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

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Date:	Wed, 16 Apr 2014 08:42:59 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	Anton Vorontsov <anton@...msg.org>,
	Olof Johansson <olof@...om.net>,
	Sachin Kamat <sachin.kamat@...aro.org>,
	AJAY KUMAR RAMAKRISHNA SHYMALAMMA <ajaykumar.rs@...sung.com>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] mfd: tps65090: Allow charger module to be used when
 no irq

Lee

On Wed, Apr 16, 2014 at 2:52 AM, Lee Jones <lee.jones@...aro.org> 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@...omium.org>
>> ---
>>  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@...aro.org>
>
> 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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