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
Reviewed-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxx>
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 a7278a9472ed9..640668960deb0 100644
--- a/arch/arm64/boot/dts/qcom/qrb4210-rb2.dts
+++ b/arch/arm64/boot/dts/qcom/qrb4210-rb2.dts
@@ -264,6 +264,10 @@ &pon_resin {
status = "okay";
};
+&eud {
+ status = "okay";
+};
+
&qupv3_id_0 {
status = "okay";
};
@@ -518,7 +522,28 @@ &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";
};
&usb_hsphy {
--
2.38.1
