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-* ARM System MMU Architecture Implementation
-
-ARM SoCs may contain an implementation of the ARM System Memory
-Management Unit Architecture, which can be used to provide 1 or 2 stages
-of address translation to bus masters external to the CPU.
-
-The SMMU may also raise interrupts in response to various fault
-conditions.
-
-** System MMU required properties:
-
-- compatible : Should be one of:
-
- "arm,smmu-v1"
- "arm,smmu-v2"
- "arm,mmu-400"
- "arm,mmu-401"
- "arm,mmu-500"
- "cavium,smmu-v2"
- "qcom,smmu-v2"
-
- depending on the particular implementation and/or the
- version of the architecture implemented.
-
- Qcom SoCs must contain, as below, SoC-specific compatibles
- along with "qcom,smmu-v2":
- "qcom,msm8996-smmu-v2", "qcom,smmu-v2",
- "qcom,sdm845-smmu-v2", "qcom,smmu-v2".
-
- Qcom SoCs implementing "arm,mmu-500" must also include,
- as below, SoC-specific compatibles:
- "qcom,sdm845-smmu-500", "arm,mmu-500"
-
-- reg : Base address and size of the SMMU.
-
-- #global-interrupts : The number of global interrupts exposed by the
- device.
-
-- interrupts : Interrupt list, with the first #global-irqs entries
- corresponding to the global interrupts and any
- following entries corresponding to context interrupts,
- specified in order of their indexing by the SMMU.
-
- For SMMUv2 implementations, there must be exactly one
- interrupt per context bank. In the case of a single,
- combined interrupt, it must be listed multiple times.
-
-- #iommu-cells : See Documentation/devicetree/bindings/iommu/iommu.txt
- for details. With a value of 1, each IOMMU specifier
- represents a distinct stream ID emitted by that device
- into the relevant SMMU.
-
- SMMUs with stream matching support and complex masters
- may use a value of 2, where the second cell of the
- IOMMU specifier represents an SMR mask to combine with
- the ID in the first cell. Care must be taken to ensure
- the set of matched IDs does not result in conflicts.
-
-** System MMU optional properties:
-
-- dma-coherent : Present if page table walks made by the SMMU are
- cache coherent with the CPU.
-
- NOTE: this only applies to the SMMU itself, not
- masters connected upstream of the SMMU.
-
-- calxeda,smmu-secure-config-access : Enable proper handling of buggy
- implementations that always use secure access to
- SMMU configuration registers. In this case non-secure
- aliases of secure registers have to be used during
- SMMU configuration.
-
-- stream-match-mask : For SMMUs supporting stream matching and using
- #iommu-cells = <1>, specifies a mask of bits to ignore
- when matching stream IDs (e.g. this may be programmed
- into the SMRn.MASK field of every stream match register
- used). For cases where it is desirable to ignore some
- portion of every Stream ID (e.g. for certain MMU-500
- configurations given globally unique input IDs). This
- property is not valid for SMMUs using stream indexing,
- or using stream matching with #iommu-cells = <2>, and
- may be ignored if present in such cases.
-
-- clock-names: List of the names of clocks input to the device. The
- required list depends on particular implementation and
- is as follows:
- - for "qcom,smmu-v2":
- - "bus": clock required for downstream bus access and
- for the smmu ptw,
- - "iface": clock required to access smmu's registers
- through the TCU's programming interface.
- - unspecified for other implementations.
-
-- clocks: Specifiers for all clocks listed in the clock-names property,
- as per generic clock bindings.
-
-- power-domains: Specifiers for power domains required to be powered on for
- the SMMU to operate, as per generic power domain bindings.
-
-** Deprecated properties:
-
-- mmu-masters (deprecated in favour of the generic "iommus" binding) :
- A list of phandles to device nodes representing bus
- masters for which the SMMU can provide a translation
- and their corresponding Stream IDs. Each device node
- linked from this list must have a "#stream-id-cells"
- property, indicating the number of Stream ID
- arguments associated with its phandle.
-
-** Examples:
-
- /* SMMU with stream matching or stream indexing */
- smmu1: iommu {
- compatible = "arm,smmu-v1";
- reg = <0xba5e0000 0x10000>;
- #global-interrupts = <2>;
- interrupts = <0 32 4>,
- <0 33 4>,
- <0 34 4>, /* This is the first context interrupt */
- <0 35 4>,
- <0 36 4>,
- <0 37 4>;
- #iommu-cells = <1>;
- };
-
- /* device with two stream IDs, 0 and 7 */
- master1 {
- iommus = <&smmu1 0>,
- <&smmu1 7>;
- };
-
-
- /* SMMU with stream matching */
- smmu2: iommu {
- ...
