mfd: Add support for Device Tree to twl6040

Device tree based probing support for the core twl6040 driver. Child
devices will be created as MFD devices:
- ASoC codec is always created
- Vibra child is only created if the vibra section present in the DT blob.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 19 insertions, 8 deletions

diff --git a/drivers/mfd/twl6040-core.c b/drivers/mfd/twl6040-core.c
index 9765dc2b0ca3..450a28fe8fc2 100644
--- a/drivers/mfd/twl6040-core.c
+++ b/drivers/mfd/twl6040-core.c
@@ -29,6 +29,10 @@
 #include <linux/kernel.h>
 #include <linux/err.h>
 #include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_gpio.h>
+#include <linux/of_platform.h>
 #include <linux/gpio.h>
 #include <linux/delay.h>
 #include <linux/i2c.h>
@@ -505,11 +509,12 @@ static int __devinit twl6040_probe(struct i2c_client *client,
                                      const struct i2c_device_id *id)
 {
         struct twl6040_platform_data *pdata = client->dev.platform_data;
+        struct device_node *node = client->dev.of_node;
         struct twl6040 *twl6040;
         struct mfd_cell *cell = NULL;
         int irq, ret, children = 0;
 
-        if (!pdata) {
+        if (!pdata && !node) {
                 dev_err(&client->dev, "Platform data is missing\n");
                 return -EINVAL;
         }
@@ -560,9 +565,13 @@ static int __devinit twl6040_probe(struct i2c_client *client,
         twl6040->rev = twl6040_reg_read(twl6040, TWL6040_REG_ASICREV);
 
         /* ERRATA: Automatic power-up is not possible in ES1.0 */
-        if (twl6040_get_revid(twl6040) > TWL6040_REV_ES1_0)
-                twl6040->audpwron = pdata->audpwron_gpio;
-        else
+        if (twl6040_get_revid(twl6040) > TWL6040_REV_ES1_0) {
+                if (pdata)
+                        twl6040->audpwron = pdata->audpwron_gpio;
+                else
+                        twl6040->audpwron = of_get_named_gpio(node,
+                                                "ti,audpwron-gpio", 0);
+        } else
                 twl6040->audpwron = -EINVAL;
 
         if (gpio_is_valid(twl6040->audpwron)) {
@@ -602,13 +611,13 @@ static int __devinit twl6040_probe(struct i2c_client *client,
         twl6040_codec_rsrc[0].end = irq;
         cell->resources = twl6040_codec_rsrc;
         cell->num_resources = ARRAY_SIZE(twl6040_codec_rsrc);
-        if (pdata->codec) {
+        if (pdata && pdata->codec) {
                 cell->platform_data = pdata->codec;
                 cell->pdata_size = sizeof(*pdata->codec);
         }
         children++;
 
-        if (pdata->vibra) {
+        if ((pdata && pdata->vibra) || of_find_node_by_name(node, "vibra")) {
                 irq = twl6040->irq_base + TWL6040_IRQ_VIB;
 
                 cell = &twl6040->cells[children];
@@ -618,8 +627,10 @@ static int __devinit twl6040_probe(struct i2c_client *client,
                 cell->resources = twl6040_vibra_rsrc;
                 cell->num_resources = ARRAY_SIZE(twl6040_vibra_rsrc);
 
-                cell->platform_data = pdata->vibra;
-                cell->pdata_size = sizeof(*pdata->vibra);
+                if (pdata && pdata->vibra) {
+                        cell->platform_data = pdata->vibra;
+                        cell->pdata_size = sizeof(*pdata->vibra);
+                }
                 children++;
         }