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>

2 files changed, 25 insertions, 8 deletions

diff --git a/drivers/mfd/twl6040-core.c b/drivers/mfd/twl6040-core.c
index 9765dc2..450a28f 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++;
 	}
 
diff --git a/drivers/mfd/twl6040-irq.c b/drivers/mfd/twl6040-irq.c
index 914978e..4b42543 100644
--- a/drivers/mfd/twl6040-irq.c
+++ b/drivers/mfd/twl6040-irq.c
@@ -25,6 +25,8 @@
 #include <linux/module.h>
 #include <linux/err.h>
 #include <linux/irq.h>
+#include <linux/of.h>
+#include <linux/irqdomain.h>
 #include <linux/interrupt.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/twl6040.h>
@@ -139,6 +141,7 @@ static irqreturn_t twl6040_irq_thread(int irq, void *data)
 
 int twl6040_irq_init(struct twl6040 *twl6040)
 {
+	struct device_node *node = twl6040->dev->of_node;
 	int i, nr_irqs, irq_base, ret;
 	u8 val;
 
@@ -158,6 +161,9 @@ int twl6040_irq_init(struct twl6040 *twl6040)
 	}
 	twl6040->irq_base = irq_base;
 
+	irq_domain_add_legacy(node, ARRAY_SIZE(twl6040_irqs), irq_base, 0,
+			      &irq_domain_simple_ops, NULL);
+
 	/* Register them with genirq */
 	for (i = irq_base; i < irq_base + nr_irqs; i++) {
 		irq_set_chip_data(i, twl6040);