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

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Date:   Wed, 27 May 2020 20:11:37 -0600
From:   Rob Herring <robh@...nel.org>
To:     Lars Povlsen <lars.povlsen@...rochip.com>
Cc:     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

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.

> +
> +    required:
> +      - compatible
> +      - reg
> +
> +patternProperties:
> +  "^syscon@[0-9a-f]+$":

This should be under a bus node.

> +    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. 

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