[PATCH V2 1/2] mfd: da9062: Remove IRQ requirement

[Christoph Niedermaier]

This patch removes the requirement for an IRQ, because for the core
functionality IRQ isn't needed. So this makes the DA9061/62 chip
useable for designs which haven't connected the IRQ pin.

Signed-off-by: Christoph Niedermaier <cniedermaier at dh-electronics.com>
---
Cc: Support Opensource <support.opensource at diasemi.com>
Cc: Lee Jones <lee at kernel.org>
Cc: Adam Thomson <Adam.Thomson.Opensource at diasemi.com>
Cc: Liam Girdwood <lgirdwood at gmail.com>
Cc: Mark Brown <broonie at kernel.org>
Cc: Marek Vasut <marex at denx.de>
Cc: kernel at dh-electronics.com
Cc: linux-kernel at vger.kernel.org
To: linux-arm-kernel at lists.infradead.org
---
V2: - Rebase on current next 20230209
    - Add Lee Jones to Cc list
---
 drivers/mfd/da9062-core.c | 98 +++++++++++++++++++++++++++++++++++------------
 1 file changed, 73 insertions(+), 25 deletions(-)

diff --git a/drivers/mfd/da9062-core.c b/drivers/mfd/da9062-core.c
index 40cde51e5719..caa597400dd1 100644
--- a/drivers/mfd/da9062-core.c
+++ b/drivers/mfd/da9062-core.c
@@ -212,6 +212,27 @@ static const struct mfd_cell da9061_devs[] = {
 	},
 };
 
+static const struct mfd_cell da9061_devs_without_irq[] = {
+	{
+		.name		= "da9061-core",
+	},
+	{
+		.name		= "da9062-regulators",
+	},
+	{
+		.name		= "da9061-watchdog",
+		.of_compatible  = "dlg,da9061-watchdog",
+	},
+	{
+		.name		= "da9061-thermal",
+		.of_compatible  = "dlg,da9061-thermal",
+	},
+	{
+		.name		= "da9061-onkey",
+		.of_compatible = "dlg,da9061-onkey",
+	},
+};
+
 static const struct resource da9062_core_resources[] = {
 	DEFINE_RES_NAMED(DA9062_IRQ_VDD_WARN, 1, "VDD_WARN", IORESOURCE_IRQ),
 };
@@ -288,6 +309,35 @@ static const struct mfd_cell da9062_devs[] = {
 	},
 };
 
+static const struct mfd_cell da9062_devs_without_irq[] = {
+	{
+		.name		= "da9062-core",
+	},
+	{
+		.name		= "da9062-regulators",
+	},
+	{
+		.name		= "da9062-watchdog",
+		.of_compatible  = "dlg,da9062-watchdog",
+	},
+	{
+		.name		= "da9062-thermal",
+		.of_compatible  = "dlg,da9062-thermal",
+	},
+	{
+		.name		= "da9062-rtc",
+		.of_compatible  = "dlg,da9062-rtc",
+	},
+	{
+		.name		= "da9062-onkey",
+		.of_compatible	= "dlg,da9062-onkey",
+	},
+	{
+		.name		= "da9062-gpio",
+		.of_compatible	= "dlg,da9062-gpio",
+	},
+};
+
 static int da9062_clear_fault_log(struct da9062 *chip)
 {
 	int ret;
@@ -625,7 +675,7 @@ static int da9062_i2c_probe(struct i2c_client *i2c)
 {
 	const struct i2c_device_id *id = i2c_client_get_device_id(i2c);
 	struct da9062 *chip;
-	unsigned int irq_base;
+	unsigned int irq_base = 0;
 	const struct mfd_cell *cell;
 	const struct regmap_irq_chip *irq_chip;
 	const struct regmap_config *config;
@@ -645,21 +695,16 @@ static int da9062_i2c_probe(struct i2c_client *i2c)
 	i2c_set_clientdata(i2c, chip);
 	chip->dev = &i2c->dev;
 
-	if (!i2c->irq) {
-		dev_err(chip->dev, "No IRQ configured\n");
-		return -EINVAL;
-	}
-
 	switch (chip->chip_type) {
 	case COMPAT_TYPE_DA9061:
-		cell = da9061_devs;
-		cell_num = ARRAY_SIZE(da9061_devs);
+		cell = i2c->irq ? da9061_devs : da9061_devs_without_irq;
+		cell_num = i2c->irq ? ARRAY_SIZE(da9061_devs) : ARRAY_SIZE(da9061_devs_without_irq);
 		irq_chip = &da9061_irq_chip;
 		config = &da9061_regmap_config;
 		break;
 	case COMPAT_TYPE_DA9062:
-		cell = da9062_devs;
-		cell_num = ARRAY_SIZE(da9062_devs);
+		cell = i2c->irq ? da9062_devs : da9062_devs_without_irq;
+		cell_num = i2c->irq ? ARRAY_SIZE(da9062_devs) : ARRAY_SIZE(da9062_devs_without_irq);
 		irq_chip = &da9062_irq_chip;
 		config = &da9062_regmap_config;
 		break;
@@ -695,29 +740,32 @@ static int da9062_i2c_probe(struct i2c_client *i2c)
 	if (ret)
 		return ret;
 
-	ret = da9062_configure_irq_type(chip, i2c->irq, &trigger_type);
-	if (ret < 0) {
-		dev_err(chip->dev, "Failed to configure IRQ type\n");
-		return ret;
-	}
+	if (i2c->irq) {
+		ret = da9062_configure_irq_type(chip, i2c->irq, &trigger_type);
+		if (ret < 0) {
+			dev_err(chip->dev, "Failed to configure IRQ type\n");
+			return ret;
+		}
 
-	ret = regmap_add_irq_chip(chip->regmap, i2c->irq,
-			trigger_type | IRQF_SHARED | IRQF_ONESHOT,
-			-1, irq_chip, &chip->regmap_irq);
-	if (ret) {
-		dev_err(chip->dev, "Failed to request IRQ %d: %d\n",
-			i2c->irq, ret);
-		return ret;
-	}
+		ret = regmap_add_irq_chip(chip->regmap, i2c->irq,
+				trigger_type | IRQF_SHARED | IRQF_ONESHOT,
+				-1, irq_chip, &chip->regmap_irq);
+		if (ret) {
+			dev_err(chip->dev, "Failed to request IRQ %d: %d\n",
+				i2c->irq, ret);
+			return ret;
+		}
 
-	irq_base = regmap_irq_chip_get_base(chip->regmap_irq);
+		irq_base = regmap_irq_chip_get_base(chip->regmap_irq);
+	}
 
 	ret = mfd_add_devices(chip->dev, PLATFORM_DEVID_NONE, cell,
 			      cell_num, NULL, irq_base,
 			      NULL);
 	if (ret) {
 		dev_err(chip->dev, "Cannot register child devices\n");
-		regmap_del_irq_chip(i2c->irq, chip->regmap_irq);
+		if (i2c->irq)
+			regmap_del_irq_chip(i2c->irq, chip->regmap_irq);
 		return ret;
 	}
 
-- 
2.11.0