new file mode 100644
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+* Mediatek IOMMU Architecture Implementation
+
+ Mediatek Socs may contain a implementation of Multimedia Memory
+Management Unit(M4U),which use ARM Short-descriptor translation table
+to achieve address translation.
+
+ The IOMMU Hardware Block Diagram, please check below:
+
+ EMI (External Memory Interface)
+ |
+ m4u (Multimedia Memory Management Unit)
+ |
+ smi (Smart Multimedia Interface)
+ |
+ +---------------+-------
+ | |
+ | |
+ vdec larb disp larb ... SoCs have different local arbiter(larb).
+ | |
+ | |
+ +----+----+ +-----+-----+
+ | | | | | | ...
+ | | | | | | ...
+ | | | | | | ...
+ MC PP VLD OVL0 RDMA0 WDMA0 ... There are different ports in each larb.
+
+ As above, The Multimedia HW will go through SMI and M4U while it
+access EMI. SMI is a brige between m4u and the Multimedia HW. It contain
+smi local arbiter and smi common. It will control whether the Multimedia
+HW should go though the m4u for translation or bypass it and talk
+directly with EMI. And also SMI help control the clocks for each
+local arbiter.
+ Normally we specify a local arbiter(larb) for each multimedia HW
+like display, video decode, and camera. And there are different ports
+in each larb. Take a example, There are some ports like MC, PP, VLD in the
+video decode local arbiter, all the ports are according to the video HW.
+
+Required properties:
+- compatible : must be "mediatek,mt8173-m4u".
+- reg : m4u register base and size.
+- interrupts : the interrupt of m4u.
+- clocks : must contain one entry for each clock-names.
+- clock-names : must be "bclk", It is the block clock of m4u.
+- mediatek,larb : List of phandle to the local arbiters in the current Socs.
+ Refer to bindings/memory-controllers/mediatek,smi-larb.txt. It must sort
+ according to the local arbiter index, like larb0, larb1, larb2...
+- iommu-cells : must be 2. There are 2 cells needed to enable/disable iommu.
+ The first one is local arbiter index(larbid), and the other is port
+ index(portid) within local arbiter. Specifies the larbid and portid as
+ defined in dt-binding/memory/mt8173-larb-port.h.
+
+Example:
+ iommu: mmsys_iommu@10205000 {
+ compatible = "mediatek,mt8173-m4u";
+ reg = <0 0x10205000 0 0x1000>;
+ interrupts = <GIC_SPI 139 IRQ_TYPE_LEVEL_LOW>;
+ clocks = <&infracfg CLK_INFRA_M4U>;
+ clock-names = "bclk";
+ mediatek,larb = <&larb0 &larb1 &larb2 &larb3 &larb4 &larb5>;
+ #iommu-cells = <2>;
+ };
new file mode 100644
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+/*
+ * Copyright (c) 2014-2015 MediaTek Inc.
