[PATCH v2 1/5] dt-bindings: Document the STM32 DMAMUX bindings
From: Pierre-Yves MORDRET <hidden>
Date: 2017-06-23 13:05:20
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 documentation of device tree bindings for the STM32
DMAMUX.
Signed-off-by: M'boumba Cedric Madianga <redacted>
Signed-off-by: Pierre-Yves MORDRET <redacted>
---
Version history:
v2:
* Move clock bindings from optional to mandatory one
* Drop channelID bindings as managed dynamically from now on by
DMAMUX driver.
---
---
.../devicetree/bindings/dma/stm32-dmamux.txt | 57 ++++++++++++++++++++++
1 file changed, 57 insertions(+)
create mode 100644 Documentation/devicetree/bindings/dma/stm32-dmamux.txt
diff --git a/Documentation/devicetree/bindings/dma/stm32-dmamux.txt b/Documentation/devicetree/bindings/dma/stm32-dmamux.txt
new file mode 100644
index 0000000..1d413c5
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/stm32-dmamux.txt@@ -0,0 +1,57 @@ +STM32 DMA MUX (DMA request router) + +Required properties: +- compatible: "st,stm32-dmamux" +- reg: Memory map for accessing module +- #dma-cells: Should be set to <3>. + For more details about the three cells, please see + stm32-dma.txt documentation binding file +- dma-masters: Phandle pointing to the DMA controller + +Optional properties: +- dma-channels : Number of DMA channels supported. +- dma-requests : Number of DMA requests supported. +- resets: Reference to a reset controller asserting the DMA controller +- clocks: Input clock of the DMAMUX instance. + +Example: + +/* DMA controller */ +dma2: dma-controller at 40026400 { + compatible = "st,stm32-dma"; + reg = <0x40026400 0x400>; + interrupts = <56>, + <57>, + <58>, + <59>, + <60>, + <68>, + <69>, + <70>; + clocks = <&clk_hclk>; + #dma-cells = <4>; + st,mem2mem; + resets = <&rcc 150>; + st,dmamux; + dma-channels = <8>; +}; + +/* DMA mux */ +dmamux2: dma-router at 40020820 { + compatible = "st,stm32-dmamux"; + reg = <0x40020800 0x1c>; + #dma-cells = <3>; + dma-requests = <128>; + dma-masters = <&dma2>; +}; + +/* DMA client */ +usart1: serial at 40011000 { + compatible = "st,stm32-usart", "st,stm32-uart"; + reg = <0x40011000 0x400>; + interrupts = <37>; + clocks = <&clk_pclk2>; + dmas = <&dmamux2 41 0x414 0>, + <&dmamux2 42 0x414 0>; + dma-names = "rx", "tx"; +};
--
1.9.1