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

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Message-ID: <f49558fa-e987-145c-425e-0e8a7a9fba5f@amazon.com>
Date:   Wed, 31 Aug 2022 12:23:44 +0300
From:   "Farber, Eliav" <farbere@...zon.com>
To:     Philipp Zabel <p.zabel@...gutronix.de>, <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>, "Farber, Eliav" <farbere@...zon.com>
Subject: Re: [PATCH v3 14/19] dt-bindings: hwmon: (mr75203) add "moortec,
 ts-series" property

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.

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.

--
Regards, Eliav