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