linux-kernel - Re: [PATCH v3 3/3] hwmon: Add Baikal-T1 PVT sensor driver

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Message-ID: <20200527165205.5krrdahiup3i2oq3@mobilestation>
Date:   Wed, 27 May 2020 19:52:05 +0300
From:   Serge Semin <Sergey.Semin@...kalelectronics.ru>
To:     Guenter Roeck <linux@...ck-us.net>
CC:     Serge Semin <fancer.lancer@...il.com>,
        Jean Delvare <jdelvare@...e.com>,
        Jonathan Corbet <corbet@....net>,
        Maxim Kaurkin <maxim.kaurkin@...kalelectronics.ru>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Arnd Bergmann <arnd@...db.de>,
        Rob Herring <robh+dt@...nel.org>, <linux-mips@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-hwmon@...r.kernel.org>,
        <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 3/3] hwmon: Add Baikal-T1 PVT sensor driver

On Wed, May 27, 2020 at 09:25:49AM -0700, Guenter Roeck wrote:
> On Tue, May 26, 2020 at 04:38:23PM +0300, Serge Semin wrote:

[nip]

> > +
> > +=============================== ======= =======================================
> > +Name				Perm	Description
> > +=============================== ======= =======================================
> > +update_interval			RW	Measurements update interval per
> > +					sensor.
> > +temp1_type			RO	Sensor type (always 1 as CPU embedded
> > +					diode).
> > +temp1_label			RO	CPU Core Temperature sensor.
> > +temp1_input			RO	Measured temperature in millidegree
> > +					Celsius.
> > +temp1_min			RW	Low limit for temp input.
> > +temp1_max			RW	High limit for temp input.
> > +temp1_min_alarm			RO	Temperature input alarm. Returns 1 if
> > +					temperature input went below min limit,
> > +					0 otherwise.
> > +temp1_max_alarm			RO	Temperature input alarm. Returns 1 if
> > +					temperature input went above max limit,
> > +					0 otherwise.
> > +temp1_trim			RW	Temperature sensor trimming factor in
> > +					millidegree Celsius. It can be used to
> > +					manually adjust the temperature
> > +					measurements within 7.130 degrees
> > +					Celsius.
> 
> vs. standard ABI:
> 
> temp[1-*]_offset`
>                 Temperature offset which is added to the temperature reading
>                 by the chip.
> 
>                 Unit: millidegree Celsius
> 
> If you really think this is necessary, why not use the standard ABI ?

That would have made much more sense.) I'll replace the handwritten temp1_trim
with the standard temp1_offset attribute in v4 shortly today. Thanks for pointing
this out.

-Sergey

> 
> Guenter