On 4.05.2023 10:26, Bhupesh Sharma wrote:
> Since the USB-C type port on the Qualcomm QRB4210-RB2 board
> can be set primarily in a 'device' configuration (with the default
> DIP switch settings), it makes sense to enable the EUD debug
> peripheral on the board by default by setting the USB 'dr_mode' property
> as 'otg'.
>
> Now, the EUD debug peripheral can be enabled by executing:
> $ echo 1 > /sys/bus/platform/drivers/qcom_eud/1610000.eud/enable
>
> Signed-off-by: Bhupesh Sharma <bhupesh.sharma@xxxxxxxxxx>
> ---
> arch/arm64/boot/dts/qcom/qrb4210-rb2.dts | 27 +++++++++++++++++++++++-
> 1 file changed, 26 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm64/boot/dts/qcom/qrb4210-rb2.dts b/arch/arm64/boot/dts/qcom/qrb4210-rb2.dts
> index 1a0776a0cfd0..0ce72f1ebc10 100644
> --- a/arch/arm64/boot/dts/qcom/qrb4210-rb2.dts
> +++ b/arch/arm64/boot/dts/qcom/qrb4210-rb2.dts
> @@ -30,6 +30,10 @@ vph_pwr: vph-pwr-regulator {
> };
> };
>
> +&eud {
> + status = "okay";
> +};
> +
> &qupv3_id_0 {
> status = "okay";
> };
> @@ -253,7 +257,28 @@ &usb {
>
> &usb_dwc3 {
> maximum-speed = "super-speed";
> - dr_mode = "peripheral";
> +
> + /*
> + * There is only one USB DWC3 controller on QRB4210 board and it is connected
> + * via a DIP Switch:
> + * - to either an USB - C type connector or an USB - A type connector
> + * (via a GL3590-S hub), and
> + * - to either an USB - A type connector (via a GL3590-S hub) or a connector
> + * for further connection with a mezzanine board.
> + *
> + * All of the above hardware muxes would allow us to hook things up in
> + * different ways to some potential benefit for static configurations (for e.g.
> + * on one hand we can have two USB - A type connectors and a USB - Ethernet
> + * connection available and on the other we can use the USB - C type in
> + * peripheral mode).
> + *
> + * Note that since the USB - C type can be used only in peripehral mode,
> + * so hardcoding the mode to 'peripheral' here makes sense.
> + *
> + * However since we want to use the EUD debug device, we set the mode as
> + * 'otg' here.
> + */
> + dr_mode = "otg";
So if I understand correctly, EUD works via the type-C connector and
only when the switch is turned such that the type-C connector is in use?
Konrad
> };
>
> &usb_hsphy {
