[PATCH 0/2] usb: gpio-sbu-mux: add FUSB340 and enable option for orientation

[PATCH 0/2] usb: gpio-sbu-mux: add FUSB340 and enable option for orientation

[Fabrice Gasnier]

Add a new compatible for FUSB340. Also mange the enable GPIO, when used as
orientation-switch only.
It is used on STM32MP25 DK boards, as orientation-switch only for
USB SuperSpeed lines on the Type-C connector, the enable GPIO being
connected to the SoC.

- - - - SoC - - - - - - - - - - board - - - - -
                        |                 USB-C
+------+  +----------+  |                   +-+
|      |--|  USB2PHY |<-----------------HS->|*|
|      |--|    HS    |<-----------------HS->|*|
|      |  +----------+  |                   | |
|      |                |    ________       | |
+ dwc3 |  +----------+  |   /        |<-SS->|*|
|      |  |          |<--->/         |<-SS->|*|
|      |--| ComboPHY |<--->  FUSB340 |      | |
|      |  |    SS    |  |  \  __     |<-SS->|*|
+------+  +----------+  |   \_en__sw_|<-SS->|*|
                        |     ^   ^         | |
          +----------+  |     |   |         ...
          [   GPIO   ]--------+   |
          [   GPIO   ]------------+
          +----------+  |
- - - - - - - - - - - - - - - - - - - - - - --

This is a subset of STM32MP25 Type-C support [1].

[1] https://lore.kernel.org/all/20260821-ucpd-host-fusb340-v7-2-rfc-v1-0-c5e27cbc0795@foss.st.com/

---
Fabrice Gasnier (2):
      dt-bindings: usb: gpio-sbu-mux: Add compatible for FUSB340
      usb: typec: mux: gpio-sbu: enable when only used for orientation

 Documentation/devicetree/bindings/usb/gpio-sbu-mux.yaml | 1 +
 drivers/usb/typec/mux/gpio-sbu-mux.c                    | 7 +++++++
 2 files changed, 8 insertions(+)
---
base-commit: 8d3ae59288f1e7d58d76558a6ee96d533bc5019f
change-id: 20260825-usb-fusb340-v1-f060a5f84d3c

Best regards,
--  
Fabrice Gasnier <fabrice.gasnier@foss.st.com>

[PATCH 1/2] dt-bindings: usb: gpio-sbu-mux: Add compatible for FUSB340

[Fabrice Gasnier]

Add a compatible for the FUSB340 GPIO-based 2:1 SuperSpeed switch
with enable-gpios and select-gpios controls. The switch can be used
in Type-C applications where a reversible cable requires a switch.

Suggested-by: Marek Vasut <marex@nabladev.com>
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
---
 Documentation/devicetree/bindings/usb/gpio-sbu-mux.yaml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/usb/gpio-sbu-mux.yaml b/Documentation/devicetree/bindings/usb/gpio-sbu-mux.yaml
index 793662f6f3bf..c0e60848d8ab 100644
--- a/Documentation/devicetree/bindings/usb/gpio-sbu-mux.yaml
+++ b/Documentation/devicetree/bindings/usb/gpio-sbu-mux.yaml
@@ -22,6 +22,7 @@ properties:
           - nxp,cbdtu02043
           - onnn,fsusb42
           - onnn,fsusb43l10x
+          - onnn,fusb340
           - pericom,pi3usb102
           - ti,tmuxhs4212
       - const: gpio-sbu-mux

-- 
2.43.0

Re: [PATCH 1/2] dt-bindings: usb: gpio-sbu-mux: Add compatible for FUSB340

[Conor Dooley]

[-- Attachment #1: Type: text/plain, Size: 75 bytes --]

Acked-by: Conor Dooley <conor.dooley@microchip.com>
pw-bot: not-applicable

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 228 bytes --]

[PATCH 2/2] usb: typec: mux: gpio-sbu: enable when only used for orientation

[Fabrice Gasnier]

