linux-kernel - Re: [RFC PATCH 3/5] usb: roles: Find the muxes by also matching against the device node

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Message-ID: <CAKgpwJVaOrZaPOZrfeDiym=P=uZSbG1Aw5T0xayuPMFxG-3cyQ@mail.gmail.com>
Date:   Tue, 22 Jan 2019 13:40:02 +0800
From:   Jun Li <lijun.kernel@...il.com>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc:     Heiko Stuebner <heiko@...ech.de>,
        Guenter Roeck <linux@...ck-us.net>,
        Hans de Goede <hdegoede@...hat.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 3/5] usb: roles: Find the muxes by also matching
 against the device node

Hi Heikki,
Heikki Krogerus <heikki.krogerus@...ux.intel.com> 于2018年10月24日周三 下午11:06写道：
>
> When the connections are defined in firmware, struct
> device_connection will have the fwnode member pointing to
> the device node (struct fwnode_handle) of the requested
> device, and the endpoint will not be used at all in that
> case.
>
> Signed-off-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> ---
>  drivers/usb/common/roles.c | 16 +++++++++++++---
>  1 file changed, 13 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/usb/common/roles.c b/drivers/usb/common/roles.c
> index 99116af07f1d..bb52e006d203 100644
> --- a/drivers/usb/common/roles.c
> +++ b/drivers/usb/common/roles.c
> @@ -8,6 +8,7 @@
>   */
>
>  #include <linux/usb/role.h>
> +#include <linux/property.h>
>  #include <linux/device.h>
>  #include <linux/module.h>
>  #include <linux/mutex.h>
> @@ -84,7 +85,12 @@ enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw)
>  }
>  EXPORT_SYMBOL_GPL(usb_role_switch_get_role);
>
> -static int __switch_match(struct device *dev, const void *name)
> +static int switch_fwnode_match(struct device *dev, const void *fwnode)
> +{
> +       return dev_fwnode(dev) == fwnode;

Seems this should be dev_fwnode(dev->parent) == fwnode;
The role switch is the child dev of the caller of usb_role_switch_register().

Li Jun

> +}
> +
> +static int switch_name_match(struct device *dev, const void *name)
>  {
>         return !strcmp((const char *)name, dev_name(dev));
>  }
> @@ -94,8 +100,12 @@ static void *usb_role_switch_match(struct device_connection *con, int ep,
>  {
>         struct device *dev;
>
> -       dev = class_find_device(role_class, NULL, con->endpoint[ep],
> -                               __switch_match);
> +       if (con->fwnode)
> +               dev = class_find_device(role_class, NULL, con->fwnode,
> +                                       switch_fwnode_match);
> +       else
> +               dev = class_find_device(role_class, NULL, con->endpoint[ep],
> +                                       switch_name_match);
>
>         return dev ? to_role_switch(dev) : ERR_PTR(-EPROBE_DEFER);
>  }
> --
> 2.19.1
>