[PATCH v3 5/9] 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(). Register
a separate rzg3l-usb-vbus-regulator platform driver backed by this probe
function.

The existing rzg2l_usb_vbus_regulator_probe() and its platform driver
are unchanged and continue to handle the single regulator-vbus case for
all other SoCs.

Signed-off-by: Biju Das <[email protected]>
---
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    | 53 +++++++++++++++++++
 1 file changed, 53 insertions(+)

diff --git a/drivers/regulator/renesas-usb-vbus-regulator.c b/drivers/regulator/renesas-usb-vbus-regulator.c
index 9ba791bd72ec..902834000874 100644
--- a/drivers/regulator/renesas-usb-vbus-regulator.c
+++ b/drivers/regulator/renesas-usb-vbus-regulator.c
@@ -55,6 +55,50 @@ 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)) {
+			dev_err(dev, "failed to register %s regulator\n",
+				rzg3l_usb_vbus_regulators[i].name);
+			return PTR_ERR(rdev);
+		}
+	}
+
+	return 0;
+}
+
 static struct platform_driver rzg2l_usb_vbus_regulator_driver = {
 	.probe = rzg2l_usb_vbus_regulator_probe,
 	.driver	= {
@@ -64,6 +108,15 @@ static struct platform_driver rzg2l_usb_vbus_regulator_driver = {
 };
 module_platform_driver(rzg2l_usb_vbus_regulator_driver);
 
+static struct platform_driver rzg3l_usb_vbus_regulator_driver = {
+	.probe = rzg3l_usb_vbus_regulator_probe,
+	.driver	= {
+		.name = "rzg3l-usb-vbus-regulator",
+		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
+	},
+};
+module_platform_driver(rzg3l_usb_vbus_regulator_driver);
+
 MODULE_AUTHOR("Biju Das <[email protected]>");
 MODULE_DESCRIPTION("Renesas RZ/G2L USB Vbus Regulator Driver");
 MODULE_LICENSE("GPL");
-- 
2.43.0