linux-kernel - Re: [PATCH 1/2] dt-bindings: hwmon: Introduce ADS71x8

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Message-ID: <766b9892-ef54-4f0a-96dd-19e8a1b3279c@roeck-us.net>
Date: Fri, 30 Aug 2024 07:30:16 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Conor Dooley <conor@...nel.org>,
 "Sperling, Tobias" <Tobias.Sperling@...ting.com>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>,
 "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
 "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
 "jdelvare@...e.com" <jdelvare@...e.com>, "robh@...nel.org"
 <robh@...nel.org>, "krzk+dt@...nel.org" <krzk+dt@...nel.org>,
 "conor+dt@...nel.org" <conor+dt@...nel.org>, "corbet@....net"
 <corbet@....net>, Jonathan Cameron <jic23@...nel.org>,
 linux-iio@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: hwmon: Introduce ADS71x8

On 8/30/24 06:14, Conor Dooley wrote:
> Hey Tobias, Guenter, Jonathan,
> 
> On Fri, Aug 30, 2024 at 11:49:53AM +0000, Sperling, Tobias wrote:
>>  From b2e04ce5500faf274654be5284be9db4f3abefce Mon Sep 17 00:00:00 2001
>> From: Tobias Sperling <tobias.sperling@...ting.com>
>> Date: Fri, 23 Aug 2024 12:08:33 +0200
>> Subject: [PATCH 1/2] dt-bindings: hwmon: Introduce ADS71x8
>>
>> Add documentation for the driver of ADS7128 and ADS7138 12-bit, 8-channel
>> analog-to-digital converters. These ADCs have a wide operating range and
>> a wide feature set. Communication is based on an I2C interface.
>> The driver provides the functionality of manually reading single channels
>> or sequentially reading all channels automatically.
>>
>> Signed-off-by: Tobias Sperling <tobias.sperling@...ting.com>
>> ---
>>   .../devicetree/bindings/hwmon/ti,ads71x8.yaml |  85 +++++++++++
> 
> If this is a "generic" adc, why is it going into hwmon?
> I would have expected this to be in iio/adc, and use more typical adc
> bindings, even if the driver is in hwmon.
> 
> Guenter/Jonathan wdyt?
> 

Same thought here. While the chip supports limits, making it suitable for
hardware monitoring, its primary use seems to be as ADC, not as hardware
monitoring device. The hardware monitoring API isn't well suited for the
fast sample rate supported by this chip.

Guenter