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ARM: dts: pl330: Add #dma-cells for generic dma binding support 

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 <padma.v@samsung.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
hifive-unleashed-5.1
Padmavathi Venna 2013-02-14 09:10:08 +05:30 committed by Vinod Koul
parent 421da89aad
commit 42cf20980c
2 changed files with 28 additions and 5 deletions
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21
Documentation/devicetree/bindings/dma/arm-pl330.txt
View File

@ -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";

12
arch/arm/boot/dts/exynos5250.dtsi
View File

@ -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>;
};
};