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d4e42e72e7
Update the IPMMU DT binding documentation to include the r8a7795 compat string as well as the "renesas,ipmmu-main" property that on r8a7795 will be used to describe the topology and the relationship between the various cache IPMMU instances and the main IPMMU. Signed-off-by: Magnus Damm <damm+renesas@opensource.se> Reviewed-by: Simon Horman <horms+renesas@verge.net.au> Signed-off-by: Joerg Roedel <jroedel@suse.de>
61 lines
2.2 KiB
Plaintext
61 lines
2.2 KiB
Plaintext
* Renesas VMSA-Compatible IOMMU
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The IPMMU is an IOMMU implementation compatible with the ARM VMSA page tables.
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It provides address translation for bus masters outside of the CPU, each
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connected to the IPMMU through a port called micro-TLB.
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Required Properties:
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- compatible: Must contain SoC-specific and generic entry below in case
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the device is compatible with the R-Car Gen2 VMSA-compatible IPMMU.
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- "renesas,ipmmu-r8a73a4" for the R8A73A4 (R-Mobile APE6) IPMMU.
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- "renesas,ipmmu-r8a7790" for the R8A7790 (R-Car H2) IPMMU.
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- "renesas,ipmmu-r8a7791" for the R8A7791 (R-Car M2-W) IPMMU.
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- "renesas,ipmmu-r8a7793" for the R8A7793 (R-Car M2-N) IPMMU.
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- "renesas,ipmmu-r8a7794" for the R8A7794 (R-Car E2) IPMMU.
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- "renesas,ipmmu-r8a7795" for the R8A7795 (R-Car H3) IPMMU.
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- "renesas,ipmmu-vmsa" for generic R-Car Gen2 VMSA-compatible IPMMU.
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- reg: Base address and size of the IPMMU registers.
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- interrupts: Specifiers for the MMU fault interrupts. For instances that
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support secure mode two interrupts must be specified, for non-secure and
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secure mode, in that order. For instances that don't support secure mode a
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single interrupt must be specified. Not required for cache IPMMUs.
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- #iommu-cells: Must be 1.
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Optional properties:
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- renesas,ipmmu-main: reference to the main IPMMU instance in two cells.
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The first cell is a phandle to the main IPMMU and the second cell is
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the interrupt bit number associated with the particular cache IPMMU device.
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The interrupt bit number needs to match the main IPMMU IMSSTR register.
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Only used by cache IPMMU instances.
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Each bus master connected to an IPMMU must reference the IPMMU in its device
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node with the following property:
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- iommus: A reference to the IPMMU in two cells. The first cell is a phandle
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to the IPMMU and the second cell the number of the micro-TLB that the
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device is connected to.
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Example: R8A7791 IPMMU-MX and VSP1-D0 bus master
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ipmmu_mx: mmu@fe951000 {
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compatible = "renasas,ipmmu-r8a7791", "renasas,ipmmu-vmsa";
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reg = <0 0xfe951000 0 0x1000>;
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interrupts = <0 222 IRQ_TYPE_LEVEL_HIGH>,
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<0 221 IRQ_TYPE_LEVEL_HIGH>;
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#iommu-cells = <1>;
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};
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vsp1@fe928000 {
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...
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iommus = <&ipmmu_mx 13>;
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...
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};
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