tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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};