RE: [RFC PATCH v3 1/2] usb: typec: USB Type-C Port Manager (tcpm)

[Jun Li]

Hi Guenter,

> -----Original Message-----
> From: linux-usb-owner@xxxxxxxxxxxxxxx [mailto:linux-usb-
> owner@xxxxxxxxxxxxxxx] On Behalf Of Guenter Roeck
> Sent: Wednesday, August 24, 2016 5:11 AM
> To: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
> Cc: Chandra Sekhar Anagani <chandra.sekhar.anagani@xxxxxxxxx>; Bruce
> Ashfield <bruce.ashfield@xxxxxxxxxxxxx>; Bin Gao <bin.gao@xxxxxxxxx>;
> Pranav Tipnis <pranav.tipnis@xxxxxxxxx>; Heikki Krogerus
> <heikki.krogerus@xxxxxxxxxxxxxxx>; linux-kernel@xxxxxxxxxxxxxxx; linux-
> usb@xxxxxxxxxxxxxxx; Guenter Roeck <groeck@xxxxxxxxxxxx>
> Subject: [RFC PATCH v3 1/2] usb: typec: USB Type-C Port Manager (tcpm)
> 
> This driver implements the USB Type-C Power Delivery state machine
> for both source and sink ports. Alternate mode support is not
> fully implemented.
> 
> The driver attaches to the USB Type-C class code implemented in
> the following patches.
> 
> 	usb: typec: add driver for Intel Whiskey Cove PMIC USB Type-C PHY
> 	usb: USB Type-C connector class
> 
> This driver only implements the state machine. Lower level drivers are
> responsible for
> - Reporting VBUS status and activating VBUS
> - Setting CC lines and providing CC line status
> - Setting line polarity
> - Activating and deactivating VCONN
> - Setting the current limit
> - Activating and deactivating PD message transfers
> - Sending and receiving PD messages
> 
> The driver provides both a functional API as well as callbacks for
> lower level drivers.
> 
> Signed-off-by: Guenter Roeck <groeck@xxxxxxxxxxxx>
> ---

A specific question, if power sink wants to request a new power level
after SNK_READY, how to handle it with this tcpm?

Thanks
Li Jun