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

[Guenter Roeck]

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@xxxxxxxxxx> 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@xxxxxxxxxx>
> > >
> > > 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