Re: [PATCH 02/16] usb: typec: tcpm: Add STM32 tcpp driver

[Marek Vasut]

On 8/21/26 6:23 PM, Fabrice Gasnier wrote:
> From: Christian Bruel <christian.bruel@xxxxxxxxxxx>
>
> Add support for the STMicroelectronics TCPP02 and TCPP03 USB-C PD
> protection for dual role power (DRP).
> It can be used with the STM32 family embedding UCPD controller.

[...]

> +++ b/drivers/usb/typec/tcpm/st_tcpp.h
> @@ -0,0 +1,21 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * Copyright (C) 2026 STMicroelectronics
> + */
> +
> +#ifndef __ST_TCPP_H__
> +#define __ST_TCPP_H__
> +
> +typedef void (*tcpp_vbus_cb_t)(void *data, bool vbus_present);
> +
> +int tcpp_init(struct device *tcpp);
> +void tcpp_deinit(struct device *tcpp);
> +int tcpp_get_vbus(struct device *tcpp);
> +int tcpp_set_vbus(struct device *tcpp, bool on, bool charge);
> +int tcpp_set_vconn(struct device *dev, bool on, enum typec_cc_polarity polarity);
> +int tcpp_attach(struct device *tcpp);
> +int tcpp_detach(struct device *tcpp);
> +int tcpp_register_vbus_notifier(struct device *dev, tcpp_vbus_cb_t cb, void *data);
> +void tcpp_unregister_vbus_notifier(struct device *dev);
Model the TCPP as four GPIOs and you won't need any of this 
horribleness. Have a look at the UCPD driver I posted two days ago, 
"[PATCH 2/4] usb: typec: ucpd: Add ST UCPD driver", it operates TCPP 
exactly that way.