Re: [PATCH 02/18] dt-bindings: usb: Add NVIDIA Tegra XUSB device mode controller binding

[Rob Herring <robh@kernel.org>]

On Fri, Dec 06, 2019 at 04:20:05PM +0530, Nagarjuna Kristam wrote:
> Add device-tree binding documentation for the XUSB device mode controller
> present on Tegra210 and Tegra186 SoC. This controller supports the USB 3.0
> specification.
> 
> Signed-off-by: Nagarjuna Kristam <nkristam@nvidia.com>
> ---

Next time version your patches correctly and include version history 
here so I don't have to go look up why my R-by is missing.

>  .../devicetree/bindings/usb/nvidia,tegra-xudc.yaml | 204 +++++++++++++++++++++
>  1 file changed, 204 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/usb/nvidia,tegra-xudc.yaml
> 
> diff --git a/Documentation/devicetree/bindings/usb/nvidia,tegra-xudc.yaml b/Documentation/devicetree/bindings/usb/nvidia,tegra-xudc.yaml
> new file mode 100644
> index 0000000..b23c451
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/nvidia,tegra-xudc.yaml
> @@ -0,0 +1,204 @@
> +# SPDX-License-Identifier: GPL-2.0

Dual license new bindings please:

(GPL-2.0-only OR BSD-2-Clause)

> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/usb/nvidia,tegra-xudc.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: Device tree binding for NVIDIA Tegra XUSB device mode controller (XUDC)
> +
> +description:
> +  The Tegra XUDC controller supports both USB 2.0 HighSpeed/FullSpeed and
> +  USB 3.0 SuperSpeed protocols.
> +
> +maintainers:
> +  - Nagarjuna Kristam <nkristam@nvidia.com>
> +  - JC Kuo <jckuo@nvidia.com>
> +  - Thierry Reding <treding@nvidia.com>
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - items:
> +        - const: nvidia,tegra210-xudc # For Tegra210
> +      - items:
> +        - const: nvidia,tegra186-xudc # For Tegra186

Use 'enum' instead of oneOf+const.

> +
> +  interrupts:
> +    maxItems: 1
> +    description: Must contain the XUSB device interrupt.

Don't need a description for a single interrupt line.

> +
> +  power-domains:
> +    maxItems: 2
> +    description:
> +      A list of PM domain specifiers that reference each power-domain
> +      used by the XUSB device mode controller. This list must comprise of a
> +      specifier for the XUSBA and XUSBB power-domains.
> +      See ../power/power_domain.txt and ../arm/tegra/nvidia,tegra20-pmc.txt
> +      for details.

Just need:

items:
  - description: XUSBA power-domain
  - description: XUSBB power-domain

> +
> +  power-domains-names:
> +    maxItems: 2
> +    description:
> +       A list of names that represent each of the specifiers in
> +       the 'power-domains' property.

That's every 'power-domains-names'.

> +    items:
> +      - const: ss
> +      - const: dev

Okay, but those names don't match up with XUSBA and XUSBB. Names should 
be meaningful or local to the module, not the provider if that helps.

> +
> +  nvidia,xusb-padctl:
> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> +    description:
> +      phandle to the XUSB pad controller that is used to configure the USB pads
> +      used by the XUDC controller.
> +
> +  phys:
> +    minItems: 1
> +    description:
> +      Must contain an entry for each entry in phy-names.
> +      See ../phy/phy-bindings.txt for details.
> +
> +  phy-names:
> +    minItems: 1
> +    items:
> +      - const: usb2-0
> +      - const: usb2-1
> +      - const: usb2-2
> +      - const: usb2-3
> +      - const: usb3-0
> +      - const: usb3-1
> +      - const: usb3-2
> +      - const: usb3-3
> +
> +  avddio-usb-supply:
> +    description: PCIe/USB3 analog logic power supply. Must supply 1.05 V.
> +
> +  hvdd-usb-supply:
> +    description: USB controller power supply. Must supply 3.3 V.
> +
> +required:
> +  - compatible
> +  - power-domains
> +  - power-domain-names
> +  - nvidia,xusb-padctl
> +  - phys
> +  - phy-names
> +
> +allOf:
> +  - if:
> +      properties:
> +        compatible:
> +          items:
> +            const: nvidia,tegra210-xudc
> +
> +    then:
> +      properties:
> +        reg:
> +          maxItems: 3
> +          items:
> +          - description: XUSB device controller registers
> +          - description: XUSB device PCI Config registers
> +          - description: XUSB device registers.
> +        reg-names:
> +          maxItems: 3
> +          items:
> +            - const: base
> +            - const: fpci
> +            - const: ipfs

As these are a superset of tegra186, you can move this up and tegra186 
just needs to define 'maxItems: 2'.

