[PATCH v2] mfd: da9052-core: Use regmap_irq_get_virq() and fix the probe

[Fabio Estevam <festevam@gmail.com>]

From: Fabio Estevam <fabio.estevam@freescale.com>

On a mx53qsb dt-kernel the da9052-core driver fails to probe as follows:

da9052 1-0048: DA9052 ADC IRQ failed ret=-22

The reason for the error was due to passing only the offset as the interrupt 
number in request_threaded_irq().

The recommended approach though is to use regmap_get_virq() to acquire the 
interrupt number.

Fix it and allow the driver to probe successfully.

Also provide a few more error logs and change the irq string to "adc-irq", so
that it appears as a single word in 'cat /proc/interrupts'.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
---
Changes since v2:
- Use regmap_irq_get_virq() instead of relying on irq_base

Arnd/Mark,

I also plan to convert the other da9052 drivers to use regmap_irq_get_virq().

 drivers/mfd/da9052-core.c         |   31 ++++++++++++++++++-------------
 include/linux/mfd/da9052/da9052.h |    1 +
 2 files changed, 19 insertions(+), 13 deletions(-)

diff --git a/drivers/mfd/da9052-core.c b/drivers/mfd/da9052-core.c
index a0a62b2..79f9674 100644
--- a/drivers/mfd/da9052-core.c
+++ b/drivers/mfd/da9052-core.c
@@ -782,35 +782,40 @@ int __devinit da9052_device_init(struct da9052 *da9052, u8 chip_id)
 
 	da9052->chip_id = chip_id;
 
-	if (!pdata || !pdata->irq_base)
-		da9052->irq_base = -1;
-	else
-		da9052->irq_base = pdata->irq_base;
-
 	ret = regmap_add_irq_chip(da9052->regmap, da9052->chip_irq,
 				  IRQF_TRIGGER_LOW | IRQF_ONESHOT,
-				  da9052->irq_base, &da9052_regmap_irq_chip,
+				  -1, &da9052_regmap_irq_chip,
 				  &da9052->irq_data);
-	if (ret < 0)
+	if (ret < 0) {
+		dev_err(da9052->dev, "regmap_add_irq_chip failed: %d\n", ret);
 		goto regmap_err;
+	}
 
-	da9052->irq_base = regmap_irq_chip_get_base(da9052->irq_data);
+	da9052->irq = regmap_irq_get_virq(da9052->irq_data, DA9052_IRQ_ADC_EOM);
 
-	ret = request_threaded_irq(DA9052_IRQ_ADC_EOM, NULL, da9052_auxadc_irq,
+	if (da9052->irq < 0) {
+		ret = da9052->irq;
+		dev_err(da9052->dev, "regmap_irq_get_virq failed: %d\n", ret);
+		goto regmap_err;
+	}
+
+	ret = request_threaded_irq(da9052->irq, NULL, da9052_auxadc_irq,
 				   IRQF_TRIGGER_LOW | IRQF_ONESHOT,
-				   "adc irq", da9052);
+				   "adc-irq", da9052);
 	if (ret != 0)
 		dev_err(da9052->dev, "DA9052 ADC IRQ failed ret=%d\n", ret);
 
 	ret = mfd_add_devices(da9052->dev, -1, da9052_subdev_info,
 			      ARRAY_SIZE(da9052_subdev_info), NULL, 0, NULL);
-	if (ret)
+	if (ret) {
+		dev_err(da9052->dev, "mfd_add_devices failed: %d\n", ret);
 		goto err;
+	}
 
 	return 0;
 
 err:
-	free_irq(DA9052_IRQ_ADC_EOM, da9052);
+	free_irq(da9052->irq, da9052);
 	mfd_remove_devices(da9052->dev);
 regmap_err:
 	return ret;
@@ -818,7 +823,7 @@ regmap_err:
 
 void da9052_device_exit(struct da9052 *da9052)
 {
-	free_irq(DA9052_IRQ_ADC_EOM, da9052);
+	free_irq(da9052->irq, da9052);
 	regmap_del_irq_chip(da9052->chip_irq, da9052->irq_data);
 	mfd_remove_devices(da9052->dev);
 }
diff --git a/include/linux/mfd/da9052/da9052.h b/include/linux/mfd/da9052/da9052.h
index 0507c4c..f0b259d 100644
--- a/include/linux/mfd/da9052/da9052.h
+++ b/include/linux/mfd/da9052/da9052.h
@@ -99,6 +99,7 @@ struct da9052 {
 	u8 chip_id;
 
 	int chip_irq;
+	int irq;
 };
 
 /* ADC API */
-- 
1.7.9.5