[PATCH v2] Adds support for Open Firmware in MAX730x GPIO Driver

[Christophe Leroy <christophe.leroy@c-s.fr>]

This patch allows the use of the MAX730x Driver on systems using
the Open Firmware platform format.
The bit_per_word can be set in the OF Device tree, so no need to force it as with
the platform_data.

Signed-off-by: Patrick Vasseur <patrick.vasseur@c-s.fr>
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>

diff -ur linux-3.7.9/drivers/gpio/gpio-max7301.c linux/drivers/gpio/gpio-max7301.c
--- linux-3.7.9/drivers/gpio/gpio-max7301.c	2013-02-17 19:53:32.000000000 +0100
+++ linux/drivers/gpio/gpio-max7301.c	2013-02-17 12:57:40.000000000 +0100
@@ -56,7 +56,8 @@
 	int ret;
 
 	/* bits_per_word cannot be configured in platform data */
-	spi->bits_per_word = 16;
+	if (spi->dev.platform_data)
+		spi->bits_per_word = 16;
 	ret = spi_setup(spi);
 	if (ret < 0)
 		return ret;
diff -ur linux-3.7.9/drivers/gpio/gpio-max730x.c linux/drivers/gpio/gpio-max730x.c
--- linux-3.7.9/drivers/gpio/gpio-max730x.c	2013-02-17 19:53:32.000000000 +0100
+++ linux/drivers/gpio/gpio-max730x.c	2013-02-22 10:15:46.000000000 +0100
@@ -163,12 +163,13 @@
 int __devinit __max730x_probe(struct max7301 *ts)
 {
 	struct device *dev = ts->dev;
+	struct device_node *np = dev->of_node;
 	struct max7301_platform_data *pdata;
 	int i, ret;
 
 	pdata = dev->platform_data;
-	if (!pdata || !pdata->base) {
-		dev_err(dev, "incorrect or missing platform data\n");
+	if ((!pdata || !pdata->base) && !np) {
+		dev_err(dev, "No platform data nor Device Tree found\n");
 		return -EINVAL;
 	}
 
@@ -178,7 +179,6 @@
 	/* Power up the chip and disable IRQ output */
 	ts->write(dev, 0x04, 0x01);
 
-	ts->input_pullup_active = pdata->input_pullup_active;
 	ts->chip.label = dev->driver->name;
 
 	ts->chip.direction_input = max7301_direction_input;
@@ -186,7 +186,12 @@
 	ts->chip.direction_output = max7301_direction_output;
 	ts->chip.set = max7301_set;
 
-	ts->chip.base = pdata->base;
+	if (pdata) {
+		ts->input_pullup_active = pdata->input_pullup_active;
+		ts->chip.base = pdata->base;
+	} else {
+		ts->chip.base = -1;
+	}
 	ts->chip.ngpio = PIN_NUMBER;
 	ts->chip.can_sleep = 1;
 	ts->chip.dev = dev;