Documentation/devicetree/bindings/sound/rockchip,pdm.txt

   1 * Rockchip PDM controller
   2
   3 Required 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
  20 Example for rk3328 PDM controller:
  21
  22 pdm: 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 };