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dt-bindings: connector: Add property to set initial current cap for FRS 

This change adds frs-typec-current which allows setting the initial current
capability of the new source when vSafe5V is applied during PD3.0
sink Fast Role Swap.

Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20201020093627.256885-2-badhri@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Badhri Jagan Sridharan 2020-10-20 02:36:18 -07:00 committed by Greg Kroah-Hartman
parent 96eea5876e
commit 5ed132db5a
2 changed files with 27 additions and 0 deletions
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19
Documentation/devicetree/bindings/connector/usb-connector.yaml
View File

@ -147,6 +147,25 @@ properties:
required:
- port@0
new-source-frs-typec-current:
description: Initial current capability of the new source when vSafe5V
is applied during PD3.0 Fast Role Swap. "Table 6-14 Fixed Supply PDO - Sink"
of "USB Power Delivery Specification Revision 3.0, Version 1.2" provides the
different power levels and "6.4.1.3.1.6 Fast Role Swap USB Type-C Current"
provides a detailed description of the field. The sink PDO from current source
reflects the current source's(i.e. transmitter of the FRS signal) power
requirement during fr swap. The current sink (i.e. receiver of the FRS signal),
a.k.a new source, should check if it will be able to satisfy the current source's,
new sink's, requirement during frswap before enabling the frs signal reception.
This property refers to maximum current capability that the current sink can
satisfy. During FRS, VBUS voltage is at 5V, as the partners are in implicit
contract, hence, the power level is only a function of the current capability.
"1" refers to default USB power level as described by "Table 6-14 Fixed Supply PDO - Sink".
"2" refers to 1.5A@5V.
"3" refers to 3.0A@5V.
$ref: /schemas/types.yaml#/definitions/uint32
enum: [1, 2, 3]
required:
- compatible

8
include/dt-bindings/usb/pd.h
View File

@ -85,4 +85,12 @@
PDO_PPS_APDO_MIN_VOLT(min_mv) | PDO_PPS_APDO_MAX_VOLT(max_mv) | \
PDO_PPS_APDO_MAX_CURR(max_ma))
/*
* Based on "Table 6-14 Fixed Supply PDO - Sink" of "USB Power Delivery Specification Revision 3.0,
* Version 1.2"
* Initial current capability of the new source when vSafe5V is applied.
*/
#define FRS_DEFAULT_POWER 1
#define FRS_5V_1P5A 2
#define FRS_5V_3A 3
#endif /* __DT_POWER_DELIVERY_H */