linux-kernel - Re: [PATCH net-next v2 2/3] dt-bindings: net: add T-HEAD dwmac support

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Message-ID: <qc2nyqmuouig6qww2q7orlwzvcprjyruyeuyr5dqdpxysajjpv@6fzsgjgokry7>
Date:   Mon, 28 Aug 2023 16:13:00 +0300
From:   Serge Semin <fancer.lancer@...il.com>
To:     Jisheng Zhang <jszhang@...nel.org>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>, Maxime@....codeaurora.org,
        Coquelin@....codeaurora.org,
        Simon Horman <simon.horman@...igine.com>,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org,
        linux-riscv@...ts.infradead.org
Subject: Re: [PATCH net-next v2 2/3] dt-bindings: net: add T-HEAD dwmac
 support

On Sun, Aug 27, 2023 at 05:17:09PM +0800, Jisheng Zhang wrote:
> Add documentation to describe T-HEAD dwmac.
> 
> Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
> ---
>  .../devicetree/bindings/net/snps,dwmac.yaml   |  1 +
>  .../devicetree/bindings/net/thead,dwmac.yaml  | 77 +++++++++++++++++++
>  2 files changed, 78 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/net/thead,dwmac.yaml
> 
> diff --git a/Documentation/devicetree/bindings/net/snps,dwmac.yaml b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> index b196c5de2061..73821f86a609 100644
> --- a/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> +++ b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> @@ -96,6 +96,7 @@ properties:
>          - snps,dwxgmac
>          - snps,dwxgmac-2.10
>          - starfive,jh7110-dwmac
> +        - thead,th1520-dwmac
>  
>    reg:
>      minItems: 1
> diff --git a/Documentation/devicetree/bindings/net/thead,dwmac.yaml b/Documentation/devicetree/bindings/net/thead,dwmac.yaml
> new file mode 100644
> index 000000000000..bf8ec8ca2753
> --- /dev/null

> +++ b/Documentation/devicetree/bindings/net/thead,dwmac.yaml

see further regarding using dwmac in the names here.

> @@ -0,0 +1,77 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/net/thead,dwmac.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +

> +title: T-HEAD DWMAC Ethernet controller

Additionally would be nice to have a brief controller "description:"
having the next info: the SoCs the controllers can be found on, the DW
(G)MAC IP-core version the ethernet controller is based on and some
data about the synthesize parameters: SMA (MDIO-bus), Tx/Rx COE, DMA
FIFOs size, perfect and hash MAC-filters size, L3L4 frame filters
availability, VLAN hash filter, SA/VLAN-tag insertion, ARP offload
engine, PHY interfaces (MII, RMII, RGMII, etc), EEE support, IEEE
1588(-2008) Timestamping support, PMT and Wake-up frame support, MAC
Management counters (MMC). In addition to that for DW QoS
ETH/XGMAC/XLGMAC the next info would be useful: number of MTL Queues
and DMA channels, MTL queues capabilities (QoS-related), TSO
availability, SPO availability.

Note DMA FIFO sizes can be also constrained in the properties
"rx-fifo-depth" and "tx-fifo-depth"; perfect and hash MAC-filter sizes -
in "snps,perfect-filter-entries" and "snps,multicast-filter-bins".

> +
> +maintainers:
> +  - Jisheng Zhang <jszhang@...nel.org>
> +
> +select:
> +  properties:
> +    compatible:
> +      contains:
> +        enum:

> +          - thead,th1520-dwmac

Referring to the DW IP-core in the compatible string isn't very
much useful especially seeing you have a generic fallback compatible.
Name like "thead,th1520-gmac" looks more informative indicating its
speed capability.

> +  required:
> +    - compatible
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:

> +          - thead,th1520-dwmac

ditto.

-Serge(y)

> +      - const: snps,dwmac-3.70a
> +
> +  reg:
> +    maxItems: 1
> +
> +  thead,gmacapb:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description:
> +      The phandle to the syscon node that control ethernet
> +      interface and timing delay.
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +  - interrupts
> +  - interrupt-names
> +  - phy-mode
> +  - thead,gmacapb
> +
> +allOf:
> +  - $ref: snps,dwmac.yaml#
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    gmac0: ethernet@...70000 {
> +        compatible = "thead,th1520-dwmac", "snps,dwmac-3.70a";
> +        reg = <0xe7070000 0x2000>;
> +        clocks = <&clk 1>, <&clk 2>;
> +        clock-names = "stmmaceth", "pclk";
> +        interrupts = <66>;
> +        interrupt-names = "macirq";
> +        phy-mode = "rgmii-id";
> +        snps,fixed-burst;
> +        snps,axi-config = <&stmmac_axi_setup>;
> +        snps,pbl = <32>;
> +        thead,gmacapb = <&gmacapb_syscon>;
> +        phy-handle = <&phy0>;
> +
> +        mdio {
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +            compatible = "snps,dwmac-mdio";
> +
> +            phy0: ethernet-phy@0 {
> +                reg = <0>;
> +            };
> +        };
> +    };
> -- 
> 2.40.1
> 
>