Re: [PATCH v4 1/2] dt-bindings: Documentation for qcom,eud

Bryan O'Donoghue
2020-02-04T02:51:32Z

On 31/01/2020 04:43, Avaneesh Kumar Dwivedi wrote:
> Documentation for Embedded USB Debugger (EUD) device tree bindings.
>
> Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>
> Signed-off-by: Prakruthi Deepak Heragu <pheragu@codeaurora.org>
> Signed-off-by: Avaneesh Kumar Dwivedi <akdwived@codeaurora.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..57476ce
> --- /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.

on chip to support 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 event consumer(i.e.USB controller for vbus
missing space
consumer (i.e.

> +attach/detach event) and EUD is established via a directed graph. EUD
> +act
The EUD acts

> as an output link and clients of EUD as input link of this directed
> +graph. Events flows through the directed graph only during debug mode.

Probably this is a very obvious question but, you mean debug and trace
events or do you mean VBUS/charger events?

> +
> +An example for EUD device node:
> +
> + eud: qcom,msm-eud@88e0000 {
> + 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>;
> + };
> + };
> + };
>