[linux-joule][PATCH 8/9] mfd: arizona: Request interrupt gpio for arizona to fix pinmux issues

[Wen-chien Jesse Sung]

From: Jukka Laitinen <jukka.laitinen at intel.com>

BugLink: https://launchpad.net/bugs/1698051

This complements the commit 3092f8050ec.

In case the arizona IRQ is defined in the ACPI, request the GPIO to
make sure that the GPIO is muxed as input.

Signed-off-by: Jukka Laitinen <jukka.laitinen at intel.com>
Signed-off-by: Wen-chien Jesse Sung <jesse.sung at canonical.com>
---
 drivers/mfd/arizona-irq.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/mfd/arizona-irq.c b/drivers/mfd/arizona-irq.c
index 3d425e9..0f2f515 100644
--- a/drivers/mfd/arizona-irq.c
+++ b/drivers/mfd/arizona-irq.c
@@ -24,6 +24,8 @@
 #include <linux/mfd/arizona/core.h>
 #include <linux/mfd/arizona/registers.h>
 
+#include <linux/acpi.h>
+#include "../gpio/gpiolib.h"
 #include "arizona.h"
 
 static int arizona_map_irq(struct arizona *arizona, int irq)
@@ -190,6 +192,7 @@ int arizona_irq_init(struct arizona *arizona)
 	int ret, i;
 	const struct regmap_irq_chip *aod, *irq;
 	struct irq_data *irq_data;
+	struct gpio_desc *acpi_gpio;
 
 	arizona->ctrlif_error = true;
 
@@ -334,6 +337,15 @@ int arizona_irq_init(struct arizona *arizona)
 	}
 
 	/* Used to emulate edge trigger and to work around broken pinmux */
+
+	/* If the irq is not defined by pdata, but is defined in ACPI, set the gpio number
+	   into the pdata to fix the pinmux */
+	if (arizona->pdata.irq_gpio <= 0) {
+		acpi_gpio=acpi_get_gpiod_by_index(ACPI_COMPANION(arizona->dev),NULL,0,NULL);
+		if (!IS_ERR(acpi_gpio))
+			arizona->pdata.irq_gpio=desc_to_gpio(acpi_gpio);
+	}
+
 	if (arizona->pdata.irq_gpio) {
 		if (gpio_to_irq(arizona->pdata.irq_gpio) != arizona->irq) {
 			dev_warn(arizona->dev, "IRQ %d is not GPIO %d (%d)\n",
-- 
2.7.4