- #iommu-cells = <2>;
- };
-
- /* device with stream IDs 0 and 7 */
- master2 {
- iommus = <&smmu2 0 0>,
- <&smmu2 7 0>;
- };
-
- /* device with stream IDs 1, 17, 33 and 49 */
- master3 {
- iommus = <&smmu2 1 0x30>;
- };
-
-
- /* ARM MMU-500 with 10-bit stream ID input configuration */
- smmu3: iommu {
- compatible = "arm,mmu-500", "arm,smmu-v2";
- ...
- #iommu-cells = <1>;
- /* always ignore appended 5-bit TBU number */
- stream-match-mask = 0x7c00;
- };
-
- bus {
- /* bus whose child devices emit one unique 10-bit stream
- ID each, but may master through multiple SMMU TBUs */
- iommu-map = <0 &smmu3 0 0x400>;
- ...
- };
-
- /* Qcom's arm,smmu-v2 implementation */
- smmu4: iommu@d00000 {
- compatible = "qcom,msm8996-smmu-v2", "qcom,smmu-v2";
- reg = <0xd00000 0x10000>;
-
- #global-interrupts = <1>;
- interrupts = <GIC_SPI 73 IRQ_TYPE_LEVEL_HIGH>,
- <GIC_SPI 320 IRQ_TYPE_LEVEL_HIGH>,
- <GIC_SPI 321 IRQ_TYPE_LEVEL_HIGH>;
- #iommu-cells = <1>;
- power-domains = <&mmcc MDSS_GDSC>;
-
- clocks = <&mmcc SMMU_MDP_AXI_CLK>,
- <&mmcc SMMU_MDP_AHB_CLK>;
- clock-names = "bus", "iface";
- };
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+# SPDX-License-Identifier: GPL-2.0-only
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iommu/arm,smmu.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ARM System MMU Architecture Implementation
+
+maintainers:
+ - Will Deacon <will@kernel.org>
+ - Robin Murphy <Robin.Murphy@arm.com>
+
+description: |+
+ ARM SoCs may contain an implementation of the ARM System Memory
+ Management Unit Architecture, which can be used to provide 1 or 2 stages
+ of address translation to bus masters external to the CPU.
+
+ The SMMU may also raise interrupts in response to various fault
+ conditions.
+
+properties:
+ $nodename:
+ pattern: "^iommu@[0-9a-f]*"
+ compatible:
+ oneOf:
+ - description: Qcom SoCs implementing "arm,smmu-v2"
+ items:
+ - enum:
+ - qcom,msm8996-smmu-v2
+ - qcom,msm8998-smmu-v2
+ - qcom,sdm845-smmu-v2
+ - const: qcom,smmu-v2
+
+ - description: Qcom SoCs implementing "arm,mmu-500"
+ items:
+ - enum:
+ - qcom,sdm845-smmu-500
+ - const: arm,mmu-500
+ - items:
+ - const: arm,mmu-500
+ - const: arm,smmu-v2
+ - items:
+ - const: arm,mmu-401
+ - const: arm,smmu-v1
+ - enum:
+ - arm,smmu-v1
+ - arm,smmu-v2
+ - arm,mmu-400
+ - arm,mmu-401
+ - arm,mmu-500
+ - cavium,smmu-v2
+
+ reg:
+ maxItems: 1
+
+ '#global-interrupts':
+ description: The number of global interrupts exposed by the device.
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ minimum: 0
+ maximum: 260 # 2 secure, 2 non-secure, and up to 256 perf counters
+
+ '#iommu-cells':
+ enum: [ 1, 2 ]
+ description: |
+ See Documentation/devicetree/bindings/iommu/iommu.txt for details. With a
+ value of 1, each IOMMU specifier represents a distinct stream ID emitted
+ by that device into the relevant SMMU.
+
+ SMMUs with stream matching support and complex masters may use a value of
+ 2, where the second cell of the IOMMU specifier represents an SMR mask to
+ combine with the ID in the first cell. Care must be taken to ensure the
+ set of matched IDs does not result in conflicts.
+
+ interrupts:
+ minItems: 1
+ maxItems: 388 # 260 plus 128 contexts
+ description: |
+ Interrupt list, with the first #global-interrupts entries corresponding to
+ the global interrupts and any following entries corresponding to context
+ interrupts, specified in order of their indexing by the SMMU.
+
+ For SMMUv2 implementations, there must be exactly one interrupt per
+ context bank. In the case of a single, combined interrupt, it must be
+ listed multiple times.
+
+ dma-coherent:
+ description: |
+ Present if page table walks made by the SMMU are cache coherent with the
+ CPU.
+
+ NOTE: this only applies to the SMMU itself, not masters connected
+ upstream of the SMMU.
+
+ calxeda,smmu-secure-config-access:
+ type: boolean
+ description:
+ Enable proper handling of buggy implementations that always use secure
+ access to SMMU configuration registers. In this case non-secure aliases of
+ secure registers have to be used during SMMU configuration.
