Commit 8548a464 authored by Markus Pargmann's avatar Markus Pargmann Committed by Mark Brown
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ASoC: imx-audmux: Read default configuration from devicetree 



Adds a function to parse a default port configuration from devicetree.

Signed-off-by: default avatarMarkus Pargmann <mpa@pengutronix.de>
Signed-off-by: default avatarMark Brown <broonie@linaro.org>
parent 3f1a91aa

Documentation/devicetree/bindings/sound/imx-audmux.txt

+9 −0
Original line number Diff line number Diff line
@@ -5,6 +5,15 @@ Required properties: 
  or "fsl,imx31-audmux" for the version firstly used on i.MX31.

- reg : Should contain AUDMUX registers location and length



An initial configuration can be setup using child nodes.



Required properties of optional child nodes:

- fsl,audmux-port : Integer of the audmux port that is configured by this

  child node.

- fsl,port-config : List of configuration options for the specific port. For

  imx31-audmux and above, it is a list of tuples <ptcr pdcr>. For

  imx21-audmux it is a list of pcr values.



Example:



audmux@021d8000 {

sound/soc/fsl/imx-audmux.c

+62 −0
Original line number Diff line number Diff line
@@ -251,6 +251,66 @@ int imx_audmux_v2_configure_port(unsigned int port, unsigned int ptcr, 
}

EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port);



static int imx_audmux_parse_dt_defaults(struct platform_device *pdev,

		struct device_node *of_node)

{

	struct device_node *child;



	for_each_available_child_of_node(of_node, child) {

		unsigned int port;

		unsigned int ptcr = 0;

		unsigned int pdcr = 0;

		unsigned int pcr = 0;

		unsigned int val;

		int ret;

		int i = 0;



		ret = of_property_read_u32(child, "fsl,audmux-port", &port);

		if (ret) {

			dev_warn(&pdev->dev, "Failed to get fsl,audmux-port of child node \"%s\"\n",

					child->full_name);

			continue;

		}

		if (!of_property_read_bool(child, "fsl,port-config")) {

			dev_warn(&pdev->dev, "child node \"%s\" does not have property fsl,port-config\n",

					child->full_name);

			continue;

		}



		for (i = 0; (ret = of_property_read_u32_index(child,

					"fsl,port-config\n", i, &val)) == 0;

				++i) {

			if (audmux_type == IMX31_AUDMUX) {

				if (i % 2)

					pdcr |= val;

				else

					ptcr |= val;

			} else {

				pcr |= val;

			}

		}



		if (ret != -ENODATA) {

			dev_err(&pdev->dev, "Failed to read u32 at index %d of child %s\n",

					i, child->full_name);

			continue;

		}



		if (audmux_type == IMX31_AUDMUX) {

			if (i % 2) {

				dev_err(&pdev->dev, "One pdcr value is missing in child node %s\n",

						child->full_name);

				continue;

			}

			imx_audmux_v2_configure_port(port, ptcr, pdcr);

		} else {

			imx_audmux_v1_configure_port(port, pcr);

		}

	}



	return 0;

}



static int imx_audmux_probe(struct platform_device *pdev)

{

	struct resource *res;
@@ -275,6 +335,8 @@ static int imx_audmux_probe(struct platform_device *pdev) 
	if (audmux_type == IMX31_AUDMUX)

		audmux_debugfs_init();



	imx_audmux_parse_dt_defaults(pdev, pdev->dev.of_node);



	return 0;

}