1STM32 DMA MUX (DMA request router)
2
3Required properties:
4- compatible:	"st,stm32h7-dmamux"
5- reg:		Memory map for accessing module
6- #dma-cells:	Should be set to <3>.
7		First parameter is request line number.
8		Second is DMA channel configuration
9		Third is Fifo threshold
10		For more details about the three cells, please see
11		stm32-dma.txt documentation binding file
12- dma-masters:	Phandle pointing to the DMA controllers.
13		Several controllers are allowed. Only "st,stm32-dma" DMA
14		compatible are supported.
15
16Optional properties:
17- dma-channels : Number of DMA requests supported.
18- dma-requests : Number of DMAMUX requests supported.
19- resets: Reference to a reset controller asserting the DMA controller
20- clocks: Input clock of the DMAMUX instance.
21
22Example:
23
24/* DMA controller 1 */
25dma1: dma-controller@40020000 {
26	compatible = "st,stm32-dma";
27	reg = <0x40020000 0x400>;
28	interrupts = <11>,
29		     <12>,
30		     <13>,
31		     <14>,
32		     <15>,
33		     <16>,
34		     <17>,
35		     <47>;
36	clocks = <&timer_clk>;
37	#dma-cells = <4>;
38	st,mem2mem;
39	resets = <&rcc 150>;
40	dma-channels = <8>;
41	dma-requests = <8>;
42};
43
44/* DMA controller 1 */
45dma2: dma@40020400 {
46	compatible = "st,stm32-dma";
47	reg = <0x40020400 0x400>;
48	interrupts = <56>,
49		     <57>,
50		     <58>,
51		     <59>,
52		     <60>,
53		     <68>,
54		     <69>,
55		     <70>;
56	clocks = <&timer_clk>;
57	#dma-cells = <4>;
58	st,mem2mem;
59	resets = <&rcc 150>;
60	dma-channels = <8>;
61	dma-requests = <8>;
62};
63
64/* DMA mux */
65dmamux1: dma-router@40020800 {
66	compatible = "st,stm32h7-dmamux";
67	reg = <0x40020800 0x3c>;
68	#dma-cells = <3>;
69	dma-requests = <128>;
70	dma-channels = <16>;
71	dma-masters = <&dma1 &dma2>;
72	clocks = <&timer_clk>;
73};
74
75/* DMA client */
76usart1: serial@40011000 {
77	compatible = "st,stm32-usart", "st,stm32-uart";
78	reg = <0x40011000 0x400>;
79	interrupts = <37>;
80	clocks = <&timer_clk>;
81	dmas = <&dmamux1 41 0x414 0>,
82	       <&dmamux1 42 0x414 0>;
83	dma-names = "rx", "tx";
84};
85