[PATCH 2/7] dmaengine: st_fdma: Add STMicroelectronics FDMA xbar DT binding documentation
From: peter.griffin@linaro.org (Peter Griffin)
Date: 2015-07-08 16:13:26
Also in:
linux-devicetree, lkml
Subsystem:
dma generic offload engine subsystem, open firmware and flattened device tree bindings, the rest · Maintainers:
Vinod Koul, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
This patch adds the DT binding documentation for the FDMA xbar hw found on STi based chipsets from STMicroelectronics. Signed-off-by: Ludovic Barre <redacted> Signed-off-by: Peter Griffin <peter.griffin@linaro.org> --- Documentation/devicetree/bindings/dma/st_fdma.txt | 24 +++++++++++++++++++++++ 1 file changed, 24 insertions(+)
diff --git a/Documentation/devicetree/bindings/dma/st_fdma.txt b/Documentation/devicetree/bindings/dma/st_fdma.txt
index 1ec7470..655ee57 100644
--- a/Documentation/devicetree/bindings/dma/st_fdma.txt
+++ b/Documentation/devicetree/bindings/dma/st_fdma.txt@@ -3,6 +3,24 @@ The FDMA is a general-purpose direct memory access controller capable of supporting 16 independent DMA channels. It accepts up to 32 DMA requests. The FDMA is based on a Slim processor which require a firmware. +To increase the number of peripheral request, the FDMA crossbar can mutiplex +up to 96 peripheral requests to one of 3 fdma controlers engine. + +* FDMA crossbar + +Required properties: +- compatible : Should be "st,fdma-xbar-1.0" +- reg : Should contain XBAR registers location and length +- dma-requests : Should contain the number of peripheral request supported +- #st,fdma-xbar-cells : Must be <1> + +Example: + xbar0: fdma-xbar-mpe at 0 { + compatible = "st,fdma-xbar-1.0"; + reg = <0x8e80000 0x1000>; + dma-requests = <79>; + #st,fdma-xbar-cells = <1>; + }; * FDMA Controller
@@ -18,6 +36,11 @@ Required properties: See: Documentation/devicetree/bindings/clock/clock-bindings.txt +Optional properties: +- st,fdma-xbar : Allow to plug controller behind the crossbar at offset X + 1. A phandle pointing to the FDMA crossbar + 2. Output offset <2..0> + Example: fdma1: fdma-app at 1 {
@@ -26,6 +49,7 @@ Example: interrupts = <GIC_SPI 7 IRQ_TYPE_NONE>; dma-channels = <16>; #dma-cells = <3>; + st,fdma-xbar = <&xbar0 0>; st,fw-name = "fdma_STiH407_1.elf"; clocks = <&CLK_S_C0_FLEXGEN CLK_FDMA>, <&CLK_S_C0_FLEXGEN CLK_TX_ICN_DMU>,
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1.9.1