Message-ID: <20201221192628.GA401288@robh.at.kernel.org>
Date:   Mon, 21 Dec 2020 12:26:28 -0700
From:   Rob Herring <robh@...nel.org>
To:     Chunfeng Yun <chunfeng.yun@...iatek.com>
Cc:     Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Min Guo <min.guo@...iatek.com>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-usb@...r.kernel.org,
        Serge Semin <Sergey.Semin@...kalelectronics.ru>
Subject: Re: [PATCH v4 10/11] dt-bindings: usb: convert mediatek,mtu3.txt to
 YAML schema

On Wed, Dec 16, 2020 at 05:30:11PM +0800, Chunfeng Yun wrote:
> Convert mediatek,mtu3.txt to YAML schema mediatek,mtu3.yaml
> 
> Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
> ---
> v4:
>   1. refer to usb-drd.yaml insstead of usb/generic.txt
>   the following ones suggested by Rob:
>   2. add the number of phys supported
>   3. fix indentation of wakeup
>   4. add examples for port and connector
> 
> v3:
>   1. fix yamllint warning
>   2. remove pinctrl* properties
>   3. remove unnecessary '|'
>   4. drop unused labels in example
> 
> v2: new patch
> ---
>  .../devicetree/bindings/usb/mediatek,mtu3.txt | 108 -------
>  .../bindings/usb/mediatek,mtu3.yaml           | 278 ++++++++++++++++++
>  2 files changed, 278 insertions(+), 108 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/usb/mediatek,mtu3.txt
>  create mode 100644 Documentation/devicetree/bindings/usb/mediatek,mtu3.yaml
> 
> diff --git a/Documentation/devicetree/bindings/usb/mediatek,mtu3.txt b/Documentation/devicetree/bindings/usb/mediatek,mtu3.txt
> deleted file mode 100644
> index a82ca438aec1..000000000000
> --- a/Documentation/devicetree/bindings/usb/mediatek,mtu3.txt
> +++ /dev/null
> @@ -1,108 +0,0 @@
> -The device node for Mediatek USB3.0 DRD controller
> -
> -Required properties:
> - - compatible : should be "mediatek,<soc-model>-mtu3", "mediatek,mtu3",
> -	soc-model is the name of SoC, such as mt8173, mt2712 etc,
> -	when using "mediatek,mtu3" compatible string, you need SoC specific
> -	ones in addition, one of:
> -	- "mediatek,mt8173-mtu3"
> - - reg : specifies physical base address and size of the registers
> - - reg-names: should be "mac" for device IP and "ippc" for IP port control
> - - interrupts : interrupt used by the device IP
> - - power-domains : a phandle to USB power domain node to control USB's
> -	mtcmos
> - - vusb33-supply : regulator of USB avdd3.3v
> - - clocks : a list of phandle + clock-specifier pairs, one for each
> -	entry in clock-names
> - - clock-names : must contain "sys_ck" for clock of controller,
> -	the following clocks are optional:
> -	"ref_ck", "mcu_ck" and "dma_ck";
> - - phys : see usb-hcd.yaml in the current directory
> - - dr_mode : should be one of "host", "peripheral" or "otg",
> -	refer to usb/generic.txt
> -
> -Optional properties:
> - - #address-cells, #size-cells : should be '2' if the device has sub-nodes
> -	with 'reg' property
> - - ranges : allows valid 1:1 translation between child's address space and
> -	parent's address space
> - - extcon : external connector for vbus and idpin changes detection, needed
> -	when supports dual-role mode.
> -	it's considered valid for compatibility reasons, not allowed for
> -	new bindings, and use "usb-role-switch" property instead.
> - - vbus-supply : reference to the VBUS regulator, needed when supports
> -	dual-role mode.
> -	it's considered valid for compatibility reasons, not allowed for
> -	new bindings, and put into a usb-connector node.
> -	see connector/usb-connector.yaml.
