linux-kernel - Re: [PATCH 0/5] Add support for Battery Status & Battery Caps AMS in TCPM

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Message-ID: <914a0df4-96d0-4cd4-ac87-3826fa9c1440@google.com>
Date: Fri, 14 Mar 2025 17:49:38 -0700
From: Amit Sunil Dhamne <amitsd@...gle.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Badhri Jagan Sridharan <badhri@...gle.com>,
 Sebastian Reichel <sre@...nel.org>,
 Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
 "Rafael J. Wysocki" <rafael@...nel.org>, Len Brown <len.brown@...el.com>,
 Pavel Machek <pavel@...nel.org>, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
 linux-pm@...r.kernel.org, RD Babiera <rdbabiera@...gle.com>,
 Kyle Tso <kyletso@...gle.com>
Subject: Re: [PATCH 0/5] Add support for Battery Status & Battery Caps AMS in
 TCPM

Hi Krzysztof,

Thanks for the review!

On 3/13/25 1:50 AM, Krzysztof Kozlowski wrote:
> On Wed, Mar 12, 2025 at 04:42:00PM -0700, Amit Sunil Dhamne wrote:
>> Support for Battery Status & Battery Caps messages in response to
>> Get_Battery_Status & Get_Battery_Cap request is required by USB PD devices
>> powered by battery, as per "USB PD R3.1 V1.8 Spec", "6.13 Message
>> Applicability" section. This patchset adds support for these AMSes
>> to achieve greater compliance with the spec.
> Which board uses it? I would be happy to see that connection between
> batteries and USB connector on the schematics of some real device. How
> does it look like?
Any board that uses a USB Type-C connector that supplies power into or 
out of a battery while operating in sink or source mode respectively. 
The VBUS is connected to the (battery + buck boost IC's CHGin/Vin) or a 
companion IFPMIC connected to a battery.  In our board we have USB 
Connector <-> IFPMIC <-> Battery.

Thanks,

Amit

> Best regards,
> Krzysztof
>