linux-kernel - Re: [PATCH 05/11] dt-bindings: thermal: k3-j72xx: elaborate on binding descriptions

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Message-ID: <20221012181911.qk7v3yabo726lmtl@bryanbrattlof.com>
Date:   Wed, 12 Oct 2022 13:19:11 -0500
From:   Bryan Brattlof <bb@...com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
CC:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>, Nishanth Menon <nm@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Tero Kristo <kristo@...nel.org>, Keerthy <j-keerthy@...com>,
        Linux Thermal <linux-pm@...r.kernel.org>,
        Linux Device Tree <devicetree@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 05/11] dt-bindings: thermal: k3-j72xx: elaborate on
 binding descriptions

On October 12, 2022 thus sayeth Krzysztof Kozlowski:
> On 11/10/2022 19:17, Bryan Brattlof wrote:
> > Elaborate on the function of this device node as well as some of the
> > properties that this node uses.
> > 
> > Signed-off-by: Bryan Brattlof <bb@...com>
> > ---
> >  .../bindings/thermal/ti,j72xx-thermal.yaml    | 27 ++++++++++++++++++-
> >  1 file changed, 26 insertions(+), 1 deletion(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/thermal/ti,j72xx-thermal.yaml b/Documentation/devicetree/bindings/thermal/ti,j72xx-thermal.yaml
> > index c74f124ebfc00..0b6a6fa07a532 100644
> > --- a/Documentation/devicetree/bindings/thermal/ti,j72xx-thermal.yaml
> > +++ b/Documentation/devicetree/bindings/thermal/ti,j72xx-thermal.yaml
> > @@ -9,6 +9,24 @@ title: Texas Instruments J72XX VTM (DTS) binding
> >  maintainers:
> >    - Keerthy <j-keerthy@...com>
> >  
> > +description: |
> > +  The TI K3 family of SoCs typically have a Voltage & Thermal
> > +  Management (VTM) device to control up to 8 temperature diode
> > +  sensors to measure silicon junction temperatures from different
> > +  hotspots of the chip as well as provide temperature, interrupt
> > +  and alerting information.
> > +
> > +  The VTM device will periodically enable these temperature sensors
> > +  to make a temperature measurement and store the reported data
> > +  allowing the sensors to stay in a reset state when not in use
> > +  to maximize the sensor's life.
> > +
> > +  This VTM driver will then use the following polynomial equation to
> 
> "VTM driver" is some physical/electronic element called driver? Or Linux
> driver? If the latter, drop it and just describe the equation.

Yeah I was trying to talk about the Linux driver. I'll edit it to only 
the equation. 

> 
> > +  calculate the temperature from the value stored in the VTM device.
> > +
> > +  Temp = (-9.2627e-12) * x^4 + (6.0373e-08) * x^3 + \
> > +         (-1.7058e-04) * x^2 + (3.2512e-01) * x   + (-4.9003e+01)
> > +
> >  properties:
> >    compatible:
> >      enum:
> > @@ -19,9 +37,16 @@ properties:
> >      items:
> >        - description: VTM cfg1 register space
> >        - description: VTM cfg2 register space
> > -      - description: VTM efuse register space
> > +      - description: |
> > +          A software trimming method must be applied to some Jacinto
> > +          devices to function properly. This eFuse region provides
> > +          the information needed for these SoCs to report
> > +          temperatures accurately.
> >  
> >    power-domains:
> > +    description: |
> > +      Should contain the phandle to a power management (PM) domain
> > +      node and the device-id of this device.
> 
> This is quite generic - why adding it?

This was really a "while I'm here" addition. But there is no need, I can 
drop this

Thanks again Krzysztof
~Bryan