linux-kernel - Re: [PATCH 0/2] Qualcomm PM8941 power key driver

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Date:	Fri, 24 Oct 2014 08:23:51 -0700
From:	Bjorn Andersson <bjorn.andersson@...ymobile.com>
To:	"Ivan T. Ivanov" <iivanov@...sol.com>
CC:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Grant Likely <grant.likely@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH 0/2] Qualcomm PM8941 power key driver

On Wed 08 Oct 02:50 PDT 2014, Ivan T. Ivanov wrote:

> On Tue, 2014-10-07 at 11:46 -0700, Bjorn Andersson wrote:
> > On Tue 07 Oct 02:01 PDT 2014, Ivan T. Ivanov wrote:
> > 
> > > 
> > > Hi Bjorn,
> > > 
> > > On Mon, 2014-10-06 at 18:11 -0700, Bjorn Andersson wrote:
[..]
> > > >  create mode 100644 drivers/input/misc/pm8941-pwrkey.c
> > > 
> > > Any reason why we cannot reuse pm8xxx-pwrkey driver? It have been
> > > converted to regmap already. 
> > > 
> > 
> > The boilerplate code is the same,
> 
> The boilerplate code is almost 100% :-)
> 
> >  but configuration registers have different
> > layout and values written in them are different. 
> 
> We talk about 3 registers and 2 bit defines. struct regmap_field
> should be able to help here.
> 

You're totally right, we could rewrite the driver to use regmap_field and make
the rest of the differences conditional. In my eyes we end up with two drivers
in one file - but it can be done.

A difference however is that in pm8941 the ps hold behavious (reboot vs power
off) is controlled by this same block. So I have an additional patch that adds
a restart handler here that sets the pmic in the right state before we pull
pshold (but I haven't been able to test it properly).

In pm8xxx this is handled in the pmic misc block and does not belong in this
driver.

[..]
> > 
> > Maybe if we introduce some vagueness related to interrupts in the dt binding
> > documentation for pm8xxx we could simply reuse that binding.
> > 
> 
> I would not say vagueness, we just can say that pm8941 did not have
> second interrupt?
> 

I don't like having conditional documentation - it's not only that the second
interrupt is missing, the first one have different meaning. But you're right
that it's a minor thing and can be done.

Regards,
Bjorn
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