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Date: Thu, 8 Oct 2015 15:45:46 +0800
From: Chen Feng <puck.chen@...ilicon.com>
To: <puck.chen@...ilicon.com>, <joro@...tes.org>,
<iommu@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>,
<robh+dt@...nel.org>, <pawel.moll@....com>,
<haojian.zhuang@...aro.org>, <devicetree@...r.kernel.org>,
<xuwei5@...ilicon.com>, <xuyiping@...ilicon.com>, <w.f@...wei.com>,
<kong.kongxinwei@...ilicon.com>, <z.liuxinliang@...ilicon.com>,
<yudongbin@...ilicon.com>, <weidong2@...ilicon.com>,
<saberlily.xia@...ilicon.com>
CC: <linuxarm@...wei.com>, <dan.zhao@...ilicon.com>,
<peter.panshilin@...ilicon.com>, <qijiwen@...ilicon.com>
Subject: [PATCH 1/3] docs: dts: Documentation for smmu in hi6220 SoC.
Documentation for system mmu in hi6220 platform.
Signed-off-by: Chen Feng <puck.chen@...ilicon.com>
Signed-off-by: Yu Dongbin <yudongbin@...ilicon.com>
---
.../bindings/iommu/hisi,hi6220-iommu.txt | 52 ++++++++++++++++++++++
1 file changed, 52 insertions(+)
create mode 100644 Documentation/devicetree/bindings/iommu/hisi,hi6220-iommu.txt
diff --git a/Documentation/devicetree/bindings/iommu/hisi,hi6220-iommu.txt b/Documentation/devicetree/bindings/iommu/hisi,hi6220-iommu.txt
new file mode 100644
index 0000000..32d1156
--- /dev/null
+++ b/Documentation/devicetree/bindings/iommu/hisi,hi6220-iommu.txt
@@ -0,0 +1,52 @@
+Hi6220 SoC SMMU Device Driver devicetree document
+=======================================================================
+The Architecture of SMMU on Hi6220 SoC:
+
+ +------------------------------------------------------------------+
+ | |
+ | +---------+ +--------+ +-------------+ +-------+ |
+ | | ADE | | ISP | | V/J codec | | G3D | |
+ | +----|----+ +---|----+ +------|------+ +---|---| |
+ | | | | | |
+ | ---------v-----------v--------------v--------------v----- |
+ | Media Bus |
+ | --------------------------------|---------------|-------- |
+ | | | |
+ | +---v---------------v--------+ |
+ | | SMMU | |
+ | +----------|---------|-------+ |
+ | | | |
+ +--------------------------------------------|---------|-----------+
+ | |
+ +------------v---------v-----------+
+ | DDRC |
+ +----------------------------------+
+
+Note:
+The media system shared the same smmu IP. to access DDR memory. And all
+media IP used the same page table.
+
+Below binding describes the system mmu for media system in hi6220 platform
+
+Required properties:
+- compatible: Should be "hisilicon,hi6220-smmu" example:
+ compatible = "hisilicon,hi6220-smmu";
+- reg: A tuple of base address and size of System MMU registers.
+- interrupts: An interrupt specifier for interrupt signal of System MMU.
+- clocks: The clock used for smmu IP.
+- clock-names: The name to enable clock with clock framework.
+- #iommu-cells: The iommu-cells should be 1 for muti-master to use.
+
+Examples:
+ smmu@...10000 {
+ compatible = "hisilicon,hi6220-smmu";
+ reg = <0x0 0xf4210000 0x0 0x1000>;
+ interrupts = <GIC_SPI 113 IRQ_TYPE_LEVEL_HIGH>;
+ clocks = <&sys_ctrl HI6220_MMU_CLK>,
+ <&media_ctrl HI6220_MED_MMU>,
+ <&sys_ctrl HI6220_MEDIA_PLL_SRC>;
+ clock-names = "smmu_clk",
+ "media_sc_clk",
+ "smmu_peri_clk";
+ #iommu-cells = <1>;
+ };
--
1.9.1
--
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