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

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Message-ID: <9852e5a8-843d-48ae-90d0-7991628e93b3@google.com>
Date: Thu, 20 Mar 2025 14:11:33 -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

On 3/16/25 9:52 AM, Krzysztof Kozlowski wrote:
> On 15/03/2025 01:49, Amit Sunil Dhamne wrote:
>> 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
> If you keep responding like this, you will got nowhere, so let me
> re-iterate:
>
> Which upstream DTS (or upstream supported hardware) is going to use this
> binding, so I can see how you are going to implement it there in the
> entire system?

This is for maxim,max33359 Type-C controller.

This would property would have been present for the connector present in 
the typec device for gs101-oriole board (that uses the max33359 
controller).

However, I will be exploring existing bindings to describe the 
relationship for now.

>> 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.
> Which board is that?

gs101-oriole board.

Thanks,

Amit

>
> Best regards,
> Krzysztof