linux-kernel - Re: [PATCH v2 1/2] iio: adc: ad4695: add offload-based oversampling support

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Message-ID: <20250112153159.5169b164@jic23-huawei>
Date: Sun, 12 Jan 2025 15:31:59 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Trevor Gamblin <tgamblin@...libre.com>
Cc: Michael Hennerich <michael.hennerich@...log.com>, Nuno Sá
 <nuno.sa@...log.com>, David Lechner <dlechner@...libre.com>, Lars-Peter
 Clausen <lars@...afoo.de>, Jonathan Corbet <corbet@....net>,
 linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-doc@...r.kernel.org
Subject: Re: [PATCH v2 1/2] iio: adc: ad4695: add offload-based oversampling
 support

On Thu, 09 Jan 2025 13:47:23 -0500
Trevor Gamblin <tgamblin@...libre.com> wrote:

> Add support for the ad4695's oversampling feature when SPI offload is
> available. This allows the ad4695 to set oversampling ratios on a
> per-channel basis, raising the effective-number-of-bits from 16
> (OSR == 1) to 17 (4), 18 (16), or 19 (64) for a given sample (i.e. one
> full cycle through the auto-sequencer). The logic for reading and
> writing sampling frequency for a given channel is also adjusted based on
> the current oversampling ratio.
> 
> The non-offload case isn't supported as there isn't a good way to
> trigger the CNV pin in this mode. Support could be added in the future
> if a use-case arises.
> 
> Signed-off-by: Trevor Gamblin <tgamblin@...libre.com>
LGTM
Assuming no requests for changes otherwise feel free to poke me when
the dependency is available upstream. I'll keep it live in patchwork
but I tend only to loop back over outstanding stuff once or twice a cycle
and maybe that will be long after needed for this one!

Jonathan