ASoC: imx-audmux: Read default configuration from devicetree

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>

1 files changed, 62 insertions, 0 deletions

diff --git a/sound/soc/fsl/imx-audmux.c b/sound/soc/fsl/imx-audmux.c
index 1a5da1e13077..103d1b020496 100644
--- a/sound/soc/fsl/imx-audmux.c
+++ b/sound/soc/fsl/imx-audmux.c
@@ -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;
 }