Subject: Re: [PATCH v3 1/6] dt-bindings: net: dsa: convert binding for mediatek switches

From: Rob Herring <[email-masked]>
Date: Tue, 10 May 2022 13:44:43 -0500

On Sat, May 07, 2022 at 07:04:35PM +0200, Frank Wunderlich wrote:
> From: Frank Wunderlich <[email-masked]>
> 
> Convert txt binding to yaml binding for Mediatek switches.
> 
> Signed-off-by: Frank Wunderlich <[email-masked]>
> ---
> v3:
> - include standalone patch in mt7530 series
> - drop some descriptions (gpio-cells,reset-gpios,reset-names)
> - drop | from descriptions
> - move patternProperties above allOf
> 
> v2:
> - rename mediatek.yaml => mediatek,mt7530.yaml
> - drop "boolean" in description
> - drop description for interrupt-properties
> - drop #interrupt-cells as requirement
> - example: eth=>ethernet,mdio0=>mdio,comment indention
> - replace 0 by GPIO_ACTIVE_HIGH in first example
> - use port(s)-pattern from dsa.yaml
> - adress/size-cells not added to required because this
>   is defined at mdio-level inc current dts , not switch level
> ---
>  .../bindings/net/dsa/mediatek,mt7530.yaml     | 423 ++++++++++++++++++
>  .../devicetree/bindings/net/dsa/mt7530.txt    | 327 --------------
>  2 files changed, 423 insertions(+), 327 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.yaml
>  delete mode 100644 Documentation/devicetree/bindings/net/dsa/mt7530.txt
> 
> diff --git a/Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.yaml b/Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.yaml
> new file mode 100644
> index 000000000000..a7696d1b4a8c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.yaml
> @@ -0,0 +1,423 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/net/dsa/mediatek,mt7530.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Mediatek MT7530 Ethernet switch
> +
> +maintainers:
> +  - Sean Wang <[email-masked]>
> +  - Landen Chao <[email-masked]>
> +  - DENG Qingfang <[email-masked]>
> +
> +description: |
> +  Port 5 of mt7530 and mt7621 switch is muxed between:
> +  1. GMAC5: GMAC5 can interface with another external MAC or PHY.
> +  2. PHY of port 0 or port 4: PHY interfaces with an external MAC like 2nd GMAC
> +     of the SOC. Used in many setups where port 0/4 becomes the WAN port.
> +     Note: On a MT7621 SOC with integrated switch: 2nd GMAC can only connected to
> +       GMAC5 when the gpios for RGMII2 (GPIO 22-33) are not used and not
> +       connected to external component!
> +
> +  Port 5 modes/configurations:
> +  1. Port 5 is disabled and isolated: An external phy can interface to the 2nd
> +     GMAC of the SOC.
> +     In the case of a build-in MT7530 switch, port 5 shares the RGMII bus with 2nd
> +     GMAC and an optional external phy. Mind the GPIO/pinctl settings of the SOC!
> +  2. Port 5 is muxed to PHY of port 0/4: Port 0/4 interfaces with 2nd GMAC.
> +     It is a simple MAC to PHY interface, port 5 needs to be setup for xMII mode
> +     and RGMII delay.
> +  3. Port 5 is muxed to GMAC5 and can interface to an external phy.
> +     Port 5 becomes an extra switch port.
> +     Only works on platform where external phy TX<->RX lines are swapped.
> +     Like in the Ubiquiti ER-X-SFP.
> +  4. Port 5 is muxed to GMAC5 and interfaces with the 2nd GAMC as 2nd CPU port.
> +     Currently a 2nd CPU port is not supported by DSA code.
> +
> +  Depending on how the external PHY is wired:
> +  1. normal: The PHY can only connect to 2nd GMAC but not to the switch
> +  2. swapped: RGMII TX, RX are swapped; external phy interface with the switch as
> +     a ethernet port. But can't interface to the 2nd GMAC.
> +
> +    Based on the DT the port 5 mode is configured.
> +
> +  Driver tries to lookup the phy-handle of the 2nd GMAC of the master device.
> +  When phy-handle matches PHY of port 0 or 4 then port 5 set-up as mode 2.
> +  phy-mode must be set, see also example 2 below!
> +  * mt7621: phy-mode = "rgmii-txid";
> +  * mt7623: phy-mode = "rgmii";
> +
> +  CPU-Ports need a phy-mode property:
> +    Allowed values on mt7530 and mt7621:
> +      - "rgmii"
> +      - "trgmii"
> +    On mt7531:
> +      - "1000base-x"
> +      - "2500base-x"
> +      - "sgmii"
> +
> +
> +properties:
> +  compatible:
> +    enum:
> +      - mediatek,mt7530
> +      - mediatek,mt7531
> +      - mediatek,mt7621
> +

> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 0

I don't see any child nodes with addresses, so these can be removed.

> +
> +  core-supply:
> +    description:
> +      Phandle to the regulator node necessary for the core power.
> +
> +  "#gpio-cells":
> +    const: 2
> +
> +  gpio-controller:
> +    type: boolean
> +    description:
> +      if defined, MT7530's LED controller will run on GPIO mode.
> +
> +  "#interrupt-cells":
> +    const: 1
> +
> +  interrupt-controller:
> +    type: boolean

Already has a type. Just:

interrupt-controller: true

> +
> +  interrupts:
> +    maxItems: 1
> +
> +  io-supply:
> +    description:
> +      Phandle to the regulator node necessary for the I/O power.
> +      See Documentation/devicetree/bindings/regulator/mt6323-regulator.txt
> +      for details for the regulator setup on these boards.
> +
> +  mediatek,mcm:
> +    type: boolean
> +    description:
> +      if defined, indicates that either MT7530 is the part on multi-chip
> +      module belong to MT7623A has or the remotely standalone chip as the
> +      function MT7623N reference board provided for.
> +
> +  reset-gpios:
> +    maxItems: 1
> +
> +  reset-names:
> +    const: mcm
> +
> +  resets:
> +    description:
> +      Phandle pointing to the system reset controller with line index for
> +      the ethsys.
> +    maxItems: 1
> +
> +patternProperties:
> +  "^(ethernet-)?ports$":
> +    type: object

       additionalProperties: false

> +
> +    patternProperties:
> +      "^(ethernet-)?port@[0-9]+$":
> +        type: object
> +        description: Ethernet switch ports
> +
> +        unevaluatedProperties: false
> +
> +        properties:
> +          reg:
> +            description:
> +              Port address described must be 5 or 6 for CPU port and from 0
> +              to 5 for user ports.
> +
> +        allOf:
> +          - $ref: dsa-port.yaml#
> +          - if:
> +              properties:
> +                label:
> +                  items:
> +                    - const: cpu
> +            then:
> +              required:
> +                - reg
> +                - phy-mode
> +
> +required:
> +  - compatible
> +  - reg
> +
> +allOf:
> +  - $ref: "dsa.yaml#"
> +  - if:
> +      required:
> +        - mediatek,mcm
> +    then:
> +      required:
> +        - resets
> +        - reset-names
> +    else:
> +      required:
> +        - reset-gpios
> +
> +  - if:
> +      required:
> +        - interrupt-controller
> +    then:
> +      required:
> +        - interrupts

This can be expressed as:

dependencies:
  interrupt-controller: [ interrupts ]
    
> +
> +  - if:
> +      properties:
> +        compatible:
> +          items:
> +            - const: mediatek,mt7530
> +    then:
> +      required:
> +        - core-supply
> +        - io-supply
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    mdio {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +        switch@0 {
> +            compatible = "mediatek,mt7530";
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +            reg = <0>;
> +
> +            core-supply = <&mt6323_vpa_reg>;
> +            io-supply = <&mt6323_vemc3v3_reg>;
> +            reset-gpios = <&pio 33 GPIO_ACTIVE_HIGH>;
> +
> +            ports {

Use the preferred form: ethernet-ports

> +                #address-cells = <1>;
> +                #size-cells = <0>;
> +                port@0 {