Re: [PATCH v2] iio: humidity: am2315: add am2320 to i2c_device_id table

[Jonathan Cameron <jic23@kernel.org>]

On Tue, 11 Aug 2026 13:06:50 -0500
David Lechner <dlechner@baylibre.com> wrote:

> On 8/11/26 12:58 PM, Nicolás Antinori wrote:
> > On Tue Aug 11, 2026 at 12:49 PM -03, David Lechner wrote:  
> >> On 8/11/26 10:12 AM, Nicolás Antinori wrote:  
> >>> On Mon Aug 10, 2026 at 4:28 PM -03, David Lechner wrote:  
> >>>> On 8/10/26 1:32 PM, Nicolás Antinori wrote:  
> >>>>> The AM2320 is fully compatible with the AM2315 sensor in terms of I2C
> >>>>> communication protocol and measurement conversions.
> >>>>>
> >>>>> Add the "am2320" entry to the i2c_device_id table.  
> >>>>
> >>>> Interesting. No devicetree bindings for this one? What kind of
> >>>> system is it on?
> >>>>  
> >>>
> >>> I am testing this on a Raspberry Pi 3b mounted on a protoboard.  
> >>
> >> How do you tell the RPi to bind the driver?
> >>
> >> Since Raspberry Pi is ARM-based, usually we would use devicetree
> >> overlay to do this, which would mean that we should write a
> >> dt-bindings .yaml file for these chips.  
> > 
> > I do it manually.
> > 
> > I use that RPi for development, at the moment the kernel I am using is 
> > 7.2.0-rc6-v8+ with CONFIG_AM2315=m. When I need to use the AM2320 I
> > modprobe it with:
> > 
> > $ sudo modprobe am2315
> > 
> > And then 
> > 
> > $ sudo bash -c "echo am2315 0x5c > /sys/bus/i2c/devices/i2c-1/new_device"
> > 
> > (With the modifications I made ... echo am2320 ... works as well)
> > The pins for i2c I am using are GPIO 2 (SDA) and GPIO 3 (SCL).
> > 
> > If a dt-binding yaml is needed I can send another patch with it!
> > 
> >   
> 
> Yes please. It will make it easier for others to use as well.

I think (from a quick bit of googling) that these two parts are
at least 'kind of' the same thing with different packaging.
The name is a nice to have and given the packaging may I guess
affect the signal and how it is used it probably makes sense
to add it.

They only have 4 pins. Power, ground, SCL and SDA.  So it
is a rare device simple enough that I think an entry in trivial-devices.yaml
is probably sufficient.

Ideally add an of_device_id table, even though this will work fine
by the fallback path that uses the i2c_device_id table

Jonathan

>