> - - pinctrl-names : a pinctrl state named "default" is optional, and need be
> -	defined if auto drd switch is enabled, that means the property dr_mode
> -	is set as "otg", and meanwhile the property "mediatek,enable-manual-drd"
> -	is not set.
> - - pinctrl-0 : pin control group
> -	See: Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
> -
> - - maximum-speed : valid arguments are "super-speed", "high-speed" and
> -	"full-speed"; refer to usb/generic.txt
> - - usb-role-switch : use USB Role Switch to support dual-role switch, but
> -	not extcon; see usb/generic.txt.
> - - enable-manual-drd : supports manual dual-role switch via debugfs; usually
> -	used when receptacle is TYPE-A and also wants to support dual-role
> -	mode.
> - - wakeup-source: enable USB remote wakeup of host mode.
> - - mediatek,syscon-wakeup : phandle to syscon used to access the register
> -	of the USB wakeup glue layer between SSUSB and SPM; it depends on
> -	"wakeup-source", and has two arguments:
> -	- the first one : register base address of the glue layer in syscon;
> -	- the second one : hardware version of the glue layer
> -		- 1 : used by mt8173 etc
> -		- 2 : used by mt2712 etc
> - - mediatek,u3p-dis-msk : mask to disable u3ports, bit0 for u3port0,
> -	bit1 for u3port1, ... etc;
> -
> -additionally the properties from usb-hcd.yaml (in the current directory) are
> -supported.
> -
> -Sub-nodes:
> -The xhci should be added as subnode to mtu3 as shown in the following example
> -if host mode is enabled. The DT binding details of xhci can be found in:
> -Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.txt
> -
> -The port would be added as subnode if use "usb-role-switch" property.
> -	see graph.txt
> -
> -Example:
> -ssusb: usb@...71000 {
> -	compatible = "mediatek,mt8173-mtu3";
> -	reg = <0 0x11271000 0 0x3000>,
> -	      <0 0x11280700 0 0x0100>;
> -	reg-names = "mac", "ippc";
> -	interrupts = <GIC_SPI 64 IRQ_TYPE_LEVEL_LOW>;
> -	phys = <&phy_port0 PHY_TYPE_USB3>,
> -	       <&phy_port1 PHY_TYPE_USB2>;
> -	power-domains = <&scpsys MT8173_POWER_DOMAIN_USB>;
> -	clocks = <&topckgen CLK_TOP_USB30_SEL>, <&clk26m>,
> -		 <&pericfg CLK_PERI_USB0>,
> -		 <&pericfg CLK_PERI_USB1>;
> -	clock-names = "sys_ck", "ref_ck";
> -	vusb33-supply = <&mt6397_vusb_reg>;
> -	vbus-supply = <&usb_p0_vbus>;
> -	extcon = <&extcon_usb>;
> -	dr_mode = "otg";
> -	wakeup-source;
> -	mediatek,syscon-wakeup = <&pericfg 0x400 1>;
> -	#address-cells = <2>;
> -	#size-cells = <2>;
> -	ranges;
> -
> -	usb_host: xhci@...70000 {
> -		compatible = "mediatek,mt8173-xhci";
> -		reg = <0 0x11270000 0 0x1000>;
> -		reg-names = "mac";
> -		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";
> -		vusb33-supply = <&mt6397_vusb_reg>;
> -	};
> -};
> diff --git a/Documentation/devicetree/bindings/usb/mediatek,mtu3.yaml b/Documentation/devicetree/bindings/usb/mediatek,mtu3.yaml
> new file mode 100644
> index 000000000000..e39850dff073
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/mediatek,mtu3.yaml
> @@ -0,0 +1,278 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright (c) 2020 MediaTek
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/usb/mediatek,mtu3.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: MediaTek USB3 DRD Controller Device Tree Bindings
> +
> +maintainers:
> +  - Chunfeng Yun <chunfeng.yun@...iatek.com>
> +
> +allOf:
> +  - $ref: "usb-drd.yaml"
> +
> +description: |
> +  The DRD controller has a glue layer IPPC (IP Port Control), and its host is
> +  based on xHCI.
