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SubjectRe: [PATCH v1 09/12] usb: dwc3: Registering a role switch in the DRD code.
On Mon, Dec 03, 2018 at 11:45:12AM +0800, Yu Chen wrote:
> The Type-C drivers use USB role switch API to inform the
> system about the negotiated data role, so registering a role
> switch in the DRD code in order to support platforms with
> USB Type-C connectors.
>
> Cc: Felipe Balbi <balbi@kernel.org>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Signed-off-by: Yu Chen <chenyu56@huawei.com>
> Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
>
> --
> v0:
> The patch is provided by Heikki Krogerus. I modified and test it
> on Hikey960 platform.
> --
> ---
> drivers/usb/dwc3/core.h | 2 ++
> drivers/usb/dwc3/drd.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 51 insertions(+)

You need to select USB_ROLE_SWITCH in Kconfig:

diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
index 1a0404fda596..3a0cb9f1f38a 100644
--- a/drivers/usb/dwc3/Kconfig
+++ b/drivers/usb/dwc3/Kconfig
@@ -42,6 +42,7 @@ config USB_DWC3_DUAL_ROLE
bool "Dual Role mode"
depends on ((USB=y || USB=USB_DWC3) && (USB_GADGET=y || USB_GADGET=USB_DWC3))
depends on (EXTCON=y || EXTCON=USB_DWC3)
+ select USB_ROLE_SWITCH
help
This is the default mode of working of DWC3 controller where
both host and gadget features are enabled.
--
heikki

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