linux-kernel - Re: [PATCH v2 6/8] dt-bindings: soc: qcom: pmic-glink: Move X1E80100 out of fallbacks

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Message-ID: <b07200a2-4e7b-480e-a683-d116e7da8de8@kernel.org>
Date: Tue, 3 Jun 2025 08:47:14 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Fenglin Wu <fenglin.wu@....qualcomm.com>,
 Sebastian Reichel <sre@...nel.org>, Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Subbaraman Narayanamurthy <subbaraman.narayanamurthy@....qualcomm.com>,
 David Collins <david.collins@....qualcomm.com>, linux-pm@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
 kernel@....qualcomm.com, devicetree@...r.kernel.org,
 linux-usb@...r.kernel.org
Subject: Re: [PATCH v2 6/8] dt-bindings: soc: qcom: pmic-glink: Move X1E80100
 out of fallbacks

On 03/06/2025 08:42, Fenglin Wu wrote:
> 
> On 6/2/2025 3:40 PM, Krzysztof Kozlowski wrote:
>> On 30/05/2025 09:35, Fenglin Wu via B4 Relay wrote:
>>> From: Fenglin Wu <fenglin.wu@....qualcomm.com>
>>>
>>> Move X1E80100 out of the fallbacks of SM8550 in pmic-glink support.
>> Why?
>>
>> Do not describe what you do here, it's obvious. We see it from the diff.
>>
>>
>> Best regards,
>> Krzysztof
> 
> Previously, in qcom_battmgr driver, x1e80100 was specified with a match 
> data the same as sc8280xp, also sm8550 was treated a fallback of sm8350 
> without the need of a match data.
> 
> In ucsi_glink driver, sm8550 had a match data and x1e80100 was treated 
> as a fallback of sm8550. There was no issues to make x1e80100 as a 
> fallback of sm8550 from both qcom_battmgr and ucsi_glink driver perspective.
> 
> In patch [5/8] in this series, in qcom_battmgr driver, it added charge 
> control functionality for sm8550 and x1e80100 differently hence 
> different match data was specified for them, and it makes x1e80100 ad 
> sm8550 incompatible and they need to be treated differently.

So you break ABI and that's your problem to fix. You cannot make devices
incompatible without good justification.



Best regards,
Krzysztof