From mboxrd@z Thu Jan 1 00:00:00 1970 From: liviu.dudau-5wv7dgnIgG8@public.gmane.org Subject: Re: [PATCH v1 3/3] ARM64 LPC: update binding doc Date: Wed, 13 Jan 2016 10:09:11 +0000 Message-ID: <20160113100911.GU13633@e106497-lin.cambridge.arm.com> References: <1451396032-23708-1-git-send-email-zourongrong@gmail.com> <5694C6A4.8060308@huawei.com> <20160112101418.GO13633@e106497-lin.cambridge.arm.com> <4052627.BRvFkUij6q@wuerfel> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Content-Disposition: inline In-Reply-To: <4052627.BRvFkUij6q@wuerfel> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Arnd Bergmann Cc: Rongrong Zou , Rongrong Zou , devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Catalin Marinas , Corey Minyard , gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org, Will Deacon , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linuxarm-hv44wF8Li93QT0dZR+AlfA@public.gmane.org, benh-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org List-Id: devicetree@vger.kernel.org On Tue, Jan 12, 2016 at 11:54:59PM +0100, Arnd Bergmann wrote: > On Tuesday 12 January 2016 10:14:18 liviu.dudau-5wv7dgnIgG8@public.gmane.org wrote: > >=20 > > OK, looking at of_translate_one() comments it looks like a missing = "ranges" property is > > only accepted on PowerPC. I suggest you have an empty "ranges" prop= erty in your isa > > parent node, that will signal to the OF parsing code that the mappi= ng is 1:1. Then have > > the IPMI node use the reg =3D <0x0 0xe4 4>; property values instead= of reg =3D <0x1 0xe4 4>; > >=20 > >=20 >=20 > A missing ranges property means that there is no translation, while a= n > empty ranges means a 1:1 translation to the parent bus. >=20 > We really want the former here, as I/O port addresses are not mapped = into > the MMIO space of the parent bus. Agree. However of_translate_one()'s behaviour doesn't match our expecta= tions and I have no useful suggestions on what the right behaviour should be. Best regards, Liviu >=20 > Arnd >=20 --=20 =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D | I would like to | | fix the world, | | but they're not | | giving me the | \ source code! / --------------- =C2=AF\_(=E3=83=84)_/=C2=AF -- To unsubscribe from this list: send the line "unsubscribe devicetree" i= n the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html