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ASoC: imx-audmux: Read default configuration from devicetree

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

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Markus Pargmann 2013-07-27 13:31:52 +02:00 committed by Mark Brown
parent 3f1a91aa25
commit 8548a464b9
2 changed files with 71 additions and 0 deletions
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9
Documentation/devicetree/bindings/sound/imx-audmux.txt
View file

@ -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 {

62
sound/soc/fsl/imx-audmux.c
View file

@ -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;
}