From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joerg Roedel Subject: Re: [PATCH 2/7] dt-bindings: PCI: Describe ATS property for root complex nodes Date: Tue, 30 May 2017 12:01:53 +0200 Message-ID: <20170530100153.GI2818@8bytes.org> References: <20170524180143.19855-1-jean-philippe.brucker@arm.com> <20170524180143.19855-3-jean-philippe.brucker@arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20170524180143.19855-3-jean-philippe.brucker@arm.com> Sender: linux-pci-owner@vger.kernel.org To: Jean-Philippe Brucker Cc: linux-pci@vger.kernel.org, devicetree@vger.kernel.org, linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, iommu@lists.linux-foundation.org, bhelgaas@google.com, robh+dt@kernel.org, mark.rutland@arm.com, lorenzo.pieralisi@arm.com, hanjun.guo@linaro.org, sudeep.holla@arm.com, rjw@rjwysocki.net, lenb@kernel.org, will.deacon@arm.com, robin.murphy@arm.com, okaya@codeaurora.org, sunil.kovvuri@gmail.com, thunder.leizhen@huawei.com, tn@semihalf.com List-Id: devicetree@vger.kernel.org On Wed, May 24, 2017 at 07:01:38PM +0100, Jean-Philippe Brucker wrote: > +- ats-supported: if present, the root complex supports the Address > + Translation Service (ATS). It is able to interpret the AT field in PCIe > + Transaction Layer Packets, and forward Translation Completions or > + Invalidation Requests to endpoints. > + > + Device drivers should not enable ATS in endpoints unless this property > + is present. Device drivers should never enable ATS, this is the job of the IOMMU driver. This should be clarified in the text.