+
+ stream-match-mask:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: |
+ For SMMUs supporting stream matching and using #iommu-cells = <1>,
+ specifies a mask of bits to ignore when matching stream IDs (e.g. this may
+ be programmed into the SMRn.MASK field of every stream match register
+ used). For cases where it is desirable to ignore some portion of every
+ Stream ID (e.g. for certain MMU-500 configurations given globally unique
+ input IDs). This property is not valid for SMMUs using stream indexing, or
+ using stream matching with #iommu-cells = <2>, and may be ignored if
+ present in such cases.
+
+ clock-names:
+ items:
+ - const: bus
+ - const: iface
+
+ clocks:
+ items:
+ - description: bus clock required for downstream bus access and for the
+ smmu ptw
+ - description: interface clock required to access smmu's registers
+ through the TCU's programming interface.
+
+ power-domains:
+ maxItems: 1
+
+required:
+ - compatible
+ - reg
+ - '#global-interrupts'
+ - '#iommu-cells'
+ - interrupts
+
+additionalProperties: false
+
+examples:
+ - |+
+ /* SMMU with stream matching or stream indexing */
+ smmu1: iommu@ba5e0000 {
+ compatible = "arm,smmu-v1";
+ reg = <0xba5e0000 0x10000>;
+ #global-interrupts = <2>;
+ interrupts = <0 32 4>,
+ <0 33 4>,
+ <0 34 4>, /* This is the first context interrupt */
+ <0 35 4>,
+ <0 36 4>,
+ <0 37 4>;
+ #iommu-cells = <1>;
+ };
+
+ /* device with two stream IDs, 0 and 7 */
+ master1 {
+ iommus = <&smmu1 0>,
+ <&smmu1 7>;
+ };
+
+
+ /* SMMU with stream matching */
+ smmu2: iommu@ba5f0000 {
+ compatible = "arm,smmu-v1";
+ reg = <0xba5f0000 0x10000>;
+ #global-interrupts = <2>;
+ interrupts = <0 38 4>,
+ <0 39 4>,
+ <0 40 4>, /* This is the first context interrupt */
+ <0 41 4>,
+ <0 42 4>,
+ <0 43 4>;
+ #iommu-cells = <2>;
+ };
+
+ /* device with stream IDs 0 and 7 */
+ master2 {
+ iommus = <&smmu2 0 0>,
+ <&smmu2 7 0>;
+ };
+
+ /* device with stream IDs 1, 17, 33 and 49 */
+ master3 {
+ iommus = <&smmu2 1 0x30>;
+ };
+
+
+ /* ARM MMU-500 with 10-bit stream ID input configuration */
+ smmu3: iommu@ba600000 {
+ compatible = "arm,mmu-500", "arm,smmu-v2";
+ reg = <0xba600000 0x10000>;
+ #global-interrupts = <2>;
+ interrupts = <0 44 4>,
+ <0 45 4>,
+ <0 46 4>, /* This is the first context interrupt */
+ <0 47 4>,
+ <0 48 4>,
+ <0 49 4>;
+ #iommu-cells = <1>;
+ /* always ignore appended 5-bit TBU number */
+ stream-match-mask = <0x7c00>;
+ };
+
+ bus {
+ /* bus whose child devices emit one unique 10-bit stream
+ ID each, but may master through multiple SMMU TBUs */
+ iommu-map = <0 &smmu3 0 0x400>;
+
+
+ };
+
+ - |+
+ /* Qcom's arm,smmu-v2 implementation */
+ #include <dt-bindings/interrupt-controller/arm-gic.h>
+ #include <dt-bindings/interrupt-controller/irq.h>
+ smmu4: iommu@d00000 {
+ compatible = "qcom,msm8996-smmu-v2", "qcom,smmu-v2";
+ reg = <0xd00000 0x10000>;
+
+ #global-interrupts = <1>;
+ interrupts = <GIC_SPI 73 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 320 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 321 IRQ_TYPE_LEVEL_HIGH>;
+ #iommu-cells = <1>;
+ power-domains = <&mmcc 0>;
+
+ clocks = <&mmcc 123>,
+ <&mmcc 124>;
+ clock-names = "bus", "iface";
+ };
Convert the Arm SMMU binding to DT schema. The existing binding doc doesn't cover the number of variations of compatible properties found in .dts files. "qcom,msm8998-smmu-v2" was also missing, so add it. SoCFPGA Stratix10 has a single clock defined which doesn't match the binding. This issue remains. Cc: Joerg Roedel <joro@8bytes.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Will Deacon <will@kernel.org> Cc: Robin Murphy <Robin.Murphy@arm.com> Cc: iommu@lists.linux-foundation.org Signed-off-by: Rob Herring <robh@kernel.org> --- .../devicetree/bindings/iommu/arm,smmu.txt | 182 -------------- .../devicetree/bindings/iommu/arm,smmu.yaml | 229 ++++++++++++++++++ 2 files changed, 229 insertions(+), 182 deletions(-) delete mode 100644 Documentation/devicetree/bindings/iommu/arm,smmu.txt create mode 100644 Documentation/devicetree/bindings/iommu/arm,smmu.yaml -- 2.20.1