From mboxrd@z Thu Jan  1 00:00:00 1970
From: joro@8bytes.org (Joerg Roedel)
Date: Tue, 30 May 2017 12:01:53 +0200
Subject: [PATCH 2/7] dt-bindings: PCI: Describe ATS property for root
 complex nodes
In-Reply-To: <20170524180143.19855-3-jean-philippe.brucker@arm.com>
References: <20170524180143.19855-1-jean-philippe.brucker@arm.com>
 <20170524180143.19855-3-jean-philippe.brucker@arm.com>
Message-ID: <20170530100153.GI2818@8bytes.org>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.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.