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

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Date:	Wed, 08 Oct 2014 12:50:07 +0300
From:	"Ivan T. Ivanov" <iivanov@...sol.com>
To:	Bjorn Andersson <bjorn.andersson@...ymobile.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 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:
> > > These patches add dt bindings and a device driver for the power key block in
> > > the Qualcomm PM8941 pmic.
> > > 
> > > Courtney Cavin (2):
> > >   input: Add Qualcomm PM8941 power key driver
> > >   input: pm8941-pwrkey: Add DT binding documentation
> > > 
> > >  .../bindings/input/qcom,pm8941-pwrkey.txt          |   43 +++++
> > >  drivers/input/misc/Kconfig                         |   12 ++
> > >  drivers/input/misc/Makefile                        |    1 +
> > >  drivers/input/misc/pm8941-pwrkey.c                 |  196 ++++++++++++++++++++
> > >  4 files changed, 252 insertions(+)
> > >  create mode 100644 Documentation/devicetree/bindings/input/qcom,pm8941-pwrkey.txt
> > >  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.

> The pm8xxx block have separate
> interrupts for press and release events while pm8941 have one interrupt for
> both, so the pm8941 must read out the irq status bits to figure out which event
> it was.

Optional interrupt property? If both are defined hook old ISR, if its
only one hook pm8941 ISR?

> 
> 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?

Regards,
Ivan

> Regards,
> Bjorn


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