1 # SPDX-License-Identifier: GPL-2.0-only
4 $id: http://devicetree.org/schemas/iommu/arm,smmu.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: ARM System MMU Architecture Implementation
10 - Will Deacon <will@kernel.org>
11 - Robin Murphy <Robin.Murphy@arm.com>
14 ARM SoCs may contain an implementation of the ARM System Memory
15 Management Unit Architecture, which can be used to provide 1 or 2 stages
16 of address translation to bus masters external to the CPU.
18 The SMMU may also raise interrupts in response to various fault
23 pattern: "^iommu@[0-9a-f]*"
26 - description: Qcom SoCs implementing "arm,smmu-v2"
29 - qcom,msm8996-smmu-v2
30 - qcom,msm8998-smmu-v2
34 - description: Qcom SoCs implementing "arm,mmu-500"
37 - qcom,sc7180-smmu-500
38 - qcom,sdm845-smmu-500
58 description: The number of global interrupts exposed by the device.
60 - $ref: /schemas/types.yaml#/definitions/uint32
62 maximum: 260 # 2 secure, 2 non-secure, and up to 256 perf counters
67 See Documentation/devicetree/bindings/iommu/iommu.txt for details. With a
68 value of 1, each IOMMU specifier represents a distinct stream ID emitted
69 by that device into the relevant SMMU.
71 SMMUs with stream matching support and complex masters may use a value of
72 2, where the second cell of the IOMMU specifier represents an SMR mask to
73 combine with the ID in the first cell. Care must be taken to ensure the
74 set of matched IDs does not result in conflicts.
78 maxItems: 388 # 260 plus 128 contexts
80 Interrupt list, with the first #global-interrupts entries corresponding to
81 the global interrupts and any following entries corresponding to context
82 interrupts, specified in order of their indexing by the SMMU.
84 For SMMUv2 implementations, there must be exactly one interrupt per
85 context bank. In the case of a single, combined interrupt, it must be
86 listed multiple times.
90 Present if page table walks made by the SMMU are cache coherent with the
93 NOTE: this only applies to the SMMU itself, not masters connected
96 calxeda,smmu-secure-config-access:
99 Enable proper handling of buggy implementations that always use secure
100 access to SMMU configuration registers. In this case non-secure aliases of
101 secure registers have to be used during SMMU configuration.
104 $ref: /schemas/types.yaml#/definitions/uint32
106 For SMMUs supporting stream matching and using #iommu-cells = <1>,
107 specifies a mask of bits to ignore when matching stream IDs (e.g. this may
108 be programmed into the SMRn.MASK field of every stream match register
109 used). For cases where it is desirable to ignore some portion of every
110 Stream ID (e.g. for certain MMU-500 configurations given globally unique
111 input IDs). This property is not valid for SMMUs using stream indexing, or
112 using stream matching with #iommu-cells = <2>, and may be ignored if
113 present in such cases.
122 - description: bus clock required for downstream bus access and for the
124 - description: interface clock required to access smmu's registers
125 through the TCU's programming interface.
133 - '#global-interrupts'
137 additionalProperties: false
141 /* SMMU with stream matching or stream indexing */
142 smmu1: iommu@ba5e0000 {
143 compatible = "arm,smmu-v1";
144 reg = <0xba5e0000 0x10000>;
145 #global-interrupts = <2>;
146 interrupts = <0 32 4>,
148 <0 34 4>, /* This is the first context interrupt */
155 /* device with two stream IDs, 0 and 7 */
162 /* SMMU with stream matching */
163 smmu2: iommu@ba5f0000 {
164 compatible = "arm,smmu-v1";
165 reg = <0xba5f0000 0x10000>;
166 #global-interrupts = <2>;
167 interrupts = <0 38 4>,
169 <0 40 4>, /* This is the first context interrupt */
176 /* device with stream IDs 0 and 7 */
178 iommus = <&smmu2 0 0>,
182 /* device with stream IDs 1, 17, 33 and 49 */
184 iommus = <&smmu2 1 0x30>;
188 /* ARM MMU-500 with 10-bit stream ID input configuration */
189 smmu3: iommu@ba600000 {
190 compatible = "arm,mmu-500", "arm,smmu-v2";
191 reg = <0xba600000 0x10000>;
192 #global-interrupts = <2>;
193 interrupts = <0 44 4>,
195 <0 46 4>, /* This is the first context interrupt */
200 /* always ignore appended 5-bit TBU number */
201 stream-match-mask = <0x7c00>;
205 /* bus whose child devices emit one unique 10-bit stream
206 ID each, but may master through multiple SMMU TBUs */
207 iommu-map = <0 &smmu3 0 0x400>;
213 /* Qcom's arm,smmu-v2 implementation */
214 #include <dt-bindings/interrupt-controller/arm-gic.h>
215 #include <dt-bindings/interrupt-controller/irq.h>
216 smmu4: iommu@d00000 {
217 compatible = "qcom,msm8996-smmu-v2", "qcom,smmu-v2";
218 reg = <0xd00000 0x10000>;
220 #global-interrupts = <1>;
221 interrupts = <GIC_SPI 73 IRQ_TYPE_LEVEL_HIGH>,
222 <GIC_SPI 320 IRQ_TYPE_LEVEL_HIGH>,
223 <GIC_SPI 321 IRQ_TYPE_LEVEL_HIGH>;
225 power-domains = <&mmcc 0>;
227 clocks = <&mmcc 123>,
229 clock-names = "bus", "iface";