2 files changed, 71 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/sound/imx-audmux.txt b/Documentation/devicetree/bindings/sound/imx-audmux.txt
index 215aa9817213..f88a00e54c63 100644
--- a/Documentation/devicetree/bindings/sound/imx-audmux.txt
+++ b/Documentation/devicetree/bindings/sound/imx-audmux.txt
@@ -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 {
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;
 }