Busybox hwclock implement set/get RTC params

[Primoz Fiser]

Hi all,

currently we have a use-case on embedded Linux machine to set/get RTC
clock params by using hwclock.
The support for those set/get RTC params ioctl()s was introduced in
mainline kernel v5.16 [1].

For example:

$ hwclock --param-set bsm=0x2

$ hwclock --param-get bsm

Since we are using busybox's hwclock implementation instead of
util-linux's, we of-course cannot do that on that specific machine.

We are also quite reluctant at the moment to switch to util-linux just
to cover this specific use-case.

On the other hand, util-linux got support for those set/get RTC params
ioctl()s with [2].


So the questions are:

1) Does anyone perhaps already work on hwclock supporting set/get RTC
params?

2) If we invest time implementing hwlock set/get RTC params, would you
be willing to accept it? We would like to avoid developing a solution
that won't be accepted into busybox upstream.

3) At this stage, looking at [2], do you see any potential issues when
trying to support hwclock set/get RTC params on Busybox?


Best regards,

Primoz


References:

[1]
https://lore.kernel.org/all/20211018151933.76865-1-alexandre.belloni@bootlin.com/

[2] https://github.com/util-linux/util-linux/pull/1570


-- 

Primoz Fiser                    | phone: +386-41-540-545 <tel:+386-41-390-545> |
---------------------------------------------------------|
Norik systems d.o.o.            | https://www.norik.com  |
Your embedded software partner  | email: info at norik.com  |
Slovenia, EU                    | phone: +386-41-540-545 <tel:+386-41-540-545> |
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