linux-kernel - Re: [PATCH v3 14/19] dt-bindings: hwmon: (mr75203) add "moortec, ts-series" property

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Date:   Wed, 31 Aug 2022 11:42:35 +0200
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     "Farber, Eliav" <farbere@...zon.com>, jdelvare@...e.com,
        linux@...ck-us.net, robh+dt@...nel.org, rtanwar@...linear.com,
        linux-hwmon@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     talel@...zon.com, hhhawa@...zon.com, jonnyc@...zon.com,
        hanochu@...zon.com, ronenk@...zon.com, itamark@...zon.com,
        shellykz@...zon.com, shorer@...zon.com, amitlavi@...zon.com,
        almogbs@...zon.com, dkl@...zon.com, andriy.shevchenko@...el.com
Subject: Re: [PATCH v3 14/19] dt-bindings: hwmon: (mr75203) add "moortec,
 ts-series" property

On Mi, 2022-08-31 at 12:23 +0300, Farber, Eliav wrote:
> On 8/31/2022 11:23 AM, Philipp Zabel wrote:
> > On Di, 2022-08-30 at 19:22 +0000, Eliav Farber wrote:
> > > Add optional "moortec,ts-series" property to define the temperature
> > > equation and coefficients that shall be used to convert the digital
> > > output to value in milli-Celsius.
> > > Supported series: 5 (default) and 6.
> > 
> > Is this the difference between mr75xxx and mr76xxx series?
> > If so, should be a compatible "moortec,mr76006" instead?
> > If the temperature equation could be derived from the compatible, this
> > property would not be necessary.
> The PVT (Process, Voltage, Temperature) monitoring logic can be
> constructed from many different sub-blocks:
> *) CONTROLLER (mr75203) - controlling TS, PD and VM.
> *) TS (mr74137) - for measuring temperature in ring.
> *) PD (mr74139) - for measuring IO based transistors.
> *) VM (mr74138) - for measuring voltage rails across the SoC.
> *) Ring oscillators (mr76007/mr76008)
> *) Pre-scalers (mr76006)
>
> Besides mr75203 which is digital all other IPs are analog.
> There is a single mr75203 and there can be several or none of the other
> units.

Thank you for the explanation, I think this information would be nice
to have in a description in moortec,mr75203.yaml.

> The kernel driver is only for the controller (mr75203).
> The series 5 or 6 is relevant for the TS (mr74137) and not for the
> controller (mr75203).
> Each of the analog units can have a different series number (for example
> we use series 3 of the VM).
> 
> That is why I didn't change the compatible of mr75203, and instead added
> a TS-series parameter.

I see, I mistakenly assumed mr76006 referred to a new controller
version. This also invalidates my comment on patch 4.

regards
Philipp