usb: misc: onboard-hub: support multiple power supplies

As some of the onboard hubs require multiple power supplies, provide the
environment to support them.

Signed-off-by: Benjamin Bara <benjamin.bara@skidata.com>
Acked-by: Matthias Kaehlcke <mka@chromium.org>
Link: https://lore.kernel.org/r/20230620-hx3-v7-1-f79b4b22a1bf@skidata.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/misc/onboard_usb_hub.c

@@ -27,6 +27,17 @@
 
 #include "onboard_usb_hub.h"
 
+/*
+ * Use generic names, as the actual names might differ between hubs. If a new
+ * hub requires more than the currently supported supplies, add a new one here.
+ */
+static const char * const supply_names[] = {
+	"vdd",
+	"vdd2",
+};
+
+#define MAX_SUPPLIES ARRAY_SIZE(supply_names)
+
 static void onboard_hub_attach_usb_driver(struct work_struct *work);
 
 static struct usb_device_driver onboard_hub_usbdev_driver;
@@ -40,7 +51,7 @@ struct usbdev_node {
 };
 
 struct onboard_hub {
-	struct regulator *vdd;
+	struct regulator_bulk_data supplies[MAX_SUPPLIES];
 	struct device *dev;
 	const struct onboard_hub_pdata *pdata;
 	struct gpio_desc *reset_gpio;
@@ -55,9 +66,9 @@ static int onboard_hub_power_on(struct onboard_hub *hub)
 {
 	int err;
 
-	err = regulator_enable(hub->vdd);
+	err = regulator_bulk_enable(hub->pdata->num_supplies, hub->supplies);
 	if (err) {
-		dev_err(hub->dev, "failed to enable regulator: %d\n", err);
+		dev_err(hub->dev, "failed to enable supplies: %d\n", err);
 		return err;
 	}
 
@@ -75,9 +86,9 @@ static int onboard_hub_power_off(struct onboard_hub *hub)
 
 	gpiod_set_value_cansleep(hub->reset_gpio, 1);
 
-	err = regulator_disable(hub->vdd);
+	err = regulator_bulk_disable(hub->pdata->num_supplies, hub->supplies);
 	if (err) {
-		dev_err(hub->dev, "failed to disable regulator: %d\n", err);
+		dev_err(hub->dev, "failed to disable supplies: %d\n", err);
 		return err;
 	}
 
@@ -232,6 +243,7 @@ static int onboard_hub_probe(struct platform_device *pdev)
 	const struct of_device_id *of_id;
 	struct device *dev = &pdev->dev;
 	struct onboard_hub *hub;
+	unsigned int i;
 	int err;
 
 	hub = devm_kzalloc(dev, sizeof(*hub), GFP_KERNEL);
@@ -246,9 +258,18 @@ static int onboard_hub_probe(struct platform_device *pdev)
 	if (!hub->pdata)
 		return -EINVAL;
 
-	hub->vdd = devm_regulator_get(dev, "vdd");
-	if (IS_ERR(hub->vdd))
-		return PTR_ERR(hub->vdd);
+	if (hub->pdata->num_supplies > MAX_SUPPLIES)
+		return dev_err_probe(dev, -EINVAL, "max %zu supplies supported!\n",
+				     MAX_SUPPLIES);
+
+	for (i = 0; i < hub->pdata->num_supplies; i++)
+		hub->supplies[i].supply = supply_names[i];
+
+	err = devm_regulator_bulk_get(dev, hub->pdata->num_supplies, hub->supplies);
+	if (err) {
+		dev_err(dev, "Failed to get regulator supplies: %d\n", err);
+		return err;
+	}
 
 	hub->reset_gpio = devm_gpiod_get_optional(dev, "reset",
 						  GPIOD_OUT_HIGH);

drivers/usb/misc/onboard_usb_hub.h

@@ -8,30 +8,37 @@
 
 struct onboard_hub_pdata {
 	unsigned long reset_us;		/* reset pulse width in us */
+	unsigned int num_supplies;	/* number of supplies */
 };
 
 static const struct onboard_hub_pdata microchip_usb424_data = {
 	.reset_us = 1,
+	.num_supplies = 1,
 };
 
 static const struct onboard_hub_pdata realtek_rts5411_data = {
 	.reset_us = 0,
+	.num_supplies = 1,
 };
 
 static const struct onboard_hub_pdata ti_tusb8041_data = {
 	.reset_us = 3000,
+	.num_supplies = 1,
 };
 
 static const struct onboard_hub_pdata genesys_gl850g_data = {
 	.reset_us = 3,
+	.num_supplies = 1,
 };
 
 static const struct onboard_hub_pdata genesys_gl852g_data = {
 	.reset_us = 50,
+	.num_supplies = 1,
 };
 
 static const struct onboard_hub_pdata vialab_vl817_data = {
 	.reset_us = 10,
+	.num_supplies = 1,
 };
 
 static const struct of_device_id onboard_hub_match[] = {