linux-kernel - Re: [PATCH 4/5] dt-bindings: usb: dwc3: of-simple: add compatible for HiSi

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Date:   Thu, 26 Sep 2019 09:34:18 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     John Stultz <john.stultz@...aro.org>
CC:     lkml <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <balbi@...nel.org>,
        "Andy Shevchenko" <andy.shevchenko@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Yu Chen <chenyu56@...wei.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <linux-usb@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH 4/5] dt-bindings: usb: dwc3: of-simple: add compatible
 for HiSi

On Wed, 2019-09-25 at 23:42 +0000, John Stultz wrote:
> Add necessary compatible flag for HiSi's DWC3 so
> dwc3-of-simple will probe.
> 
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Felipe Balbi <balbi@...nel.org>
> Cc: Andy Shevchenko <andy.shevchenko@...il.com>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Yu Chen <chenyu56@...wei.com>
> Cc: Matthias Brugger <matthias.bgg@...il.com>
> Cc: Chunfeng Yun <chunfeng.yun@...iatek.com>
> Cc: linux-usb@...r.kernel.org
> Cc: devicetree@...r.kernel.org
> Signed-off-by: John Stultz <john.stultz@...aro.org>
> ---
>  .../devicetree/bindings/usb/hisi,dwc3.txt     | 52 +++++++++++++++++++
>  1 file changed, 52 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/usb/hisi,dwc3.txt
> 
> diff --git a/Documentation/devicetree/bindings/usb/hisi,dwc3.txt b/Documentation/devicetree/bindings/usb/hisi,dwc3.txt
> new file mode 100644
> index 000000000000..dc31b8a3c006
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/hisi,dwc3.txt
> @@ -0,0 +1,52 @@
> +HiSi SuperSpeed DWC3 USB SoC controller
> +
> +Required properties:
> +- compatible:		should contain "hisilicon,hi3660-dwc3" for HiSi SoC
> +- clocks:		A list of phandle + clock-specifier pairs for the
> +			clocks listed in clock-names
> +- clock-names:		Should contain the following:
> +  "clk_usb3phy_ref"	Phy reference clk
It's not good idea to apply phy's clock in dwc3's node

> +  "aclk_usb3otg"	USB3 OTG aclk
> +
> +- assigned-clocks:	Should be:
> +				HI3660_ACLK_GATE_USB3OTG
> +- assigned-clock-rates: Should be:
> +				229Mhz (229000000) for HI3660_ACLK_GATE_USB3OTG
> +
> +Optional properties:
> +- resets:		Phandle to reset control that resets core and wrapper.
> +
> +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.
> +
> +Example device nodes:
> +
> +	usb3: hisi_dwc3 {
> +		compatible = "hisilicon,hi3660-dwc3";
> +		#address-cells = <2>;
> +		#size-cells = <2>;
> +		ranges;
> +
> +		clocks = <&crg_ctrl HI3660_CLK_ABB_USB>,
> +			 <&crg_ctrl HI3660_ACLK_GATE_USB3OTG>;
> +		clock-names = "clk_usb3phy_ref", "aclk_usb3otg";
> +
> +		assigned-clocks = <&crg_ctrl HI3660_ACLK_GATE_USB3OTG>;
> +		assigned-clock-rates = <229 000 000>;
> +		resets = <&crg_rst 0x90 8>,
> +			 <&crg_rst 0x90 7>,
> +			 <&crg_rst 0x90 6>,
> +			 <&crg_rst 0x90 5>;
> +
> +		dwc3: dwc3@...00000 {
> +			compatible = "snps,dwc3";
> +			reg = <0x0 0xff100000 0x0 0x100000>;
> +			interrupts = <0 159 4>, <0 161 4>;
> +			phys = <&usb_phy>;
> +			phy-names = "usb3-phy";
> +			dr_mode = "otg";
> +
> +			...
> +		};
> +	};