[PATCH v2 0/3] usb: misc: onboard_usb_hub: add support for Cypress HX3 USB 3.0 family

[PATCH v2 0/3] usb: misc: onboard_usb_hub: add support for Cypress HX3 USB 3.0 family

[Benjamin Bara]

Hi!

This series adds support for the Cypress HX3 USB 3.0 family (2/3). For
now, it just contains the USB-related aspects and ignores the option to
connect it via i2c (3/3).

As the HX3 family operates with two power supplies, multiple power
supply support is implemented (1/3).

Thanks & best regards,
Benjamin

---
Changes in v2:
- don't re-order by VID/PID
- 1/3: replace (err != 0) with (err)
- Link to v1: https://lore.kernel.org/r/20230620-hx3-v1-0-3a649b34c85b@skidata.com

---
Benjamin Bara (3):
      usb: misc: onboard-hub: support multiple power supplies
      usb: misc: onboard-hub: add support for Cypress HX3 USB 3.0 family
      dt-bindings: usb: Add binding for Cypress HX3 USB 3.0 family

 .../devicetree/bindings/usb/cypress,hx3.yaml       | 77 ++++++++++++++++++++++
 drivers/usb/misc/onboard_usb_hub.c                 | 39 ++++++++---
 drivers/usb/misc/onboard_usb_hub.h                 |  8 +++
 3 files changed, 116 insertions(+), 8 deletions(-)
---
base-commit: 45a3e24f65e90a047bef86f927ebdc4c710edaa1
change-id: 20230620-hx3-cb935b4fdd76

Best regards,
-- 
Benjamin Bara <benjamin.bara@skidata.com>

[PATCH v2 1/3] usb: misc: onboard-hub: support multiple power supplies

[Benjamin Bara]

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

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>
---
v2:
- replace (err != 0) with (err)
---
 drivers/usb/misc/onboard_usb_hub.c | 36 ++++++++++++++++++++++++++++--------
 drivers/usb/misc/onboard_usb_hub.h |  1 +
 2 files changed, 29 insertions(+), 8 deletions(-)

diff --git a/drivers/usb/misc/onboard_usb_hub.c b/drivers/usb/misc/onboard_usb_hub.c
index 12fc6eb67c3b..3de30356a684 100644
--- a/drivers/usb/misc/onboard_usb_hub.c
+++ b/drivers/usb/misc/onboard_usb_hub.c
@@ -27,6 +27,12 @@
 
 #include "onboard_usb_hub.h"
 
+#define SUPPLIES_NUM_MAX 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 +46,8 @@ struct usbdev_node {
 };
 
 struct onboard_hub {
-	struct regulator *vdd;
+	struct regulator_bulk_data supplies[SUPPLIES_NUM_MAX];
+	unsigned int supplies_num;
 	struct device *dev;
 	const struct onboard_hub_pdata *pdata;
 	struct gpio_desc *reset_gpio;
@@ -55,9 +62,9 @@ static int onboard_hub_power_on(struct onboard_hub *hub)
 {
 	int err;
 
-	err = regulator_enable(hub->vdd);
+	err = regulator_bulk_enable(hub->supplies_num, 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 +82,9 @@ 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->supplies_num, 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 +239,7 @@ 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 +254,21 @@ 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->supplies_num > SUPPLIES_NUM_MAX)
+		return dev_err_probe(dev, -EINVAL, "max %d supplies supported!\n",
+				     SUPPLIES_NUM_MAX);
+	hub->supplies_num = 1;
+	if (hub->pdata->supplies_num > 1)
+		hub->supplies_num = hub->pdata->supplies_num;
+
+	for (i = 0; i < SUPPLIES_NUM_MAX; i++)
+		hub->supplies[i].supply = supply_names[i];
+
+	err = devm_regulator_bulk_get(dev, hub->supplies_num, 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..657190bf1799 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 supplies_num;	/* num of supplies: 0 considered as 1 */
 };
 
 static const struct onboard_hub_pdata microchip_usb424_data = {

-- 
2.34.1

[PATCH v2 2/3] usb: misc: onboard-hub: add support for Cypress HX3 USB 3.0 family

[Benjamin Bara]

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

The HX3 comes in different variants (up to 4 USB 3.0 ports; multi-TT),
e.g. CYUSB330x/CYUSB331x/CYUSB332x/CYUSB230x. It operates with two
different power supplies: 1V2 and 3V3.

Add the support for this hub, for controlling the reset pin and the
power supplies.

