linux-kernel - [PATCH v3 1/3] usb: misc: onboard-hub: support multiple power supplies

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Message-Id: <20230620-hx3-v3-1-2acbc03ca949@skidata.com>
Date:   Wed, 21 Jun 2023 17:58:30 +0200
From:   Benjamin Bara <bbara93@...il.com>
To:     Matthias Kaehlcke <mka@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Benjamin Bara <benjamin.bara@...data.com>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: [PATCH v3 1/3] usb: misc: onboard-hub: support multiple power
 supplies

From: Benjamin Bara <benjamin.bara@...data.com>

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

Signed-off-by: Benjamin Bara <benjamin.bara@...data.com>
---
v3:
- fix nits mentioned in v2

v2:
- replace (err != 0) with (err)
---
 drivers/usb/misc/onboard_usb_hub.c | 39 ++++++++++++++++++++++++++++++--------
 drivers/usb/misc/onboard_usb_hub.h |  1 +
 2 files changed, 32 insertions(+), 8 deletions(-)

diff --git a/drivers/usb/misc/onboard_usb_hub.c b/drivers/usb/misc/onboard_usb_hub.c
index 12fc6eb67c3b..a56e712d3a45 100644
--- a/drivers/usb/misc/onboard_usb_hub.c
+++ b/drivers/usb/misc/onboard_usb_hub.c
@@ -27,6 +27,13 @@
 
 #include "onboard_usb_hub.h"
 
+#define MAX_SUPPLIES 2
+
+static const char * const supply_names[] = {
+	"vdd",
+	"vdd2",
+};
+
 static void onboard_hub_attach_usb_driver(struct work_struct *work);
 
 static struct usb_device_driver onboard_hub_usbdev_driver;
@@ -40,7 +47,8 @@ struct usbdev_node {
 };
 
 struct onboard_hub {
-	struct regulator *vdd;
+	struct regulator_bulk_data supplies[MAX_SUPPLIES];
+	unsigned int num_supplies;
 	struct device *dev;
 	const struct onboard_hub_pdata *pdata;
 	struct gpio_desc *reset_gpio;
@@ -55,9 +63,9 @@ static int onboard_hub_power_on(struct onboard_hub *hub)
 {
 	int err;
 
-	err = regulator_enable(hub->vdd);
+	err = regulator_bulk_enable(hub->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 +83,9 @@ 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->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 +240,7 @@ 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 +255,23 @@ 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 %d supplies supported!\n",
+				     MAX_SUPPLIES);
+
+	if (hub->pdata->num_supplies)
+		hub->num_supplies = hub->pdata->num_supplies;
+	else
+		hub->num_supplies = 1;
+
+	for (i = 0; i < MAX_SUPPLIES; i++)
+		hub->supplies[i].supply = supply_names[i];
+
+	err = devm_regulator_bulk_get(dev, hub->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);
diff --git a/drivers/usb/misc/onboard_usb_hub.h b/drivers/usb/misc/onboard_usb_hub.h
index aca5f50eb0da..7a6d497ce849 100644
--- a/drivers/usb/misc/onboard_usb_hub.h
+++ b/drivers/usb/misc/onboard_usb_hub.h
@@ -8,6 +8,7 @@
 
 struct onboard_hub_pdata {
 	unsigned long reset_us;		/* reset pulse width in us */
+	unsigned int num_supplies;	/* number of supplies: 0 considered as 1 */
 };
 
 static const struct onboard_hub_pdata microchip_usb424_data = {

-- 
2.34.1