linux-kernel - Re: [PATCH v7 03/10] iio: adc: add helpers for parsing ADC nodes

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Message-ID: <66a93de8-f5a2-4ffd-9c97-c646934cc90d@gmail.com>
Date: Mon, 17 Mar 2025 10:22:11 +0200
From: Matti Vaittinen <mazziesaccount@...il.com>
To: Jonathan Cameron <jic23@...nel.org>
Cc: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
 Lars-Peter Clausen <lars@...afoo.de>,
 Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
 Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
 Chen-Yu Tsai <wens@...e.org>, Jernej Skrabec <jernej.skrabec@...il.com>,
 Samuel Holland <samuel@...lland.org>,
 Hugo Villeneuve <hvilleneuve@...onoff.com>, Nuno Sa <nuno.sa@...log.com>,
 David Lechner <dlechner@...libre.com>,
 Javier Carrasco <javier.carrasco.cruz@...il.com>,
 Guillaume Stols <gstols@...libre.com>,
 Dumitru Ceclan <mitrutzceclan@...il.com>,
 Trevor Gamblin <tgamblin@...libre.com>,
 Matteo Martelli <matteomartelli3@...il.com>,
 Alisa-Dariana Roman <alisadariana@...il.com>,
 Ramona Alexandra Nechita <ramona.nechita@...log.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
 linux-renesas-soc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH v7 03/10] iio: adc: add helpers for parsing ADC nodes

On 16/03/2025 11:38, Jonathan Cameron wrote:
> On Thu, 13 Mar 2025 09:18:18 +0200
> Matti Vaittinen <mazziesaccount@...il.com> wrote:
> 
>> There are ADC ICs which may have some of the AIN pins usable for other
>> functions. These ICs may have some of the AIN pins wired so that they
>> should not be used for ADC.
>>
>> (Preferred?) way for marking pins which can be used as ADC inputs is to
>> add corresponding channels@N nodes in the device tree as described in
>> the ADC binding yaml.
>>
>> Add couple of helper functions which can be used to retrieve the channel
>> information from the device node.
> I suspect we'll need the addition of an optional trailing timestamp
> channel at somepoint. But we can add that when we need it as only
> matters for drivers doing iio_push_to_buffers_with_timestamp()

This is true. That'll enable using this for devices with buffers - which 
is not possible right now as most buffer users do timestamps. I'll leave 
adding the parameter to first buffered user though, but I think it's 
good to say out loud this is doable :) Thanks!

> Otherwise no additional comments from me.

Yours,
	-- Matti