linux-kernel - Re: [PATCH v2 1/2] hwmon:(pmbus/tda38740a) TDA38740A Voltage Regulator Driver

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Message-ID: <CAJKbuCYUCr-R-91Ou1y6XDEPdqabSDvCxUypc-YmW=-EPxgNyQ@mail.gmail.com>
Date: Thu, 22 Jan 2026 17:12:44 +0530
From: ashish yadav <ashishyadav78@...il.com>
To: Guenter Roeck <linux@...ck-us.net>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, linux-hwmon@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	ASHISH YADAV <Ashish.Yadav@...ineon.com>
Subject: Re: [PATCH v2 1/2] hwmon:(pmbus/tda38740a) TDA38740A Voltage
 Regulator Driver

Hi Guenter,

Please find my response inline.

Thanks & Regards
   Ashish Yadav

On Tue, Jan 13, 2026 at 8:40 PM Guenter Roeck <linux@...ck-us.net> wrote:
>
> On 1/12/26 23:24, ashish yadav wrote:
>
> >> The need for this, especially why it would only be needed for PMBUS_READ_VOUT
> >> but not for any other VOUT related commands, is still insufficiently explained
> >> (and I failed to understand the rationale provided earlier).
> >>
> >
> > It is specifically needed for READ_VOUT as it is being used by
> > external controller to monitor the rail health.
> > Other Vout related parameters are used internally in the IC to for
> > output voltage related protections and does not impact any external
> > decision making.
> >
>
> Sorry, that doesn't really make sense. How would the chip know to match
> VOUT with its VOUT limits if both don't use the same scale ?
>
The chip telemetry would still show Vout as 0.7V as it does not know
about the external feedback resistors.
Hence, no need to scale internal Vout related parameters.
This scale is only for external vendor use to tweak their telemetry
output voltage reading.

> Guenter
>