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Date:   Tue, 26 May 2020 19:37:15 -0600
From:   Rob Herring <robh@...nel.org>
To:     Roger Quadros <rogerq@...com>
Cc:     balbi@...nel.org, vigneshr@...com, linux-usb@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] dt-bindings: usb: convert keystone-usb.txt to YAML

On Wed, May 13, 2020 at 04:07:07PM +0300, Roger Quadros wrote:
> Convert keystone-usb documentation to YAML format.
> 
> Signed-off-by: Roger Quadros <rogerq@...com>
> ---
>  .../devicetree/bindings/usb/keystone-usb.txt  | 56 ----------------
>  .../bindings/usb/ti,keystone-dwc3.yaml        | 67 +++++++++++++++++++
>  2 files changed, 67 insertions(+), 56 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/usb/keystone-usb.txt
>  create mode 100644 Documentation/devicetree/bindings/usb/ti,keystone-dwc3.yaml
> 
> diff --git a/Documentation/devicetree/bindings/usb/keystone-usb.txt b/Documentation/devicetree/bindings/usb/keystone-usb.txt
> deleted file mode 100644
> index 77df82e36138..000000000000
> --- a/Documentation/devicetree/bindings/usb/keystone-usb.txt
> +++ /dev/null
> @@ -1,56 +0,0 @@
> -TI Keystone Soc USB Controller
> -
> -DWC3 GLUE
> -
> -Required properties:
> - - compatible: should be
> -		"ti,keystone-dwc3" for Keystone 2 SoCs
> -		"ti,am654-dwc3" for AM654 SoC
> - - #address-cells, #size-cells : should be '1' if the device has sub-nodes
> -   with 'reg' property.
> - - reg : Address and length of the register set for the USB subsystem on
> -   the SOC.
> - - interrupts : The irq number of this device that is used to interrupt the
> -   MPU.
> - - ranges: allows valid 1:1 translation between child's address space and
> -   parent's address space.
> -
> -SoC-specific Required Properties:
> -The following are mandatory properties for Keystone 2 66AK2HK, 66AK2L and 66AK2E
> -SoCs only:
> -
> -- clocks:		Clock ID for USB functional clock.
> -- clock-names:		Must be "usb".
> -
> -
> -The following are mandatory properties for 66AK2G and AM654:
> -
> -- power-domains:	Should contain a phandle to a PM domain provider node
> -			and an args specifier containing the USB device id
> -			value. This property is as per the binding,
> -			Documentation/devicetree/bindings/soc/ti/sci-pm-domain.txt
> -
> -Sub-nodes:
> -The dwc3 core should be added as subnode to Keystone DWC3 glue.
> -- dwc3 :
> -   The binding details of dwc3 can be found in:
> -   Documentation/devicetree/bindings/usb/dwc3.txt
> -
> -Example:
> -	usb: usb@...0000 {
> -		compatible = "ti,keystone-dwc3";
> -		#address-cells = <1>;
> -		#size-cells = <1>;
> -		reg = <0x2680000 0x10000>;
> -		clocks = <&clkusb>;
> -		clock-names = "usb";
> -		interrupts = <GIC_SPI 393 IRQ_TYPE_EDGE_RISING>;
> -		ranges;
> -
> -		dwc3@...0000 {
> -			compatible = "synopsys,dwc3";
> -			reg = <0x2690000 0x70000>;
> -			interrupts = <GIC_SPI 393 IRQ_TYPE_EDGE_RISING>;
> -			usb-phy = <&usb_phy>, <&usb_phy>;
> -		};
> -	};
> diff --git a/Documentation/devicetree/bindings/usb/ti,keystone-dwc3.yaml b/Documentation/devicetree/bindings/usb/ti,keystone-dwc3.yaml
> new file mode 100644
> index 000000000000..14d2fe329b93
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/ti,keystone-dwc3.yaml
> @@ -0,0 +1,67 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/usb/ti,keystone-dwc3.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: TI Keystone Soc USB Controller
> +
> +maintainers:
> +  - Roger Quadros <rogerq@...com>
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - const: "ti,keystone-dwc3"
> +      - const: "ti,am654-dwc3"

Use enum rather than oneOf+const.

> +
> +  reg:
> +    maxItems: 1
> +    description: Address and length of the register set for the USB subsystem on
> +      the SOC.
> +
> +  interrupts:
> +    maxItems: 1
> +    description: The irq number of this device that is used to interrupt the MPU.

No need for genericish descriptions when a single item.

> +
> +
> +  clocks:
> +    description: Clock ID for USB functional clock.

How many?

> +
> +  power-domains:
> +    description: Should contain a phandle to a PM domain provider node
> +      and an args specifier containing the USB device id
> +      value. This property is as per the binding,
> +      Documentation/devicetree/bindings/soc/ti/sci-pm-domain.txt

How many?

> +
> +  dwc3:

This doesn't work because there's a unit address. You need a pattern.

> +    description: This is the node representing the DWC3 controller instance
> +      Documentation/devicetree/bindings/usb/dwc3.txt

type: object

> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks

additionalProperties: false

> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> +    usb: usb@...0000 {
> +      compatible = "ti,keystone-dwc3";
> +      #address-cells = <1>;
> +      #size-cells = <1>;

These have to be documented.

> +      reg = <0x2680000 0x10000>;
> +      clocks = <&clkusb>;
> +      clock-names = "usb";
> +      interrupts = <GIC_SPI 393 IRQ_TYPE_EDGE_RISING>;
> +      ranges;

This too.

> +
> +      dwc3@...0000 {
> +        compatible = "synopsys,dwc3";
> +        reg = <0x2690000 0x70000>;
> +        interrupts = <GIC_SPI 393 IRQ_TYPE_EDGE_RISING>;
> +        usb-phy = <&usb_phy>, <&usb_phy>;
> +      };
> +    };
> -- 
> Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
> Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
> 

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