[PATCH 2/2] mfd: qcom-pm8008: support PMICs with no interrupt line

[Oleg Keri <okerixx@gmail.com>]

The interrupt is only needed for the temperature alarm and the two GPIOs.
Where the pin is not routed the regulators are still perfectly usable, but
probe fails: client->irq is 0 and request_threaded_irq() rejects it.

Skip the IRQ chip in that case and register the regulator cell alone. The
temperature alarm cannot be registered without a domain either, because
its IORESOURCE_IRQ would be handed to the platform device as a raw number
rather than being mapped, and the GPIO cell needs the domain for the same
reason.

Signed-off-by: Oleg Keri <okerixx@gmail.com>
---
 drivers/mfd/qcom-pm8008.c | 63 +++++++++++++++++++++++++--------------
 1 file changed, 40 insertions(+), 23 deletions(-)

diff --git a/drivers/mfd/qcom-pm8008.c b/drivers/mfd/qcom-pm8008.c
index 60204cc9a2dc..b51a9657ee56 100644
--- a/drivers/mfd/qcom-pm8008.c
+++ b/drivers/mfd/qcom-pm8008.c
@@ -183,6 +183,10 @@ static const struct mfd_cell pm8008_cells[] = {
 	MFD_CELL_NAME("pm8008-gpio"),
 };
 
+static const struct mfd_cell pm8008_regulator_cells[] = {
+	MFD_CELL_NAME("pm8008-regulator"),
+};
+
 static void devm_irq_domain_fwnode_release(void *data)
 {
 	struct fwnode_handle *fwnode = data;
@@ -195,9 +199,12 @@ static int pm8008_probe(struct i2c_client *client)
 	struct regmap_irq_chip_data *irq_data;
 	struct device *dev = &client->dev;
 	struct regmap *regmap, *regmap2;
+	const struct mfd_cell *cells;
 	struct fwnode_handle *fwnode;
+	struct irq_domain *domain;
 	struct i2c_client *dummy;
 	struct gpio_desc *reset;
+	int num_cells;
 	char *name;
 	int ret;
 
@@ -231,33 +238,43 @@ static int pm8008_probe(struct i2c_client *client)
 	 */
 	usleep_range(1000, 2000);
 
-	name = devm_kasprintf(dev, GFP_KERNEL, "%pOF-internal", dev->of_node);
-	if (!name)
-		return -ENOMEM;
-
-	name = strreplace(name, '/', ':');
-
-	fwnode = irq_domain_alloc_named_fwnode(name);
-	if (!fwnode)
-		return -ENOMEM;
-
-	ret = devm_add_action_or_reset(dev, devm_irq_domain_fwnode_release, fwnode);
-	if (ret)
-		return ret;
-
-	ret = devm_regmap_add_irq_chip_fwnode(dev, fwnode, regmap, client->irq,
-				IRQF_SHARED, 0, &pm8008_irq_chip, &irq_data);
-	if (ret) {
-		dev_err(dev, "failed to add IRQ chip: %d\n", ret);
-		return ret;
+	if (client->irq > 0) {
+		name = devm_kasprintf(dev, GFP_KERNEL, "%pOF-internal", dev->of_node);
+		if (!name)
+			return -ENOMEM;
+
+		name = strreplace(name, '/', ':');
+
+		fwnode = irq_domain_alloc_named_fwnode(name);
+		if (!fwnode)
+			return -ENOMEM;
+
+		ret = devm_add_action_or_reset(dev, devm_irq_domain_fwnode_release, fwnode);
+		if (ret)
+			return ret;
+
+		ret = devm_regmap_add_irq_chip_fwnode(dev, fwnode, regmap,
+						      client->irq, IRQF_SHARED, 0,
+						      &pm8008_irq_chip, &irq_data);
+		if (ret) {
+			dev_err(dev, "failed to add IRQ chip: %d\n", ret);
+			return ret;
+		}
+
+		domain = regmap_irq_get_domain(irq_data);
+		cells = pm8008_cells;
+		num_cells = ARRAY_SIZE(pm8008_cells);
+	} else {
+		domain = NULL;
+		cells = pm8008_regulator_cells;
+		num_cells = ARRAY_SIZE(pm8008_regulator_cells);
 	}
 
 	/* Needed by GPIO driver. */
-	dev_set_drvdata(dev, regmap_irq_get_domain(irq_data));
+	dev_set_drvdata(dev, domain);
 
-	return devm_mfd_add_devices(dev, PLATFORM_DEVID_AUTO, pm8008_cells,
-				ARRAY_SIZE(pm8008_cells), NULL, 0,
-				regmap_irq_get_domain(irq_data));
+	return devm_mfd_add_devices(dev, PLATFORM_DEVID_AUTO, cells,
+				num_cells, NULL, 0, domain);
 }
 
 static const struct of_device_id pm8008_match[] = {
-- 
2.55.0