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 <[email protected]>
> ---
>
> .../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.txt
> + for 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";
> +};