Reset time is extracted from data sheet, page 24:
"The RESETN pin can be tied to VDD_IO through an external resistor and
to ground (GND) through an external capacitor (minimum 5 ms time
constant)."
V_IH min is given at 0.7 * 3V3 (page 34), therefore use 10ms.

Also add USB PIDs for the USB 2.0 and USB 3.0 root hub.

Signed-off-by: Benjamin Bara <benjamin.bara@skidata.com>
---
 drivers/usb/misc/onboard_usb_hub.c | 3 +++
 drivers/usb/misc/onboard_usb_hub.h | 7 +++++++
 2 files changed, 10 insertions(+)

diff --git a/drivers/usb/misc/onboard_usb_hub.c b/drivers/usb/misc/onboard_usb_hub.c
index 3de30356a684..06e448b7e8cf 100644
--- a/drivers/usb/misc/onboard_usb_hub.c
+++ b/drivers/usb/misc/onboard_usb_hub.c
@@ -349,6 +349,7 @@ static struct platform_driver onboard_hub_driver = {
 
 /************************** USB driver **************************/
 
+#define VENDOR_ID_CYPRESS	0x04b4
 #define VENDOR_ID_GENESYS	0x05e3
 #define VENDOR_ID_MICROCHIP	0x0424
 #define VENDOR_ID_REALTEK	0x0bda
@@ -427,6 +428,8 @@ static void onboard_hub_usbdev_disconnect(struct usb_device *udev)
 }
 
 static const struct usb_device_id onboard_hub_id_table[] = {
+	{ USB_DEVICE(VENDOR_ID_CYPRESS, 0x6504) }, /* CYUSB33{0,1,2}x/CYUSB230x 3.0 */
+	{ USB_DEVICE(VENDOR_ID_CYPRESS, 0x6506) }, /* CYUSB33{0,1,2}x/CYUSB230x 2.0 */
 	{ USB_DEVICE(VENDOR_ID_GENESYS, 0x0608) }, /* Genesys Logic GL850G USB 2.0 */
 	{ USB_DEVICE(VENDOR_ID_GENESYS, 0x0610) }, /* Genesys Logic GL852G USB 2.0 */
 	{ USB_DEVICE(VENDOR_ID_MICROCHIP, 0x2514) }, /* USB2514B USB 2.0 */
diff --git a/drivers/usb/misc/onboard_usb_hub.h b/drivers/usb/misc/onboard_usb_hub.h
index 657190bf1799..145e476b1d6c 100644
--- a/drivers/usb/misc/onboard_usb_hub.h
+++ b/drivers/usb/misc/onboard_usb_hub.h
@@ -23,6 +23,11 @@ static const struct onboard_hub_pdata ti_tusb8041_data = {
 	.reset_us = 3000,
 };
 
+static const struct onboard_hub_pdata cypress_hx3_data = {
+	.reset_us = 10000,
+	.supplies_num = 2,
+};
+
 static const struct onboard_hub_pdata genesys_gl850g_data = {
 	.reset_us = 3,
 };
@@ -40,6 +45,8 @@ static const struct of_device_id onboard_hub_match[] = {
 	{ .compatible = "usb424,2517", .data = &microchip_usb424_data, },
 	{ .compatible = "usb451,8140", .data = &ti_tusb8041_data, },
 	{ .compatible = "usb451,8142", .data = &ti_tusb8041_data, },
+	{ .compatible = "usb4b4,6504", .data = &cypress_hx3_data, },
+	{ .compatible = "usb4b4,6506", .data = &cypress_hx3_data, },
 	{ .compatible = "usb5e3,608", .data = &genesys_gl850g_data, },
 	{ .compatible = "usb5e3,610", .data = &genesys_gl852g_data, },
 	{ .compatible = "usbbda,411", .data = &realtek_rts5411_data, },

-- 
2.34.1

[PATCH v2 3/3] dt-bindings: usb: Add binding for Cypress HX3 USB 3.0 family

[Benjamin Bara]

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

The HX3 family comes in different variants (up to 4 USB 3.0 ports;
multi-TT), e.g. CYUSB330x/CYUSB331x/CYUSB332x/CYUSB230x.

This initial version of the binding only describes USB related aspects
of the HX3 family, it does not cover the option of connecting the
controller as an i2c slave.

