linux-kernel - [PATCH v7 1/5] dt-bindings: iommu: Add binding for mediatek IOMMU

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Date:	Fri, 18 Dec 2015 16:09:39 +0800
From:	Yong Wu <yong.wu@...iatek.com>
To:	Joerg Roedel <joro@...tes.org>,
	Thierry Reding <treding@...dia.com>,
	Mark Rutland <mark.rutland@....com>,
	Matthias Brugger <matthias.bgg@...il.com>
CC:	Robin Murphy <robin.murphy@....com>,
	Will Deacon <will.deacon@....com>,
	Daniel Kurtz <djkurtz@...gle.com>,
	Tomasz Figa <tfiga@...gle.com>,
	Lucas Stach <l.stach@...gutronix.de>,
	Rob Herring <robh+dt@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	<linux-mediatek@...ts.infradead.org>,
	Sasha Hauer <kernel@...gutronix.de>,
	<srv_heupstream@...iatek.com>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<iommu@...ts.linux-foundation.org>, <pebolle@...cali.nl>,
	<arnd@...db.de>, <mitchelh@...eaurora.org>,
	<p.zabel@...gutronix.de>, <youhua.li@...iatek.com>,
	<k.zhang@...iatek.com>, <kendrick.hsu@...iatek.com>,
	Yong Wu <yong.wu@...iatek.com>
Subject: [PATCH v7 1/5] dt-bindings: iommu: Add binding for mediatek IOMMU

This patch add mediatek iommu dts binding document.

Signed-off-by: Yong Wu <yong.wu@...iatek.com>
---
 .../devicetree/bindings/iommu/mediatek,iommu.txt   | 68 ++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iommu/mediatek,iommu.txt

diff --git a/Documentation/devicetree/bindings/iommu/mediatek,iommu.txt b/Documentation/devicetree/bindings/iommu/mediatek,iommu.txt
new file mode 100644
index 0000000..c2fb06e
--- /dev/null
+++ b/Documentation/devicetree/bindings/iommu/mediatek,iommu.txt
@@ -0,0 +1,68 @@
+* Mediatek IOMMU Architecture Implementation
+
+  Some Mediatek SOCs contain a Multimedia Memory Management Unit (M4U) which
+uses the ARM Short-Descriptor translation table format for address translation.
+
+  About the M4U Hardware Block Diagram, please check below:
+
+              EMI (External Memory Interface)
+               |
+              m4u (Multimedia Memory Management Unit)
+               |
+           SMI Common(Smart Multimedia Interface Common)
+               |
+       +----------------+-------
+       |                |
+       |                |
+   SMI larb0        SMI larb1   ... SoCs have several SMI local arbiter(larb).
+   (display)         (vdec)
+       |                |
+       |                |
+ +-----+-----+     +----+----+
+ |     |     |     |    |    |
+ |     |     |...  |    |    |  ... There are different ports in each larb.
+ |     |     |     |    |    |
+OVL0 RDMA0 WDMA0  MC   PP   VLD
+
+  As above, The Multimedia HW will go through SMI and M4U while it
+access EMI. SMI is a brige between m4u and the Multimedia HW. It contain
+smi local arbiter and smi common. It will control whether the Multimedia
+HW should go though the m4u for translation or bypass it and talk
+directly with EMI. And also SMI help control the power domain and clocks for
+each local arbiter.
+  Normally we specify a local arbiter(larb) for each multimedia HW
+like display, video decode, and camera. And there are different ports
+in each larb. Take a example, There are many ports like MC, PP, VLD in the
+video decode local arbiter, all these ports are according to the video HW.
+
+Required properties:
+- compatible : must be "mediatek,mt8173-m4u".
+- reg : m4u register base and size.
+- interrupts : the interrupt of m4u.
+- clocks : must contain one entry for each clock-names.
+- clock-names : must be "bclk", It is the block clock of m4u.
+- mediatek,larbs : List of phandle to the local arbiters in the current Socs.
+	Refer to bindings/memory-controllers/mediatek,smi-larb.txt. It must sort
+	according to the local arbiter index, like larb0, larb1, larb2...
+- iommu-cells : must be 1. This is the mtk_m4u_id according to the HW.
+	Specifies the mtk_m4u_id as defined in
+	dt-binding/memory/mt8173-larb-port.h.
+
+Example:
+	iommu: iommu@...05000 {
+		compatible = "mediatek,mt8173-m4u";
+		reg = <0 0x10205000 0 0x1000>;
+		interrupts = <GIC_SPI 139 IRQ_TYPE_LEVEL_LOW>;
+		clocks = <&infracfg CLK_INFRA_M4U>;
+		clock-names = "bclk";
+		mediatek,larbs = <&larb0 &larb1 &larb2 &larb3 &larb4 &larb5>;
+		#iommu-cells = <1>;
+	};
+
+Example for a client device:
+	display {
+		compatible = "mediatek,mt8173-disp";
+		iommus = <&iommu M4U_PORT_DISP_OVL0>,
+			 <&iommu M4U_PORT_DISP_RDMA0>;
+		...
+	};
-- 
1.8.1.1.dirty

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