[PATCH v2 4/7] ARM: dts: rockchip: add virtual iommu for display
From: tfiga@chromium.org (Tomasz Figa)
Date: 2016-06-10 06:23:19
Also in:
dri-devel, linux-devicetree, linux-iommu, linux-rockchip, lkml
Hi, On Wed, Jun 8, 2016 at 10:26 PM, Shunqian Zheng [off-list ref] wrote:
quoted hunk ↗ jump to hunk
An virtual iommu without reg or interrupts for display. Adding this according to iommu driver changes. Signed-off-by: Shunqian Zheng <zhengsq@rock-chips.com> --- arch/arm/boot/dts/rk3288.dtsi | 6 ++++++ 1 file changed, 6 insertions(+)diff --git a/arch/arm/boot/dts/rk3288.dtsi b/arch/arm/boot/dts/rk3288.dtsi index 7fa932f..4cd535f 100644 --- a/arch/arm/boot/dts/rk3288.dtsi +++ b/arch/arm/boot/dts/rk3288.dtsi@@ -219,9 +219,15 @@ clock-names = "timer", "pclk"; }; + display_mmu: virtual-iommu { + compatible = "rockchip,iommu"; + #iommu-cells = <0>; + }; +
Device tree should describe real hardware and so it isn't really a good idea to add such virtual iommu, especially using a compatible string of a real device. Please see my comments to patch 3/7 for an alternative idea. Best regards, Tomasz