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Message-Id: <1421838071-7347-4-git-send-email-rsahu@apm.com>
Date: Wed, 21 Jan 2015 16:31:11 +0530
From: Rameshwar Prasad Sahu <rsahu@....com>
To: vinod.koul@...el.com, dan.j.williams@...el.com
Cc: dmaengine@...r.kernel.org, arnd@...db.de,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, ddutile@...hat.com,
jcm@...hat.com, patches@....com,
Rameshwar Prasad Sahu <rsahu@....com>, Loc Ho <lho@....com>
Subject: [PATCH v4 3/3] Documentation: dma: Add APM X-Gene SoC DMA engine driver documentation
This patch adds device tree binding for APM X-Gene SoC DMA engine driver.
Signed-off-by: Rameshwar Prasad Sahu <rsahu@....com>
Signed-off-by: Loc Ho <lho@....com>
---
.../devicetree/bindings/dma/apm-xgene-dma.txt | 49 ++++++++++++++++++++++
1 file changed, 49 insertions(+)
create mode 100644 Documentation/devicetree/bindings/dma/apm-xgene-dma.txt
diff --git a/Documentation/devicetree/bindings/dma/apm-xgene-dma.txt b/Documentation/devicetree/bindings/dma/apm-xgene-dma.txt
new file mode 100644
index 0000000..c661cc6
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/apm-xgene-dma.txt
@@ -0,0 +1,49 @@
+Applied Micro X-Gene SoC DMA nodes
+
+DMA nodes are defined to describe on-chip DMA interfaces in
+APM X-Gene SoC.
+
+Required properties for DMA interfaces:
+- compatible: Should be "apm,xgene-dma".
+- device_type: set to "dma".
+- reg: Address and length of the register set for the device.
+ It contains the information of registers in the same order
+ as described by reg-names.
+- reg-names: Should contain the register set names.
+ - "dma_csr": DMA control and status register address space.
+ - "ring_csr": Descriptor ring control and status register
+ address space.
+ - "ring_cmd": Descriptor ring command register address space.
+- interrupts: DMA has 5 interrupts sources. 1st interrupt is
+ DMA error reporting interrupt. 2nd, 3rd, 4th and 5th interrupts
+ are completion interrupts for each DMA channels.
+- clocks: Reference to the clock entry.
+
+Optional properties:
+- dma-coherent : Present if dma operations are coherent
+
+Example:
+ dmaclk: dmaclk@...7c000 {
+ compatible = "apm,xgene-device-clock";
+ #clock-cells = <1>;
+ clocks = <&socplldiv2 0>;
+ reg = <0x0 0x1f27c000 0x0 0x1000>;
+ reg-names = "csr-reg";
+ clock-output-names = "dmaclk";
+ };
+
+ dma: dma@...70000 {
+ compatible = "apm,xgene-dma";
+ device_type = "dma";
+ reg = <0x0 0x1f270000 0x0 0x10000>,
+ <0x0 0x1f200000 0x0 0x10000>,
+ <0x0 0x1b008000 0x0 0x2000>;
+ reg-names = "dma_csr", "ring_csr", "ring_cmd";
+ interrupts = <0x0 0xb8 0x4>,
+ <0x0 0xb9 0x4>,
+ <0x0 0xba 0x4>,
+ <0x0 0xbb 0x4>,
+ <0x0 0x82 0x4>;
+ dma-coherent;
+ clocks = <&dmaclk 0>;
+ };
--
1.8.2.1
--
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