Signed-off-by: Benjamin Bara <benjamin.bara@skidata.com>
---
 .../devicetree/bindings/usb/cypress,hx3.yaml       | 77 ++++++++++++++++++++++
 1 file changed, 77 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/cypress,hx3.yaml b/Documentation/devicetree/bindings/usb/cypress,hx3.yaml
new file mode 100644
index 000000000000..47add0d85fb8
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/cypress,hx3.yaml
@@ -0,0 +1,77 @@
+# SPDX-License-Identifier: GPL-2.0-only or BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/usb/cypress,hx3.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Cypress HX3 USB 3.0 hub controller family
+
+maintainers:
+  - Benjamin Bara <benjamin.bara@skidata.com>
+
+allOf:
+  - $ref: usb-device.yaml#
+
+properties:
+  compatible:
+    enum:
+      - usb4b4,6504
+      - usb4b4,6506
+
+  reg: true
+
+  reset-gpios:
+    items:
+      - description: GPIO specifier for RESETN pin.
+
+  vdd-supply:
+    description:
+      1V2 power supply (VDD_EFUSE, AVDD12, DVDD12).
+
+  vdd2-supply:
+    description:
+      3V3 power supply (AVDD33, VDD_IO).
+
+  peer-hub:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      phandle to the peer hub on the controller.
+
+required:
+  - compatible
+  - reg
+  - peer-hub
+  - vdd-supply
+  - vdd2-supply
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    usb {
+        dr_mode = "host";
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        /* 2.0 hub on port 1 */
+        hub_2_0: hub@1 {
+          compatible = "usb4b4,6504";
+          reg = <1>;
+          peer-hub = <&hub_3_0>;
+          reset-gpios = <&gpio1 11 GPIO_ACTIVE_LOW>;
+          vdd-supply = <&reg_1v2_usb>;
+          vdd2-supply = <&reg_3v3_usb>;
+        };
+
+        /* 3.0 hub on port 2 */
+        hub_3_0: hub@2 {
+          compatible = "usb4b4,6506";
+          reg = <2>;
+          peer-hub = <&hub_2_0>;
+          reset-gpios = <&gpio1 11 GPIO_ACTIVE_LOW>;
+          vdd-supply = <&reg_1v2_usb>;
+          vdd2-supply = <&reg_3v3_usb>;
+        };
+    };

-- 
2.34.1

Re: [PATCH v2 1/3] usb: misc: onboard-hub: support multiple power supplies

[Matthias Kaehlcke]

Hi,

On Wed, Jun 21, 2023 at 04:26:27PM +0200, Benjamin Bara wrote:
> From: Benjamin Bara <benjamin.bara@skidata.com>
>
> 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>

Overall this looks good to me, a few nits inside.

> ---
> v2:
> - replace (err != 0) with (err)
> ---
>  drivers/usb/misc/onboard_usb_hub.c | 36 ++++++++++++++++++++++++++++--------
>  drivers/usb/misc/onboard_usb_hub.h |  1 +
>  2 files changed, 29 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/usb/misc/onboard_usb_hub.c b/drivers/usb/misc/onboard_usb_hub.c
> index 12fc6eb67c3b..3de30356a684 100644
> --- a/drivers/usb/misc/onboard_usb_hub.c
> +++ b/drivers/usb/misc/onboard_usb_hub.c
> @@ -27,6 +27,12 @@
>  
>  #include "onboard_usb_hub.h"
>  
> +#define SUPPLIES_NUM_MAX 2

MAX_SUPPLIES?

add empty line

> +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 +46,8 @@ struct usbdev_node {
>  };
>  
>  struct onboard_hub {
> -	struct regulator *vdd;
> +	struct regulator_bulk_data supplies[SUPPLIES_NUM_MAX];
> +	unsigned int supplies_num;

num_supplies?

>  	struct device *dev;
>  	const struct onboard_hub_pdata *pdata;
>  	struct gpio_desc *reset_gpio;
> @@ -55,9 +62,9 @@ static int onboard_hub_power_on(struct onboard_hub *hub)
>  {
>  	int err;
>  
> -	err = regulator_enable(hub->vdd);
> +	err = regulator_bulk_enable(hub->supplies_num, 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 +82,9 @@ 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->supplies_num, 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 +239,7 @@ 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 +254,21 @@ 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->supplies_num > SUPPLIES_NUM_MAX)
> +		return dev_err_probe(dev, -EINVAL, "max %d supplies supported!\n",
> +				     SUPPLIES_NUM_MAX);
> +	hub->supplies_num = 1;
> +	if (hub->pdata->supplies_num > 1)
> +		hub->supplies_num = hub->pdata->supplies_num;

Please change the above to:

	if (hub->pdata->supplies_num != 0)
		hub->supplies_num = hub->pdata->supplies_num;
	else
		hub->supplies_num = 1;

