dt-bindings: Merge all IOMMU documentation from msm-4.19 to msm-lahaina

                        "arm,mmu-401"

                        "arm,mmu-500"

                        "cavium,smmu-v2"

                        "qcom,qsmmu-v500"

                        "qcom,smmu-v2"

                  depending on the particular implementation and/or the

- reg           : Base address and size of the SMMU.

- reg-names	: For the "qcom,qsmmu-v500" device "tcu-base" is expected.

- #global-interrupts : The number of global interrupts exposed by the

                       device.

- power-domains:  Specifiers for power domains required to be powered on for

                  the SMMU to operate, as per generic power domain bindings.

- attach-impl-defs : global registers to program at device attach

                  time. This should be a list of 2-tuples of the format:

                  <offset reg_value>.

- qcom,fatal-asf : Enable BUG_ON for address size faults.  Some hardware

                  requires special fixups to recover from address size

                  faults.  Rather than applying the fixups just BUG since

                  address size faults are due to a fundamental programming

                  error from which we don't care about recovering anyways.

- qcom,skip-init : Disable resetting configuration for all context banks

                  during device reset.  This is useful for targets where

                  some context banks are dedicated to other execution

                  environments outside of Linux and those other EEs are

                  programming their own stream match tables, SCTLR, etc.

                  Without setting this option we will trample on their

                  configuration.

- qcom,use-3-lvl-tables:

		  Some hardware configurations may not be optimized for using

		  a four level page table configuration. Set to use a three

		  level page table instead.

- qcom,no-asid-retention:

		  Some hardware may lose internal state for asid after

		  retention. No cache invalidation operations involving asid

		  may be used.

- qcom,actlr:

		  An array of <sid mask actlr-setting>.

		  Any sid X for which X&~mask==sid will be programmed with the

		  given actlr-setting.

-qcom,disable-atos:

		  Some hardware may not have full support for atos debugging

		  in tandem with other features like power collapse.

-qcom,opt-out-tbu-halting:

		  Allow certain TBUs to opt-out from being halted for the

		  ATOS operation to proceed. Halting certain TBUs would cause

		  considerable impact to the system such as deadlocks on demand.

		  Such TBUs can be opted out to be halted from software.

- qcom,deferred-regulator-disable-delay : The time delay for deferred regulator

                  disable in ms. In case of unmap call, regulator is

                  enabled/disabled. This may introduce additional delay. For

                  clients who do not detach, it's not possible to keep regulator

                  vote while smmu is attached. Type is <u32>.

- (%s)-supply   : Phandle of the regulator that should be powered on during

                  SMMU register access. (%s) is a string from the

		  qcom,regulator-names property.

- qcom,regulator-names :

		  List of strings to use with the (%s)-supply property.

- interconnects:

		  Pairs of phandles and interconnect provider specifier to

		  denote the edge source and destination ports of the

		  interconnect path. For more information, please see

		  bindings/interconnect/interconnect.txt

** Deprecated properties:

- mmu-masters (deprecated in favour of the generic "iommus" binding) :

                  property, indicating the number of Stream ID

                  arguments associated with its phandle.

** Additional properties for Iommu Clients:

- qcom,iommu-dma:

		Optional, String.

		Can be one of "bypass", "fastmap", "atomic", "disabled".

--- "default":

		Standard iommu translation behavior.

		The iommu framework will automatically create a domain for the client.

		iommu and DMA apis may not be called in atomic context.

--- "bypass":

		DMA APIs will use 1-to-1 translation between dma_addr and phys_addr.

		Allows using iommu and DMA apis in atomic context.

--- "fastmap":

		DMA APIs will run faster, but use several orders of magnitude more memory.

		Also allows using iommu and DMA apis in atomic context.

--- "atomic":

		Allows using iommu and DMA apis in atomic context.

--- "disabled":

		The iommu client is responsible for allocating an iommu domain, as

		well as calling iommu_map to create the desired mappings.

- qcom,iommu-faults:

		Optional, List of Strings.

		The SCTLR register setting which affect iommu faults handling.

		Any combination of the below strings may be used. Mutliple

		values are accepted.