When used as orientation-switch only (no mode-switch, e.g. no altmode),
the optional enable gpio remains disabled.
Enable it from the switch_set() routine, in this case, when the
orientation is set and the enable-gpios property has been provided.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
---
 drivers/usb/typec/mux/gpio-sbu-mux.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/usb/typec/mux/gpio-sbu-mux.c b/drivers/usb/typec/mux/gpio-sbu-mux.c
index 1834f1a2dd9d..4151d78e3b8d 100644
--- a/drivers/usb/typec/mux/gpio-sbu-mux.c
+++ b/drivers/usb/typec/mux/gpio-sbu-mux.c
@@ -17,6 +17,7 @@ struct gpio_sbu_mux {
 
 	struct typec_switch_dev *sw;
 	struct typec_mux_dev *mux;
+	bool mode_switch;
 
 	struct mutex lock; /* protect enabled and swapped */
 	bool enabled;
@@ -40,9 +41,13 @@ static int gpio_sbu_switch_set(struct typec_switch_dev *sw,
 		enabled = false;
 		break;
 	case TYPEC_ORIENTATION_NORMAL:
+		if (!sbu_mux->mode_switch)
+			enabled = true;
 		swapped = false;
 		break;
 	case TYPEC_ORIENTATION_REVERSE:
+		if (!sbu_mux->mode_switch)
+			enabled = true;
 		swapped = true;
 		break;
 	}
@@ -125,6 +130,8 @@ static int gpio_sbu_mux_probe(struct platform_device *pdev)
 		return dev_err_probe(dev, PTR_ERR(sbu_mux->sw),
 				     "failed to register typec switch\n");
 
+	sbu_mux->mode_switch = device_property_read_bool(dev, "mode-switch");
+
 	mux_desc.drvdata = sbu_mux;
 	mux_desc.fwnode = dev_fwnode(dev);
 	mux_desc.set = gpio_sbu_mux_set;

-- 
2.43.0

Re: [PATCH 2/2] usb: typec: mux: gpio-sbu: enable when only used for orientation

[Heikki Krogerus]

On Tue, Aug 25, 2026 at 02:54:24PM +0200, Fabrice Gasnier wrote:
> When used as orientation-switch only (no mode-switch, e.g. no altmode),
> the optional enable gpio remains disabled.
> Enable it from the switch_set() routine, in this case, when the
> orientation is set and the enable-gpios property has been provided.
> 
> Signed-off-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>

Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>

> ---
>  drivers/usb/typec/mux/gpio-sbu-mux.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/usb/typec/mux/gpio-sbu-mux.c b/drivers/usb/typec/mux/gpio-sbu-mux.c
> index 1834f1a2dd9d..4151d78e3b8d 100644
> --- a/drivers/usb/typec/mux/gpio-sbu-mux.c
> +++ b/drivers/usb/typec/mux/gpio-sbu-mux.c
> @@ -17,6 +17,7 @@ struct gpio_sbu_mux {
>  
>  	struct typec_switch_dev *sw;
>  	struct typec_mux_dev *mux;
> +	bool mode_switch;
>  
>  	struct mutex lock; /* protect enabled and swapped */
>  	bool enabled;
> @@ -40,9 +41,13 @@ static int gpio_sbu_switch_set(struct typec_switch_dev *sw,
>  		enabled = false;
>  		break;
>  	case TYPEC_ORIENTATION_NORMAL:
> +		if (!sbu_mux->mode_switch)
> +			enabled = true;
>  		swapped = false;
>  		break;
>  	case TYPEC_ORIENTATION_REVERSE:
> +		if (!sbu_mux->mode_switch)
> +			enabled = true;
>  		swapped = true;
>  		break;
>  	}
> @@ -125,6 +130,8 @@ static int gpio_sbu_mux_probe(struct platform_device *pdev)
>  		return dev_err_probe(dev, PTR_ERR(sbu_mux->sw),
>  				     "failed to register typec switch\n");
>  
> +	sbu_mux->mode_switch = device_property_read_bool(dev, "mode-switch");
> +
>  	mux_desc.drvdata = sbu_mux;
>  	mux_desc.fwnode = dev_fwnode(dev);
>  	mux_desc.set = gpio_sbu_mux_set;
> 
> -- 
> 2.43.0

-- 
heikki