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* [PATCH v3 0/2] TCPM non-pd mode
@ 2021-07-28  9:29 Kyle Tso
  2021-07-28  9:29 ` [PATCH v3 1/2] dt-bindings: connector: Add pd-supported property Kyle Tso
  2021-07-28  9:29 ` [PATCH v3 2/2] usb: typec: tcpm: Support non-PD mode Kyle Tso
  0 siblings, 2 replies; 5+ messages in thread
From: Kyle Tso @ 2021-07-28  9:29 UTC (permalink / raw)
  To: linux, heikki.krogerus, gregkh, robh+dt
  Cc: badhri, linux-usb, linux-kernel, devicetree, Kyle Tso

The reason for this patch is to let the device/system policy decide
whether PD is going to be supported using devicetree properties.
                                                                                                    
A new dt property "pd-unsupported" is introduced and TCPM uses this
property as a flag to decide whether PD is supported. If the flag is
false (the dt property is not present), the RX functionality of the
low-level driver will not be enabled. The power negotiation related
states will be skipped as well. If the flag is true, everything is as
what it was before.                                                  
                                                                                                    
If "pd-unsupported" is present, and the port is SRC or DRP, another                               
existing dt property "typec-power-opmode" needs to be specified to                                  
indicate which Rp value should be used when the port is SRC.                                        
                                                                                                    
changes since v2:
- Negated the meaning and the name of the dt property. Now the name is
  "pd-unsupported"
- Changed the control flow if the port is SNK or DRP. Return directly if
  the flag is false (PD not supported). Read "self-powered" before that.

---
cover-letter in v2:
---
The reason for this patch is to let the device/system policy decide                                 
whether PD is going to be supported using devicetree properties.                                    
                                                                                                    
A new dt property "pd-supported" is introduced and TCPM uses this                                   
property as a flag to decide whether PD is supported. If the flag is                                
false, the RX functionality of the low-level driver will not be enabled.                            
The power negotiation related states will be skipped as well. If the                                
flag is true, everything is as what it was before.                                                  
                                                                                                    
If "pd-supported" is not present, and the port is SRC or DRP, another                               
existing dt property "typec-power-opmode" needs to be specified to                                  
indicate which Rp value should be used when the port is SRC.                                        
                                                                                                    
changes since v1:                                                                                   
- revise the patch to use dt properties

Kyle Tso (2):
  dt-bindings: connector: Add pd-supported property
  usb: typec: tcpm: Support non-PD mode

 .../bindings/connector/usb-connector.yaml     |  4 +
 drivers/usb/typec/tcpm/tcpm.c                 | 88 +++++++++++++++----
 2 files changed, 74 insertions(+), 18 deletions(-)

-- 
2.32.0.432.gabb21c7263-goog


^ permalink raw reply	[flat|nested] 5+ messages in thread

end of thread, other threads:[~2021-07-28 14:31 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-07-28  9:29 [PATCH v3 0/2] TCPM non-pd mode Kyle Tso
2021-07-28  9:29 ` [PATCH v3 1/2] dt-bindings: connector: Add pd-supported property Kyle Tso
2021-07-28 14:04   ` Guenter Roeck
2021-07-28  9:29 ` [PATCH v3 2/2] usb: typec: tcpm: Support non-PD mode Kyle Tso
2021-07-28 14:31   ` Guenter Roeck

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