Kmod driver at iicbus. attach() and config_intrhook(9)

[Michal Meloun]

On 25.08.2020 22:33, John-Mark Gurney wrote:
> Andriy Gapon wrote this message on Tue, Aug 25, 2020 at 10:21 +0300:
>> On 24/08/2020 23:47, John-Mark Gurney wrote:
>>> What driver is used for i2c on the Orange?  I've tried to firgure it
>>> out from dts + source, but it isn't clear.
>>
>> a10_twsi
> 
> Thanks.  And this explains why I couldn't find it in arm/allwinner.. :)
> 
> Yeah, this is using bus_generic_attach...
> 
> But it looks like it supports interruptless operation.  Is there a flag
> for when interrupts are enabled?
> 
> Because the check in sys/dev/iicbus/twsi/twsi.c:twsi_transfer could be
> changed from:
>         if (sc->have_intr == false)
> 
> to:
>         if (sc->have_intr == false || interrupts_not_enabled)
> 
> And that could fix things.

See one of existing drivers for inspiration.
For example:
https://svnweb.freebsd.org/base/head/sys/arm64/rockchip/rk_i2c.c?revision=358278&view=markup&pathrev=364777#l528

Michal