[PATCH 1/1] pinctlr: mcp23s08: Fix add_data and irqchip_add_nested call order

[Phil Reid <preid@xxxxxxxxxxxxxxxxx>]

Currently probing of the mcp23s08 results in an error message
"detected irqchip that is shared with multiple gpiochips:
please fix the driver"

This is due to the following:

Call to mcp23s08_irqchip_setup() with call hierarchy:
mcp23s08_irqchip_setup()
  gpiochip_irqchip_add_nested()
    gpiochip_irqchip_add_key()
      gpiochip_set_irq_hooks()

Call to devm_gpiochip_add_data() with call hierarchy:
devm_gpiochip_add_data()
  gpiochip_add_data_with_key()
    gpiochip_add_irqchip()
      gpiochip_set_irq_hooks()

The gpiochip_add_irqchip() returns immediately if there isn't a irqchip
but we added a irqchip due to the previous mcp23s08_irqchip_setup()
call. So it calls gpiochip_set_irq_hooks() a second time.

Fix this by moving the call to devm_gpiochip_add_data before
the call to mcp23s08_irqchip_setup

Suggested-by: Marco Felsch <m.felsch@xxxxxxxxxxxxxx>
Signed-off-by: Phil Reid <preid@xxxxxxxxxxxxxxxxx>
---
 drivers/pinctrl/pinctrl-mcp23s08.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-mcp23s08.c b/drivers/pinctrl/pinctrl-mcp23s08.c
index 5d7a851..c53be73 100644
--- a/drivers/pinctrl/pinctrl-mcp23s08.c
+++ b/drivers/pinctrl/pinctrl-mcp23s08.c
@@ -382,7 +382,6 @@ struct mcp23s08_driver_data {
 	struct mcp23s08		chip[];
 };
 
-
 static int mcp23s08_direction_input(struct gpio_chip *chip, unsigned offset)
 {
 	struct mcp23s08	*mcp = gpiochip_get_data(chip);
@@ -881,6 +880,10 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
 	if (ret < 0)
 		goto fail;
 
+	ret = devm_gpiochip_add_data(dev, &mcp->chip, mcp);
+	if (ret < 0)
+		goto fail;
+
 	mcp->irq_controller =
 		device_property_read_bool(dev, "interrupt-controller");
 	if (mcp->irq && mcp->irq_controller) {
@@ -922,10 +925,6 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
 			goto fail;
 	}
 
-	ret = devm_gpiochip_add_data(dev, &mcp->chip, mcp);
-	if (ret < 0)
-		goto fail;
-
 	if (one_regmap_config) {
 		mcp->pinctrl_desc.name = devm_kasprintf(dev, GFP_KERNEL,
 				"mcp23xxx-pinctrl.%d", raw_chip_address);
@@ -1018,7 +1017,6 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
 #endif
 #endif /* CONFIG_OF */
 
-
 #if IS_ENABLED(CONFIG_I2C)
 
 static int mcp230xx_probe(struct i2c_client *client,
-- 
1.8.3.1