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          - mediatek,mt2712-mtu3
> +          - mediatek,mt8173-mtu3
> +          - mediatek,mt8183-mtu3
> +      - const: mediatek,mtu3
> +
> +  reg:
> +    items:
> +      - description: the registers of device MAC
> +      - description: the registers of IP Port Control
> +
> +  reg-names:
> +    items:
> +      - const: mac
> +      - const: ippc
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  power-domains:
> +    description: A phandle to USB power domain node to control USB's MTCMOS
> +    maxItems: 1
> +
> +  clocks:
> +    minItems: 1
> +    maxItems: 4

Don't need maxItems here.

> +    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
> +
> +  clock-names:
> +    minItems: 1
> +    maxItems: 4
> +    items:
> +      - const: sys_ck  # required, the following ones are optional
> +      - const: ref_ck
> +      - const: mcu_ck
> +      - const: dma_ck
> +
> +  phys:
> +    description: List of all the USB PHYs used
> +    minItems: 0
> +    maxItems: 9

Need to define what each one is.

> +
> +  vusb33-supply:
> +    description: Regulator of USB AVDD3.3v
> +
> +  vbus-supply:
> +    deprecated: true
> +    description: |
> +      Regulator of USB VBUS5v, needed when supports dual-role mode.
> +      Particularly, if use an output GPIO to control a VBUS regulator, should
> +      model it as a regulator. See bindings/regulator/fixed-regulator.yaml
> +      It's considered valid for compatibility reasons, not allowed for
> +      new bindings, and put into a usb-connector node.
> +
> +  dr_mode:
> +    enum: [host, peripheral, otg]
> +    default: otg
> +
> +  maximum-speed:
> +    enum: [super-speed-plus, super-speed, high-speed, full-speed]
> +
> +  "#address-cells":
> +    enum: [1, 2]
> +
> +  "#size-cells":
> +    enum: [1, 2]
> +
> +  ranges: true
> +
> +  extcon:
> +    deprecated: true
> +    description: |
> +      Phandle to the extcon device detecting the IDDIG/VBUS state, neede
> +      when supports dual-role mode.
> +      It's considered valid for compatibility reasons, not allowed for
> +      new bindings, and use "usb-role-switch" property instead.
> +
> +  usb-role-switch:
> +    $ref: /schemas/types.yaml#/definitions/flag
> +    description: Support role switch.
> +    type: boolean
> +
> +  connector:
> +    $ref: /connector/usb-connector.yaml#
> +    description:
> +      Connector for dual role switch, especially for "gpio-usb-b-connector"
> +    type: object
> +
> +  port:
> +    description:
> +      Any connector to the data bus of this controller should be modelled
> +      using the OF graph bindings specified, if the "usb-role-switch"
> +      property is used. See graph.txt
> +    type: object
> +
> +  enable-manual-drd:
> +    $ref: /schemas/types.yaml#/definitions/flag
> +    description:
> +      supports manual dual-role switch via debugfs; usually used when
> +      receptacle is TYPE-A and also wants to support dual-role mode.
> +    type: boolean
> +
> +  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 3 cells long.
> +    items:
> +      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:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: The mask to disable u3ports, bit0 for u3port0,
> +      bit1 for u3port1, ... etc
> +
> +# Required child node when support dual-role
> +patternProperties:
> +  "^usb@[0-9a-f]+$":
> +    type: object
> +    $ref: /usb/mediatek,mtk-xhci.yaml#
> +    description:
> +      The xhci should be added as subnode to mtu3 as shown in the following
> +      example if the host mode is enabled.