> +        clocks:
> +          description:
> +            Must contain an entry for all clocks used. See ../clock/clock-bindings.txt
> +            for details.
> +          maxItems: 5
> +          items:
> +            - description: Clock to enable core XUSB dev clock.
> +            - description: Clock to enable XUSB super speed clock.
> +            - description: Clock to enable XUSB super speed dev clock.
> +            - description: Clock to enable XUSB high speed dev clock.
> +            - description: Clock to enable XUSB full speed dev clock.
> +        clock-names:
> +          items:
> +           - const: dev
> +           - const: ss
> +           - const: ss_src
> +           - const: hs_src
> +           - const: fs_src

I would re-order the last 2 entries so that you can do the same thing as 
I said for 'reg'.

> +      required:
> +        - reg
> +        - reg-names
> +        - clocks
> +        - clock-names

No need for these to be under the if. They are always required and 
don't have to be where defined by 'properties'.

> +        - avddio-usb-supply
> +        - hvdd-usb-supply
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: nvidia,tegra186-xudc
> +
> +    then:
> +      properties:
> +        reg:
> +          maxItems: 2
> +          items:
> +          - description: XUSB device controller registers
> +          - description: XUSB device PCI Config registers
> +        reg-names:
> +          maxItems: 2
> +          items:
> +            - const: base
> +            - const: fpci
> +        clocks:
> +          description:
> +            Must contain an entry for all clocks used. See ../clock/clock-bindings.txt
> +            for details.
> +          maxItems: 4
> +          items:
> +            - description: Clock to enable core XUSB dev clock.
> +            - description: Clock to enable XUSB super speed clock.
> +            - description: Clock to enable XUSB super speed dev clock.
> +            - description: Clock to enable XUSB full speed dev clock.
> +        clock-names:
> +          items:
> +           - const: dev
> +           - const: ss
> +           - const: ss_src
> +           - const: fs_src
> +      required:
> +        - reg
> +        - reg-names
> +        - clocks
> +        - clock-names
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/tegra210-car.h>
> +    #include <dt-bindings/gpio/tegra-gpio.h>
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> +    usb@700d0000 {
> +        compatible = "nvidia,tegra210-xudc";
> +        reg = <0x0 0x700d0000 0x0 0x8000>,
> +              <0x0 0x700d8000 0x0 0x1000>,
> +              <0x0 0x700d9000 0x0 0x1000>;
> +        reg-names = "base", "fpci", "ipfs";
> +
> +        interrupts = <GIC_SPI 44 IRQ_TYPE_LEVEL_HIGH>;
> +
> +        clocks = <&tegra_car TEGRA210_CLK_XUSB_DEV>,
> +                 <&tegra_car TEGRA210_CLK_XUSB_SS>,
> +                 <&tegra_car TEGRA210_CLK_XUSB_SSP_SRC>,
> +                 <&tegra_car TEGRA210_CLK_XUSB_HS_SRC>,
> +                 <&tegra_car TEGRA210_CLK_XUSB_FS_SRC>;
> +        clock-names = "dev", "ss", "ss_src", "hs_src", "fs_src";
> +
> +        power-domains = <&pd_xusbdev>, <&pd_xusbss>;
> +        power-domain-names = "dev", "ss";
> +
> +        nvidia,xusb-padctl = <&padctl>;
> +
> +        phys = <&micro_b>;
> +        phy-names = "usb2-0";
> +
> +        avddio-usb-supply = <&vdd_pex_1v05>;
> +        hvdd-usb-supply = <&vdd_3v3_sys>;
> +    };
> -- 
> 2.7.4
>