linux-kernel - Re: [PATCH v2 1/2] dt-bindings: Add Qualcomm USB Super-Speed PHY bindings

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Date:   Wed, 30 Jan 2019 14:02:18 -0600
From:   Rob Herring <robh@...nel.org>
To:     Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@...aro.org>
Cc:     gregkh@...uxfoundation.org, mark.rutland@....com, kishon@...com,
        jackp@...eaurora.org, andy.gross@...aro.org, swboyd@...omium.org,
        shawn.guo@...aro.org, vkoul@...nel.org, bjorn.andersson@...aro.org,
        khasim.mohammed@...aro.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] dt-bindings: Add Qualcomm USB Super-Speed PHY
 bindings

On Tue, Jan 29, 2019 at 12:35:14PM +0100, Jorge Ramirez-Ortiz wrote:
> Binding description for Qualcomm's Synopsys 1.0.0 super-speed PHY
> controller embedded in QCS404.
> 
> Based on Sriharsha Allenki's <sallenki@...eaurora.org> original
> definitions.
> 
> Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@...aro.org>
> ---
>  .../devicetree/bindings/usb/qcom,usb-ssphy.txt     | 73 ++++++++++++++++++++++
>  1 file changed, 73 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/usb/qcom,usb-ssphy.txt
> 
> diff --git a/Documentation/devicetree/bindings/usb/qcom,usb-ssphy.txt b/Documentation/devicetree/bindings/usb/qcom,usb-ssphy.txt
> new file mode 100644
> index 0000000..8ef6e39
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/qcom,usb-ssphy.txt
> @@ -0,0 +1,73 @@
> +Qualcomm Synopsys 1.0.0 SS phy controller
> +===========================================
> +
> +Synopsys 1.0.0 ss phy controller supports SS usb connectivity on Qualcomm
> +chipsets
> +
> +Required properties:
> +
> +- compatible:
> +    Value type: <string>
> +    Definition: Should contain "qcom,usb-ssphy".

This is in no way specific enough.

> +
> +- reg:
> +    Value type: <prop-encoded-array>
> +    Definition: USB PHY base address and length of the register map.
> +
> +- #phy-cells:
> +    Value type: <u32>
> +    Definition: Should be 0. See phy/phy-bindings.txt for details.
> +
> +- clocks:
> +    Value type: <prop-encoded-array>
> +    Definition: See clock-bindings.txt section "consumers". List of
> +		 three clock specifiers for reference, phy core and
> +		 pipe clocks.
> +
> +- clock-names:
> +    Value type: <string>
> +    Definition: Names of the clocks in 1-1 correspondence with the "clocks"
> +		 property. Must contain "ref", "phy" and "pipe".
> +
> +- vdd-supply:
> +    Value type: <phandle>
> +    Definition: phandle to the regulator VDD supply node.
> +
> +- vdda1p8-supply:
> +    Value type: <phandle>
> +    Definition: phandle to the regulator 1.8V supply node.
> +
> +
> +Optional child nodes:
> +
> +- vbus-supply:
> +    Value type: <phandle>
> +    Definition: phandle to the VBUS supply node.

Does the phy actually get supplied by Vbus? If not, then Vbus supply 
should be defined in a USB connector node.

> +
> +- resets:
> +    Value type: <prop-encoded-array>
> +    Definition: See reset.txt section "consumers". PHY reset specifiers
> +		 for phy core and COR resets.

COR or COM?

Looks to me the order is reversed.

> +
> +- reset-names:
> +    Value type: <string>
> +    Definition: Names of the resets in 1-1 correspondence with the "resets"
> +		 property. Must contain "com" and "phy".
> +
> +Example:
> +
> +usb3_phy: phy@...00 {

usb3-phy@...

> +	compatible = "qcom,usb-ssphy";
> +	reg = <0x78000 0x400>;
> +	#phy-cells = <0>;
> +	clocks = <&rpmcc RPM_SMD_LN_BB_CLK>,
> +		 <&gcc GCC_USB_HS_PHY_CFG_AHB_CLK>,
> +		 <&gcc GCC_USB3_PHY_PIPE_CLK>;
> +	clock-names = "ref", "phy", "pipe";
> +	resets = <&gcc GCC_USB3_PHY_BCR>,
> +		 <&gcc GCC_USB3PHY_PHY_BCR>;
> +	reset-names = "com", "phy";
> +	vdd-supply = <&vreg_l3_1p05>;
> +	vdda1p8-supply = <&vreg_l5_1p8>;
> +	vbus-supply = <&usb3_vbus_reg>;
> +};
> -- 
> 2.7.4
>