Messages in this thread | | | Subject | Re: [PATCH 1/5] dt-bindings: connector: add optional properties for Type-B | From | Hans de Goede <> | Date | Mon, 11 Mar 2019 12:04:03 +0100 |
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Hi,
On 11-03-19 12:00, Hans de Goede wrote: > Hi, > > On 11-03-19 09:06, Hans de Goede wrote: >> Hi, >> >> On 11-03-19 06:33, Chunfeng Yun wrote: >>> Hi, >>> >>> On Fri, 2019-03-08 at 13:07 +0100, Hans de Goede wrote: >>>> Hi, >>>> >>>> On 08-03-19 07:13, Chunfeng Yun wrote: >>>>> Add id-gpios, vbus-gpios, vbus-supply and pinctrl properties for >>>>> usb-b-connector >>>>> >>>>> Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com> >>>>> --- >>>>> .../devicetree/bindings/connector/usb-connector.txt | 10 ++++++++++ >>>>> 1 file changed, 10 insertions(+) >>>>> >>>>> diff --git a/Documentation/devicetree/bindings/connector/usb-connector.txt b/Documentation/devicetree/bindings/connector/usb-connector.txt >>>>> index a9a2f2fc44f2..7a07b0f4f973 100644 >>>>> --- a/Documentation/devicetree/bindings/connector/usb-connector.txt >>>>> +++ b/Documentation/devicetree/bindings/connector/usb-connector.txt >>>>> @@ -17,6 +17,16 @@ Optional properties: >>>>> - self-powered: Set this property if the usb device that has its own power >>>>> source. >>>>> +Optional properties for usb-b-connector: >>>>> +- id-gpios: gpio for USB ID pin. >>>> >>>> What about boards where the ID pin is *not* connected to a GPIO, >>>> but e.g. to a special pin on the PMIC which can also detect >>>> an ACA adapter ? Currently this case is handled by extcon >>>> drivers, but we have no way to set e.g. vbus-supply for the >>>> connector. Maybe in this case the usb-connector node should >>>> be a child of the PMIC node ? >>> Yes, it would be, PMIC is in charger of detecting the status of ID pin >> >> Ok, then I think this should be documented too. >> >>>> And in many cases there also is a mux to switch the datalines >>>> between the host and device(gadget) controllers, how should >>>> that be described in this model? See the new usb-role-switch >>>> code under drivers/usb/roles >>>> >>>> In some cases the mux is controlled through a gpio, so we >>>> may want to add a "mux-gpios" here in which case we also >>>> need to define what 0/1 means. >>> I'm not sure, the mux seems not belong to this connector, >>> and may need another driver to register usb-role-switch, >>> similar to: >>> >>> [v2,2/2] usb: typec: add typec switch via GPIO control >>> https://patchwork.kernel.org/patch/10834327/ >> >> Right the mux/role-switch will need a driver, but the "owner" >> of the usb_connector, e.g. the PMIC or the owner of the >> id GPIO pin needs to know which device is the role-switch so >> that it can set the role correctly based on the id-pin. >> >> Your binding already contains Vbus info, allowing the owner >> of the usb_connector to enable/disable Vbus based on the id-pin, >> but the owner will also be responsible for setting the role-switch. >> >> Note we cannot simply assume there will be only one role-switch, >> we really need some link from the usb_connector to the role-switch >> (or if it is a GPIO driven role-switch simply a role-switch-gpios >> member in the usb_connector). > > I see now in your "[PATCH v3 1/2] dt-bindings: usb: add documentation for > typec switch via GPIO" that you plan to use a > Documentation/devicetree/bindings/graph.txt style binding for this, > adding a remote-endpoint to the orientation-switch (in that patch), or > to the role-switch. > > But a Type-C port can have both an orientation-switch and a role-switch > (and a mux if it supports e.g. DP-altmode), how is the driver driving > the device which has the actual usb_c_connecter child-node to which > the remote-endpoints for both the orientation- and the role-switch points > supposed to figure out which is which ? > > Also it feels the wrong-way around to me to have the orientation-switch > point to the usb_c_connector, to me it would make more sense to have > the usb_c_connector point to a port on the orientation-switch.
I just noticed you put an "orientation-switch" bool property in the device which has the orientation-switch property, if we do something similar for the role-switch then that should solve this.
Regards,
Hans
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