Re: [PATCH v3 2/4] dt-bindings: net: Add Loongson-1 Ethernet Controller

[Keguang Zhang]

On Sun, Aug 27, 2023 at 5:04 AM Serge Semin <fancer.lancer@xxxxxxxxx> wrote:
>
> On Thu, Aug 24, 2023 at 08:50:10PM +0800, Keguang Zhang wrote:
> > Add devicetree binding document for Loongson-1 Ethernet controller.
> >
> > Signed-off-by: Keguang Zhang <keguang.zhang@xxxxxxxxx>
> > Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
> > ---
> > V2 -> V3: Split the DT-schema file into loongson,ls1b-gmac.yaml
> >           and loongson,ls1c-emac.yaml (suggested by Serge Semin)
> >           Change the compatibles to loongson,ls1b-gmac and loongson,ls1c-emac
> >           Rename loongson,dwmac-syscon to loongson,ls1-syscon
> >           Amend the title
> >           Add description
> >           Add Reviewed-by tag from Krzysztof Kozlowski(Sorry! I'm not sure)
> > V1 -> V2: Fix "clock-names" and "interrupt-names" property
> >           Rename the syscon property to "loongson,dwmac-syscon"
> >           Drop "phy-handle" and "phy-mode" requirement
> >           Revert adding loongson,ls1b-dwmac/loongson,ls1c-dwmac
> >           to snps,dwmac.yaml
> >
> >  .../bindings/net/loongson,ls1b-gmac.yaml      | 115 ++++++++++++++++++
> >  .../bindings/net/loongson,ls1c-emac.yaml      | 114 +++++++++++++++++
> >  2 files changed, 229 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/net/loongson,ls1b-gmac.yaml
> >  create mode 100644 Documentation/devicetree/bindings/net/loongson,ls1c-emac.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/net/loongson,ls1b-gmac.yaml b/Documentation/devicetree/bindings/net/loongson,ls1b-gmac.yaml
> > new file mode 100644
> > index 000000000000..f661d5b86649
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/net/loongson,ls1b-gmac.yaml
> > @@ -0,0 +1,115 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/net/loongson,ls1b-gmac.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Loongson-1B Gigabit Ethernet MAC Controller
> > +
> > +maintainers:
> > +  - Keguang Zhang <keguang.zhang@xxxxxxxxx>
> > +
>
> > +description:
>
> Use "|" to keep the text formatting.
>   description: |
>
> > +  Loongson-1B Gigabit Ethernet MAC Controller is based on
> > +  Synopsys DesignWare MAC (version 3.50a).
> > +
>
> > +  Main features
> > +  - Dual 10/100/1000Mbps GMAC controllers
> > +  - Full-duplex operation (IEEE 802.3x flow control automatic transmission)
> > +  - Half-duplex operation (CSMA/CD Protocol and back-pressure support)
> > +  - RX Checksum Offload
> > +  - TX Checksum insertion
> > +  - MII interface
> > +  - RGMII interface
>
> If only all the DW *MAC-based devices have such info in the
> bindings the life would have been much easier...
>
> > +
> > +select:
> > +  properties:
> > +    compatible:
> > +      contains:
> > +        enum:
> > +          - loongson,ls1b-gmac
> > +  required:
> > +    - compatible
> > +
> > +properties:
> > +  compatible:
> > +    items:
> > +      - enum:
> > +          - loongson,ls1b-gmac
> > +      - const: snps,dwmac-3.50a
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  clocks:
> > +    maxItems: 1
> > +
>
> > +  clock-names:
> > +    items:
> > +      - const: stmmaceth
>
> since there is a single clock then just:
>   clock-names:
>     const: stmmaceth
>
> > +
> > +  interrupts:
> > +    maxItems: 1
> > +
>
> > +  interrupt-names:
> > +    items:
> > +      - const: macirq
>
> ditto. just
>   interrupt-names:
>     const: macirq
>
> > +
> > +  loongson,ls1-syscon:
> > +    $ref: /schemas/types.yaml#/definitions/phandle
> > +    description:
> > +      Phandle to the syscon containing some extra configurations
> > +      including PHY interface mode.
> > +
>
> > +  phy-mode:
> > +    items:
> > +      - enum:
> > +          - mii
> > +          - rgmii-id
>
> it's a single string then just:
>   phy-mode:
>     enum: ...
>
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - clocks
> > +  - clock-names
> > +  - interrupts
> > +  - interrupt-names
> > +  - loongson,ls1-syscon
> > +
> > +allOf:
> > +  - $ref: snps,dwmac.yaml#
> > +
> > +unevaluatedProperties: false
> > +
> > +examples:
> > +  - |
> > +    #include <dt-bindings/clock/loongson,ls1x-clk.h>
> > +    #include <dt-bindings/interrupt-controller/irq.h>
> > +
> > +    gmac0: ethernet@1fe10000 {
> > +        compatible = "loongson,ls1b-gmac", "snps,dwmac-3.50a";
> > +        reg = <0x1fe10000 0x10000>;
> > +
> > +        clocks = <&clkc LS1X_CLKID_AHB>;
> > +        clock-names = "stmmaceth";
> > +
> > +        interrupt-parent = <&intc1>;
> > +        interrupts = <2 IRQ_TYPE_LEVEL_HIGH>;
> > +        interrupt-names = "macirq";
> > +
> > +        loongson,ls1-syscon = <&syscon>;
> > +
> > +        phy-handle = <&phy0>;
> > +        phy-mode = "mii";
> > +        snps,pbl = <1>;
> > +
> > +        mdio {
> > +            #address-cells = <1>;
> > +            #size-cells = <0>;
> > +            compatible = "snps,dwmac-mdio";
> > +
> > +            phy0: ethernet-phy@0 {
> > +                reg = <0x0>;
> > +            };
> > +        };
> > +    };
> > diff --git a/Documentation/devicetree/bindings/net/loongson,ls1c-emac.yaml b/Documentation/devicetree/bindings/net/loongson,ls1c-emac.yaml
> > new file mode 100644
> > index 000000000000..1ffad41941bf
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/net/loongson,ls1c-emac.yaml
> > @@ -0,0 +1,114 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/net/loongson,ls1c-emac.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Loongson-1C Ethernet MAC Controller
> > +
> > +maintainers:
> > +  - Keguang Zhang <keguang.zhang@xxxxxxxxx>
> > +
>
> > +description:
>
> the same comment about the "|" modifier.
>
> > +  Loongson-1C Ethernet MAC Controller is based on
> > +  Synopsys DesignWare MAC (version 3.50a).
> > +
>
> > +  Main features
> > +  - 10/100Mbps
> > +  - Full-duplex operation (IEEE 802.3x flow control automatic transmission)
> > +  - Half-duplex operation (CSMA/CD Protocol and back-pressure support)
> > +  - IEEE 802.1Q VLAN tag detection for reception frames
> > +  - MII interface
> > +  - RMII interface
>
> Based on the plat_stmmacenet_data data defined for the LS1C MAC it
> also support support Tx COE. Isn't it? What about Rx COE?
>
According to the value read from HW Feature Register(offset 0x1058),
both TXCOESEL an
RXTYP1COE/RXTYP2COE are zero.
Therefore, neither TX COE nor RX COE is supported by LS1C MAC.
Current plat_stmmacenet_data is Inaccurate.

