Aw: Re: Driver load order

Sascha Hauer sha at
Thu May 19 06:10:19 PDT 2022

On Thu, May 19, 2022 at 02:50:13PM +0200, Ahmad Fatoum wrote:
> On 19.05.22 14:43, Frank Wunderlich wrote:
> > @ahmad: thanks for your driver. Take a quick look into it...
> > 
> > it seems nearly complete, is there anything not working or was the only
> > problem the missing regmap-handling added in part1?
> IIRC, Linux just has regmap_i2c_init which does the correct thing for all
> callers. While in barebox this doesn't work and I had to add a smbus specific
> regmap_init. We can always consolidate this later though, so feel free to
> add whatever you find missing, test it and send it out for upstream
> inclusion. You have my Signed-off-by.
> > My current approach is only register the regulators without doing a real
> > pmic init. IO-Domain driver only needs to read out regulator voltage, i'm
> > not sure if it's enough to get the value from the DT or if it needs to be
> > really measured (to depend on complete probe/init of the pmic).
> > 
> > but the problem is that iodomain is probed before the pmic due to deep-probing
> > if i understand Sascha the right way. So i need a way to defer the iodomain driver
> > probe till rk808 is ready.
> The right way with deep probe enabled is to just use regulator functions
> normally and on first access, barebox will take care to probe the regulator
> if not done yet. I am not sure if all this works as expected yet, but Sascha
> already offered to help with that.

I gave it a test with your rk808 driver. It just works \o/

regulator_get() triggers probing of the rk808 regulator driver and
returns a valid regulator.


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