Re: [PATCH v5 1/2] dt-bindings: usb: qcom,dwc3: Convert USB DWC3 bindings

[Rob Herring <robh@kernel.org>]

On Thu, Mar 26, 2020 at 12:36:07PM +0530, Sandeep Maheswaram wrote:
> Convert USB DWC3 bindings to DT schema format using json-schema.
> 
> Signed-off-by: Sandeep Maheswaram <sanm@codeaurora.org>
> ---
>  .../devicetree/bindings/usb/qcom,dwc3.txt          | 104 --------------
>  .../devicetree/bindings/usb/qcom,dwc3.yaml         | 158 +++++++++++++++++++++
>  2 files changed, 158 insertions(+), 104 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/usb/qcom,dwc3.txt
>  create mode 100644 Documentation/devicetree/bindings/usb/qcom,dwc3.yaml


> diff --git a/Documentation/devicetree/bindings/usb/qcom,dwc3.yaml b/Documentation/devicetree/bindings/usb/qcom,dwc3.yaml
> new file mode 100644
> index 0000000..0f69475
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/qcom,dwc3.yaml
> @@ -0,0 +1,158 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/usb/qcom,dwc3.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm SuperSpeed DWC3 USB SoC controller
> +
> +maintainers:
> +  - Manu Gautam <mgautam@codeaurora.org>
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          - qcom,msm8996-dwc3
> +          - qcom,msm8998-dwc3
> +          - qcom,sdm845-dwc3
> +      - const: qcom,dwc3
> +
> +  reg:
> +    description: Offset and length of register set for QSCRATCH wrapper
> +    maxItems: 1
> +
> +  "#address-cells":
> +    enum: [ 1, 2 ]
> +
> +  "#size-cells":
> +    enum: [ 1, 2 ]
> +
> +  power-domains:
> +    description: specifies a phandle to PM domain provider node
> +    maxItems: 1
> +
> +  clocks:
> +    description:
> +      A list of phandle and clock-specifier pairs for the clocks
> +      listed in clock-names.
> +    items:
> +      - description: System Config NOC clock.
> +      - description: Master/Core clock, has to be >= 125 MHz
> +          for SS operation and >= 60MHz for HS operation.
> +      - description: System bus AXI clock.
> +      - description: Mock utmi clock needed for ITP/SOF generation
> +          in host mode. Its frequency should be 19.2MHz.
> +      - description: Sleep clock, used for wakeup when
> +          USB3 core goes into low power mode (U3).
> +
> +  clock-names:
> +    items:
> +      - const: cfg_noc
> +      - const: core
> +      - const: iface
> +      - const: mock_utmi
> +      - const: sleep
> +
> +  assigned-clocks:
> +    items:
> +      - description: Phandle and clock specifier of MOCK_UTMI_CLK.
> +      - description: Phandle and clock specifoer of MASTER_CLK.
> +
> +  assigned-clock-rates:
> +    maxItems: 2

Need to drop this as it is redundant. Soon this will generate an error.

> +    items:
> +      - description: Must be 19.2MHz (19200000).

Sounds like a constraint:

- const: 19200000

> +      - description: Must be >= 60 MHz in HS mode, >= 125 MHz in SS mode.

- minimum: 60000000
  maximum: ?

> +
> +  resets:
> +    maxItems: 1
> +
> +  interrupts:
> +    items:
> +      - description: The interrupt that is asserted
> +          when a wakeup event is received on USB2 bus.
> +      - description: The interrupt that is asserted
> +          when a wakeup event is received on USB3 bus.
> +      - description: Wakeup event on DM line.
> +      - description: Wakeup event on DP line.
> +
> +  interrupt-names:
> +    items:
> +      - const: hs_phy_irq
> +      - const: ss_phy_irq
> +      - const: dm_hs_phy_irq
> +      - const: dp_hs_phy_irq
> +
> +  qcom,select-utmi-as-pipe-clk:
> +    description:
> +      If present, disable USB3 pipe_clk requirement.
> +      Used when dwc3 operates without SSPHY and only
> +      HS/FS/LS modes are supported.
> +    type: boolean
> +
> +# Required child node:
> +
> +patternProperties:
> +  "^dwc3@[0-9a-f]+$":
> +    type: object
> +    description:
> +      A child node must exist to represent the core DWC3 IP block
> +      The content of the node is defined in dwc3.txt.
> +
> +required:
> +  - compatible
> +  - reg
> +  - "#address-cells"
> +  - "#size-cells"
> +  - power-domains
> +  - clocks
> +  - clock-names
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/qcom,gcc-sdm845.h>
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    usb@a6f8800 {
> +        compatible = "qcom,sdm845-dwc3", "qcom,dwc3";
> +        reg = <0 0x0a6f8800 0 0x400>;
> +
> +        #address-cells = <2>;
> +        #size-cells = <2>;
> +
> +        clocks = <&gcc GCC_CFG_NOC_USB3_PRIM_AXI_CLK>,
> +                 <&gcc GCC_USB30_PRIM_MASTER_CLK>,
> +                 <&gcc GCC_AGGRE_USB3_PRIM_AXI_CLK>,
> +                 <&gcc GCC_USB30_PRIM_MOCK_UTMI_CLK>,
> +                 <&gcc GCC_USB30_PRIM_SLEEP_CLK>;
> +        clock-names = "cfg_noc", "core", "iface", "mock_utmi",
> +                      "sleep";
> +
> +        assigned-clocks = <&gcc GCC_USB30_PRIM_MOCK_UTMI_CLK>,
> +                          <&gcc GCC_USB30_PRIM_MASTER_CLK>;
> +        assigned-clock-rates = <19200000>, <150000000>;
> +
> +        interrupts = <GIC_SPI 131 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 486 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 488 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 489 IRQ_TYPE_LEVEL_HIGH>;
> +        interrupt-names = "hs_phy_irq", "ss_phy_irq",
> +                          "dm_hs_phy_irq", "dp_hs_phy_irq";
> +
> +        power-domains = <&gcc USB30_PRIM_GDSC>;
> +
> +        resets = <&gcc GCC_USB30_PRIM_BCR>;
> +
> +        dwc3@a600000 {
> +            compatible = "snps,dwc3";
> +            reg = <0 0x0a600000 0 0xcd00>;

You need 'ranges' in the parent for this address to be translatable.

> +            interrupts = <GIC_SPI 133 IRQ_TYPE_LEVEL_HIGH>;
> +            iommus = <&apps_smmu 0x740 0>;
> +            snps,dis_u2_susphy_quirk;
> +            snps,dis_enblslpm_quirk;
> +            phys = <&usb_1_hsphy>, <&usb_1_ssphy>;
> +            phy-names = "usb2-phy", "usb3-phy";
> +        };
> +    };
> -- 
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>