1 Mediatek display subsystem
2 ==========================
4 The Mediatek display subsystem consists of various DISP function blocks in the
5 MMSYS register space. The connections between them can be configured by output
6 and input selectors in the MMSYS_CONFIG register space. Pixel clock and start
7 of frame signal are distributed to the other function blocks by a DISP_MUTEX
10 All DISP device tree nodes must be siblings to the central MMSYS_CONFIG node.
11 For a description of the MMSYS_CONFIG binding, see
12 Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.txt.
17 A display stream starts at a source function block that reads pixel data from
18 memory and ends with a sink function block that drives pixels on a display
19 interface, or writes pixels back to memory. All DISP function blocks have
20 their own register space, interrupt, and clock gate. The blocks that can
21 access memory additionally have to list the IOMMU and local arbiter they are
24 For a description of the display interface sink function blocks, see
25 Documentation/devicetree/bindings/display/mediatek/mediatek,dsi.txt and
26 Documentation/devicetree/bindings/display/mediatek/mediatek,dpi.txt.
28 Required properties (all function blocks):
29 - compatible: "mediatek,<chip>-disp-<function>", one of
30 "mediatek,<chip>-disp-ovl" - overlay (4 layers, blending, csc)
31 "mediatek,<chip>-disp-rdma" - read DMA / line buffer
32 "mediatek,<chip>-disp-wdma" - write DMA
33 "mediatek,<chip>-disp-color" - color processor
34 "mediatek,<chip>-disp-aal" - adaptive ambient light controller
35 "mediatek,<chip>-disp-gamma" - gamma correction
36 "mediatek,<chip>-disp-merge" - merge streams from two RDMA sources
37 "mediatek,<chip>-disp-split" - split stream to two encoders
38 "mediatek,<chip>-disp-ufoe" - data compression engine
39 "mediatek,<chip>-dsi" - DSI controller, see mediatek,dsi.txt
40 "mediatek,<chip>-dpi" - DPI controller, see mediatek,dpi.txt
41 "mediatek,<chip>-disp-mutex" - display mutex
42 "mediatek,<chip>-disp-od" - overdrive
43 the supported chips are mt2701 and mt8173.
44 - reg: Physical base address and length of the function block register space
45 - interrupts: The interrupt signal from the function block (required, except for
46 merge and split function blocks).
47 - clocks: device clocks
48 See Documentation/devicetree/bindings/clock/clock-bindings.txt for details.
49 For most function blocks this is just a single clock input. Only the DSI and
50 DPI controller nodes have multiple clock inputs. These are documented in
51 mediatek,dsi.txt and mediatek,dpi.txt, respectively.
53 Required properties (DMA function blocks):
54 - compatible: Should be one of
55 "mediatek,<chip>-disp-ovl"
56 "mediatek,<chip>-disp-rdma"
57 "mediatek,<chip>-disp-wdma"
58 the supported chips are mt2701 and mt8173.
59 - larb: Should contain a phandle pointing to the local arbiter device as defined
60 in Documentation/devicetree/bindings/memory-controllers/mediatek,smi-larb.txt
61 - iommus: Should point to the respective IOMMU block with master port as
62 argument, see Documentation/devicetree/bindings/iommu/mediatek,iommu.txt
67 mmsys: clock-controller@14000000 {
68 compatible = "mediatek,mt8173-mmsys", "syscon";
69 reg = <0 0x14000000 0 0x1000>;
70 power-domains = <&scpsys MT8173_POWER_DOMAIN_MM>;
75 compatible = "mediatek,mt8173-disp-ovl";
76 reg = <0 0x1400c000 0 0x1000>;
77 interrupts = <GIC_SPI 180 IRQ_TYPE_LEVEL_LOW>;
78 power-domains = <&scpsys MT8173_POWER_DOMAIN_MM>;
79 clocks = <&mmsys CLK_MM_DISP_OVL0>;
80 iommus = <&iommu M4U_PORT_DISP_OVL0>;
81 mediatek,larb = <&larb0>;
