Re: [PATCH 10/12] dt-bindings: usb: qcom,dwc3: Introduce flattened qcom,dwc3 binding

From: Krzysztof Kozlowski
Date: Tue Oct 17 2023 - 02:11:55 EST

On 17/10/2023 05:11, Bjorn Andersson wrote:
> The Qualcomm USB block consists of three intertwined parts, the XHCI,
> the DWC3 core and the Qualcomm DWC3 glue. The three parts can not be
> operated independently, but the binding was for historical reasons split
> to mimic the Linux driver implementation.
>
> The split binding also makes it hard to alter the implementation, as
> properties and resources are split between the two nodes, in some cases
> with some duplication.
>
> Introduce a new binding, with a single representation of the whole USB
> block in one node.
>
> Signed-off-by: Bjorn Andersson <quic_bjorande@xxxxxxxxxxx>
> ---
> .../devicetree/bindings/usb/qcom,dwc3.yaml | 482 +++++++++++++++++++++
> .../devicetree/bindings/usb/snps,dwc3.yaml | 14 +-
> 2 files changed, 491 insertions(+), 5 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/usb/qcom,dwc3.yaml b/Documentation/devicetree/bindings/usb/qcom,dwc3.yaml
> new file mode 100644
> index 000000000000..cb50261c6a36
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/qcom,dwc3.yaml
> @@ -0,0 +1,482 @@
> +# 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:
> + - Wesley Cheng <quic_wcheng@xxxxxxxxxxx>
> +
> +select:
> + properties:
> + compatible:
> + items:
> + - enum:
> + - qcom,ipq4019-dwc3
> + - qcom,ipq5018-dwc3
> + - qcom,ipq5332-dwc3
> + - qcom,ipq6018-dwc3
> + - qcom,ipq8064-dwc3
> + - qcom,ipq8074-dwc3
> + - qcom,ipq9574-dwc3
> + - qcom,msm8953-dwc3
> + - qcom,msm8994-dwc3
> + - qcom,msm8996-dwc3
> + - qcom,msm8998-dwc3
> + - qcom,qcm2290-dwc3
> + - qcom,qcs404-dwc3
> + - qcom,sa8775p-dwc3
> + - qcom,sc7180-dwc3
> + - qcom,sc7280-dwc3
> + - qcom,sc8180x-dwc3
> + - qcom,sc8280xp-dwc3
> + - qcom,sc8280xp-dwc3-mp
> + - qcom,sdm660-dwc3
> + - qcom,sdm670-dwc3
> + - qcom,sdm845-dwc3
> + - qcom,sdx55-dwc3
> + - qcom,sdx65-dwc3
> + - qcom,sdx75-dwc3
> + - qcom,sm4250-dwc3
> + - qcom,sm6115-dwc3
> + - qcom,sm6125-dwc3
> + - qcom,sm6350-dwc3
> + - qcom,sm6375-dwc3
> + - qcom,sm8150-dwc3
> + - qcom,sm8250-dwc3
> + - qcom,sm8350-dwc3
> + - qcom,sm8450-dwc3
> + - qcom,sm8550-dwc3

This enum could be replaced with '{}'. Alternatively, drop enum entire
select replaced with:
- contains
- items:
- const: qcom,dwc3
- const: snps,dwc3



> + - const: qcom,dwc3
> + - const: snps,dwc3
> + required:
> + - compatible
> +
> +properties:
> + compatible:
> + items:
> + - enum:
> + - qcom,ipq4019-dwc3
> + - qcom,ipq5018-dwc3
> + - qcom,ipq5332-dwc3
> + - qcom,ipq6018-dwc3
> + - qcom,ipq8064-dwc3
> + - qcom,ipq8074-dwc3
> + - qcom,ipq9574-dwc3
> + - qcom,msm8953-dwc3
> + - qcom,msm8994-dwc3
> + - qcom,msm8996-dwc3
> + - qcom,msm8998-dwc3
> + - qcom,qcm2290-dwc3
> + - qcom,qcs404-dwc3
> + - qcom,sa8775p-dwc3
> + - qcom,sc7180-dwc3
> + - qcom,sc7280-dwc3
> + - qcom,sc8180x-dwc3
> + - qcom,sc8280xp-dwc3
> + - qcom,sc8280xp-dwc3-mp
> + - qcom,sdm660-dwc3
> + - qcom,sdm670-dwc3
> + - qcom,sdm845-dwc3
> + - qcom,sdx55-dwc3
> + - qcom,sdx65-dwc3
> + - qcom,sdx75-dwc3
> + - qcom,sm4250-dwc3
> + - qcom,sm6115-dwc3
> + - qcom,sm6125-dwc3
> + - qcom,sm6350-dwc3
> + - qcom,sm6375-dwc3
> + - qcom,sm8150-dwc3
> + - qcom,sm8250-dwc3
> + - qcom,sm8350-dwc3
> + - qcom,sm8450-dwc3
> + - qcom,sm8550-dwc3
> + - const: qcom,dwc3
> + - const: snps,dwc3
> +
> + reg:
> + description: Offset and length of register set for QSCRATCH wrapper
> + maxItems: 1
> +
> + power-domains:
> + description: specifies a phandle to PM domain provider node

Drop description

> + maxItems: 1
> +
> + required-opps:
> + maxItems: 1
> +
> + clocks:
> + description: |
> + Several clocks are used, depending on the variant. Typical ones are::
> + - cfg_noc:: System Config NOC clock.
> + - core:: Master/Core clock, has to be >= 125 MHz for SS operation and >=
> + 60MHz for HS operation.
> + - iface:: System bus AXI clock.
> + - sleep:: Sleep clock, used for wakeup when USB3 core goes into low
> + power mode (U3).
> + - mock_utmi:: Mock utmi clock needed for ITP/SOF generation in host
> + mode. Its frequency should be 19.2MHz.
> + minItems: 1
> + maxItems: 9
> +
> + clock-names:
> + minItems: 1
> + maxItems: 9
> +
> + resets:
> + maxItems: 1
> +
> + interconnects:
> + maxItems: 2
> +
> + interconnect-names:
> + items:
> + - const: usb-ddr
> + - const: apps-usb
> +
> + interrupts:
> + minItems: 2
> + maxItems: 5
> +
> + interrupt-names:
> + minItems: 2
> + maxItems: 5
> +
> + 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
> +
> + wakeup-source: true
> +
> +# Required child node:

Drop


...

> diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> index d81c2e849ca9..d6914b8cef6a 100644
> --- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> +++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> @@ -44,14 +44,18 @@ properties:
> It's either a single common DWC3 interrupt (dwc_usb3) or individual
> interrupts for the host, gadget and DRD modes.
> minItems: 1
> - maxItems: 4
> + maxItems: 5
>
> interrupt-names:
> - minItems: 1
> - maxItems: 4
> oneOf:
> - - const: dwc_usb3
> - - items:
> + - minItems: 1
> + maxItems: 5
> + items:
> + - const: dwc_usb3
> + additionalItems: true

This is not correct change. Before, one dwc_usb3 interrupt was combined
allowed, or a set of host+peripheral+otg+wakeup. Now, you allow combined
dwc_usb3 with anything.



Best regards,
Krzysztof