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-rw-r--r--Documentation/devicetree/bindings/dma/snps-dma.txt44
1 files changed, 44 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/dma/snps-dma.txt b/Documentation/devicetree/bindings/dma/snps-dma.txt
index c0d85dbcada..5bb3dfb6f1d 100644
--- a/Documentation/devicetree/bindings/dma/snps-dma.txt
+++ b/Documentation/devicetree/bindings/dma/snps-dma.txt
@@ -6,6 +6,26 @@ Required properties:
- interrupt-parent: Should be the phandle for the interrupt controller
that services interrupts for this device
- interrupt: Should contain the DMAC interrupt number
+- nr_channels: Number of channels supported by hardware
+- is_private: The device channels should be marked as private and not for by the
+ general purpose DMA channel allocator. False if not passed.
+- chan_allocation_order: order of allocation of channel, 0 (default): ascending,
+ 1: descending
+- chan_priority: priority of channels. 0 (default): increase from chan 0->n, 1:
+ increase from chan n->0
+- block_size: Maximum block size supported by the controller
+- nr_masters: Number of AHB masters supported by the controller
+- data_width: Maximum data width supported by hardware per AHB master
+ (0 - 8bits, 1 - 16bits, ..., 5 - 256bits)
+- slave_info:
+ - bus_id: name of this device channel, not just a device name since
+ devices may have more than one channel e.g. "foo_tx". For using the
+ dw_generic_filter(), slave drivers must pass exactly this string as
+ param to filter function.
+ - cfg_hi: Platform-specific initializer for the CFG_HI register
+ - cfg_lo: Platform-specific initializer for the CFG_LO register
+ - src_master: src master for transfers on allocated channel.
+ - dst_master: dest master for transfers on allocated channel.
Example:
@@ -14,4 +34,28 @@ Example:
reg = <0xfc000000 0x1000>;
interrupt-parent = <&vic1>;
interrupts = <12>;
+
+ nr_channels = <8>;
+ chan_allocation_order = <1>;
+ chan_priority = <1>;
+ block_size = <0xfff>;
+ nr_masters = <2>;
+ data_width = <3 3 0 0>;
+
+ slave_info {
+ uart0-tx {
+ bus_id = "uart0-tx";
+ cfg_hi = <0x4000>; /* 0x8 << 11 */
+ cfg_lo = <0>;
+ src_master = <0>;
+ dst_master = <1>;
+ };
+ spi0-tx {
+ bus_id = "spi0-tx";
+ cfg_hi = <0x2000>; /* 0x4 << 11 */
+ cfg_lo = <0>;
+ src_master = <0>;
+ dst_master = <0>;
+ };
+ };
};