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

[Chunfeng Yun <chunfeng.yun@mediatek.com>]

On Fri, 2020-10-16 at 12:14 -0500, Rob Herring wrote:
> 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.
Ok, will do 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...
No need refer to it again?

usb-hcd.yaml describes how to use phys/phy-names

> 
> > +
> > +  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.
Ok
> 
> > +
> > +  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?
Seems wrong, only support one, will modify it
>  How would there be more than 3 cells?
others will be ignored

> 
> > +
> > +      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