linux-kernel - Re: [PATCH v2 3/4] usb: typec: Factor out non-PD fwnode properties

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Date:   Wed, 9 Feb 2022 13:41:18 +0200
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Samuel Holland <samuel@...lland.org>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/4] usb: typec: Factor out non-PD fwnode properties

On Wed, Feb 02, 2022 at 04:19:46PM -0600, Samuel Holland wrote:
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index 5fce795b69c7..8b58aa6e3509 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -5935,32 +5935,10 @@ static int tcpm_fw_get_caps(struct tcpm_port *port,
>  	if (!fwnode)
>  		return -EINVAL;
>  
> -	/*
> -	 * This fwnode has a "compatible" property, but is never populated as a
> -	 * struct device. Instead we simply parse it to read the properties.
> -	 * This it breaks fw_devlink=on. To maintain backward compatibility
> -	 * with existing DT files, we work around this by deleting any
> -	 * fwnode_links to/from this fwnode.
> -	 */
> -	fw_devlink_purge_absent_suppliers(fwnode);
> -
> -	/* USB data support is optional */
> -	ret = fwnode_property_read_string(fwnode, "data-role", &cap_str);
> -	if (ret == 0) {
> -		ret = typec_find_port_data_role(cap_str);
> -		if (ret < 0)
> -			return ret;
> -		port->typec_caps.data = ret;
> -	}
> -
> -	ret = fwnode_property_read_string(fwnode, "power-role", &cap_str);
> +	ret = typec_get_fw_cap(&port->typec_caps, fwnode);
>  	if (ret < 0)
>  		return ret;
>  
> -	ret = typec_find_port_power_role(cap_str);
> -	if (ret < 0)
> -		return ret;
> -	port->typec_caps.type = ret;
>  	port->port_type = port->typec_caps.type;
>  	port->pd_supported = !fwnode_property_read_bool(fwnode, "pd-disable");
>  
> @@ -5997,14 +5975,6 @@ static int tcpm_fw_get_caps(struct tcpm_port *port,
>  	if (port->port_type == TYPEC_PORT_SRC)
>  		return 0;
>  
> -	/* Get the preferred power role for DRP */
> -	ret = fwnode_property_read_string(fwnode, "try-power-role", &cap_str);
> -	if (ret < 0)
> -		return ret;
> -
> -	port->typec_caps.prefer_role = typec_find_power_role(cap_str);
> -	if (port->typec_caps.prefer_role < 0)
> -		return -EINVAL;
>  sink:
>  	port->self_powered = fwnode_property_read_bool(fwnode, "self-powered");

It looks like after this there are no more users for that cap_str
variable. You need to remove that too.

thanks,

-- 
heikki