pinctrl: mcp23s08: Allocate irq_chip dynamic

Keeping the irq_chip definition static shares it with multiple instances
of the mcp23s08 gpiochip in the system. This is bad and now we get this
warning from gpiolib core:

"detected irqchip that is shared with multiple gpiochips: please fix the
driver."

Hence, move the irq_chip definition from being driver static into the
struct mcp23s08. So a unique irq_chip is used for each gpiochip
instance.
Signed-off-by: Lars Poeschel <poeschel@lemonage.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-mcp23s08.c

@@ -68,6 +68,7 @@ struct mcp23s08 {
 	struct mutex		lock;
 
 	struct gpio_chip	chip;
+	struct irq_chip		irq_chip;
 
 	struct regmap		*regmap;
 	struct device		*dev;
@@ -607,15 +608,6 @@ static void mcp23s08_irq_bus_unlock(struct irq_data *data)
 	mutex_unlock(&mcp->lock);
 }
 
-static struct irq_chip mcp23s08_irq_chip = {
-	.name = "gpio-mcp23xxx",
-	.irq_mask = mcp23s08_irq_mask,
-	.irq_unmask = mcp23s08_irq_unmask,
-	.irq_set_type = mcp23s08_irq_set_type,
-	.irq_bus_lock = mcp23s08_irq_bus_lock,
-	.irq_bus_sync_unlock = mcp23s08_irq_bus_unlock,
-};
-
 static int mcp23s08_irq_setup(struct mcp23s08 *mcp)
 {
 	struct gpio_chip *chip = &mcp->chip;
@@ -645,7 +637,7 @@ static int mcp23s08_irqchip_setup(struct mcp23s08 *mcp)
 	int err;
 
 	err =  gpiochip_irqchip_add_nested(chip,
-					   &mcp23s08_irq_chip,
+					   &mcp->irq_chip,
 					   0,
 					   handle_simple_irq,
 					   IRQ_TYPE_NONE);
@@ -656,7 +648,7 @@ static int mcp23s08_irqchip_setup(struct mcp23s08 *mcp)
 	}
 
 	gpiochip_set_nested_irqchip(chip,
-				    &mcp23s08_irq_chip,
+				    &mcp->irq_chip,
 				    mcp->irq);
 
 	return 0;
@@ -1042,6 +1034,13 @@ static int mcp230xx_probe(struct i2c_client *client,
 		return -ENOMEM;
 
 	mcp->irq = client->irq;
+	mcp->irq_chip.name = dev_name(&client->dev);
+	mcp->irq_chip.irq_mask = mcp23s08_irq_mask;
+	mcp->irq_chip.irq_unmask = mcp23s08_irq_unmask;
+	mcp->irq_chip.irq_set_type = mcp23s08_irq_set_type;
+	mcp->irq_chip.irq_bus_lock = mcp23s08_irq_bus_lock;
+	mcp->irq_chip.irq_bus_sync_unlock = mcp23s08_irq_bus_unlock;
+
 	status = mcp23s08_probe_one(mcp, &client->dev, client, client->addr,
 				    id->driver_data, pdata->base, 0);
 	if (status)
@@ -1151,6 +1150,13 @@ static int mcp23s08_probe(struct spi_device *spi)
 		chips--;
 		data->mcp[addr] = &data->chip[chips];
 		data->mcp[addr]->irq = spi->irq;
+		data->mcp[addr]->irq_chip.name = dev_name(&spi->dev);
+		data->mcp[addr]->irq_chip.irq_mask = mcp23s08_irq_mask;
+		data->mcp[addr]->irq_chip.irq_unmask = mcp23s08_irq_unmask;
+		data->mcp[addr]->irq_chip.irq_set_type = mcp23s08_irq_set_type;
+		data->mcp[addr]->irq_chip.irq_bus_lock = mcp23s08_irq_bus_lock;
+		data->mcp[addr]->irq_chip.irq_bus_sync_unlock =
+			mcp23s08_irq_bus_unlock;
 		status = mcp23s08_probe_one(data->mcp[addr], &spi->dev, spi,
 					    0x40 | (addr << 1), type,
 					    pdata->base, addr);