On Thu, Nov 5, 2020 at 6:24 AM Jun Li <lijun.kernel@xxxxxxxxx> wrote: > > Amelie DELAUNAY <amelie.delaunay@xxxxxx> 于2020年11月5日周四 下午7:36写道： > > > > On 11/4/20 10:08 PM, Rob Herring wrote: > > > On Fri, Oct 30, 2020 at 04:27:14PM +0100, Amelie DELAUNAY wrote: > > >> > > >> > > >> On 10/30/20 3:29 PM, Rob Herring wrote: > > >>> On Thu, Oct 29, 2020 at 11:49 AM Amelie DELAUNAY <amelie.delaunay@xxxxxx> wrote: > > >>>> > > >>>> > > >>>> > > >>>> On 10/29/20 4:40 PM, Rob Herring wrote: > > >>>>> On Thu, Oct 29, 2020 at 10:58:03AM +0100, Amelie Delaunay wrote: > > >>>>>> Power operation mode may depends on hardware design, so, add the optional > > >>>>>> property power-opmode for usb-c connector to select the power operation > > >>>>>> mode capability. > > >>>>>> > > >>>>>> Signed-off-by: Amelie Delaunay <amelie.delaunay@xxxxxx> > > >>>>>> --- > > >>>>>> .../bindings/connector/usb-connector.yaml | 18 ++++++++++++++++++ > > >>>>>> 1 file changed, 18 insertions(+) > > >>>>>> > > >>>>>> diff --git a/Documentation/devicetree/bindings/connector/usb-connector.yaml b/Documentation/devicetree/bindings/connector/usb-connector.yaml > > >>>>>> index 728f82db073d..200d19c60fd5 100644 > > >>>>>> --- a/Documentation/devicetree/bindings/connector/usb-connector.yaml > > >>>>>> +++ b/Documentation/devicetree/bindings/connector/usb-connector.yaml > > >>>>>> @@ -93,6 +93,24 @@ properties: > > >>>>>> - device > > >>>>>> - dual > > >>>>>> > > >>>>>> + power-opmode: > > >>>>> > > >>>>> I've acked this version: > > >>>>> > > >>>>> https://lore.kernel.org/r/20201020093627.256885-2-badhri@xxxxxxxxxx > > >>>>> > > >>>> > > >>>> frs is used for Fast Role Swap defined in USB PD spec. > > >>>> I understand it allows to get the same information but I'm wondering why > > >>>> the property name is limited to -frs- in this case. What about a > > >>>> non-power delivery USB-C connector ? > > >>> > > >>> I've got no idea. The folks that know USB-C and PD details need to get > > >>> together and work all this out. To me, it looks like the same thing... > > >>> > > >> > > >> It looks but... > > >> > > >> The purpose of power-opmode property is to configure the USB-C controllers, > > >> especially the non-PD USB-C controllers to determine the power operation > > >> mode that the Type C connector will support and will advertise through CC > > >> pins when it has no power delivery support, whatever the power role: Sink, > > >> Source or Dual > > >> The management of the property is the same that data-role and power-role > > >> properties, and done by USB Type-C Connector Class. > > >> > > >> new-source-frs-typec-current specifies initial current capability of the new > > >> source when vSafe5V is applied during PD3.0 Fast Role Swap. So here, this > > >> property is not applied at usb-c controller configuration level, but during > > >> PD Fast Role Swap, so when the Sink become the Source. > > >> Moreover, the related driver code says FRS can only be supported by DRP > > >> ports. So new-source-frs-typec-current property, in addition to being > > >> specific to PD, is also dedicated to DRP usb-c controller. > > >> The property is managed by Type-C Port Controller Manager for PD. > > > > > > But it's the same set of possible values, right? So we can align the > > > values at least. > > > > > > > USB Power Delivery FRS values are defined in > > include/dt-bindings/usb/pd.h > > I think this can be changed if both can be aligned. > > >to fit with drivers/usb/typec/tcpm/tcpm.c > > frs_typec_current enum. > > > > USB-C power operation mode values are defined in > > include/linux/usb/typec.h with typec_pwr_opmode enum and matching with > > string values of typec_pwr_opmodes tab. > > > > USB PD requires USB-C. > > USB-C doesn't requires USB PD. > > > > drivers/usb/typec/tcpm/tcpm.c already used typec_pwr_opmode values. > > > > USB PD specification Table 6-14 Fixed Supply PDO says: > > Fast Role Swap required USB Type-C Current (see also [USB Type-C 2.0]): > > Value | Description > > 00b | Fast Swap not supported (default) > > 01b | Default USB Power > > 10b | 1.5A @ 5V > > 11b | 3.0A @ 5V > > This is the value in PDO of sink, the FRS property value(or after translated) > actually is used to compare with above value. > > So I think both properties can share the same "value", maybe string > like below > > 10 static const char * const typec_pwr_opmodes[] = { > 11 [TYPEC_PWR_MODE_USB] = "default", > 12 [TYPEC_PWR_MODE_1_5A] = "1.5A", > 13 [TYPEC_PWR_MODE_3_0A] = "3.0A", > > > > > Note the *see also USB Type-C 2.0*. > > > > USB Type-C specification 4.6.2.1 USB Type-C Current says: > > The USB Type-C connector uses CC pins for configuration including an > > ability for a Source to advertise to its port partner (Sink) the amount > > of current it shall supply: > > • Default is the as-configured for high-power operation current value as > > defined by the USB Specification (500 mA for USB 2.0 ports; 900 mA or > > 1,500 mA for USB 3.2 ports in single-lane or dual-lane operation, > > respectively) > > • 1.5 A > > • 3.0 A > > > > > Can we align the names in some way? power-opmode and frs-source-opmode > > > or ?? > > how about typec-power-opmode and frs-new-source-opmode Sure. > > > > > > > > I let USB PD specialists answer. > > > > *frs* property fits with USB PD specification, so with USB PD protocol. > > *power-opmode fits with USB Type-C specification, so with USB-C hardware > > support. > > > > > Are these 2 properties mutually exclusive? > > I think yes. This should work to express that: allOf: - not: required: - typec-power-opmode - frs-new-source-opmode Rob