> +
> +	for (i = 0; i < SUPPLIES_NUM_MAX; i++)
> +		hub->supplies[i].supply = supply_names[i];
> +
> +	err = devm_regulator_bulk_get(dev, hub->supplies_num, 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..657190bf1799 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 supplies_num;	/* num of supplies: 0 considered as 1 */

num_supplies?

s/num of/number of/

>  };

Re: [PATCH v2 2/3] usb: misc: onboard-hub: add support for Cypress HX3 USB 3.0 family

[Matthias Kaehlcke]

On Wed, Jun 21, 2023 at 04:26:28PM +0200, Benjamin Bara wrote:
> From: Benjamin Bara <benjamin.bara@skidata.com>
> 
> The HX3 comes in different variants (up to 4 USB 3.0 ports; multi-TT),
> e.g. CYUSB330x/CYUSB331x/CYUSB332x/CYUSB230x. It operates with two
> different power supplies: 1V2 and 3V3.
> 
> Add the support for this hub, for controlling the reset pin and the
> power supplies.
> 
> Reset time is extracted from data sheet, page 24:
> "The RESETN pin can be tied to VDD_IO through an external resistor and
> to ground (GND) through an external capacitor (minimum 5 ms time
> constant)."
> V_IH min is given at 0.7 * 3V3 (page 34), therefore use 10ms.
> 
> Also add USB PIDs for the USB 2.0 and USB 3.0 root hub.
> 
> Signed-off-by: Benjamin Bara <benjamin.bara@skidata.com>

Acked-by: Matthias Kaehlcke <mka@chromium.org>

Re: [PATCH v2 1/3] usb: misc: onboard-hub: support multiple power supplies

[Benjamin Bara]

Hi,

thanks for the feedback!

On Wed, 21 Jun 2023 at 16:57, Matthias Kaehlcke <mka@chromium.org> wrote:
> On Wed, Jun 21, 2023 at 04:26:27PM +0200, Benjamin Bara wrote:
> > +     hub->supplies_num = 1;
> > +     if (hub->pdata->supplies_num > 1)
> > +             hub->supplies_num = hub->pdata->supplies_num;
>
> Please change the above to:
>
>         if (hub->pdata->supplies_num != 0)
>                 hub->supplies_num = hub->pdata->supplies_num;
>         else
>                 hub->supplies_num = 1;
>

I would even prefer:
if (hub->pdata->supplies_num)

if it's fine for you?

Re: [PATCH v2 1/3] usb: misc: onboard-hub: support multiple power supplies

[Matthias Kaehlcke]

On Wed, Jun 21, 2023 at 05:45:05PM +0200, Benjamin Bara wrote:
> Hi,
> 
> thanks for the feedback!
> 
> On Wed, 21 Jun 2023 at 16:57, Matthias Kaehlcke <mka@chromium.org> wrote:
> > On Wed, Jun 21, 2023 at 04:26:27PM +0200, Benjamin Bara wrote:
> > > +     hub->supplies_num = 1;
> > > +     if (hub->pdata->supplies_num > 1)
> > > +             hub->supplies_num = hub->pdata->supplies_num;
> >
> > Please change the above to:
> >
> >         if (hub->pdata->supplies_num != 0)
> >                 hub->supplies_num = hub->pdata->supplies_num;
> >         else
> >                 hub->supplies_num = 1;
> >
> 
> I would even prefer:
> if (hub->pdata->supplies_num)
> 
> if it's fine for you?

Sounds good to me :)

Re: [PATCH v2 1/3] usb: misc: onboard-hub: support multiple power supplies

[Alexander Stein]

