ASoC: omap-mcbsp: Add device tree bindings

Device tree support for McBSP modules on OMAP2+ SoC.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

2 files changed, 110 insertions, 1 deletions

diff --git a/Documentation/devicetree/bindings/sound/omap-mcbsp.txt b/Documentation/devicetree/bindings/sound/omap-mcbsp.txt
new file mode 100644
index 000000000000..447cb131e909
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/omap-mcbsp.txt
@@ -0,0 +1,45 @@
+* Texas Instruments OMAP2+ McBSP module
+
+Required properties:
+- compatible: "ti,omap2420-mcbsp" for McBSP on OMAP2420
+              "ti,omap2430-mcbsp" for McBSP on OMAP2430
+              "ti,omap3-mcbsp" for McBSP on OMAP3
+              "ti,omap4-mcbsp" for McBSP on OMAP4 and newer SoC
+- reg: Register location and size, for OMAP4+ as an array:
+       <MPU access base address, size>,
+       <L3 interconnect address, size>;
+- interrupts: Interrupt numbers for the McBSP port, as an array in case the
+              McBSP IP have more interrupt lines:
+        <OCP compliant irq>,
+        <TX irq>,
+        <RX irq>;
+- interrupt-parent: The parent interrupt controller
+- ti,buffer-size: Size of the FIFO on the port (OMAP2430 and newer SoC)
+- ti,hwmods: Name of the hwmod associated to the McBSP port
+
+Sidetone support for OMAP3 McBSP2 and 3 ports:
+- sidetone { }: Within this section the following parameters are required:
+- reg: Register location and size for the ST block
+- interrupts: The interrupt number for the ST block
+- interrupt-parent: The parent interrupt controller for the ST block
+
+Example:
+
+mcbsp2: mcbsp@49022000 {
+        compatible = "ti,omap3-mcbsp";
+        #address-cells = <1>;
+        #size-cells = <1>;
+        reg = <0x49022000 0xff>;
+        interrupts = <0 17 0x4>, /* OCP compliant interrup */
+                     <0 62 0x4>, /* TX interrup */
+                     <0 63 0x4>; /* RX interrup */
+        interrupt-parent = <&intc>;
+        ti,buffer-size = <1280>;
+        ti,hwmods = "mcbsp2";
+
+        sidetone {
+                reg = <0x49028000 0xff>;
+                interrupts = <0 4 0x4>;
+                interrupt-parent = <&intc>;
+        };
+};
diff --git a/sound/soc/omap/omap-mcbsp.c b/sound/soc/omap/omap-mcbsp.c
index b9770eea28a0..2e1750e2ab31 100644
--- a/sound/soc/omap/omap-mcbsp.c
+++ b/sound/soc/omap/omap-mcbsp.c
@@ -26,6 +26,8 @@
 #include <linux/module.h>
 #include <linux/device.h>
 #include <linux/pm_runtime.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
@@ -737,13 +739,74 @@ int omap_mcbsp_st_add_controls(struct snd_soc_pcm_runtime *rtd)
 }
 EXPORT_SYMBOL_GPL(omap_mcbsp_st_add_controls);
 
+static struct omap_mcbsp_platform_data omap2420_pdata = {
+        .reg_step = 4,
+        .reg_size = 2,
+};
+
+static struct omap_mcbsp_platform_data omap2430_pdata = {
+        .reg_step = 4,
+        .reg_size = 4,
+        .has_ccr = true,
+};
+
+static struct omap_mcbsp_platform_data omap3_pdata = {
+        .reg_step = 4,
+        .reg_size = 4,
+        .has_ccr = true,
+        .has_wakeup = true,
+};
+
+static struct omap_mcbsp_platform_data omap4_pdata = {
+        .reg_step = 4,
+        .reg_size = 4,
+        .has_ccr = true,
+        .has_wakeup = true,
+};
+
+static const struct of_device_id omap_mcbsp_of_match[] = {
+        {
+                .compatible = "ti,omap2420-mcbsp",
+                .data = &omap2420_pdata,
+        },
+        {
+                .compatible = "ti,omap2430-mcbsp",
+                .data = &omap2430_pdata,
+        },
+        {
+                .compatible = "ti,omap3-mcbsp",
+                .data = &omap3_pdata,
+        },
+        {
+                .compatible = "ti,omap4-mcbsp",
+                .data = &omap4_pdata,
+        },
+        { },
+};
+MODULE_DEVICE_TABLE(of, omap_mcbsp_of_match);
+
 static __devinit int asoc_mcbsp_probe(struct platform_device *pdev)
 {
         struct omap_mcbsp_platform_data *pdata = dev_get_platdata(&pdev->dev);
         struct omap_mcbsp *mcbsp;
+        const struct of_device_id *match;
         int ret;
 
-        if (!pdata) {
+        match = of_match_device(omap_mcbsp_of_match, &pdev->dev);
+        if (match) {
+                struct device_node *node = pdev->dev.of_node;
+                int buffer_size;
+
+                pdata = devm_kzalloc(&pdev->dev,
+                                     sizeof(struct omap_mcbsp_platform_data),
+                                     GFP_KERNEL);
+                if (!pdata)
+                        return -ENOMEM;
+
+                memcpy(pdata, match->data, sizeof(*pdata));
+                if (!of_property_read_u32(node, "ti,buffer-size", &buffer_size))
+                        pdata->buffer_size = buffer_size;
+        } else if (!pdata) {
                 dev_err(&pdev->dev, "missing platform data.\n");
                 return -EINVAL;
         }
@@ -785,6 +848,7 @@ static struct platform_driver asoc_mcbsp_driver = {
         .driver = {
                         .name = "omap-mcbsp",
                         .owner = THIS_MODULE,
+                        .of_match_table = omap_mcbsp_of_match,
         },
 
         .probe = asoc_mcbsp_probe,