linux-kernel - Re: [PATCH v1 4/4] Documentation: iio: ad4000: Describe offload support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250317103012.0053bb42@jic23-huawei>
Date: Mon, 17 Mar 2025 10:30:12 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Marcelo Schmitt <marcelo.schmitt@...log.com>
Cc: <linux-iio@...r.kernel.org>, <linux-doc@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>, <lars@...afoo.de>,
 <Michael.Hennerich@...log.com>, <corbet@....net>,
 <marcelo.schmitt1@...il.com>
Subject: Re: [PATCH v1 4/4] Documentation: iio: ad4000: Describe offload
 support

On Fri, 14 Mar 2025 14:19:33 -0300
Marcelo Schmitt <marcelo.schmitt@...log.com> wrote:

> When SPI offloading is supported, the IIO device provides different sysfs
> interfaces to allow using the adjusting the sample rate. Document SPI
> offload support for AD4000 and similar devices.
> 
> Signed-off-by: Marcelo Schmitt <marcelo.schmitt@...log.com>
> ---
>  Documentation/iio/ad4000.rst | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> diff --git a/Documentation/iio/ad4000.rst b/Documentation/iio/ad4000.rst
> index 468d30dc9214..2d56b0762570 100644
> --- a/Documentation/iio/ad4000.rst
> +++ b/Documentation/iio/ad4000.rst
> @@ -191,3 +191,20 @@ Typical voltage channel attributes of a differential AD4000 series device:
>  +-------------------------------------------+------------------------------------------+
>  | ``in_voltage0-voltage1_scale_available``  | Toggles input span compression           |
>  +-------------------------------------------+------------------------------------------+
> +
> +SPI offload support
> +-------------------
> +
> +To be able to achieve the maximum sample rate, the driver can be used with the
> +`AXI SPI Engine`_ to provide SPI offload support.

Can we make this more generic?  
"the driver can be used with SPI offload engine, such as the ...

I'm rather hoping we see others in the long run as useful little things!
> +
> +.. _AXI SPI Engine: http://analogdevicesinc.github.io/hdl/projects/pulsar_adc/index.html
> +
> +When set for SPI offload support, the IIO device will provide different
> +interfaces.
> +
> +* Either ``in_voltage0_sampling_frequency`` or
> +  ``in_voltage0-voltage1_sampling_frequency`` file is provided to allow setting
> +  the sample rate.
> +* IIO trigger device is not provided (no ``trigger`` directory).
> +* ``timestamp`` channel is not provided.