Re: [RFC v2 08/11] gpiolib: cdev: Add hardware timestamp clock type

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

On Fri, Oct 1, 2021 at 1:26 AM Dipen Patel <dipenp@xxxxxxxxxx> wrote:

> This patch adds new clock type for the GPIO controller which can
> timestamp gpio lines in realtime using hardware means. To expose such
> functionalities to the userspace, code has been added in this patch
> where during line create call, it checks for new clock type and if
> requested, calls hardware timestamp related API from gpiolib.c.
> During line change event, the HTE subsystem pushes timestamp data
> through callbacks.
>
> Signed-off-by: Dipen Patel <dipenp@xxxxxxxxxx>
> ---
> Changes in v2:
> - Added hte_dir and static structure hte_ts_desc.
> - Added callbacks which get invoked by HTE when new data is available.
> - Better use of hte_dir and seq from hte_ts_desc.
> - Modified sw debounce function to accommodate hardware timestamping.

This looks pretty much like I imagined it would, good work!
I am a bit busy now and unable to do an in-depth review
(brain parse the code and make sure all is sane) but it looks
really good, so at least I can say:
Acked-by: Linus Walleij <linus.walleij@xxxxxxxxxx>

Yours,
Linus Walleij