> +
> +dependencies:
> +  connector: [ 'usb-role-switch' ]
> +  port: [ 'usb-role-switch' ]
> +  wakeup-source: [ 'mediatek,syscon-wakeup' ]
> +
> +required:
> +  - compatible
> +  - reg
> +  - reg-names
> +  - interrupts
> +  - clocks
> +  - clock-names
> +
> +additionalProperties: false
> +
> +examples:
> +  # Dual role switch by extcon
> +  - |
> +    #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>
> +
> +    usb@...71000 {
> +        compatible = "mediatek,mt8173-mtu3", "mediatek,mtu3";
> +        reg = <0x11271000 0x3000>, <0x11280700 0x0100>;
> +        reg-names = "mac", "ippc";
> +        interrupts = <GIC_SPI 64 IRQ_TYPE_LEVEL_LOW>;
> +        phys = <&phy_port0 PHY_TYPE_USB3>, <&phy_port1 PHY_TYPE_USB2>;
> +        power-domains = <&scpsys MT8173_POWER_DOMAIN_USB>;
> +        clocks = <&topckgen CLK_TOP_USB30_SEL>;
> +        clock-names = "sys_ck";
> +        vusb33-supply = <&mt6397_vusb_reg>;
> +        vbus-supply = <&usb_p0_vbus>;
> +        extcon = <&extcon_usb>;
> +        dr_mode = "otg";
> +        wakeup-source;
> +        mediatek,syscon-wakeup = <&pericfg 0x400 1>;
> +        #address-cells = <1>;
> +        #size-cells = <1>;
> +        ranges;
> +
> +        xhci: usb@...70000 {
> +            compatible = "mediatek,mt8173-xhci", "mediatek,mtk-xhci";
> +            reg = <0x11270000 0x1000>;
> +            reg-names = "mac";
> +            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";
> +            vusb33-supply = <&mt6397_vusb_reg>;
> +        };
> +    };
> +
> +  # Enable/disable device by an input gpio for VBUS pin
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    #include <dt-bindings/power/mt2712-power.h>
> +
> +    usb@...c1000 {
> +        compatible = "mediatek,mt2712-mtu3", "mediatek,mtu3";
> +        reg = <0x112c1000 0x3000>, <0x112d0700 0x0100>;
> +        reg-names = "mac", "ippc";
> +        interrupts = <GIC_SPI 248 IRQ_TYPE_LEVEL_LOW>;
> +        phys = <&u2port2 PHY_TYPE_USB2>;
> +        power-domains = <&scpsys MT2712_POWER_DOMAIN_USB2>;
> +        clocks = <&topckgen CLK_TOP_USB30_SEL>;
> +        clock-names = "sys_ck";
> +        dr_mode = "peripheral";
> +        usb-role-switch;
> +
> +        connector {
> +            compatible = "gpio-usb-b-connector", "usb-b-connector";
> +            type = "micro";
> +            vbus-gpios = <&pio 13 GPIO_ACTIVE_HIGH>;
> +        };
> +    };
> +
> +  # Dual role switch with type-c
> +  - |
> +    usb@...01000 {
> +        compatible ="mediatek,mt8183-mtu3", "mediatek,mtu3";
> +        reg = <0x11201000 0x2e00>, <0x11203e00 0x0100>;
> +        reg-names = "mac", "ippc";
> +        interrupts = <GIC_SPI 72 IRQ_TYPE_LEVEL_LOW>;
> +        phys = <&u2port0 PHY_TYPE_USB2>;
> +        clocks = <&clk26m>;
> +        clock-names = "sys_ck";
> +        mediatek,syscon-wakeup = <&pericfg 0x400 1>;
> +        wakeup-source;
> +        dr_mode = "otg";
> +        usb-role-switch;
> +        #address-cells = <1>;
> +        #size-cells = <1>;
> +        ranges;
> +
> +        host: usb@...00000 {
> +            compatible = "mediatek,mt8183-xhci", "mediatek,mtk-xhci";
> +            reg = <0x11200000 0x1000>;
> +            reg-names = "mac";
> +            interrupts = <GIC_SPI 73 IRQ_TYPE_LEVEL_LOW>;
> +            clocks = <&clk26m>;
> +            clock-names = "sys_ck";
> +        };
> +
> +        port {
> +            usb_role_sw: endpoint {
> +                remote-endpoint = <&hs_ep>;
> +            };
> +        };
> +    };
> +
> +...
> -- 
> 2.18.0
> 

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