[PATCH v8 5/5] regulator: renesas-usb-vbus-regulator: Add RZ/G3L VBUS regulator support

From: Biju Das <[email protected]>

Add dual USB VBUS regulator support for the RZ/G3L (r9a08g046) SoC, which
has two OTG controllers (one per port), unlike RZ/G3S which has only one.

Introduce a RZG3L_USB_VBUS_REG macro and a rzg3l_usb_vbus_regulators
array with two descriptors: vbus0 (BIT(0)) and vbus1 (BIT(1)), both
sourced from a regulators sub-node as defined in the binding. Add a
dedicated rzg3l_usb_vbus_regulator_probe() that iterates over the array
and registers both regulators using devm_regulator_register().

Convert the existing platform driver to use an id_table, allowing it to
dispatch to either the RZ/G2L or RZ/G3L probe function based on the
matched platform device name.

Acked-by: Mark Brown <[email protected]>
Signed-off-by: Biju Das <[email protected]>
---
v7->v8:
 * No change.
v6->v7:
 * No change.
v5->v6:
 * Replaced dev_err->dev_err_probe() in error path of
   rzg3l_usb_vbus_regulator_probe().
 * Retained the tag as the change is trivial.
v4->v5:
 * Collected the tag.
v3->v4:
 * Dropped rzg3l specific platform driver.
 * Dropped the tag as there are new changes.
 * Added id_table handling by introducing a common probe().
v2->v3:
 * No change.
v1->v2:
 * Passing pointer to an array of regulators to make it scalable.
 * Updated commit description.
---
 .../regulator/renesas-usb-vbus-regulator.c    | 73 ++++++++++++++++++-
 1 file changed, 72 insertions(+), 1 deletion(-)

diff --git a/drivers/regulator/renesas-usb-vbus-regulator.c b/drivers/regulator/renesas-usb-vbus-regulator.c
index 22fcf0d10c85..050820a30efb 100644
--- a/drivers/regulator/renesas-usb-vbus-regulator.c
+++ b/drivers/regulator/renesas-usb-vbus-regulator.c
@@ -55,8 +55,79 @@ static int rzg2l_usb_vbus_regulator_probe(struct platform_device *pdev)
 	return 0;
 }
 
+#define RZG3L_USB_VBUS_REG(rname, en_mask)				\
+	{								\
+		.name			= #rname,			\
+		.of_match		= of_match_ptr(#rname),		\
+		.regulators_node	= of_match_ptr("regulators"),	\
+		.type			= REGULATOR_VOLTAGE,		\
+		.owner			= THIS_MODULE,			\
+		.ops			= &rzg2l_usb_vbus_reg_ops,	\
+		.enable_reg		= 0,				\
+		.enable_mask		= (en_mask),			\
+		.enable_is_inverted	= true,				\
+		.fixed_uV		= 5000000,			\
+		.n_voltages		= 1,				\
+	}
+
+static const struct regulator_desc rzg3l_usb_vbus_regulators[] = {
+	RZG3L_USB_VBUS_REG(vbus0, BIT(0)),
+	RZG3L_USB_VBUS_REG(vbus1, BIT(1)),
+};
+
+static int rzg3l_usb_vbus_regulator_probe(struct platform_device *pdev)
+{
+	struct regulator_config config = { };
+	struct device *dev = &pdev->dev;
+	struct regulator_dev *rdev;
+
+	config.dev = pdev->dev.parent;
+	config.regmap = dev_get_regmap(dev->parent, NULL);
+	if (!config.regmap)
+		return dev_err_probe(dev, -ENOENT, "Failed to get regmap\n");
+
+	for (unsigned int i = 0; i < ARRAY_SIZE(rzg3l_usb_vbus_regulators); i++) {
+		rdev = devm_regulator_register(dev, &rzg3l_usb_vbus_regulators[i],
+					       &config);
+		if (IS_ERR(rdev))
+			return dev_err_probe(dev, PTR_ERR(rdev),
+					     "failed to register %s regulator\n",
+					     rzg3l_usb_vbus_regulators[i].name);
+	}
+
+	return 0;
+}
+
+static int rzg2l_usb_vbus_regulator_common_probe(struct platform_device *pdev)
+{
+	int (*probe_func)(struct platform_device *pdev);
+	const struct platform_device_id *id;
+
+	id = platform_get_device_id(pdev);
+	if (!id)
+		return dev_err_probe(&pdev->dev, -ENODEV, "No ID match found\n");
+
+	probe_func = (int (*)(struct platform_device *))id->driver_data;
+
+	return probe_func(pdev);
+}
+
+static const struct platform_device_id rzg2l_usb_vbus_regulator_ids[] = {
+	{
+		.name = "rzg2l-vbus-regulator",
+		.driver_data = (kernel_ulong_t)rzg2l_usb_vbus_regulator_probe
+	},
+	{
+		.name = "rzg3l-vbus-regulator",
+		.driver_data = (kernel_ulong_t)rzg3l_usb_vbus_regulator_probe
+	},
+	{ /* Sentinel */ }
+};
+MODULE_DEVICE_TABLE(platform, rzg2l_usb_vbus_regulator_ids);
+
 static struct platform_driver rzg2l_usb_vbus_regulator_driver = {
-	.probe = rzg2l_usb_vbus_regulator_probe,
+	.probe = rzg2l_usb_vbus_regulator_common_probe,
+	.id_table = rzg2l_usb_vbus_regulator_ids,
 	.driver	= {
 		.name = "rzg2l-vbus-regulator",
 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
-- 
2.43.0