linux-kernel - Re: [PATCH 1/7] dt-bindings: soc: qcom: Add qcom-pbs bindings

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Message-ID: <7ecf968b-45b2-c6b7-86a7-8d8caccf5002@linaro.org>
Date:   Wed, 12 Jul 2023 22:11:36 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     Anjelique Melendez <quic_amelende@...cinc.com>,
        Rob Herring <robh@...nel.org>, pavel@....cz, lee@...nel.org,
        thierry.reding@...il.com, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, agross@...nel.org, andersson@...nel.org,
        konrad.dybcio@...aro.org, u.kleine-koenig@...gutronix.de,
        linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-pwm@...r.kernel.org
Subject: Re: [PATCH 1/7] dt-bindings: soc: qcom: Add qcom-pbs bindings

On 12/07/2023 16:35, Dmitry Baryshkov wrote:
>>>> Rob asked you - "Is there more than 1 instance in a PMIC?" - and you did
>>>> not answer positively, just mentioned something about drivers in
>>>> downstream, which do not matter. So is the answer for that question:
>>>> yes, you have two instances of the same PMIC differing by presence of
>>>> PBS and other features"?
>>>>
>>> Sorry that was a misunderstanding on my part.
>>> Yes, answer to Rob's question should have been "We have two instances of PMI632,
>>> where one instance holds the pbs peripheral and the other holds the lpg
>>> peripherals. The child node for pbs is needed so lpg client can access
>>> the PMI632 regmap which contains the pbs peripheral."
>>
>> I guess I miss here something. What is "LPG client"? I don't understand
>> why this LPG client needs existence of PBS node, to be able to get the
>> regmap.
>>
>> PBS is a child of PMIC, so it can get regmap from the parent. What's
>> more, which DT property passes the regmap from PMIC to LPG client?
> 
> There are some PMICs which claim two SPMI SIDs. For such PMICs, each
> SID is a separate device, so it is not directly possible to get the
> regmap of the other SID.

OK, maybe after implementing all the review changes - including dropping
that singleton pattern - this will be clearer. Please send new version
and we will discuss it from there.

Thank you.
Best regards,
Krzysztof