From mboxrd@z Thu Jan 1 00:00:00 1970 From: Will Deacon Subject: Re: [PATCH 11/13] dtb: amd: Add PCIe SMMU device tree node Date: Thu, 28 Jan 2016 14:27:52 +0000 Message-ID: <20160128142751.GA775@arm.com> References: <1453929121-12171-1-git-send-email-Suravee.Suthikulpanit@amd.com> <20160128111453.GG17123@leverpostej> <56AA07AA.7050701@arm.com> <6645680.g0j8d12m6d@wuerfel> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <6645680.g0j8d12m6d@wuerfel> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Arnd Bergmann Cc: Robin Murphy , Mark Rutland , Suravee Suthikulpanit , robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, pawel.moll-5wv7dgnIgG8@public.gmane.org, ijc+devicetree-KcIKpvwj1kUDXYZnReoRVg@public.gmane.org, galak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, arm-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, brijeshkumar.singh-5C7GfCeVMHo@public.gmane.org, thomas.lendacky-5C7GfCeVMHo@public.gmane.org, leo.duran-5C7GfCeVMHo@public.gmane.org List-Id: devicetree@vger.kernel.org On Thu, Jan 28, 2016 at 03:17:33PM +0100, Arnd Bergmann wrote: > On Thursday 28 January 2016 12:20:58 Robin Murphy wrote: > > > > > > Will, Robin, thoughts? > > > > Any IDs specified here would only apply to DMA by the "platform device" > > side of the host controller itself (as would an equivalent "iommus" > > property on pcie0 once I finish the SMMUv2 generic binding support I'm > > working on). In terms of PCI devices, the "mmu-masters" property is > > overloaded such that only its existence matters, to identify that there > > _is_ a relationship between the SMMU and the PCI bus(es) behind that > > host controller. > > I wasn't aware that this was actually still specified. I had hoped > we were getting rid of mmu-masters before anyone actually started > using it, but now I see it in ns2.dtsi and fsl-ls2080a.dtsi. > > Does anyone know what happened to the plan to use the iommu DT binding > for the ARM SMMU instead? Do we now have to support both ways indefinitely? We always did -- Seattle used the mmu-masters binding before the generic binding even existed. Robin has been working on patches to get of_xlate up and running, but it got held up by Laurent's series which didn't end up going anywhere. Will -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html