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Subject[PATCH v9 05/15] dt-bindings: connector: Add property to set initial current cap for FRS
From
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>
---
Changes since v1:
- Changing patch version to v6 to fix version number confusion.

Changes since v6:
- Removed the redundant usb-connector.txt that I created by mistake.
- Moved to yaml.

Changes since v7:
- Rebase

Changes since v8:
- Redefine new-source-frs-typec-current as string enums to address
Rob Herring's comment.
---
.../bindings/connector/usb-connector.yaml | 26 +++++++++++++++++++
include/dt-bindings/usb/pd.h | 10 +++++++
2 files changed, 36 insertions(+)

diff --git a/Documentation/devicetree/bindings/connector/usb-connector.yaml b/Documentation/devicetree/bindings/connector/usb-connector.yaml
index 9bd52e63c935..0b8cd08a8678 100644
--- a/Documentation/devicetree/bindings/connector/usb-connector.yaml
+++ b/Documentation/devicetree/bindings/connector/usb-connector.yaml
@@ -142,6 +142,32 @@ 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.
+ "not-supported" implies sink to source fast role swap not supported.
+ "default" refers to default USB power level as described by
+ "Table 6-14 Fixed Supply PDO - Sink".
+ "1.5A" refers to 1.5A@5V.
+ "3.0A" refers to 3.0A@5V.
+
+ $ref: /schemas/types.yaml#/definitions/string
+ enum:
+ - not-supported
+ - default
+ - 1.5A
+ - 3.0A
+
required:
- compatible

diff --git a/include/dt-bindings/usb/pd.h b/include/dt-bindings/usb/pd.h
index 985f2bbd4d24..db1ad4532197 100644
--- a/include/dt-bindings/usb/pd.h
+++ b/include/dt-bindings/usb/pd.h
@@ -35,6 +35,16 @@

#define VSAFE5V 5000 /* mv units */

+/*
+ * 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_NOT_SUPPORTED 0
+#define FRS_DEFAULT_POWER 1
+#define FRS_5V_1P5A 2
+#define FRS_5V_3A 3
+
#define PDO_BATT_MAX_VOLT_SHIFT 20 /* 50mV units */
#define PDO_BATT_MIN_VOLT_SHIFT 10 /* 50mV units */
#define PDO_BATT_MAX_PWR_SHIFT 0 /* 250mW units */
--
2.28.0.709.gb0816b6eb0-goog
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