[PATCH V2 4/6] ASoC: Davinci: McASP: add device tree support for McASP
Hebbar, Gururaja
gururaja.hebbar at ti.com
Mon Aug 27 09:26:42 EDT 2012
Add device tree probe for McASP driver.
Note:
DMA parameters are not populated from DT and will be done later.
Signed-off-by: Hebbar, Gururaja <gururaja.hebbar at ti.com>
---
Changes from V1:
- add more explanation to DT parameters
- Dont return err if some DT parameters are missing. They will be
treated as 0.
- Through Error warning if num-serializer != "serial-dir" array size
:000000 100644 0000000... e6148ec... A Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt
:100644 100644 34ee2f1... c3eae1d... M sound/soc/davinci/davinci-mcasp.c
.../bindings/sound/davinci-mcasp-audio.txt | 44 +++++++
sound/soc/davinci/davinci-mcasp.c | 124 +++++++++++++++++++-
2 files changed, 167 insertions(+), 1 deletions(-)
diff --git a/Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt b/Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt
new file mode 100644
index 0000000..e6148ec
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt
@@ -0,0 +1,44 @@
+Texas Instruments McASP controller
+
+Required properties:
+- compatible :
+ "ti,dm646x-mcasp-audio" : for DM646x platforms
+ "ti,da830-mcasp-audio" : for both DA830 & DA850 platforms
+
+- reg : Should contain McASP registers offset and length
+- interrupts : Interrupt number for McASP
+- op-mode : I2S/DIT ops mode.
+- tdm-slots : Slots for TDM operation.
+- num-serializer : Serializers used by McASP.
+- serial-dir : A list of serializer pin mode. The list number should be equal
+ to "num-serializer" parameter. Each entry is a number indication
+ serializer pin direction. (0 - INACTIVE, 1 - TX, 2 - RX)
+
+
+Optional properties:
+
+- ti,hwmods : Must be "mcasp<n>", n is controller instance starting 0
+- tx-num-evt : FIFO levels.
+- rx-num-evt : FIFO levels.
+- sram-size-playback : size of sram to be allocated during playback
+- sram-size-capture : size of sram to be allocated during capture
+
+Example:
+
+mcasp0: mcasp0 at 1d00000 {
+ compatible = "ti,da830-mcasp-audio";
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <0x100000 0x3000>;
+ interrupts = <82 83>;
+ op-mode = <0>; /* MCASP_IIS_MODE */
+ tdm-slots = <2>;
+ num-serializer = <16>;
+ serial-dir = <
+ 0 0 0 0 /* 0: INACTIVE, 1: TX, 2: RX */
+ 0 0 0 0
+ 0 0 0 1
+ 2 0 0 0 >;
+ tx-num-evt = <1>;
+ rx-num-evt = <1>;
+};
diff --git a/sound/soc/davinci/davinci-mcasp.c b/sound/soc/davinci/davinci-mcasp.c
index 34ee2f1..c3eae1d 100644
--- a/sound/soc/davinci/davinci-mcasp.c
+++ b/sound/soc/davinci/davinci-mcasp.c
@@ -22,6 +22,9 @@
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/pm_runtime.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/of_device.h>
#include <sound/core.h>
#include <sound/pcm.h>
@@ -862,6 +865,114 @@ static struct snd_soc_dai_driver davinci_mcasp_dai[] = {
};
+static const struct of_device_id mcasp_dt_ids[] = {
+ {
+ .compatible = "ti,dm646x-mcasp-audio",
+ .data = (void *)MCASP_VERSION_1,
+ },
+ {
+ .compatible = "ti,da830-mcasp-audio",
+ .data = (void *)MCASP_VERSION_2,
+ },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, mcasp_dt_ids);
+
+static struct snd_platform_data *davinci_mcasp_set_pdata_from_of(
+ struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct snd_platform_data *pdata = NULL;
+ const struct of_device_id *match =
+ of_match_device(of_match_ptr(mcasp_dt_ids), &pdev->dev);
+
+ const u32 *of_serial_dir32;
+ u8 *of_serial_dir;
+ u32 val;
+ int i, ret = 0;
+
+ if (pdev->dev.platform_data) {
+ pdata = pdev->dev.platform_data;
+ return pdata;
+ } else if (match) {
+ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata) {
+ ret = -ENOMEM;
+ goto nodata;
+ }
+ } else {
+ /* control shouldn't reach here. something is wrong */
+ ret = -EINVAL;
+ goto nodata;
+ }
+
+ if (match->data)
+ pdata->version = (u8)((int)match->data);
+
+ ret = of_property_read_u32(np, "op-mode", &val);
+ if (ret >= 0)
+ pdata->op_mode = val;
+
+ ret = of_property_read_u32(np, "tdm-slots", &val);
+ if (ret >= 0)
+ pdata->tdm_slots = val;
+
+ ret = of_property_read_u32(np, "num-serializer", &val);
+ if (ret >= 0)
+ pdata->num_serializer = val;
+
+ of_serial_dir32 = of_get_property(np, "serial-dir", &val);
+ val /= sizeof(u32);
+ if (val != pdata->num_serializer) {
+ dev_err(&pdev->dev,
+ "num-serializer(%d) != serial-dir size(%d)\n",
+ pdata->num_serializer, val);
+ ret = -EINVAL;
+ goto nodata;
+ }
+
+ if (of_serial_dir32) {
+ of_serial_dir = devm_kzalloc(&pdev->dev,
+ (sizeof(*of_serial_dir) * val),
+ GFP_KERNEL);
+ if (!of_serial_dir) {
+ ret = -ENOMEM;
+ goto nodata;
+ }
+
+ for (i = 0; i < pdata->num_serializer; i++)
+ of_serial_dir[i] = be32_to_cpup(&of_serial_dir32[i]);
+
+ pdata->serial_dir = of_serial_dir;
+ }
+
+ ret = of_property_read_u32(np, "tx-num-evt", &val);
+ if (ret >= 0)
+ pdata->txnumevt = val;
+
+ ret = of_property_read_u32(np, "rx-num-evt", &val);
+ if (ret >= 0)
+ pdata->rxnumevt = val;
+
+ ret = of_property_read_u32(np, "sram-size-playback", &val);
+ if (ret >= 0)
+ pdata->sram_size_playback = val;
+
+ ret = of_property_read_u32(np, "sram-size-capture", &val);
+ if (ret >= 0)
+ pdata->sram_size_capture = val;
+
+ return pdata;
+
+nodata:
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Error populating platform data, err %d\n",
+ ret);
+ pdata = NULL;
+ }
+ return pdata;
+}
+
static int davinci_mcasp_probe(struct platform_device *pdev)
{
struct davinci_pcm_dma_params *dma_data;
@@ -870,11 +981,22 @@ static int davinci_mcasp_probe(struct platform_device *pdev)
struct davinci_audio_dev *dev;
int ret;
+ if (!pdev->dev.platform_data && !pdev->dev.of_node) {
+ dev_err(&pdev->dev, "No platform data supplied\n");
+ return -EINVAL;
+ }
+
dev = devm_kzalloc(&pdev->dev, sizeof(struct davinci_audio_dev),
GFP_KERNEL);
if (!dev)
return -ENOMEM;
+ pdata = davinci_mcasp_set_pdata_from_of(pdev);
+ if (!pdata) {
+ dev_err(&pdev->dev, "no platform data\n");
+ return -EINVAL;
+ }
+
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!mem) {
dev_err(&pdev->dev, "no mem resource?\n");
@@ -888,7 +1010,6 @@ static int davinci_mcasp_probe(struct platform_device *pdev)
return -EBUSY;
}
- pdata = pdev->dev.platform_data;
pm_runtime_enable(&pdev->dev);
ret = pm_runtime_get_sync(&pdev->dev);
@@ -986,6 +1107,7 @@ static struct platform_driver davinci_mcasp_driver = {
.driver = {
.name = "davinci-mcasp",
.owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(mcasp_dt_ids),
},
};
--
1.7.1
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