linux-kernel - Re: [PATCH v4 0/7] typec: tcpm: Add sink side support for PPS

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Message-ID: <20180130132504.GH14922@kuha.fi.intel.com>
Date:   Tue, 30 Jan 2018 15:25:04 +0200
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Adam Thomson <Adam.Thomson.Opensource@...semi.com>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sebastian Reichel <sre@...nel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Yueyao Zhu <yueyao.zhu@...il.com>,
        Rui Miguel Silva <rmfrfs@...il.com>,
        linux-usb@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, support.opensource@...semi.com
Subject: Re: [PATCH v4 0/7] typec: tcpm: Add sink side support for PPS

On Tue, Jan 02, 2018 at 03:50:48PM +0000, Adam Thomson wrote:
> This patch set adds sink side support for the PPS feature introduced in the
> USB PD 3.0 specification.
> 
> The source PPS supply is represented using the Power Supply framework to provide
> access and control APIs for dealing with it's operating voltage and current,
> and switching between a standard PDO and PPS APDO operation. During standard PDO
> operation the voltage and current is read-only, but for APDO PPS these are
> writable as well to allow for control.
> 
> It should be noted that the keepalive for PPS is not handled within TCPM. The
> expectation is that the external user will be required to ensure re-requests
> occur regularly to ensure PPS remains and the source does not hard reset.

Sorry for the late reply. I don't have any major problems with these
other than with 6/7. The documentation should be for the psy class,
not tcpm. I'm also not comfortable with the "select POWER_SUPPLY", but
if Guenter does not think it's a problem, I'm fine with it. I guess we
can always, for example, introduce stubs for the power_supply*
functions, and drop the dependency later.

But as usual with tcpm.c, Guenter needs to give his ACK.

Oh yes, and Sebastian needs to ACK the power_supply changes or course.


Thanks,

-- 
heikki