[PATCH v3 09/21] mfd: axp20x: Allow AXP chips without interrupt lines

[Andre Przywara <andre.przywara@arm.com>]

Currently the AXP chip requires to have its IRQ line connected to some
interrupt controller, and will fail probing when this is not the case.

On a new Allwinner SoC (H616) there is no NMI pin anymore, so the
interrupt functionality of the AXP chip is simply not available.

Check whether the DT describes the AXP chip as an interrupt controller
before trying to register the irqchip, to avoid probe failures on
setups without an interrupt.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
---
 drivers/mfd/axp20x.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/mfd/axp20x.c b/drivers/mfd/axp20x.c
index aa59496e4376..a52595c49d40 100644
--- a/drivers/mfd/axp20x.c
+++ b/drivers/mfd/axp20x.c
@@ -959,12 +959,17 @@ int axp20x_device_probe(struct axp20x_dev *axp20x)
 				     AXP806_REG_ADDR_EXT_ADDR_SLAVE_MODE);
 	}
 
-	ret = regmap_add_irq_chip(axp20x->regmap, axp20x->irq,
-			  IRQF_ONESHOT | IRQF_SHARED | axp20x->irq_flags,
-			   -1, axp20x->regmap_irq_chip, &axp20x->regmap_irqc);
-	if (ret) {
-		dev_err(axp20x->dev, "failed to add irq chip: %d\n", ret);
-		return ret;
+	if (!axp20x->dev->of_node ||
+	    of_property_read_bool(axp20x->dev->of_node, "interrupt-controller")) {
+		ret = regmap_add_irq_chip(axp20x->regmap, axp20x->irq,
+				IRQF_ONESHOT | IRQF_SHARED | axp20x->irq_flags,
+				-1, axp20x->regmap_irq_chip,
+				&axp20x->regmap_irqc);
+		if (ret) {
+			dev_err(axp20x->dev, "failed to add irq chip: %d\n",
+				ret);
+			return ret;
+		}
 	}
 
 	ret = mfd_add_devices(axp20x->dev, -1, axp20x->cells,
-- 
2.17.5