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>

diff --git a/Documentation/devicetree/bindings/sound/omap-mcbsp.txt b/Documentation/devicetree/bindings/sound/omap-mcbsp.txt
new file mode 100644 (file)
index 0000000..447cb13
--- /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 b9770ee..2e1750e 100644 (file)
--- 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,