From mboxrd@z Thu Jan 1 00:00:00 1970 From: Laurent Pinchart Subject: [PATCH v2 2/5] iommu/ipmmu-vmsa: Add device tree bindings documentation Date: Thu, 17 Apr 2014 13:12:21 +0200 Message-ID: <2988506.LxGglp6hxV@avalon> References: <1397730807-5993-1-git-send-email-laurent.pinchart+renesas@ideasonboard.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7Bit Return-path: In-Reply-To: <1397730807-5993-1-git-send-email-laurent.pinchart+renesas@ideasonboard.com> Sender: linux-sh-owner@vger.kernel.org To: iommu@lists.linux-foundation.org Cc: linux-sh@vger.kernel.org, devicetree@vger.kernel.org, Will Deacon List-Id: devicetree@vger.kernel.org Cc: devicetree@vger.kernel.org Cc: Will Deacon Signed-off-by: Laurent Pinchart --- .../bindings/iommu/renesas,ipmmu-vmsa.txt | 35 ++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 Documentation/devicetree/bindings/iommu/renesas,ipmmu-vmsa.txt diff --git a/Documentation/devicetree/bindings/iommu/renesas,ipmmu-vmsa.txt b/Documentation/devicetree/bindings/iommu/renesas,ipmmu-vmsa.txt new file mode 100644 index 0000000..2b16a75 --- /dev/null +++ b/Documentation/devicetree/bindings/iommu/renesas,ipmmu-vmsa.txt @@ -0,0 +1,35 @@ +* Renesas VMSA-Compatible IOMMU + +The IPMMU is an IOMMU implementation compatible with the ARM VMSA page tables. +It provides address translation for bus masters outside of the CPU, each +connected to the IPMMU through a port called micro-TLB. + + +Required Properties: + + - compatible: Must contain "renesas,ipmmu-vmsa". + - reg: Base address and size of the IPMMU registers. + - interrupts: Specifier for the MMU fault interrupt. + + +Each bus master connected to an IPMMU must reference the IPMMU in its device +node with the following property: + + - iommus: A reference to the IPMMU in two cells. The first cell is a phandle + to the IPMMU and the second cell the number of the micro-TLB that the + device is connected to. + + +Example: R8A7791 IPMMU-MX and VSP1-D0 bus master + + ipmmu_mx: mmu@fe951800 { + compatible = "renasas,ipmmu-vmsa"; + reg = <0 0xfe951800 0 0x800>; + interrupts = <0 222 IRQ_TYPE_LEVEL_HIGH>; + }; + + vsp1@fe928000 { + ... + iommus = <&ipmmu_mx 13>; + ... + }; -- 1.8.3.2