Re: [PATCH v1 1/5] dt-bindings: usb: convert rockchip,dwc3.txt to yaml

[Johan Jonker <jbx6244@gmail.com>]

Hi Rob,

See questions below.

Kind regards,

Johan Jonker

On 2/1/21 8:41 PM, Johan Jonker wrote:
> In the past Rockchip dwc3 usb nodes were manually checked.
> With the conversion of snps,dwc3.yaml as common document
> we now can convert rockchip,dwc3.txt to yaml as well.
> 
> Added properties for rk3399 are:
>   resets
>   reset-names
> 
> Generic properties that are now also filtered:
>   "#address-cells"
>   "#size-cells"
>   ranges
> 
> Signed-off-by: Johan Jonker <jbx6244@gmail.com>
> ---
>  .../devicetree/bindings/usb/rockchip,dwc3.txt      |  56 -----------
>  .../devicetree/bindings/usb/rockchip,dwc3.yaml     | 107 +++++++++++++++++++++
>  2 files changed, 107 insertions(+), 56 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/usb/rockchip,dwc3.txt
>  create mode 100644 Documentation/devicetree/bindings/usb/rockchip,dwc3.yaml
> 
> diff --git a/Documentation/devicetree/bindings/usb/rockchip,dwc3.txt b/Documentation/devicetree/bindings/usb/rockchip,dwc3.txt
> deleted file mode 100644
> index 945204932..000000000
> --- a/Documentation/devicetree/bindings/usb/rockchip,dwc3.txt
> +++ /dev/null
> @@ -1,56 +0,0 @@
> -Rockchip SuperSpeed DWC3 USB SoC controller
> -
> -Required properties:
> -- compatible:	should contain "rockchip,rk3399-dwc3" for rk3399 SoC
> -- clocks:	A list of phandle + clock-specifier pairs for the
> -		clocks listed in clock-names
> -- clock-names:	Should contain the following:
> -  "ref_clk"	Controller reference clk, have to be 24 MHz
> -  "suspend_clk"	Controller suspend clk, have to be 24 MHz or 32 KHz
> -  "bus_clk"	Master/Core clock, have to be >= 62.5 MHz for SS
> -		operation and >= 30MHz for HS operation
> -  "grf_clk"	Controller grf clk
> -
> -Required child node:
> -A child node must exist to represent the core DWC3 IP block. The name of
> -the node is not important. The content of the node is defined in dwc3.txt.
> -
> -Phy documentation is provided in the following places:
> -Documentation/devicetree/bindings/phy/phy-rockchip-inno-usb2.yaml - USB2.0 PHY
> -Documentation/devicetree/bindings/phy/phy-rockchip-typec.txt     - Type-C PHY
> -
> -Example device nodes:
> -
> -	usbdrd3_0: usb@fe800000 {
> -		compatible = "rockchip,rk3399-dwc3";
> -		clocks = <&cru SCLK_USB3OTG0_REF>, <&cru SCLK_USB3OTG0_SUSPEND>,
> -			 <&cru ACLK_USB3OTG0>, <&cru ACLK_USB3_GRF>;
> -		clock-names = "ref_clk", "suspend_clk",
> -			      "bus_clk", "grf_clk";
> -		#address-cells = <2>;
> -		#size-cells = <2>;
> -		ranges;
> -		usbdrd_dwc3_0: dwc3@fe800000 {
> -			compatible = "snps,dwc3";
> -			reg = <0x0 0xfe800000 0x0 0x100000>;
> -			interrupts = <GIC_SPI 105 IRQ_TYPE_LEVEL_HIGH>;
> -			dr_mode = "otg";
> -		};
> -	};
> -
> -	usbdrd3_1: usb@fe900000 {
> -		compatible = "rockchip,rk3399-dwc3";
> -		clocks = <&cru SCLK_USB3OTG1_REF>, <&cru SCLK_USB3OTG1_SUSPEND>,
> -			 <&cru ACLK_USB3OTG1>, <&cru ACLK_USB3_GRF>;
> -		clock-names = "ref_clk", "suspend_clk",
> -			      "bus_clk", "grf_clk";
> -		#address-cells = <2>;
> -		#size-cells = <2>;
> -		ranges;
> -		usbdrd_dwc3_1: dwc3@fe900000 {
> -			compatible = "snps,dwc3";
> -			reg = <0x0 0xfe900000 0x0 0x100000>;
> -			interrupts = <GIC_SPI 110 IRQ_TYPE_LEVEL_HIGH>;
> -			dr_mode = "otg";
> -		};
> -	};
> diff --git a/Documentation/devicetree/bindings/usb/rockchip,dwc3.yaml b/Documentation/devicetree/bindings/usb/rockchip,dwc3.yaml
> new file mode 100644
> index 000000000..681086fa6
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/rockchip,dwc3.yaml
> @@ -0,0 +1,107 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/usb/rockchip,dwc3.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Rockchip SuperSpeed DWC3 USB SoC controller
> +
> +maintainers:
> +  - Heiko Stuebner <heiko@sntech.de>
> +
> +properties:
> +  compatible:
> +    enum:
> +      - rockchip,rk3399-dwc3
> +
> +  clocks:
> +    items:
> +      - description:
> +          Controller reference clock, must to be 24 MHz
> +      - description:
> +          Controller suspend clock, must to be 24 MHz or 32 KHz
> +      - description:
> +          Master/Core clock, must to be >= 62.5 MHz for SS
> +          operation and >= 30MHz for HS operation
> +      - description:
> +          Controller aclk_usb3_rksoc_axi_perf clock
> +      - description:
> +          Controller aclk_usb3 clock
> +      - description:
> +          Controller grf clock
> +
> +  clock-names:
> +    items:
> +      - const: ref_clk
> +      - const: suspend_clk
> +      - const: bus_clk

