diff options
author | Sugar Zhang <sugar.zhang@rock-chips.com> | 2017-06-13 15:27:46 +0800 |
---|---|---|
committer | Mark Brown <broonie@kernel.org> | 2017-06-13 19:09:34 +0100 |
commit | fc05a5b222530617d99d0e803abb262130fdb0c4 (patch) | |
tree | 69454ef7d6f545d8113e7c2bfdbf9514ef43234b /Documentation/devicetree/bindings/sound/rockchip,pdm.txt | |
parent | 2ea659a9ef488125eb46da6eb571de5eae5c43f6 (diff) |
ASoC: rockchip: add support for pdm controller
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>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'Documentation/devicetree/bindings/sound/rockchip,pdm.txt')
-rw-r--r-- | Documentation/devicetree/bindings/sound/rockchip,pdm.txt | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/sound/rockchip,pdm.txt b/Documentation/devicetree/bindings/sound/rockchip,pdm.txt new file mode 100644 index 000000000000..921729de7346 --- /dev/null +++ b/Documentation/devicetree/bindings/sound/rockchip,pdm.txt @@ -0,0 +1,39 @@ +* Rockchip PDM controller + +Required properties: + +- compatible: "rockchip,pdm" +- 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"; +}; |