linux-kernel - Re: [PATCH v4 1/3] dt-bindings: usb: cdns-imx8qm: add imx8qm cdns3 glue layer

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Date:   Mon, 27 Mar 2023 08:12:43 -0500
From:   Rob Herring <robh@...nel.org>
To:     Frank Li <Frank.Li@....com>
Cc:     devicetree@...r.kernel.org, festevam@...il.com,
        imx@...ts.linux.dev, kernel@...gutronix.de,
        krzysztof.kozlowski+dt@...aro.org, krzysztof.kozlowski@...aro.org,
        linux-arm-kernel@...ts.infradead.org, linux-imx@....com,
        linux-kernel@...r.kernel.org, s.hauer@...gutronix.de,
        shawnguo@...nel.org
Subject: Re: [PATCH v4 1/3] dt-bindings: usb: cdns-imx8qm: add imx8qm cdns3
 glue layer

On Thu, Mar 23, 2023 at 12:31:14PM -0400, Frank Li wrote:
> NXP imx8qm integrates 1 cdns3 IP. This is glue layer device bindings.
> 
> Signed-off-by: Frank Li <Frank.Li@....com>
> ---
> Change from v3 to v4
> - Drop all clock-assign
> 
> Change from v2 to v3
> - Drop two fixed frequency clocks, it is system reset value, no need set now.
> If need, futher work/discuss on driver or dts change. It will not block this
> basic enablement work.
> - Drop lable
> - Drop some descriptions
> - Reg as second property.
> 
> Change from v1 to v2.
> - new add binding doc
> 
>  .../bindings/usb/fsl,imx8qm-cdns3.yaml        | 104 ++++++++++++++++++
>  1 file changed, 104 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/usb/fsl,imx8qm-cdns3.yaml
> 
> diff --git a/Documentation/devicetree/bindings/usb/fsl,imx8qm-cdns3.yaml b/Documentation/devicetree/bindings/usb/fsl,imx8qm-cdns3.yaml
> new file mode 100644
> index 000000000000..654d8704aa6f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/fsl,imx8qm-cdns3.yaml
> @@ -0,0 +1,104 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright (c) 2020 NXP
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/usb/fsl,imx8qm-cdns3.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: NXP iMX8QM Soc USB Controller
> +
> +maintainers:
> +  - Frank Li <Frank.Li@....com>
> +
> +properties:
> +  compatible:
> +    const: fsl,imx8qm-usb3
> +
> +  reg:
> +    items:
> +      - description: Register set for iMX USB3 Platform Control
> +
> +  "#address-cells":
> +    enum: [ 1, 2 ]
> +
> +  "#size-cells":
> +    enum: [ 1, 2 ]
> +
> +  ranges: true
> +
> +  clocks:
> +    items:
> +      - description: Standby clock. Used during ultra low power states.
> +      - description: USB bus clock for usb3 controller.
> +      - description: AXI clock for AXI interface.
> +      - description: ipg clock for register access.
> +      - description: Core clock for usb3 controller.
> +
> +  clock-names:
> +    items:
> +      - const: usb3_lpm_clk
> +      - const: usb3_bus_clk
> +      - const: usb3_aclk
> +      - const: usb3_ipg_clk
> +      - const: usb3_core_pclk

lpm, bus, aclk, ipg, core (or core_pclk) are sufficient.

> +
> +  power-domains:
> +    maxItems: 1
> +
> +# Required child node:
> +
> +patternProperties:
> +  "^usb@[0-9a-f]+$":
> +    $ref: cdns,usb3.yaml#
> +
> +required:
> +  - compatible
> +  - reg
> +  - "#address-cells"
> +  - "#size-cells"
> +  - ranges
> +  - clocks
> +  - clock-names
> +  - power-domains
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/imx8-lpcg.h>
> +    #include <dt-bindings/firmware/imx/rsrc.h>
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> +    usb@...10000 {
> +      compatible = "fsl,imx8qm-usb3";
> +      reg = <0x5b110000 0x10000>;
> +      ranges;
> +      clocks = <&usb3_lpcg IMX_LPCG_CLK_1>,
> +               <&usb3_lpcg IMX_LPCG_CLK_0>,
> +               <&usb3_lpcg IMX_LPCG_CLK_7>,
> +               <&usb3_lpcg IMX_LPCG_CLK_4>,
> +               <&usb3_lpcg IMX_LPCG_CLK_5>;
> +      clock-names = "usb3_lpm_clk", "usb3_bus_clk", "usb3_aclk",
> +                    "usb3_ipg_clk", "usb3_core_pclk";
> +      assigned-clocks = <&clk IMX_SC_R_USB_2 IMX_SC_PM_CLK_MST_BUS>;
> +      assigned-clock-rates = <250000000>;
> +      power-domains = <&pd IMX_SC_R_USB_2>;
> +      #address-cells = <1>;
> +      #size-cells = <1>;
> +
> +      usb@...20000 {
> +        compatible = "cdns,usb3";
> +        reg = <0x5b120000 0x10000>,   /* memory area for OTG/DRD registers */
> +              <0x5b130000 0x10000>,   /* memory area for HOST registers */
> +              <0x5b140000 0x10000>;   /* memory area for DEVICE registers */
> +        reg-names = "otg", "xhci", "dev";
> +        interrupt-parent = <&gic>;
> +        interrupts = <GIC_SPI 271 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 271 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 271 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 271 IRQ_TYPE_LEVEL_HIGH>;
> +        interrupt-names = "host", "peripheral", "otg", "wakeup";
> +        phys = <&usb3_phy>;
> +        phy-names = "cdns3,usb3-phy";
> +      };
> +    };
> -- 
> 2.34.1
>