dt-bindings: iommu: Convert Arm SMMU to DT schema (d27bd6b9) · Commits · 方亚芬 / linux

Documentation/devicetree/bindings/iommu/arm,smmu.txt

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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";
		};

Documentation/devicetree/bindings/iommu/arm,smmu.yaml

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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";
		};