> +      - const: aclk_usb3_rksoc_axi_perf
> +      - const: aclk_usb3

This was not in the original document, but is needed to compile.

> +      - const: grf_clk
> +
> +  resets:
> +    maxItems: 1
> +
> +  reset-names:
> +    const: usb3-otg
> +
> +  "#address-cells":
> +    const: 2
> +
> +  "#size-cells":
> +    const: 2
> +
> +  ranges: true
> +
> +patternProperties:
> +  "^usb@[a-f0-9]+$":
> +    type: object
> +
> +    $ref: "snps,dwc3.yaml"
> +
> +    description:
> +      A child node must exist to represent the core DWC3 IP block.
> +      The content of the node is defined in snps,dwc3.yaml.
> +
> +      Phy documentation is provided in the following places.
> +
> +      USB2.0 PHY
> +      Documentation/devicetree/bindings/phy/phy-rockchip-inno-usb2.yaml
> +
> +      Type-C PHY
> +      Documentation/devicetree/bindings/phy/phy-rockchip-typec.txt
> +
> +    unevaluatedProperties: false
> +
> +additionalProperties: false
> +
> +required:
> +  - compatible
> +  - clocks
> +  - clock-names
> +  - "#address-cells"
> +  - "#size-cells"
> +  - ranges
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/rk3399-cru.h>
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>

> +    usbdrd3_0: usb@fe800000 {

The rk3399 has 2 dwc3 usb nodes. When we remove @fe800000 and @fe900000
in the rk3399.dtsi it complains about 2 identical usb root nodenames.
For this example to pass change to:

usbdrd3_0: usb ??

What to do with it in the dtsi??


> +      compatible = "rockchip,rk3399-dwc3";
> +      clocks = <&cru SCLK_USB3OTG0_REF>, <&cru SCLK_USB3OTG0_SUSPEND>,
> +               <&cru ACLK_USB3OTG0>, <&cru ACLK_USB3_RKSOC_AXI_PERF>,
> +               <&cru ACLK_USB3>, <&cru ACLK_USB3_GRF>;
> +      clock-names = "ref_clk", "suspend_clk",
> +                    "bus_clk", "aclk_usb3_rksoc_axi_perf",
> +                    "aclk_usb3", "grf_clk";
> +      #address-cells = <2>;
> +      #size-cells = <2>;

> +      ranges;

Ranges generates notifications. Could you advise if that is needed in
this dwc3 usb context and rk3399.dtsi or should it be removed?

> +      usbdrd_dwc3_0: usb@fe800000 {
> +        compatible = "snps,dwc3";
> +        reg = <0x0 0xfe800000 0x0 0x100000>;
> +        interrupts = <GIC_SPI 105 IRQ_TYPE_LEVEL_HIGH>;
> +        dr_mode = "otg";
> +      };
> +    };
>