Hi,

Am Mittwoch, 21. Juni 2023, 16:57:03 CEST schrieb Matthias Kaehlcke:
> ********************
> Achtung externe E-Mail: Öffnen Sie Anhänge und Links nur, wenn Sie wissen,
> dass diese aus einer sicheren Quelle stammen und sicher sind. Leiten Sie
> die E-Mail im Zweifelsfall zur Prüfung an den IT-Helpdesk weiter.
> Attention external email: Open attachments and links only if you know that
> they are from a secure source and are safe. In doubt forward the email to
> the IT-Helpdesk to check it. ********************
> 
> Hi,
> 
> On Wed, Jun 21, 2023 at 04:26:27PM +0200, Benjamin Bara wrote:
> > From: Benjamin Bara <benjamin.bara@skidata.com>
> > 
> > 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>
> 
> Overall this looks good to me, a few nits inside.
> 
> > ---
> > v2:
> > - replace (err != 0) with (err)
> > ---
> > 
> >  drivers/usb/misc/onboard_usb_hub.c | 36
> >  ++++++++++++++++++++++++++++-------- drivers/usb/misc/onboard_usb_hub.h
> >  |  1 +
> >  2 files changed, 29 insertions(+), 8 deletions(-)
> > 
> > diff --git a/drivers/usb/misc/onboard_usb_hub.c
> > b/drivers/usb/misc/onboard_usb_hub.c index 12fc6eb67c3b..3de30356a684
> > 100644
> > --- a/drivers/usb/misc/onboard_usb_hub.c
> > +++ b/drivers/usb/misc/onboard_usb_hub.c
> > @@ -27,6 +27,12 @@
> > 
> >  #include "onboard_usb_hub.h"
> > 
> > +#define SUPPLIES_NUM_MAX 2
> 
> MAX_SUPPLIES?

Do we need this MAX_SUPPLIES macro at all? This essentially is 
ARRAY_SIZE(supply_names), no? At least it should be
> #define MAX_SUPPLIES ARRAY_SIZE(supply_names)

> 
> add empty line
> 
> > +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 +46,8 @@ struct usbdev_node {
> > 
> >  };
> >  
> >  struct onboard_hub {
> > 
> > -	struct regulator *vdd;
> > +	struct regulator_bulk_data supplies[SUPPLIES_NUM_MAX];
> > +	unsigned int supplies_num;
> 
> num_supplies?
> 
> >  	struct device *dev;
> >  	const struct onboard_hub_pdata *pdata;
> >  	struct gpio_desc *reset_gpio;
> > 
> > @@ -55,9 +62,9 @@ static int onboard_hub_power_on(struct onboard_hub *hub)
> > 
> >  {
> >  
> >  	int err;
> > 
> > -	err = regulator_enable(hub->vdd);
> > +	err = regulator_bulk_enable(hub->supplies_num, 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 +82,9 @@ 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->supplies_num, 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 +239,7 @@ 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 +254,21 @@ 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->supplies_num > SUPPLIES_NUM_MAX)
> > +		return dev_err_probe(dev, -EINVAL, "max %d supplies 
supported!\n",
> > +				     SUPPLIES_NUM_MAX);
> > +	hub->supplies_num = 1;
> > +	if (hub->pdata->supplies_num > 1)
> > +		hub->supplies_num = hub->pdata->supplies_num;
> 
> Please change the above to:
> 
> 	if (hub->pdata->supplies_num != 0)
> 		hub->supplies_num = hub->pdata->supplies_num;
> 	else
> 		hub->supplies_num = 1;
> 

In the kernel there is also this style:
> hub->supplies_num = hub->pdata->supplies_num? : 1;

But it's up to you which one you prefer.

Best regards,
Alexander

> > +
> > +	for (i = 0; i < SUPPLIES_NUM_MAX; i++)
> > +		hub->supplies[i].supply = supply_names[i];
> > +
> > +	err = devm_regulator_bulk_get(dev, hub->supplies_num, 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..657190bf1799
> > 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 supplies_num;	/* num of supplies: 0 considered as 1 
*/
> 
> num_supplies?
> 
> s/num of/number of/
> 
> >  };


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http://www.tq-group.com/

Re: [PATCH v2 1/3] usb: misc: onboard-hub: support multiple power supplies

[Benjamin Bara]

Hi!

Thank you for the feedback!

On Thu, 22 Jun 2023 at 07:16, Alexander Stein <alexander.stein@ew.tq-group.com> wrote:
> Am Mittwoch, 21. Juni 2023, 16:57:03 CEST schrieb Matthias Kaehlcke:
> > > +#define SUPPLIES_NUM_MAX 2
> >
> > MAX_SUPPLIES?
>
> Do we need this MAX_SUPPLIES macro at all? This essentially is
> ARRAY_SIZE(supply_names), no? At least it should be
> > #define MAX_SUPPLIES ARRAY_SIZE(supply_names)

Thanks for the catch, will adapt.

> >       if (hub->pdata->supplies_num != 0)
> >               hub->supplies_num = hub->pdata->supplies_num;
> >       else
> >               hub->supplies_num = 1;
> >
>
> In the kernel there is also this style:
> > hub->supplies_num = hub->pdata->supplies_num? : 1;

I dropped it in v4[1].

br,
Benjamin

[1] https://lore.kernel.org/lkml/20230620-hx3-v4-0-e56b3c6db60b@skidata.com/