linux-kernel - Re: [PATCH 2/3] pinctrl: Device tree bindings for Qualcomm pm8xxx gpio block

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Date:	Mon, 14 Jul 2014 16:24:56 +0300
From:	"Ivan T. Ivanov" <iivanov@...sol.com>
To:	Bjorn Andersson <bjorn@...o.se>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	Bjorn Andersson <bjorn.andersson@...ymobile.com>,
	Rob Herring <robh+dt@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 2/3] pinctrl: Device tree bindings for Qualcomm pm8xxx
 gpio block

On Wed, 2014-07-09 at 14:18 -0700, Bjorn Andersson wrote:
> On Wed, Jul 9, 2014 at 1:53 AM, Linus Walleij <linus.walleij@...aro.org> wrote:
> > On Tue, Jul 8, 2014 at 3:26 AM, Bjorn Andersson
> > <bjorn.andersson@...ymobile.com> wrote:


> [...]
> >> +
> >> +       pm8921_gpio: gpio@150 {
> >> +               compatible = "qcom,pm8921-gpio";
> >> +               reg = <0x150>;
> >> +               interrupts = <192 1>, <193 1>, <194 1>,
> >> +                            <195 1>, <196 1>, <197 1>,
> >> +                            <198 1>, <199 1>, <200 1>,
> >> +                            <201 1>, <202 1>, <203 1>,
> >> +                            <204 1>, <205 1>, <206 1>,
> >> +                            <207 1>, <208 1>, <209 1>,
> >> +                            <210 1>, <211 1>, <212 1>,
> >> +                            <213 1>, <214 1>, <215 1>,
> >> +                            <216 1>, <217 1>, <218 1>,
> >> +                            <219 1>, <220 1>, <221 1>,
> >> +                            <222 1>, <223 1>, <224 1>,
> >> +                            <225 1>, <226 1>, <227 1>,
> >> +                            <228 1>, <229 1>, <230 1>,
> >> +                            <231 1>, <232 1>, <233 1>,
> >> +                            <234 1>, <235 1>;
> >
> >
> > So this looks a bit weird. But if I just get to understand the hardware
> > I guess it won't anymore.
> >
> > So there is an interrupt parent to which the IRQ lines from the PMIC
> > are routed back through external lines to IRQ offsets 192 thru 235?
> >
> 
> The pm8921-core exposes 256 interrupts, the listed 44 interrupts here are what
> comes out of that.
> 
> I was really reluctant to list all the interrupts, but I think it turned out
> nicer than any of my other attempts; like only providing a base and then
> relying on interrupts being consecutive.
> 
> Suggestions on how this "should" be solved are welcome, as we have the same
> setup for the newer pmics (Ivan's patches) and the TLMM hardware (pinctrl-msm)
> supports using dedicated interrupts for certain gpio pins (instead of passing
> through the chain handler).

This is something that is already known in the driver, numbers did not
change at run time, right? Could we hard-code IRQ base in driver, like 
"ti,palmas-gpio" did? reg property is also not strictly required, but
this is different story :-).

Regards,
Ivan

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