linux-kernel - Re: [PATCH] platform/chrome: cros_ec_typec: Add support for setting USB mode via sysfs

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Message-ID: <Z7SYg8HaSVx9QyH9@tzungbi-laptop>
Date: Tue, 18 Feb 2025 22:26:11 +0800
From: Tzung-Bi Shih <tzungbi@...nel.org>
To: Andrei Kuchynski <akuchynski@...omium.org>
Cc: Prashant Malani <pmalani@...omium.org>,
	Benson Leung <bleung@...omium.org>,
	Abhishek Pandit-Subedi <abhishekpandit@...omium.org>,
	chrome-platform@...ts.linux.dev, Jameson Thies <jthies@...gle.com>,
	Łukasz Bartosik <ukaszb@...omium.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] platform/chrome: cros_ec_typec: Add support for setting
 USB mode via sysfs

On Mon, Feb 10, 2025 at 01:04:19PM +0000, Andrei Kuchynski wrote:
> +static int cros_typec_enter_usb_mode(struct typec_port *tc_port, enum usb_mode mode)
> +{
> +	struct cros_typec_port *port = typec_get_drvdata(tc_port);
> +	struct ec_params_typec_control req = {
> +		.port = port->port_num,
> +		.command = (mode == USB_MODE_USB4) ?
> +			TYPEC_CONTROL_COMMAND_ENTER_MODE : TYPEC_CONTROL_COMMAND_EXIT_MODES,
> +		.mode_to_enter = CROS_EC_ALTMODE_USB4

The symbol `CROS_EC_ALTMODE_USB4` doesn't exist.  On a related note, wouldn't
it always enter CROS_EC_ALTMODE_USB4 if the value is hard-coded here?

> @@ -84,6 +102,13 @@ static int cros_typec_parse_port_props(struct typec_capability *cap,
>  		cap->prefer_role = ret;
>  	}
>  
> +	if (fwnode_property_present(fwnode, "usb2-port"))
> +		cap->usb_capability |= USB_CAPABILITY_USB2;
> +	if (fwnode_property_present(fwnode, "usb3-port"))
> +		cap->usb_capability |= USB_CAPABILITY_USB3;
> +	if (fwnode_property_present(fwnode, "usb4-port"))
> +		cap->usb_capability |= USB_CAPABILITY_USB4;

Are these defined somewhere?  E.g. the bindings?