> > +
> > +select:
> > +  properties:
> > +    compatible:
> > +      contains:
> > +        enum:
> > +          - loongson,ls1c-emac
> > +  required:
> > +    - compatible
> > +
> > +properties:
> > +  compatible:
> > +    items:
> > +      - enum:
> > +          - loongson,ls1c-emac
> > +      - const: snps,dwmac-3.50a
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  clocks:
> > +    maxItems: 1
> > +
>
> > +  clock-names:
> > +    items:
> > +      - const: stmmaceth
>
>   clock-names:
>     const: stmmaceth
> ?
>
> > +
> > +  interrupts:
> > +    maxItems: 1
> > +
>
> > +  interrupt-names:
> > +    items:
> > +      - const: macirq
>
>   interrupt-names:
>     const: macirq
> ?
>
> > +
> > +  loongson,ls1-syscon:
> > +    $ref: /schemas/types.yaml#/definitions/phandle
> > +    description:
> > +      Phandle to the syscon containing some extra configurations
> > +      including PHY interface mode.
> > +
>
> > +  phy-mode:
> > +    items:
> > +      - enum:
> > +          - mii
> > +          - rmii
>
>   phy-mode:
>     enum: ...
> ?
>
> -Serge(y)
>
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - clocks
> > +  - clock-names
> > +  - interrupts
> > +  - interrupt-names
> > +  - loongson,ls1-syscon
> > +
> > +allOf:
> > +  - $ref: snps,dwmac.yaml#
> > +
> > +unevaluatedProperties: false
> > +
> > +examples:
> > +  - |
> > +    #include <dt-bindings/clock/loongson,ls1x-clk.h>
> > +    #include <dt-bindings/interrupt-controller/irq.h>
> > +
> > +    emac: ethernet@1fe10000 {
> > +        compatible = "loongson,ls1c-emac", "snps,dwmac-3.50a";
> > +        reg = <0x1fe10000 0x10000>;
> > +
> > +        clocks = <&clkc LS1X_CLKID_AHB>;
> > +        clock-names = "stmmaceth";
> > +
> > +        interrupt-parent = <&intc1>;
> > +        interrupts = <2 IRQ_TYPE_LEVEL_HIGH>;
> > +        interrupt-names = "macirq";
> > +
> > +        loongson,ls1-syscon = <&syscon>;
> > +
> > +        phy-handle = <&phy0>;
> > +        phy-mode = "mii";
> > +        snps,pbl = <1>;
> > +
> > +        mdio {
> > +            #address-cells = <1>;
> > +            #size-cells = <0>;
> > +            compatible = "snps,dwmac-mdio";
> > +
> > +            phy0: ethernet-phy@13 {
> > +                reg = <0x13>;
> > +            };
> > +        };
> > +    };
> > --
> > 2.39.2
> >
> >



--
Best regards,

Keguang Zhang