From: "Sabau, Radu bogdan" <Radu.Sabau@analog.com>
To: "David Lechner" <dlechner@baylibre.com>,
"Lars-Peter Clausen" <lars@metafoo.de>,
"Hennerich, Michael" <Michael.Hennerich@analog.com>,
"Jonathan Cameron" <jic23@kernel.org>,
"Sa, Nuno" <Nuno.Sa@analog.com>,
"Andy Shevchenko" <andy@kernel.org>,
"Rob Herring" <robh@kernel.org>,
"Krzysztof Kozlowski" <krzk+dt@kernel.org>,
"Conor Dooley" <conor+dt@kernel.org>,
"Uwe Kleine-König" <ukleinek@kernel.org>,
"Liam Girdwood" <lgirdwood@gmail.com>,
"Mark Brown" <broonie@kernel.org>,
"Linus Walleij" <linusw@kernel.org>,
"Bartosz Golaszewski" <brgl@kernel.org>,
"Philipp Zabel" <p.zabel@pengutronix.de>
Cc: "linux-iio@vger.kernel.org" <linux-iio@vger.kernel.org>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-pwm@vger.kernel.org" <linux-pwm@vger.kernel.org>,
"linux-gpio@vger.kernel.org" <linux-gpio@vger.kernel.org>
Subject: RE: [PATCH v3 1/4] dt-bindings: iio: adc: add bindings for AD4691 family
Date: Mon, 16 Mar 2026 15:47:18 +0000 [thread overview]
Message-ID: <LV9PR03MB84144709474363AF7BBD2BA0F740A@LV9PR03MB8414.namprd03.prod.outlook.com> (raw)
In-Reply-To: <04257601-5ea2-4cd8-8170-29decad13861@baylibre.com>
> -----Original Message-----
> From: David Lechner <dlechner@baylibre.com>
> Sent: Monday, March 16, 2026 5:14 PM
...
> > I agree with this, since only DATA_READY will be used anyway as an interrupt
> > in CNV_CLOCK mode.
> > In fact, I am now thinking of removing ADC_BUSY entirely, since its used in
> > just two cases, which none of them perhaps make sense :
> >
> > 1. Manual Mode,where ADC_BUSY is selected for GPx, though is not used as
> > an interrupt or 'feedback' of anyway.
> > 2. Autonomous Mode, where in theory it would be used to see when each
> > channel was sampled, but this mode is used for just once channel single
> > shot reading, so again, not actually used.
> >
> > The implementation would see the enum removed and just initializing
> > the GPx pin used as DATA READY using a macro.
> >
> > What are your thoughts on this?
>
>
> We should try to consider every reasonable possible wiring situation.
> The only case I can think where the devicetree might need to know the
> requested function in addition to which pin is if the pin is wired to
> something not controlled by Linux. That is an odd enough situation though
> that we could defer considering that. I think we could add support for such
> a thing later if we needed to without breaking the existing bindings.
>
> So hopefully I am thinking clearly enough about this to say, yes, we
> should just go with #trigger-source-cells = <1>; where the cell is the
> GP pin number.
>
I agree. This will be covered in the next version then.
> >
> >>
> >>> + - Second cell: GPIO pin number (only 0 = GP0 is supported)
...
> >
> > In this example, I would say this is needed since the CNV PWM is
> > not only starting the conversion on the ADC, but also controlling
> > the sampling rate, making custom sampling rates available in
> > comparison to the internal oscillator used by AUTONOMOUS.
>
> The point was to have an example that shows SPI offload usage.
> I assume this would be more common that PWM without SPI offload.
>
Indeed, this mode would be more commonly used with offload. However
the PWM would also be used although offload is not.
> >
> >>> +
> >>> + interrupts = <12 4>;
> >
> > Best Regards,
> > Radu
next prev parent reply other threads:[~2026-03-16 15:47 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-13 10:07 [PATCH v3 0/4] iio: adc: ad4691: add driver for AD4691 multichannel SAR ADC family Radu Sabau via B4 Relay
2026-03-13 10:07 ` [PATCH v3 1/4] dt-bindings: iio: adc: add bindings for AD4691 family Radu Sabau via B4 Relay
2026-03-14 9:41 ` Krzysztof Kozlowski
2026-03-16 11:55 ` Sabau, Radu bogdan
2026-03-14 15:29 ` David Lechner
2026-03-14 16:19 ` David Lechner
2026-03-16 12:39 ` Sabau, Radu bogdan
2026-03-16 12:55 ` Sabau, Radu bogdan
2026-03-16 15:14 ` David Lechner
2026-03-16 15:47 ` Sabau, Radu bogdan [this message]
2026-03-14 18:18 ` David Lechner
2026-03-13 10:07 ` [PATCH v3 2/4] iio: adc: ad4691: add initial driver " Radu Sabau via B4 Relay
2026-03-13 10:58 ` Andy Shevchenko
2026-03-16 15:29 ` Sabau, Radu bogdan
2026-03-16 15:51 ` David Lechner
2026-03-16 15:57 ` Sabau, Radu bogdan
2026-03-16 16:13 ` Andy Shevchenko
2026-03-14 11:04 ` Nuno Sá
2026-03-16 14:29 ` Sabau, Radu bogdan
2026-03-16 16:00 ` Sabau, Radu bogdan
2026-03-14 16:36 ` David Lechner
2026-03-16 13:01 ` Sabau, Radu bogdan
2026-03-25 15:01 ` kernel test robot
2026-03-13 10:07 ` [PATCH v3 3/4] iio: adc: ad4691: add triggered buffer support Radu Sabau via B4 Relay
2026-03-13 11:13 ` Andy Shevchenko
2026-03-13 12:09 ` Sabau, Radu bogdan
2026-03-13 14:40 ` Andy Shevchenko
2026-03-14 18:37 ` David Lechner
2026-03-16 13:22 ` Sabau, Radu bogdan
2026-03-16 15:37 ` David Lechner
2026-03-16 15:56 ` Sabau, Radu bogdan
2026-03-16 16:44 ` David Lechner
2026-03-17 9:27 ` Sabau, Radu bogdan
2026-03-13 10:07 ` [PATCH v3 4/4] iio: adc: ad4691: add SPI offload support Radu Sabau via B4 Relay
2026-03-14 19:37 ` David Lechner
2026-03-16 13:31 ` Sabau, Radu bogdan
2026-03-13 11:14 ` [PATCH v3 0/4] iio: adc: ad4691: add driver for AD4691 multichannel SAR ADC family Andy Shevchenko
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