1* Rockchip PDM controller
2
3Required properties:
4
5- compatible: "rockchip,pdm"
6  - "rockchip,px30-pdm"
7  - "rockchip,rk1808-pdm"
8  - "rockchip,rk3308-pdm"
9- reg: physical base address of the controller and length of memory mapped
10  region.
11- dmas: DMA specifiers for rx dma. See the DMA client binding,
12	Documentation/devicetree/bindings/dma/dma.txt
13- dma-names: should include "rx".
14- clocks: a list of phandle + clock-specifer pairs, one for each entry in clock-names.
15- clock-names: should contain following:
16   - "pdm_hclk": clock for PDM BUS
17   - "pdm_clk" : clock for PDM controller
18- resets: a list of phandle + reset-specifer paris, one for each entry in reset-names.
19- reset-names: reset names, should include "pdm-m".
20- pinctrl-names: Must contain a "default" entry.
21- pinctrl-N: One property must exist for each entry in
22	     pinctrl-names. See ../pinctrl/pinctrl-bindings.txt
23	     for details of the property values.
24
25Example for rk3328 PDM controller:
26
27pdm: pdm@ff040000 {
28	compatible = "rockchip,pdm";
29	reg = <0x0 0xff040000 0x0 0x1000>;
30	clocks = <&clk_pdm>, <&clk_gates28 0>;
31	clock-names = "pdm_clk", "pdm_hclk";
32	dmas = <&pdma 16>;
33	#dma-cells = <1>;
34	dma-names = "rx";
35	pinctrl-names = "default", "sleep";
36	pinctrl-0 = <&pdmm0_clk
37		     &pdmm0_sdi0
38		     &pdmm0_sdi1
39		     &pdmm0_sdi2
40		     &pdmm0_sdi3>;
41	pinctrl-1 = <&pdmm0_clk_sleep
42		     &pdmm0_sdi0_sleep
43		     &pdmm0_sdi1_sleep
44		     &pdmm0_sdi2_sleep
45		     &pdmm0_sdi3_sleep>;
46};
47