+ * Author: Yong Wu <yong.wu@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+#ifndef __DTS_IOMMU_PORT_MT8173_H
+#define __DTS_IOMMU_PORT_MT8173_H
+
+#define M4U_LARB0_ID 0
+#define M4U_LARB1_ID 1
+#define M4U_LARB2_ID 2
+#define M4U_LARB3_ID 3
+#define M4U_LARB4_ID 4
+#define M4U_LARB5_ID 5
+
+/* larb0 */
+#define M4U_PORT_DISP_OVL0 0
+#define M4U_PORT_DISP_RDMA0 1
+#define M4U_PORT_DISP_WDMA0 2
+#define M4U_PORT_DISP_OD_R 3
+#define M4U_PORT_DISP_OD_W 4
+#define M4U_PORT_MDP_RDMA0 5
+#define M4U_PORT_MDP_WDMA 6
+#define M4U_PORT_MDP_WROT0 7
+
+/* larb1 */
+#define M4U_PORT_HW_VDEC_MC_EXT 0
+#define M4U_PORT_HW_VDEC_PP_EXT 1
+#define M4U_PORT_HW_VDEC_UFO_EXT 2
+#define M4U_PORT_HW_VDEC_VLD_EXT 3
+#define M4U_PORT_HW_VDEC_VLD2_EXT 4
+#define M4U_PORT_HW_VDEC_AVC_MV_EXT 5
+#define M4U_PORT_HW_VDEC_PRED_RD_EXT 6
+#define M4U_PORT_HW_VDEC_PRED_WR_EXT 7
+#define M4U_PORT_HW_VDEC_PPWRAP_EXT 8
+#define M4U_PORT_HW_VDEC_TILE 9
+
+/* larb2 */
+#define M4U_PORT_IMGO 0
+#define M4U_PORT_RRZO 1
+#define M4U_PORT_AAO 2
+#define M4U_PORT_LCSO 3
+#define M4U_PORT_ESFKO 4
+#define M4U_PORT_IMGO_D 5
+#define M4U_PORT_LSCI 6
+#define M4U_PORT_LSCI_D 7
+#define M4U_PORT_BPCI 8
+#define M4U_PORT_BPCI_D 9
+#define M4U_PORT_UFDI 10
+#define M4U_PORT_IMGI 11
+#define M4U_PORT_IMG2O 12
+#define M4U_PORT_IMG3O 13
+#define M4U_PORT_VIPI 14
+#define M4U_PORT_VIP2I 15
+#define M4U_PORT_VIP3I 16
+#define M4U_PORT_LCEI 17
+#define M4U_PORT_RB 18
+#define M4U_PORT_RP 19
+#define M4U_PORT_WR 20
+
+/* larb3 */
+#define M4U_PORT_VENC_RCPU 0
+#define M4U_PORT_VENC_REC 1
+#define M4U_PORT_VENC_BSDMA 2
+#define M4U_PORT_VENC_SV_COMV 3
+#define M4U_PORT_VENC_RD_COMV 4
+#define M4U_PORT_JPGENC_RDMA 5
+#define M4U_PORT_JPGENC_BSDMA 6
+#define M4U_PORT_JPGDEC_WDMA 7
+#define M4U_PORT_JPGDEC_BSDMA 8
+#define M4U_PORT_VENC_CUR_LUMA 9
+#define M4U_PORT_VENC_CUR_CHROMA 10
+#define M4U_PORT_VENC_REF_LUMA 11
+#define M4U_PORT_VENC_REF_CHROMA 12
+#define M4U_PORT_VENC_NBM_RDMA 13
+#define M4U_PORT_VENC_NBM_WDMA 14
+
+/* larb4 */
+#define M4U_PORT_DISP_OVL1 0
+#define M4U_PORT_DISP_RDMA1 1
+#define M4U_PORT_DISP_RDMA2 2
+#define M4U_PORT_DISP_WDMA1 3
+#define M4U_PORT_MDP_RDMA1 4
+#define M4U_PORT_MDP_WROT1 5
+
+/* larb5 */
+#define M4U_PORT_VENC_RCPU_SET2 0
+#define M4U_PORT_VENC_REC_FRM_SET2 1
+#define M4U_PORT_VENC_REF_LUMA_SET2 2
+#define M4U_PORT_VENC_REC_CHROMA_SET2 3
+#define M4U_PORT_VENC_BSDMA_SET2 4
+#define M4U_PORT_VENC_CUR_LUMA_SET2 5
+#define M4U_PORT_VENC_CUR_CHROMA_SET2 6
+#define M4U_PORT_VENC_RD_COMA_SET2 7
+#define M4U_PORT_VENC_SV_COMA_SET2 8
+
+#endif
This patch add mediatek iommu dts binding document. Signed-off-by: Yong Wu <yong.wu@mediatek.com> --- .../devicetree/bindings/iommu/mediatek,iommu.txt | 61 ++++++++++++ include/dt-bindings/memory/mt8173-larb-port.h | 105 +++++++++++++++++++++ 2 files changed, 166 insertions(+) create mode 100644 Documentation/devicetree/bindings/iommu/mediatek,iommu.txt create mode 100644 include/dt-bindings/memory/mt8173-larb-port.h