linux-kernel - Re: [PATCH 05/14] dt-bindings: arm: sparx5: Add documentation for Microchip Sparx5 SoC

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Date:   Tue, 2 Jun 2020 11:10:32 +0200
From:   Lars Povlsen <lars.povlsen@...rochip.com>
To:     Rob Herring <robh@...nel.org>
CC:     Lars Povlsen <lars.povlsen@...rochip.com>,
        SoC Team <soc@...nel.org>, "Arnd Bergmann" <arnd@...db.de>,
        Stephen Boyd <sboyd@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Steen Hegelund <Steen.Hegelund@...rochip.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        Olof Johansson <olof@...om.net>,
        Michael Turquette <mturquette@...libre.com>,
        <devicetree@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <linux-gpio@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
Subject: Re: [PATCH 05/14] dt-bindings: arm: sparx5: Add documentation for Microchip Sparx5 SoC


Rob Herring writes:

> On Wed, May 13, 2020 at 02:55:23PM +0200, Lars Povlsen wrote:
>> This adds the main Sparx5 SoC DT documentation file, with information
>> abut the supported board types.
>>
>> Reviewed-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
>> Signed-off-by: Lars Povlsen <lars.povlsen@...rochip.com>
>> ---
>>  .../bindings/arm/microchip,sparx5.yaml        | 87 +++++++++++++++++++
>>  1 file changed, 87 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/arm/microchip,sparx5.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/arm/microchip,sparx5.yaml b/Documentation/devicetree/bindings/arm/microchip,sparx5.yaml
>> new file mode 100644
>> index 0000000000000..83b36d1217988
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/arm/microchip,sparx5.yaml
>> @@ -0,0 +1,87 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/arm/microchip,sparx5.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Microchip Sparx5 Boards Device Tree Bindings
>> +
>> +maintainers:
>> +  - Lars Povlsen <lars.povlsen@...rochip.com>
>> +
>> +description: |+
>> +   The Microchip Sparx5 SoC is a ARMv8-based used in a family of
>> +   gigabit TSN-capable gigabit switches.
>> +
>> +   The SparX-5 Ethernet switch family provides a rich set of switching
>> +   features such as advanced TCAM-based VLAN and QoS processing
>> +   enabling delivery of differentiated services, and security through
>> +   TCAM-based frame processing using versatile content aware processor
>> +   (VCAP)
>> +
>> +properties:
>> +  $nodename:
>> +    const: '/'
>> +  compatible:
>> +    oneOf:
>> +      - description: The Sparx5 pcb125 board is a modular board,
>> +          which has both spi-nor and eMMC storage. The modular design
>> +          allows for connection of different network ports.
>> +        items:
>> +          - const: microchip,sparx5-pcb125
>> +          - const: microchip,sparx5
>> +
>> +      - description: The Sparx5 pcb134 is a pizzabox form factor
>> +          gigabit switch with 20 SFP ports. It features spi-nor and
>> +          either spi-nand or eMMC storage (mount option).
>> +        items:
>> +          - const: microchip,sparx5-pcb134
>> +          - const: microchip,sparx5
>> +
>> +      - description: The Sparx5 pcb135 is a pizzabox form factor
>> +          gigabit switch with 48+4 Cu ports. It features spi-nor and
>> +          either spi-nand or eMMC storage (mount option).
>> +        items:
>> +          - const: microchip,sparx5-pcb135
>> +          - const: microchip,sparx5
>> +
>> +  axi@...000000:
>> +    type: object
>> +    description: the root node in the Sparx5 platforms must contain
>> +      an axi bus child node. They are always at physical address
>> +      0x600000000 in all the Sparx5 variants.
>> +    properties:
>> +      compatible:
>> +        items:
>> +          - const: simple-bus
>> +      reg:
>> +        maxItems: 1
>
> simple-bus doesn't have 'reg'. If there's bus registers, then it's not
> simple.
>

Ooops, that's a leftover. I'll remove.

>> +
>> +    required:
>> +      - compatible
>> +      - reg
>> +
>> +patternProperties:
>> +  "^syscon@[0-9a-f]+$":
>
> This should be under a bus node.

I thought it was? But anyway, with the change below I guess the entire
block goes away.

>
>> +    description: All Sparx5 boards must provide a system controller,
>> +      typically under the axi bus node. It contain reset registers and
>> +      other system control.
>> +    type: object
>> +    properties:
>> +      compatible:
>> +        items:
>> +          - const: microchip,sparx5-cpu-syscon
>> +          - const: syscon
>
> This probably should be in its own document. If really this simple,
> there's already syscon.yaml you can add to.

Good suggestion, I'll add it to mfd/syscon.yaml then.

>
>> +      reg:
>> +        maxItems: 1
>> +
>> +    required:
>> +      - compatible
>> +      - reg
>> +
>> +required:
>> +  - compatible
>> +  - axi@...000000
>> +  - syscon@...000000
>> +
>> +...
>> --
>> 2.26.2

--
Lars Povlsen,
Microchip