linux-kernel - Re: [PATCH RESEND 3/7] dt-bindings: usb: hisilicon,hi3670-dwc3: add binding for Kirin970

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Date:   Thu, 16 Dec 2021 14:01:22 -0600
From:   Rob Herring <robh@...nel.org>
To:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Cc:     Wei Xu <xuwei5@...ilicon.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org
Subject: Re: [PATCH RESEND 3/7] dt-bindings: usb: hisilicon,hi3670-dwc3: add
 binding for Kirin970

On Wed, Dec 15, 2021 at 09:54:29AM +0100, Mauro Carvalho Chehab wrote:
> Add documentation for the DWC3 USB3 controller found on Kirin970
> CPUs.
> 
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
> ---
> 
> To avoid mailbombing on a large number of people, only mailing lists were C/C on the cover.
> See [PATCH RESEND 0/7] at: https://lore.kernel.org/all/cover.1639558366.git.mchehab+huawei@kernel.org/
> 
>  .../bindings/usb/hisilicon,hi3670-dwc3.yaml   | 105 ++++++++++++++++++
>  1 file changed, 105 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/usb/hisilicon,hi3670-dwc3.yaml
> 
> diff --git a/Documentation/devicetree/bindings/usb/hisilicon,hi3670-dwc3.yaml b/Documentation/devicetree/bindings/usb/hisilicon,hi3670-dwc3.yaml
> new file mode 100644
> index 000000000000..309a876ea615
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/hisilicon,hi3670-dwc3.yaml
> @@ -0,0 +1,105 @@
> +# SPDX-License-Identifier: GPL-2.0

dual license

> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/usb/hisilicon,hi3670-dwc3.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: HiSilicon Kirin970 USB3 Controller
> +
> +maintainers:
> +  - Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
> +
> +description:
> +  Bindings for the USB3 DWC3 controller present on Kirin970.
> +
> +properties:
> +  compatible:
> +    const: hisilicon,hi3670-dwc3
> +
> +  clocks:
> +    maxItems: 4
> +
> +  clock-names:
> +    items:
> +      - const: clk_gate_abb_usb
> +      - const: hclk_gate_usb3otg
> +      - const: clk_gate_usb3otg_ref
> +      - const: aclk_gate_usb3dvfs

Seems like abb, hclk, ref, and aclk would be sufficient. The names are 
local to the device.

> +
> +  ranges: true
> +
> +  assigned-clocks:
> +    maxItems: 1
> +
> +  assigned-clock-rates:
> +    maxItems: 1
> +
> +  resets:
> +    maxItems: 4

Need to define what they are.

> +
> +  '#address-cells':
> +    const: 2
> +
> +  '#size-cells':
> +    const: 2
> +
> +# Required child node:
> +
> +patternProperties:
> +  "^usb@[0-9a-f]+$":
> +    $ref: snps,dwc3.yaml#
> +
> +required:
> +  - compatible
> +  - ranges
> +  - clocks
> +  - clock-names
> +  - assigned-clocks
> +  - assigned-clock-rates
> +  - resets
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/hi3670-clock.h>
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +
> +    bus {
> +      #address-cells = <2>;
> +      #size-cells = <2>;
> +
> +      usb3: hisi_dwc3 {

dwc3 {

> +        compatible = "hisilicon,hi3670-dwc3";
> +        #address-cells = <2>;
> +        #size-cells = <2>;
> +        ranges;
> +
> +        clocks = <&crg_ctrl HI3670_CLK_GATE_ABB_USB>,
> +                 <&crg_ctrl HI3670_HCLK_GATE_USB3OTG>,
> +                 <&crg_ctrl HI3670_CLK_GATE_USB3OTG_REF>,
> +                 <&crg_ctrl HI3670_ACLK_GATE_USB3DVFS>;
> +        clock-names = "clk_gate_abb_usb",
> +                      "hclk_gate_usb3otg",
> +                      "clk_gate_usb3otg_ref",
> +                      "aclk_gate_usb3dvfs";
> +
> +        assigned-clocks = <&crg_ctrl HI3670_ACLK_GATE_USB3DVFS>;
> +        assigned-clock-rates = <238000000>;
> +        resets = <&crg_rst 0x90 6>,
> +                 <&crg_rst 0x90 7>,
> +                 <&usb31_misc_rst 0xA0 8>,
> +                 <&usb31_misc_rst 0xA0 9>;
> +
> +        dwc3: usb@...00000 {
> +          compatible = "snps,dwc3";
> +          reg = <0x0 0xff100000 0x0 0x100000>;
> +
> +          interrupts = <0 159 IRQ_TYPE_LEVEL_HIGH>,
> +                       <0 161 IRQ_TYPE_LEVEL_HIGH>;
> +
> +          phys = <&usb_phy>;
> +          phy-names = "usb3-phy";
> +        };
> +      };
> +    };
> -- 
> 2.33.1
> 
>