2018-04-03 16:29 GMT+08:00 Andrzej Hajda <a.hajda@xxxxxxxxxxx>: > > On 28.03.2018 18:06, Li Jun wrote: > > Add bingdings supported by current typec driver, so user can pass > > all those properties via dt. > > > > Signed-off-by: Li Jun <jun.li@xxxxxxx> > > --- > > .../bindings/connector/usb-connector.txt | 39 ++++++++++++++++++++++ > > 1 file changed, 39 insertions(+) > > > > diff --git a/Documentation/devicetree/bindings/connector/usb-connector.txt b/Documentation/devicetree/bindings/connector/usb-connector.txt > > index e1463f1..922f22b 100644 > > --- a/Documentation/devicetree/bindings/connector/usb-connector.txt > > +++ b/Documentation/devicetree/bindings/connector/usb-connector.txt > > @@ -15,6 +15,29 @@ Optional properties: > > - type: size of the connector, should be specified in case of USB-A, USB-B > > non-fullsize connectors: "mini", "micro". > > > > +Optional properties for usb-c-connector: > > +- power-type: should be one of "source", "sink" or "dual"(DRP) if typec > > + connector has power support. > > +- try-power-role: preferred power role if "dual"(DRP) can support Try.SNK > > + or Try.SRC, should be "sink" for Try.SNK or "source" for Try.SRC. > > +- data-type: should be one of "host", "device", "dual"(DRD) if typec > > + connector supports USB data. > > + > > +Required properties for usb-c-connector with power delivery support: > > +- source-pdos: An array of u32 with each entry providing supported power > > + source data object(PDO), the detailed bit definitions of PDO can be found > > + in "Universal Serial Bus Power Delivery Specification" chapter 6.4.1.2 > > + Source_Capabilities Message, the order of each entry(PDO) should follow > > + the PD spec chapter 6.4.1. Required for power source and power dual role. > > +- sink-pdos: An array of u32 with each entry providing supported power > > + sink data object(PDO), the detailed bit definitions of PDO can be found > > + in "Universal Serial Bus Power Delivery Specification" chapter 6.4.1.3 > > + Sink Capabilities Message, the order of each entry(PDO) should follow > > + the PD spec chapter 6.4.1. Required for power sink and power dual role. > > +- op-sink-microwatt-hours: Sink required operating power in micro > > + watt-hours, if source offered power is less then it, Capability Mismatch > > + is set, required for power sink and power dual role. > > I have lurked into specs and I am not sure what is the relation of this > field with PD protocol, there is Minimum Operating Power, Maximum > Operating Power and Operating Power present in different RDOs, there are > also similar fields in sink PDOs. > I guess it can be one of them, which one? Per current usage of op-sink-microwatt(operating_snk_mw in tcpm), this property is actually for max operating power, which is only used to judge capability mismatch, i.e. the required max current/power is larger than the selected source PDO can provide. After checking the PD spec about this, basically I think this property also can be removed, we can judge the capability mismatch by compare the selected source pdo and sink pdo, considering there are existing users of this field(operating_snk_mw in tcpm), I will check how this can be done. I am removing the other 3 max_snk_*, see [1] [1] https://www.spinics.net/lists/linux-usb/msg167262.html > why other ones are not > provided? What if this or any other property can be calculated only in > runtime? > I am not sure if any of them should be marked "required". > > > + > > Required nodes: > > - any data bus to the connector should be modeled using the OF graph bindings > > specified in bindings/graph.txt, unless the bus is between parent node and > > @@ -73,3 +96,19 @@ ccic: s2mm005@33 { > > }; > > }; > > }; > > + > > +3. USB-C connector attached to a typec port controller(ptn5110), which has > > +power delivery support and enables drp. > > + > > +typec: ptn5110@50 { > > + ... > > + usb_con: connector { > > + compatible = "usb-c-connector"; > > + label = "USB-C"; > > + power-type = "dual"; > > + try-power-role = "sink"; > > + source-pdos = <0x380190c8>; > > I understand from DT specification point of view cryptic numbers are OK, > but for sake of readability I strongly suggest use/define macros similar > to the ones present already in kernel: > source-pdos = < PDO_FIXED(5000, 400, PDO_FIXED_FLAGS) >; I agree it's easier to read, so with the proposed way, we need maintain a copy of those macros for dts(e.g. under dt-binding/usb/pd.h), right? thanks Jun > > It much less error prone, and makes review process much more easier. > > Regards > Andrzej > > > + sink-pdos = <0x380190c8 0x3802d0c8>; > > + op-sink-microwatt-hours = <9000000>; > > + }; > > +}; > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-usb" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
