This patch adds #dma-cells property to PL330 DMA controller
nodes for supporting generic dma dt bindings on samsung
exynos5250 platform.
Signed-off-by: Padmavathi Venna <padm...@samsung.com>
Acked-by: Arnd Bergmann <a...@arndb.de>
---
.../devicetree/bindings/dma/arm-pl330.txt | 21 +++++++++++++++----
arch/arm/boot/dts/exynos5250.dtsi | 12 +++++++++++
2 files changed, 28 insertions(+), 5 deletions(-)
diff --git a/Documentation/devicetree/bindings/dma/arm-pl330.txt
b/Documentation/devicetree/bindings/dma/arm-pl330.txt
index 36e27d5..2675658 100644
--- a/Documentation/devicetree/bindings/dma/arm-pl330.txt
+++ b/Documentation/devicetree/bindings/dma/arm-pl330.txt
@@ -10,7 +10,11 @@ Required properties:
- interrupts: interrupt number to the cpu.
Optional properties:
-- dma-coherent : Present if dma operations are coherent
+ - dma-coherent : Present if dma operations are coherent
+ - #dma-cells: must be <1>. used to represent the number of integer
+ cells in the dmas property of client device.
+ - dma-channels: contains the total number of DMA channels supported by the
DMAC
+ - dma-requests: contains the total number of DMA requests supported by the
DMAC
Example:
@@ -18,16 +22,23 @@ Example:
compatible = "arm,pl330", "arm,primecell";
reg = <0x12680000 0x1000>;
interrupts = <99>;
+ #dma-cells = <1>;
+ #dma-channels = <8>;
+ #dma-requests = <32>;
};
Client drivers (device nodes requiring dma transfers from dev-to-mem or
-mem-to-dev) should specify the DMA channel numbers using a two-value pair
+mem-to-dev) should specify the DMA channel numbers and dma channel names
as shown below.
[property name] = <[phandle of the dma controller] [dma request id]>;
+ [property name] = <[dma channel name]>
where 'dma request id' is the dma request number which is connected
- to the client controller. The 'property name' is recommended to be
- of the form <name>-dma-channel.
+ to the client controller. The 'property name' 'dmas' and 'dma-names'
+ as required by the generic dma device tree binding helpers. The dma
+ names correspond 1:1 with the dma request ids in the dmas property.
- Example: tx-dma-channel = <&pdma0 12>;
+ Example: dmas = <&pdma0 12
+ &pdma1 11>;
+ dma-names = "tx", "rx";
diff --git a/arch/arm/boot/dts/exynos5250.dtsi
b/arch/arm/boot/dts/exynos5250.dtsi
index 2e3b6ef..c774aae 100644
--- a/arch/arm/boot/dts/exynos5250.dtsi
+++ b/arch/arm/boot/dts/exynos5250.dtsi
@@ -280,24 +280,36 @@
compatible = "arm,pl330", "arm,primecell";
reg = <0x121A0000 0x1000>;
interrupts = <0 34 0>;
+ #dma-cells = <1>;
+ #dma-channels = <8>;
+ #dma-requests = <32>;
};
pdma1: pdma@121B0000 {
compatible = "arm,pl330", "arm,primecell";
reg = <0x121B0000 0x1000>;
interrupts = <0 35 0>;
+ #dma-cells = <1>;
+ #dma-channels = <8>;
+ #dma-requests = <32>;
};
mdma0: mdma@10800000 {
compatible = "arm,pl330", "arm,primecell";
reg = <0x10800000 0x1000>;
interrupts = <0 33 0>;
+ #dma-cells = <1>;
+ #dma-channels = <8>;
+ #dma-requests = <1>;
};
mdma1: mdma@11C10000 {
compatible = "arm,pl330", "arm,primecell";
reg = <0x11C10000 0x1000>;
interrupts = <0 124 0>;
+ #dma-cells = <1>;
+ #dma-channels = <8>;
+ #dma-requests = <1>;
};
};
--
1.7.4.4
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