linux-kernel - Re: [PATCH v2] tcpm: switch check for role_sw device with fw

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Message-ID: <CAPTae5+sq5uFGpOoHziFoBKbhyzeJ_r6QmJA98wuQhFaTXKmug@mail.gmail.com>
Date: Mon, 13 Oct 2025 10:24:57 -0700
From: Badhri Jagan Sridharan <badhri@...gle.com>
To: Michael Grzeschik <m.grzeschik@...gutronix.de>
Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, kernel@...gutronix.de, 
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org, 
	stable@...r.kernel.org
Subject: Re: [PATCH v2] tcpm: switch check for role_sw device with fw_node

On Mon, Oct 13, 2025 at 2:43 AM Michael Grzeschik
<m.grzeschik@...gutronix.de> wrote:
>
> When there is no port entry in the tcpci entry itself, the driver will
> trigger an error message "OF: graph: no port node found in /...../typec" .
>
> It is documented that the dts node should contain an connector entry
> with ports and several port pointing to devices with usb-role-switch
> property set. Only when those connector entry is missing, it should
> check for port entries in the main node.
>
> We switch the search order for looking after ports, which will avoid the
> failure message while there are explicit connector entries.
>
> Fixes: d56de8c9a17d ("usb: typec: tcpm: try to get role switch from tcpc fwnode")
> Cc: stable@...r.kernel.org
> Signed-off-by: Michael Grzeschik <m.grzeschik@...gutronix.de>

Reviewed-by: Badhri Jagan Sridharan <badhri@...gle.com>

> ---
> Changes in v2:
> - fixed typos in the description
> - added fixes tag
> - added Cc: stable@...r.kernel.org
> - Link to v1: https://lore.kernel.org/r/20251003-b4-ml-topic-tcpm-v1-1-3cdd05588acb@pengutronix.de
> ---
>  drivers/usb/typec/tcpm/tcpm.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index b2a568a5bc9b0ba5c50b7031d8e21ee09cefa349..cc78770509dbc6460d75816f544173d6ab4ef873 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -7876,9 +7876,9 @@ struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc)
>
>         port->partner_desc.identity = &port->partner_ident;
>
> -       port->role_sw = usb_role_switch_get(port->dev);
> +       port->role_sw = fwnode_usb_role_switch_get(tcpc->fwnode);
>         if (!port->role_sw)
> -               port->role_sw = fwnode_usb_role_switch_get(tcpc->fwnode);
> +               port->role_sw = usb_role_switch_get(port->dev);
>         if (IS_ERR(port->role_sw)) {
>                 err = PTR_ERR(port->role_sw);
>                 goto out_destroy_wq;
>
> ---
> base-commit: e406d57be7bd2a4e73ea512c1ae36a40a44e499e
> change-id: 20251003-b4-ml-topic-tcpm-27146727d76a
>
> Best regards,
> --
> Michael Grzeschik <m.grzeschik@...gutronix.de>
>