Re: [PATCH 1/3] mfd: tps65090: Allow charger module to be used when no irq

[Doug Anderson]

Lee

On Wed, Apr 16, 2014 at 2:52 AM, Lee Jones <lee.jones@xxxxxxxxxx> wrote:
>> On the ARM Chromebook tps65090 has two masters: the AP (the main
>> processor running linux) and the EC (the embedded controller).  The AP
>> is allowed to mess with FETs but the EC is in charge of charge control.
>>
>> The tps65090 interupt line is routed to both the AP and the EC, which
>> can cause quite a headache.  Having two people adjusting masks and
>> acking interrupts is a recipe for disaster.
>>
>> In the shipping kernel we had a hack to have the AP pay attention to
>> the IRQ but not to ack it.  It also wasn't supposed to configure the
>> IRQ in any way.  That hack allowed us to detect when the device was
>> charging without messing with the EC's state.
>>
>> The current tps65090 infrastructure makes the above difficult, and it
>> was a bit of a hack to begin with.  Rather than uglify the driver to
>> support it, just extend the driver's existing notion of "no irq" to
>> the charger.  This makes the charger code poll every 2 seconds for AC
>> detect, which is sufficient.
>>
>> Signed-off-by: Doug Anderson <dianders@xxxxxxxxxxxx>
>> ---
>>  drivers/mfd/tps65090.c           | 14 ++++++--
>>  drivers/power/tps65090-charger.c | 76 +++++++++++++++++++++++++++++++---------
>>  2 files changed, 70 insertions(+), 20 deletions(-)
>
> For the MFD part:
>   Acked-by: Lee Jones <lee.jones@xxxxxxxxxx>
>
> Anton,
>   If you are okay with this patch I'd be happy to create an immutable
> branch for you to pull from?
>
> Doug,
>   What is the relationship (dependencies) between this and the other
> patches in the set?

This patch can be applied irrespective of other others in the series.

-Doug
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