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

[Farber, Eliav]

On 8/31/2022 12:42 PM, Philipp Zabel wrote:
> 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. 

For v4 I added a new patch which adds this description in
moortec,mr75203.yaml:

description: |
  A Moortec PVT (Process, Voltage, Temperature) monitoring logic design can
  include many different units.
  Such a design will usually consists of several Moortec's embedded 
analog IPs,
  and a single Moortec controller to configure and control the IPs.

  Some of the Moortec's analog hard IPs that can be used in a design:
  *) Temperature Sensor (TS) - used to monitor core temperature (e.g. 
mr74137).
  *) Voltage Monitor (VM) - used to monitor voltage levels (e.g. mr74138).
  *) Process Detector (PD) - used to assess silicon speed (e.g. mr74139).
  *) Delay Chain - ring oscillator connected to the PD, used to measure IO
     based transistors (e.g. mr76008 ring oscillator at 1.1V, mr76007 ring
     oscillator at 1.8V).
  *) Pre Scaler - provides divide-by-X scaling of input voltage, which 
can then
     be presented for VM for measurement within its range (e.g. mr76006 -
     divide by 2 pre-scaler).

  TS, VM & PD also include a digital interface, which consists of 
configuration
  inputs and measurement outputs.
  The mr75203 binding describes configuration for the controller unit, 
but also
  for some of the analog IPs.

--
Regards, Eliav