linux-kernel - Re: [PATCH v3 1/2] dt-bindings: Documentation for qcom,eud

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Date:   Sat, 17 Nov 2018 08:47:05 -0600
From:   Rob Herring <robh@...nel.org>
To:     Prakruthi Deepak Heragu <pheragu@...eaurora.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        ckadabi@...eaurora.org, tsoni@...eaurora.org,
        bryanh@...eaurora.org, psodagud@...eaurora.org,
        rnayak@...eaurora.org,
        Satya Durga Srinivasu Prabhala <satyap@...eaurora.org>
Subject: Re: [PATCH v3 1/2] dt-bindings: Documentation for qcom,eud

On Thu, Nov 15, 2018 at 11:32:53AM -0800, Prakruthi Deepak Heragu wrote:
> Documentation for Embedded USB Debugger (EUD) device tree bindings.

I asked questions on v2 which were never answered.

> 
> Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@...eaurora.org>
> Signed-off-by: Prakruthi Deepak Heragu <pheragu@...eaurora.org>
> ---
>  .../devicetree/bindings/soc/qcom/qcom,msm-eud.txt  | 43 ++++++++++++++++++++++
>  1 file changed, 43 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/soc/qcom/qcom,msm-eud.txt
> 
> diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,msm-eud.txt b/Documentation/devicetree/bindings/soc/qcom/qcom,msm-eud.txt
> new file mode 100644
> index 0000000..6d339e7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/qcom/qcom,msm-eud.txt
> @@ -0,0 +1,43 @@
> +* Qualcomm Technologies Inc Embedded USB Debugger (EUD)
> +
> +The EUD (Embedded USB Debugger) is a mini-USB hub implemented
> +on chip to support the USB-based debug and trace capabilities.
> +
> +Required properties:
> +
> + - compatible:  Should be "qcom,msm-eud"
> + - interrupts:  Interrupt number
> + - reg: Should be address and size of EUD register space
> +
> +EUD notifies clients for VBUS attach/detach and charger enable/disable
> +events. The link between client and EUD is established via a directed
> +graph. EUD has one endpoint of the graph link mentioning EUD as an
> +output link and clients of EUD should have the other endpoint of the
> +graph link as an input link.
> +
> +An example for EUD device node:
> +
> +	eud: qcom,msm-eud@...0000 {
> +		compatible = "qcom,msm-eud";
> +		interrupts = <GIC_SPI 492 IRQ_TYPE_LEVEL_HIGH>;
> +		reg = <0x88e0000 0x4000>;
> +		usb_con: connector {
> +                compatible = "usb-c-connector";
> +                label = "USB-C";
> +                port {
> +                	    eud_usb_output: endpoint {
> +                        	    remote-endpoint = <&eud_usb3_input>;
> +                        };
> +        	    };
> +        };
> +	};
> +
> +An example for EUD client:
> +
> +	usb3 {
> +		port {
> +                eud_usb3_input: endpoint {
> +                        remote-endpoint = <&eud_usb_output>;
> +                };
> +        };
> +	};
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>