linux-kernel - Re: [PATCH v4 3/4] dt-bindings: Add Qualcomm USB SuperSpeed PHY bindings

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Message-ID: <20190223165218.GB572@tuxbook-pro>
Date:   Sat, 23 Feb 2019 08:52:18 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@...aro.org>
Cc:     robh@...nel.org, swboyd@...omium.org, andy.gross@...aro.org,
        shawn.guo@...aro.org, gregkh@...uxfoundation.org,
        mark.rutland@....com, kishon@...com, jackp@...eaurora.org,
        devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, khasim.mohammed@...aro.org
Subject: Re: [PATCH v4 3/4] dt-bindings: Add Qualcomm USB SuperSpeed PHY
 bindings

On Thu 07 Feb 03:17 PST 2019, Jorge Ramirez-Ortiz wrote:

> Binding description for Qualcomm's Synopsys 1.0.0 SuperSpeed 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>
> ---
>  .../bindings/phy/qcom,snps-usb-ssphy.txt      | 79 +++++++++++++++++++
>  1 file changed, 79 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/qcom,snps-usb-ssphy.txt
> 
> diff --git a/Documentation/devicetree/bindings/phy/qcom,snps-usb-ssphy.txt b/Documentation/devicetree/bindings/phy/qcom,snps-usb-ssphy.txt
> new file mode 100644
> index 000000000000..354e6f9cef62
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/qcom,snps-usb-ssphy.txt
> @@ -0,0 +1,79 @@
> +Qualcomm Synopsys 1.0.0 SS phy controller
> +===========================================
> +
> +Qualcomm 1.0.0 SS phy controller supports SuperSpeed USB connectivity on
> +some Qualcomm platforms.
> +
> +Required properties:
> +
> +- compatible:
> +    Value type: <string>
> +    Definition: Should contain "qcom,snps-usb-ssphy".

Per Rob's request make this:

Should contain "qcom,qcs404-snps-usb-ssphy" and "qcom,snps-usb-ssphy"

You can then leave the driver matching on qcom,snps-usb-ssphy for now
and if we ever find this to be incompatible with other platforms we can
make the driver match on the platform-specific compatible.

> +
> +- 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 properties:
> +
> +- resets:
> +    Value type: <prop-encoded-array>
> +    Definition: See reset.txt section "consumers". Specifiers for COM and
> +		 PHY resets.
> +
> +- reset-names:
> +    Value type: <string>
> +    Definition: Names of the resets in 1-1 correspondence with the "resets"
> +		 property. Must contain "com" and "phy" if the property is
> +		 specified.
> +
> +Required child nodes:
> +
> +- usb connector node as defined in bindings/connector/usb-connector.txt
> +  containing the property vbus-supply.
> +
> +Example:
> +
> +usb3_phy: usb3-phy@...00 {
> +	compatible = "qcom,snps-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>;
> +	usb3_c_connector: usb3-c-connector {

The USB-C connector is attached both to the HS and SS PHYs, so I think
you should represent this external to this node and use of_graph to
query it.

So the connector should look similar to example 2 in
connector/usb-connector.txt.

Regards,
Bjorn

> +		compatible = "usb-c-connector";
> +		label = "USB-C";
> +		type = "micro";
> +		vbus-supply = <&usb3_vbus_reg>;
> +	};
> +};
> -- 
> 2.20.1
>