--- "default":

		Any faults are treated as fatal errors.

--- "no-CFRE":

		Iommu faults do not return an abort to the client hardware.

--- "non-fatal":

		Iommu faults do not trigger a kernel panic.

--- "stall-disable":

		Iommu faults do not stall the client while the fault

		interrupt is being handled.

- qcom,iommu-vmid:

		Optional, Int.

		An identifier indicating the security state of the client.

- qcom,iommu-pagetable:

		Optional, String.

		Enables coherency for the IOMMU device, but not for the Client.

--- "default":

		Pagetables are not coherent nor cached in the system cache..

--- "coherent"

		Pagetables are io-coherent.

--- "LLC"

		Pagetables may be saved in the system cache.

--- "LLC_NWA"

		Pagetables may be saved in the system cache is used, and

		 write-allocate hint is disabled.

- qcom,iommu-earlymap:

		Optional, Bool.

		Support creating mappings in the page-table before Stage 1 translation is

		enabled.

- qcom,iommu-dma-addr-pool:

		Optional, tuple of <address size>.

		Defaults to <0, SZ_4G> if not present.

		Indicates the range of addresses that the dma layer will use.

** Examples:

        /* SMMU with stream matching or stream indexing */

			 <&mmcc SMMU_MDP_AHB_CLK>;

		clock-names = "bus", "iface";

	};

* Qualcomm Technologies, Inc. MMU-500 TBU Device

The qcom,qsmmu-v500 device implements a number of register regions containing

debug functionality. Each register region maps to a separate tbu from the

arm mmu-500 implementation.

** TBU required properties:

- compatible    : Should be one of:

                        "qcom,qsmmuv500-tbu"

- reg           : Base address and size.

- reg-names	: "base" and "status-reg" are expected

		"base" is the main TBU register region.

		"status-reg" indicates whether hw can process a new request.

-qcom,stream-id-range:

		Pair of values describing the smallest supported stream-id

		and the size of the entire set.

Example:

smmu {

	compatible = "qcom,qsmmu-v500";

	tbu@0x1000 {

		compatible = "qcom,qsmmuv500-tbu";

		regs = <0x1000 0x1000>,

			<0x2000 0x8>;

		reg-names = "base",

			"status-reg";

		qcom,stream-id-range = <0x800 0x400>;

	};

};

%YAML 1.2

---

$id: "http://devicetree.org/schemas/iommu/iommu-debug-test.yaml#"

$schema: "http://devicetree.org/meta-schemas/core.yaml#"

title: IOMMU Debugging and Testing Framework binding

maintainers:

  - Isaac J. Manjarres <isaacm@quicinc.com>

description: |

  The IOMMU Debugging and Testing Framework is used for collecting information

  that is useful for debugging/instrumenting the IOMMU framework code, as well

  as testing various IOMMU related features.

properties:

  compatible:

    items:

      - const: iommu-debug-test

  iommus:

    minItems: 1

    items:

      - description: IOMMU specifier with a SID and an SMR mask

    description:

      The SID in the IOMMU specifier is a placeholder so that the SMMU driver

      can recognize the node. Our test uses ATOS, which doesn't use SIDs anyway,

      so using a dummy value is ok.

required:

  - compatible

  - iommus

examples:

  - |

    iommu_test_device {

        compatible = "iommu-debug-test";

        iommus = <&cpp_fd_smmu 42>;

    };

%YAML 1.2

---

$id: "http://devicetree.org/schemas/soc/qcom/qcom,secure-buffer.yaml#"

$schema: "http://devicetree.org/meta-schemas/core.yaml#"

title: Qualcomm Technologies, Inc. Secure Buffer binding

maintainers:

  - Isaac J. Manjarres <isaacm@quicinc.com>

description: |

  The Secure Buffer driver is used to communicate with the ARMv8

  secure world (EL2 and EL3) to secure a buffer, so that only the

  correct clients can use the buffer, and no other entities can

  access it.

properties:

  compatible:

    items:

      - const: qcom,secure-buffer

required:

  - compatible

examples:

  - |

    qcom,secure-buffer {

        compatible = "qcom,secure-buffer";

    };