Re: [PATCH v6 5/7] iio: ABI: Add support for floating-point numbers in buffer scan elements

[David Lechner]

On 2/25/26 4:17 AM, Francesco Lavra wrote:
> In the data storage description of a scan element, the first character
> after the colon can have the values 's' and 'u' to specify signed and
> unsigned integers, respectively.
> Add 'f' as an allowed value to specify floating-point numbers formatted
> according to the IEEE 754 standard.
> 
> Signed-off-by: Francesco Lavra <flavra@xxxxxxxxxxxx>
> ---
>  Documentation/ABI/testing/sysfs-bus-iio  | 33 +++++++++++++-----------
>  Documentation/driver-api/iio/buffers.rst |  5 ++--
>  Documentation/iio/iio_devbuf.rst         |  3 ++-
>  3 files changed, 23 insertions(+), 18 deletions(-)
> 
> diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
> index 5f87dcee78f7..61961bca4dce 100644
> --- a/Documentation/ABI/testing/sysfs-bus-iio
> +++ b/Documentation/ABI/testing/sysfs-bus-iio
> @@ -1510,21 +1510,24 @@ Contact:	linux-iio@xxxxxxxxxxxxxxx
>  Description:
>  		Description of the scan element data storage within the buffer
>  		and hence the form in which it is read from user-space.
> -		Form is [be|le]:[s|u]bits/storagebits[>>shift].
> -		be or le specifies big or little endian. s or u specifies if
> -		signed (2's complement) or unsigned. bits is the number of bits
> -		of data and storagebits is the space (after padding) that it
> -		occupies in the buffer. shift if specified, is the shift that
> -		needs to be applied prior to masking out unused bits. Some
> -		devices put their data in the middle of the transferred elements
> -		with additional information on both sides.  Note that some
> -		devices will have additional information in the unused bits
> -		so to get a clean value, the bits value must be used to mask
> -		the buffer output value appropriately.  The storagebits value
> -		also specifies the data alignment.  So s48/64>>2 will be a
> -		signed 48 bit integer stored in a 64 bit location aligned to
> -		a 64 bit boundary. To obtain the clean value, shift right 2
> -		and apply a mask to zero the top 16 bits of the result.
> +		Form is [be|le]:[s|u|f]bits/storagebits[>>shift].

Not related to this patch, but I notice that this is missing "repeat".
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