[PATCH v2 2/3] MFD: twl6040: Allocate IRQ numbers dynamically

[Peter Ujfalusi <peter.ujfalusi@ti.com>]

Use irq_alloc_descs() to get the IRQ number range dynamically instead of
the hardwired use if pdata->irq_base.
The twl6040 only provides interrupts for it's internal components which
means that it is not working as an IRQ expander type of device.
The client drivers will receive their interrupt numbers via pdata which
is configured based on the received IRQ range we got from irq_alloc_descs()

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
---
 drivers/mfd/twl6040-core.c |    3 +--
 drivers/mfd/twl6040-irq.c  |   13 +++++++++++--
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/mfd/twl6040-core.c b/drivers/mfd/twl6040-core.c
index 7a92d95..c50fba7 100644
--- a/drivers/mfd/twl6040-core.c
+++ b/drivers/mfd/twl6040-core.c
@@ -515,7 +515,7 @@ static int __devinit twl6040_probe(struct i2c_client *client,
 	}
 
 	/* In order to operate correctly we need valid interrupt config */
-	if (!client->irq || !pdata->irq_base) {
+	if (!client->irq) {
 		dev_err(&client->dev, "Invalid IRQ configuration\n");
 		return -EINVAL;
 	}
@@ -552,7 +552,6 @@ static int __devinit twl6040_probe(struct i2c_client *client,
 
 	twl6040->dev = &client->dev;
 	twl6040->irq = client->irq;
-	twl6040->irq_base = pdata->irq_base;
 
 	mutex_init(&twl6040->mutex);
 	mutex_init(&twl6040->io_mutex);
diff --git a/drivers/mfd/twl6040-irq.c b/drivers/mfd/twl6040-irq.c
index 008022c..914978e 100644
--- a/drivers/mfd/twl6040-irq.c
+++ b/drivers/mfd/twl6040-irq.c
@@ -23,6 +23,7 @@
 
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/err.h>
 #include <linux/irq.h>
 #include <linux/interrupt.h>
 #include <linux/mfd/core.h>
@@ -138,7 +139,7 @@ static irqreturn_t twl6040_irq_thread(int irq, void *data)
 
 int twl6040_irq_init(struct twl6040 *twl6040)
 {
-	int i, nr_irqs, ret;
+	int i, nr_irqs, irq_base, ret;
 	u8 val;
 
 	mutex_init(&twl6040->irq_mutex);
@@ -149,8 +150,16 @@ int twl6040_irq_init(struct twl6040 *twl6040)
 	twl6040_reg_write(twl6040, TWL6040_REG_INTMR, TWL6040_ALLINT_MSK);
 
 	nr_irqs = ARRAY_SIZE(twl6040_irqs);
+
+	irq_base = irq_alloc_descs(-1, 0, nr_irqs, 0);
+	if (IS_ERR_VALUE(irq_base)) {
+		dev_err(twl6040->dev, "Fail to allocate IRQ descs\n");
+		return irq_base;
+	}
+	twl6040->irq_base = irq_base;
+
 	/* Register them with genirq */
-	for (i = twl6040->irq_base; i < twl6040->irq_base + nr_irqs; i++) {
+	for (i = irq_base; i < irq_base + nr_irqs; i++) {
 		irq_set_chip_data(i, twl6040);
 		irq_set_chip_and_handler(i, &twl6040_irq_chip,
 					 handle_level_irq);
-- 
1.7.8.6