From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dmitry Osipenko Subject: Re: [PATCH v4 03/20] iommu/tegra: gart: Ignore devices without IOMMU phandle in DT Date: Mon, 24 Sep 2018 21:41:21 +0300 Message-ID: <8b3ece56-fda6-4e74-f69f-1e68b138e973@gmail.com> References: <20180924004153.8232-1-digetx@gmail.com> <20180924004153.8232-4-digetx@gmail.com> <20180924100525.GE21032@ulmo> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20180924100525.GE21032@ulmo> Content-Language: en-US List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: Thierry Reding Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Jonathan Hunter , iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, Rob Herring , linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Robin Murphy List-Id: devicetree@vger.kernel.org On 9/24/18 1:05 PM, Thierry Reding wrote: > On Mon, Sep 24, 2018 at 03:41:36AM +0300, Dmitry Osipenko wrote: >> GART can't handle all devices, hence ignore devices that aren't related >> to GART. IOMMU phandle must be explicitly assign to devices in the device >> tree. > > I think technically the GART can indeed handle all devices since it is > just a physical address region that can be used to remap other physical > addresses. That's not to say that doing so would be a good idea. So the > commit message here is slightly confusing, but other than that the idea > is good, so: > > Acked-by: Thierry Reding > It shouldn't be able to serve something like SDHCI, though I haven't tried to verify that.