minItems: 1
>> +        items:
>> +          enum: [ mpp0, mpp1, mpp2, mpp3, mpp4, mpp5, mpp6, mpp7, mpp8, mpp9,
>> +                  mpp10, mpp11, mpp12, mpp13, mpp14, mpp15, mpp16, mpp17, mpp18, mpp19,
>> +                  mpp20, mpp21, mpp22, mpp23, mpp24, mpp25, mpp26, mpp27, mpp28, mpp29,
>> +                  mpp30, mpp31, mpp32, mpp33, mpp34, mpp35, mpp36, mpp37, mpp38, mpp39,
>> +                  mpp40, mpp41, mpp42, mpp43, mpp44, mpp45 ]
>> +
>> +allOf:
>> +  - $ref: "pinctrl.yaml#"
>> +
>> +required:
>> +  - compatible
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    system-controller@...20100 {
>> +      compatible = "syscon", "simple-mfd";
>> +      reg = <0x80020000 0x20>;
> This is unusual. Usually the pinctrl should be a device @80020100, not
> child of syscon node. Why do you need it? In v1 you mentioned that
> vendor sources do like this, but it's not correct to copy wrong DTS. :)

The vendor dts has this

         pinctrl0: pinctrl@...20100 {
             compatible = "marvell,ac5-pinctrl",
                      "syscon", "simple-mfd";
             reg = <0 0x80020100 0 0x20>;
             i2c_mpps: i2c-mpps {
                 marvell,pins = "mpp26", "mpp27";
                 marvell,function = "i2c0-opt";
             };
      };

Rob pointed out that "syscon", "simple-mfd" don't belong. I went looking 
and found marvell,armada-7k-pinctrl which has the pinctrl as a child of 
a syscon node and what you see in v2 is the result.

I probably went a bit too far off the deep end and should have just 
dropped the "syscon", "simple-mfd" compatibles. I even wrote that 
version but decided to add some gold plating before I submitted it.

>
>
> Best regards,
> Krzysztof