linux-kernel - Re: [PATCH 0/4] New Qualcomm PMIC pin controller drivers

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Date:	Wed, 09 Jul 2014 14:13:00 +0300
From:	"Ivan T. Ivanov" <iivanov@...sol.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Bjorn Andersson <Bjorn.Andersson@...ymobile.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.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-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH 0/4] New Qualcomm PMIC pin controller drivers

Hi, 

On Wed, 2014-07-09 at 11:43 +0200, Linus Walleij wrote:
> On Mon, Jul 7, 2014 at 5:11 PM, Ivan T. Ivanov <iivanov@...sol.com> wrote:
> 
> > This set of patches adds pin control drivers for Multi-purpose
> > pin (MPP) and General-purpose pin (GPIO) controllers found
> > in Qualcomm PMIC chips.
> >
> > MPP's are enhanced GPIO's with analog circuits, which support
> > following functions in addition to digital input/output: analog
> > input/output and current sinks.
> >
> > PMIC PM8941 have 8 MPP's and 36 GPIO's. PMIC PM8841 have 4 MPP's.
> >
> > Ivan T. Ivanov (4):
> >   pinctrl: qpnp: Qualcomm PMIC pin controller driver
> >   pinctrl: qcom: Add documentation for pinctrl-qpnp binding
> >   pinctrl: qcom: Add PM8941 and PM8941 pinctrl drivers
> >   ARM: dts: qcom: Add PM8941 and PM8841 pinctrl nodes
> 
> Oh, I just spent some 45 minutes reviewing an 8xxx pinctrl driver from
> Björn Andersson
> that *seems* to be doing exactly the same thing.
> 
> Now I have two drivers from people outside Qualcomm :-)
> 
> Some of my review comments on Björn's driver (like using SI units with the pin
> config) are actually adressed in this patch set. The idea to split in subdrivers
> per-ASIC may be good? I don't really know.
> 
> Can you two guys *PLEASE* join efforts and combine your drivers into one?

Not sure. Björn patches cover older PMIC chips, if not mistaken, mine
cover PMIC's used with APQ8074 and onward [1]. Main difference is
the bus which connects them to SoC, interrupts handling, runtime
pin type detection and register map. 

Regards,
Ivan

[1] pm8019, pm8110, pm8226, pm8841, pm8916, pm8941, pm8994, pma8084, 
    pmd9635, pmd9635, pmi8962, pmi8994.

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