ASoC: rockchip: add 'rockchip,no-dmaengine' for i2s/tdm/pdm

This patch add support for property 'rockchip,no-dmaengine'.
it is a boolean property. if present, driver will do not
register pcm dmaengine, only just register dai. if the dai
is part of multi-dais, the property should be present. Please
refer to rockchip,multidais.txt about multi-dais usage.

Change-Id: I9aa2ddb15f5a27202f90bf32804f214435cc0b73
Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>

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

@@ -16,6 +16,10 @@ Required properties:
    - "pdm_clk" : clock for PDM controller
 - resets: a list of phandle + reset-specifer paris, one for each entry in reset-names.
 - reset-names: reset names, should include "pdm-m".
+- rockchip,no-dmaengine: This is a boolean property. If present, driver will do not
+  register pcm dmaengine, only just register dai. if the dai is part of multi-dais,
+  the property should be present. Please refer to rockchip,multidais.txt about
+  multi-dais usage.
 - pinctrl-names: Must contain a "default" entry.
 - pinctrl-N: One property must exist for each entry in
 	     pinctrl-names. See ../pinctrl/pinctrl-bindings.txt

Documentation/devicetree/bindings/sound/rockchip-i2s.txt

@@ -30,6 +30,10 @@ Required properties:
 - rockchip,playback-channels: max playback channels, if not set, 8 channels default.
 - rockchip,capture-channels: max capture channels, if not set, 2 channels default.
 - rockchip,bclk-fs: configure the i2s bclk fs.
+- rockchip,no-dmaengine: This is a boolean property. If present, driver will do not
+  register pcm dmaengine, only just register dai. if the dai is part of multi-dais,
+  the property should be present. Please refer to rockchip,multidais.txt about
+  multi-dais usage.
 
 Required properties for controller which support multi channels
 playback/capture:

sound/soc/rockchip/rockchip_i2s.c

@@ -704,6 +704,8 @@ static int rockchip_i2s_probe(struct platform_device *pdev)
 		goto err_suspend;
 	}
 
+	if (of_property_read_bool(node, "rockchip,no-dmaengine"))
+		return ret;
 	ret = rockchip_pcm_platform_register(&pdev->dev);
 	if (ret) {
 		dev_err(&pdev->dev, "Could not register PCM\n");

sound/soc/rockchip/rockchip_pdm.c

@@ -465,6 +465,7 @@ MODULE_DEVICE_TABLE(of, rockchip_pdm_match);
 
 static int rockchip_pdm_probe(struct platform_device *pdev)
 {
+	struct device_node *node = pdev->dev.of_node;
 	const struct of_device_id *match;
 	struct rk_pdm_dev *pdm;
 	struct resource *res;
@@ -531,6 +532,8 @@ static int rockchip_pdm_probe(struct platform_device *pdev)
 	}
 
 	rockchip_pdm_rxctrl(pdm, 0);
+	if (of_property_read_bool(node, "rockchip,no-dmaengine"))
+		return ret;
 	ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
 	if (ret) {
 		dev_err(&pdev->dev, "could not register pcm: %d\n", ret);