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

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Message-ID: <CAPTae5+qMTg3t4_D8Yp=TihnBmUVvQz-4OrytE8rgJ4=MF4R6g@mail.gmail.com>
Date: Mon, 6 Oct 2025 16:52:42 -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, 
	Hans de Goede <hdegoede@...hat.com>, jun.li@....com
Subject: Re: [PATCH] tcpm: switch check for role_sw device with fw_node

On Mon, Oct 6, 2025 at 4:45 PM Badhri Jagan Sridharan <badhri@...gle.com> wrote:
>
> .
>
> On Fri, Oct 3, 2025 at 3:34 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 witch usb-role-switch
>
> s/witch/with
>
> > property set. Only when those connecter entry is missing, it should
>
> s/connecter/connector
>
> > 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.
> >
>
> Missing Fixes: tag ?

Also please Cc: stable@...r.kernel.org.
ref:https://www.kernel.org/doc/Documentation/process/stable-kernel-rules.rst

>
> > Signed-off-by: Michael Grzeschik <m.grzeschik@...gutronix.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);
>
>
> Seems to be a reasonable thing to do esp. given that bindings
> documention mentions that port/ports node is part of connector
> class:https://github.com/gregkh/linux/blob/master/Documentation/devicetree/bindings/connector/usb-connector.yaml#L189.
>
>
> Adding hdegoede@, jun.li@ as they submitted patches for USB role switch in tcpm.
> hdegoede@, jun.li@ Please let us know if there are any concerns from
> your side regarding accepting this patch.
>
> Thanks,
> Badhri
>
>
> >
> >         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>
> >