85 compatible = "mediatek,mt8173-disp-ovl";
86 reg = <0 0x1400d000 0 0x1000>;
87 interrupts = <GIC_SPI 181 IRQ_TYPE_LEVEL_LOW>;
88 power-domains = <&scpsys MT8173_POWER_DOMAIN_MM>;
89 clocks = <&mmsys CLK_MM_DISP_OVL1>;
90 iommus = <&iommu M4U_PORT_DISP_OVL1>;
91 mediatek,larb = <&larb4>;
94 rdma0: rdma@1400e000 {
95 compatible = "mediatek,mt8173-disp-rdma";
96 reg = <0 0x1400e000 0 0x1000>;
97 interrupts = <GIC_SPI 182 IRQ_TYPE_LEVEL_LOW>;
98 power-domains = <&scpsys MT8173_POWER_DOMAIN_MM>;
99 clocks = <&mmsys CLK_MM_DISP_RDMA0>;
100 iommus = <&iommu M4U_PORT_DISP_RDMA0>;
101 mediatek,larb = <&larb0>;
104 rdma1: rdma@1400f000 {
105 compatible = "mediatek,mt8173-disp-rdma";
106 reg = <0 0x1400f000 0 0x1000>;
107 interrupts = <GIC_SPI 183 IRQ_TYPE_LEVEL_LOW>;
108 power-domains = <&scpsys MT8173_POWER_DOMAIN_MM>;
109 clocks = <&mmsys CLK_MM_DISP_RDMA1>;
110 iommus = <&iommu M4U_PORT_DISP_RDMA1>;
111 mediatek,larb = <&larb4>;
114 rdma2: rdma@14010000 {
115 compatible = "mediatek,mt8173-disp-rdma";
116 reg = <0 0x14010000 0 0x1000>;
117 interrupts = <GIC_SPI 184 IRQ_TYPE_LEVEL_LOW>;
118 power-domains = <&scpsys MT8173_POWER_DOMAIN_MM>;
119 clocks = <&mmsys CLK_MM_DISP_RDMA2>;
120 iommus = <&iommu M4U_PORT_DISP_RDMA2>;
121 mediatek,larb = <&larb4>;
124 wdma0: wdma@14011000 {
125 compatible = "mediatek,mt8173-disp-wdma";
126 reg = <0 0x14011000 0 0x1000>;
127 interrupts = <GIC_SPI 185 IRQ_TYPE_LEVEL_LOW>;
128 power-domains = <&scpsys MT8173_POWER_DOMAIN_MM>;
129 clocks = <&mmsys CLK_MM_DISP_WDMA0>;
130 iommus = <&iommu M4U_PORT_DISP_WDMA0>;
131 mediatek,larb = <&larb0>;
134 wdma1: wdma@14012000 {
135 compatible = "mediatek,mt8173-disp-wdma";
136 reg = <0 0x14012000 0 0x1000>;
137 interrupts = <GIC_SPI 186 IRQ_TYPE_LEVEL_LOW>;
138 power-domains = <&scpsys MT8173_POWER_DOMAIN_MM>;
139 clocks = <&mmsys CLK_MM_DISP_WDMA1>;
140 iommus = <&iommu M4U_PORT_DISP_WDMA1>;
141 mediatek,larb = <&larb4>;
144 color0: color@14013000 {
145 compatible = "mediatek,mt8173-disp-color";
146 reg = <0 0x14013000 0 0x1000>;
147 interrupts = <GIC_SPI 187 IRQ_TYPE_LEVEL_LOW>;
148 power-domains = <&scpsys MT8173_POWER_DOMAIN_MM>;
149 clocks = <&mmsys CLK_MM_DISP_COLOR0>;
152 color1: color@14014000 {
153 compatible = "mediatek,mt8173-disp-color";
154 reg = <0 0x14014000 0 0x1000>;
155 interrupts = <GIC_SPI 188 IRQ_TYPE_LEVEL_LOW>;
156 power-domains = <&scpsys MT8173_POWER_DOMAIN_MM>;
157 clocks = <&mmsys CLK_MM_DISP_COLOR1>;
161 compatible = "mediatek,mt8173-disp-aal";
162 reg = <0 0x14015000 0 0x1000>;
163 interrupts = <GIC_SPI 189 IRQ_TYPE_LEVEL_LOW>;
164 power-domains = <&scpsys MT8173_POWER_DOMAIN_MM>;
165 clocks = <&mmsys CLK_MM_DISP_AAL>;
169 compatible = "mediatek,mt8173-disp-gamma";
170 reg = <0 0x14016000 0 0x1000>;
171 interrupts = <GIC_SPI 190 IRQ_TYPE_LEVEL_LOW>;
172 power-domains = <&scpsys MT8173_POWER_DOMAIN_MM>;
173 clocks = <&mmsys CLK_MM_DISP_GAMMA>;
177 compatible = "mediatek,mt8173-disp-ufoe";
178 reg = <0 0x1401a000 0 0x1000>;
179 interrupts = <GIC_SPI 191 IRQ_TYPE_LEVEL_LOW>;
180 power-domains = <&scpsys MT8173_POWER_DOMAIN_MM>;
181 clocks = <&mmsys CLK_MM_DISP_UFOE>;
185 /* See mediatek,dsi.txt for details */
189 /* See mediatek,dpi.txt for details */
192 mutex: mutex@14020000 {
193 compatible = "mediatek,mt8173-disp-mutex";
194 reg = <0 0x14020000 0 0x1000>;
195 interrupts = <GIC_SPI 169 IRQ_TYPE_LEVEL_LOW>;
196 power-domains = <&scpsys MT8173_POWER_DOMAIN_MM>;
197 clocks = <&mmsys CLK_MM_MUTEX_32K>;
201 compatible = "mediatek,mt8173-disp-od";
202 reg = <0 0x14023000 0 0x1000>;
203 power-domains = <&scpsys MT8173_POWER_DOMAIN_MM>;
204 clocks = <&mmsys CLK_MM_DISP_OD>;