linux-kernel - Re: [PATCH RESEND v2 1/4] pinctrl: Update Qualcomm pm8xxx GPIO parameters definitions

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Date:	Thu, 24 Jul 2014 17:40:10 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Stephen Boyd <sboyd@...eaurora.org>
Cc:	Bjorn Andersson <bjorn.andersson@...ymobile.com>,
	"Ivan T. Ivanov" <iivanov@...sol.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>,
	Mark Brown <broonie@...nel.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 RESEND v2 1/4] pinctrl: Update Qualcomm pm8xxx GPIO
 parameters definitions

On Thu, Jul 24, 2014 at 1:47 AM, Stephen Boyd <sboyd@...eaurora.org> wrote:

>> Please add these constants to the table of valid power-source values and use
>> something like I did to translate them to register values - it makes the DT
>> much more readable.
>
> The DT could be similarly readable if we had a bunch of #defines for the
> different VIN settings that resolved to the final register value for
> that pmic. Something like PM8921_GPIO1_14_VPH, PM8921_GPIO19_36_VPH,
> etc. There would be a lot of them, but then the driver could be really
> simple and just jam whatever value is in the DT into the register
> without having to bounce through a mapping table in software to figure
> out the register value. If we did this for the functions also then I
> believe we achieve readability without requiring a bunch of drivers for
> each and every single pmic?

Not sure but it sounds like you want to make the device tree a jam table,
(know about individual register offsets, sequences etc). That has been
throrougly NACKed in the past, because DT is not Open Firmware.

The exception is pinctrl-single which is restricted to single register
per pin use cases and is still a point of contention...

Yours,
Linus Walleij
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