Re: [PATCH v2 6/8] dt-bindings: usb: convert mediatek,mtk-xhci.txt to YAML schema

[Rob Herring <robh@kernel.org>]

On Tue, Oct 13, 2020 at 04:52:05PM +0800, Chunfeng Yun wrote:
> Convert mediatek,mtk-xhci.txt to YAML schema mediatek,mtk-xhci.yaml
> 

There's some refactoring of usb-hcd.yaml and XHCI schema under review 
and this may need some refactoring on top of it.

> Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
> ---
> v2: new patch
> ---
>  .../bindings/usb/mediatek,mtk-xhci.txt        | 121 ------------
>  .../bindings/usb/mediatek,mtk-xhci.yaml       | 180 ++++++++++++++++++
>  2 files changed, 180 insertions(+), 121 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.txt
>  create mode 100644 Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml


> diff --git a/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml b/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml
> new file mode 100644
> index 000000000000..ea696c8f1269
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml
> @@ -0,0 +1,180 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright (c) 2020 MediaTek
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/usb/mediatek,mtk-xhci.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: MediaTek USB3 xHCI Device Tree Bindings
> +
> +maintainers:
> +  - Chunfeng Yun <chunfeng.yun@mediatek.com>
> +
> +allOf:
> +  - $ref: "usb-hcd.yaml"
> +
> +description: |
> +  There are two scenarios:
> +  case 1: only supports xHCI driver;
> +  case 2: supports dual-role mode, and the host is based on xHCI driver.
> +
> +properties:
> +  #common properties for both case 1 and case 2
> +  compatible:
> +    items:
> +      - enum:
> +          - mediatek,mt2712-xhci
> +          - mediatek,mt7622-xhci
> +          - mediatek,mt7629-xhci
> +          - mediatek,mt8173-xhci
> +          - mediatek,mt8183-xhci
> +      - const: mediatek,mtk-xhci
> +
> +  reg:
> +    minItems: 1
> +    maxItems: 2
> +    items:
> +      - description: the registers of xHCI MAC
> +      - description: the registers of IP Port Control
> +
> +  reg-names:
> +    minItems: 1
> +    maxItems: 2
> +    items:
> +      - const: mac
> +      - const: ippc  #optional, only needed for case 1.
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  power-domains:
> +    description: A phandle to USB power domain node to control USB's MTCMOS
> +    maxItems: 1
> +
> +  clocks:
> +    minItems: 1
> +    maxItems: 5
> +    items:
> +      - description: Controller clock used by normal mode
> +      - description: Reference clock used by low power mode etc
> +      - description: Mcu bus clock for register access
> +      - description: DMA bus clock for data transfer
> +      - description: controller clock
> +
> +  clock-names:
> +    minItems: 1
> +    maxItems: 5
> +    items:
> +      - const: sys_ck  #required, the following ones are optional
> +      - const: ref_ck
> +      - const: mcu_ck
> +      - const: dma_ck
> +      - const: xhci_ck
> +
> +  phys:
> +    $ref: /usb/usb-hcd.yaml#

That doesn't look right...

> +
> +  vusb33-supply:
> +    description: Regulator of USB AVDD3.3v
> +
> +  vbus-supply:
> +    description: Regulator of USB VBUS5v
> +
> +  usb3-lpm-capable:
> +    description: supports USB3.0 LPM
> +    type: boolean
> +
> +  imod-interval-ns:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: |
> +      Interrupt moderation interval value, it is 8 times as much as that
> +      defined in the xHCI spec on MTK's controller.
> +    default: 5000
> +
> +  #the following properties are only used for case 1
> +  pinctrl-0:
> +    description: A phandle to the default pinctrl state.
> +
> +  pinctrl-names:
> +    description: A pinctrl state named "default" must be defined.
> +      See pinctrl/pinctrl-bindings.txt
> +    const: default

Don't need pinctrl-* properties. They are always allowed.

> +
> +  wakeup-source:
> +    description: enable USB remote wakeup, see power/wakeup-source.txt
> +    type: boolean
> +
> +  mediatek,syscon-wakeup:
> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> +    maxItems: 1
> +    description: |
> +      A phandle to syscon used to access the register of the USB wakeup glue
> +      layer between xHCI and SPM, the field should always be a multiple of
> +      3 cells long.

A multiple of 3? How would there be more than 3 cells?

> +
> +      items:
> +        - description:
> +            The first cell represents a phandle to syscon
> +        - description:
> +            The second cell represents the register base address of the glue
> +            layer in syscon
> +        - description:
> +            The third cell represents the hardware version of the glue layer,
> +            1 is used by mt8173 etc, 2 is used by mt2712 etc
> +          enum: [1, 2]
> +
> +  mediatek,u3p-dis-msk:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: The mask to disable u3ports, bit0 for u3port0,
> +      bit1 for u3port1, ... etc
> +
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 0
> +
> +patternProperties:
> +  "^[a-f]+@[0-9a-f]+$":
> +    $ref: /usb/usb-hcd.yaml#
> +    type: object
> +    description: The hard wired USB devices.
> +
> +dependencies:
> +  wakeup-source: [ 'mediatek,syscon-wakeup' ]
> +
> +required:
> +  - compatible
> +  - reg
> +  - reg-names
> +  - interrupts
> +  - clocks
> +  - clock-names
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/mt8173-clk.h>
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    #include <dt-bindings/phy/phy.h>
> +    #include <dt-bindings/power/mt8173-power.h>
> +
> +    usb3: usb@11270000 {
> +        compatible = "mediatek,mt8173-xhci", "mediatek,mtk-xhci";
> +        reg = <0x11270000 0x1000>, <0x11280700 0x0100>;
> +        reg-names = "mac", "ippc";
> +        interrupts = <GIC_SPI 115 IRQ_TYPE_LEVEL_LOW>;
> +        power-domains = <&scpsys MT8173_POWER_DOMAIN_USB>;
> +        clocks = <&topckgen CLK_TOP_USB30_SEL>, <&clk26m>;
> +        clock-names = "sys_ck", "ref_ck";
> +        phys = <&u3port0 PHY_TYPE_USB3>, <&u2port1 PHY_TYPE_USB2>;
> +        vusb33-supply = <&mt6397_vusb_reg>;
> +        vbus-supply = <&usb_p1_vbus>;
> +        imod-interval-ns = <10000>;
> +        mediatek,syscon-wakeup = <&pericfg 0x400 1>;
> +        wakeup-source;
> +        usb3-lpm-capable;
> +    };
> +...
> -- 
> 2.18.0