linux-kernel - Re: [PATCH 2/2] hwmon: Aspeed AST2400/AST2500 ADC

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Message-ID: <adbb9c99-d4dc-d5d7-2f44-be835aa51f0a@roeck-us.net>
Date:   Sun, 5 Mar 2017 08:14:57 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Rob Herring <robh@...nel.org>
Cc:     Joel Stanley <joel@....id.au>, Rick Altherr <raltherr@...gle.com>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, jdelvare@...e.com,
        linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] hwmon: Aspeed AST2400/AST2500 ADC

On 03/02/2017 10:21 PM, Rob Herring wrote:
> On Tue, Feb 28, 2017 at 07:45:23PM -0800, Guenter Roeck wrote:
>> On 02/28/2017 04:49 PM, Joel Stanley wrote:
>>> On Wed, Mar 1, 2017 at 6:44 AM, Rick Altherr <raltherr@...gle.com> wrote:
>>>> Aspeed AST2400/AST2500 BMC SoCs include a 16 channel, 10-bit ADC. This
>>>> driver implements reading the ADC values, enabling channels via device
>>>> tree, and optionally providing channel labels via device tree.  Low and
>>>> high threshold interrupts are supported by the hardware but not
>>>> implemented.
>>>>
>>>> Signed-off-by: Rick Altherr <raltherr@...gle.com>
>>>
>>> Looks good. Some minor comments below.
>>>
>>> Is there a reason you wrote a hwmon driver instead of an iio driver? I
>>> wasn't sure what the recommended subsystem is.
>>
>> Excellent point. Question is really if there is a plan to add support for
>> thresholds. If not, an iio driver might be more appropriate.
>
> Sigh. We have ADCs in 2 places? Fine for the kernel I guess, but not
> bindings.
>

Almost every {voltage, current, power, temperature} sensor chip is implemented
as ADC. Given that, we have (at least) three places. hwmon, iio, thermal.

Guenter