Re: [PATCH 5/5] staging: iio: ad9832: add sysfs documentation

From: Marcelo Schmitt

Date: Thu Dec 18 2025 - 10:08:40 EST


On 12/15, Tomas Borquez wrote:
> Add sysfs ABI documentation for the AD9832/AD9835 Direct Digital
> Synthesizer chips, documenting frequency, phase, output control,
> and pin control attributes.
>
> Signed-off-by: Tomas Borquez <tomasborquez13@xxxxxxxxx>
> ---
> .../Documentation/sysfs-bus-iio-dds-ad9832 | 41 +++++++++++++++++++
> 1 file changed, 41 insertions(+)
> create mode 100644 drivers/staging/iio/Documentation/sysfs-bus-iio-dds-ad9832
>
> diff --git a/drivers/staging/iio/Documentation/sysfs-bus-iio-dds-ad9832 b/drivers/staging/iio/Documentation/sysfs-bus-iio-dds-ad9832
> new file mode 100644
> index 0000000000..5ceea57917
> --- /dev/null
> +++ b/drivers/staging/iio/Documentation/sysfs-bus-iio-dds-ad9832
> @@ -0,0 +1,41 @@
> +What: /sys/bus/iio/devices/iio:deviceX/out_altcurrent0_frequencyY
To be more generic, I think we could use a capital letter for the channel number
too and avoid the symbol postfix in the this attribute's name.
+What: /sys/bus/iio/devices/iio:deviceX/out_altcurrentY_frequency

> +KernelVersion: 6.19
> +Contact: linux-iio@xxxxxxxxxxxxxxx
> +Description:
> + Frequency in Hz for frequency register Y (0-1). The active
> + frequency register is selected via out_altcurrent0_frequency_symbol.
Maybe, if we can keep only the 'Frequency in Hz for frequency channel Y.' part
of the description, this is something that could actually go into sysfs-bus-iio
when the driver graduates. Though, the 'register is selected via
out_altcurrent0_frequency_symbol' part is trickier since it seems to be design
specific.

What if we do something like
+What: /sys/bus/iio/devices/iio:deviceX/out_altcurrentY_frequency_symbolZ
+KernelVersion: 6.19
+Contact: linux-iio@xxxxxxxxxxxxxxx
+Description:
+ Frequency in Hz for symbol Z of frequency Y channel. The active
+ frequency symbol is selected via out_altcurrentY_frequency_symbol.
?

Same thoughts about out_altcurrent0_phaseY.