Date: Fri, 29 Nov 2019 09:23:31 -0700 From: Ian Lepore <ian@freebsd.org> To: Emmanuel Vadot <manu@bidouilliste.com>, Nick Kostirya <nikolay.kostirya@i11.co> Cc: Milan Obuch <milan@obuch.sk>, freebsd-arm@freebsd.org Subject: Re: gpioiic FDT overlays for sun8i-h3 Message-ID: <0ce78262af1dd3b404b9a85a780933d7e11f008e.camel@freebsd.org> In-Reply-To: <20191129150944.67a2b723a6724c46f7559f96@bidouilliste.com> References: <20191128152901.39dbeb4d@thinkpad> <20191128062149.577be86eb7dc15ae5805f31a@bidouilliste.com> <20191129153754.28fb5763@thinkpad> <20191129144316.739c8664@zeta.dino.sk> <20191129155431.05d4e14f@thinkpad> <20191129150944.67a2b723a6724c46f7559f96@bidouilliste.com>
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On Fri, 2019-11-29 at 15:09 +0100, Emmanuel Vadot wrote:
> On Fri, 29 Nov 2019 15:54:31 +0200
> Nick Kostirya <nikolay.kostirya@i11.co> wrote:
>
> > From: Nick Kostirya <nikolay.kostirya@i11.co>
> > To: Milan Obuch <milan@obuch.sk>
> > Subject: Re: gpioiic FDT overlays for sun8i-h3
> > Date: Fri, 29 Nov 2019 15:53:05 +0200
> > X-Mailer: Claws Mail 3.17.4 (GTK+ 2.24.32; i386-portbld-freebsd12.0)
> >
> > On Fri, 29 Nov 2019 14:43:16 +0100
> > Milan Obuch <milan@obuch.sk> wrote:
> >
> > > On Fri, 29 Nov 2019 15:37:54 +0200
> > > Nick Kostirya via freebsd-arm <freebsd-arm@freebsd.org> wrote:
> > >
> > > > On Thu, 28 Nov 2019 06:21:49 +0100
> > > > Emmanuel Vadot <manu@bidouilliste.com> wrote:
> > > >
> > > > > Try this but I haven't even compiled it :
> > > > >
> > > > > /dts-v1/;
> > > > > /plugin/;
> > > > >
> > > > > / {
> > > > > compatible = "allwinner,sun8i-h3";
> > > > > };
> > > > >
> > > > > &{/soc/pinctrl@1c20800} {
> > > > > gpioiic0 {
> > > > > compatible = "gpioiic";
> > > > > scl = <0>; /* GPIO pin 00 (PA0) */
> > > > > sda = <2>; /* GPIO pin 02 (PA2) */
> > > > >
> > > > > };
> > > > > };
> > > >
> > > > Maybe I must rebuild all u-boot with this overlay?
> > > >
> > > > Because the overlay do not help when it is in /boot/dtb/overlays/ and
> > > > /boot/msdos/dtb/overlays/.
> > > >
> > >
> > > Did you add in /boot/loader.conf line like
> > >
> > > fdt_overlays="gpioiic"
> >
> > Yes.
> > I have
> > fdt_overlays="sun8i-h3-sid,sun8i-h3-ths,sun8i-h3-opp,sun8i-h3-gpio-iic0"
> >
> > where sun8i-h3-gpio-iic0 if gpioiic overlay.
> >
> > I see gpioiic in ofwdump -a output.
>
> Which means that the overlays was applied.
> I've spent a few hours yesterday to find how to use this module and
> the result is we can't. The reason is that the driver is at an higher
> bus pass number than the parent (gpiobus) so the driver isn't probed
> and is removed from the child list of gpiobus, meaning that it's never
> added later.
> ian@ and I agreed that it the driver would need to be rewritten
> because of this and because you cannot use gpio from different banks as
> it needs to be a children of one gpio controller.
> So the TLDR is : right now this driver is useless (at least on FDT
> system).
I am working on this, though. I'm thinking we should have something
usable later today, or at worst by the end of the weekend if it turns
complicated.
-- Ian
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