An virtual iommu without reg or interrupts for display.
Adding this according to iommu driver changes.

Signed-off-by: Shunqian Zheng <zhen...@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>;
+       };
+
        display-subsystem {
                compatible = "rockchip,display-subsystem";
                ports = <&vopl_out>, <&vopb_out>;
+               iommus = <&display_mmu>;
        };
 
        sdmmc: dwmmc@ff0c0000 {
-- 
1.9.1

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