On Tue, Jun 13, 2017 at 03:27:46PM +0800, Sugar Zhang wrote:
The Pulse Density Modulation Interface Controller (PDMC) is a PDM interface controller and decoder that support PDM format. It integrates a clock generator driving the PDM microphone and embeds filters which decimate the incoming bit stream to obtain most common audio rates.
Signed-off-by: Sugar Zhang sugar.zhang@rock-chips.com
.../devicetree/bindings/sound/rockchip,pdm.txt | 39 ++ sound/soc/rockchip/Kconfig | 9 + sound/soc/rockchip/Makefile | 2 + sound/soc/rockchip/rockchip_pdm.c | 516 +++++++++++++++++++++ sound/soc/rockchip/rockchip_pdm.h | 83 ++++ 5 files changed, 649 insertions(+) create mode 100644 Documentation/devicetree/bindings/sound/rockchip,pdm.txt create mode 100644 sound/soc/rockchip/rockchip_pdm.c create mode 100644 sound/soc/rockchip/rockchip_pdm.h
diff --git a/Documentation/devicetree/bindings/sound/rockchip,pdm.txt b/Documentation/devicetree/bindings/sound/rockchip,pdm.txt new file mode 100644 index 0000000..921729d --- /dev/null +++ b/Documentation/devicetree/bindings/sound/rockchip,pdm.txt @@ -0,0 +1,39 @@ +* Rockchip PDM controller
+Required properties:
+- compatible: "rockchip,pdm"
Too generic. This should be SoC specific.
+- reg: physical base address of the controller and length of memory mapped
- region.
+- dmas: DMA specifiers for rx dma. See the DMA client binding,
- Documentation/devicetree/bindings/dma/dma.txt
+- dma-names: should include "rx". +- clocks: a list of phandle + clock-specifer pairs, one for each entry in clock-names. +- clock-names: should contain following:
- "pdm_hclk": clock for PDM BUS
- "pdm_clk" : clock for PDM controller
+- pinctrl-names: Must contain a "default" entry. +- pinctrl-N: One property must exist for each entry in
pinctrl-names. See ../pinctrl/pinctrl-bindings.txtfor details of the property values.+Example for rk3328 PDM controller:
+pdm: pdm@ff040000 {
- compatible = "rockchip,pdm";
- reg = <0x0 0xff040000 0x0 0x1000>;
- clocks = <&clk_pdm>, <&clk_gates28 0>;
- clock-names = "pdm_clk", "pdm_hclk";
- dmas = <&pdma 16>;
- #dma-cells = <1>;
- dma-names = "rx";
- pinctrl-names = "default", "sleep";
- pinctrl-0 = <&pdmm0_clk
&pdmm0_fsync&pdmm0_sdi0&pdmm0_sdi1&pdmm0_sdi2&pdmm0_sdi3>;- pinctrl-1 = <&pdmm0_sleep>;
- status = "disabled";
+};