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2020-10-02usb: dwc2: override PHY input signals with usb role switch supportAmelie Delaunay6-4/+210
This patch adds support for usb role switch to dwc2, by using overriding control of the PHY voltage valid and ID input signals. iddig signal (ID) can be overridden: - when setting GUSBCFG_FORCEHOSTMODE, iddig input pin is overridden with 1; - when setting GUSBCFG_FORCEDEVMODE, iddig input pin is overridden with 0. avalid/bvalid/vbusvalid signals can be overridden respectively with: - GOTGCTL_AVALOEN + GOTGCTL_AVALOVAL - GOTGCTL_BVALOEN + GOTGCTL_BVALOVAL - GOTGCTL_VBVALEN + GOTGCTL_VBVALOVAL It is possible to determine valid sessions thanks to usb role switch: - if USB_ROLE_NONE then !avalid && !bvalid && !vbusvalid - if USB_ROLE_DEVICE then !avalid && bvalid && vbusvalid - if USB_ROLE_HOST then avalid && !bvalid && vbusvalid Acked-by: Minas Harutyunyan <hminas@synopsys.com> Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
2020-10-02dt-bindings: usb: dwc2: add optional usb-role-switch propertyAmelie Delaunay1-0/+4
This patch documents the usb-role-switch property in dwc2 bindings, now that usb-role-switch support is available in dwc2 driver. Acked-by: Minas Harutyunyan <hminas@synopsys.com> Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
2020-10-02usb: dwc3: of-simple: Add compatible string for Intel Keem Bay platformWan Ahmad Zainie1-0/+1
Add compatible string to use this generic glue layer to support Intel Keem Bay platform's dwc3 controller. Signed-off-by: Wan Ahmad Zainie <wan.ahmad.zainie.wan.mohamad@intel.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>