linux-kernel - Re: [PATCH v3 2/3] usb: roles: intel_xhci: Supplying software node for the role mux

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Message-ID: <CAHp75Vdfw5zwphnT03uunn686U33MjzeVy+sfAttcFt0WgYwaA@mail.gmail.com>
Date:   Mon, 19 Aug 2019 13:37:25 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Andy Shevchenko <andy@...radead.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Darren Hart <dvhart@...radead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2/3] usb: roles: intel_xhci: Supplying software node
 for the role mux

On Mon, Aug 19, 2019 at 1:07 PM Heikki Krogerus
<heikki.krogerus@...ux.intel.com> wrote:
>
> The primary purpose for this node will be to allow linking
> the users of the switch to it. The users will be for example
> USB Type-C connectors. By supplying a reference to this
> node in the software nodes representing the USB Type-C
> controllers or connectors, the drivers for those devices can
> access the switch.
>

FWIW,
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

> Signed-off-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> ---
>  .../usb/roles/intel-xhci-usb-role-switch.c    | 27 ++++++++++++++-----
>  1 file changed, 20 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/usb/roles/intel-xhci-usb-role-switch.c b/drivers/usb/roles/intel-xhci-usb-role-switch.c
> index 277de96181f9..7325a84dd1c8 100644
> --- a/drivers/usb/roles/intel-xhci-usb-role-switch.c
> +++ b/drivers/usb/roles/intel-xhci-usb-role-switch.c
> @@ -39,6 +39,10 @@ struct intel_xhci_usb_data {
>         void __iomem *base;
>  };
>
> +static const struct software_node intel_xhci_usb_node = {
> +       "intel-xhci-usb-sw",
> +};
> +
>  static int intel_xhci_usb_set_role(struct device *dev, enum usb_role role)
>  {
>         struct intel_xhci_usb_data *data = dev_get_drvdata(dev);
> @@ -122,17 +126,13 @@ static enum usb_role intel_xhci_usb_get_role(struct device *dev)
>         return role;
>  }
>
> -static const struct usb_role_switch_desc sw_desc = {
> -       .set = intel_xhci_usb_set_role,
> -       .get = intel_xhci_usb_get_role,
> -       .allow_userspace_control = true,
> -};
> -
>  static int intel_xhci_usb_probe(struct platform_device *pdev)
>  {
> +       struct usb_role_switch_desc sw_desc = { };
>         struct device *dev = &pdev->dev;
>         struct intel_xhci_usb_data *data;
>         struct resource *res;
> +       int ret;
>
>         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
>         if (!data)
> @@ -147,9 +147,20 @@ static int intel_xhci_usb_probe(struct platform_device *pdev)
>
>         platform_set_drvdata(pdev, data);
>
> +       ret = software_node_register(&intel_xhci_usb_node);
> +       if (ret)
> +               return ret;
> +
> +       sw_desc.set = intel_xhci_usb_set_role,
> +       sw_desc.get = intel_xhci_usb_get_role,
> +       sw_desc.allow_userspace_control = true,
> +       sw_desc.fwnode = software_node_fwnode(&intel_xhci_usb_node);
> +
>         data->role_sw = usb_role_switch_register(dev, &sw_desc);
> -       if (IS_ERR(data->role_sw))
> +       if (IS_ERR(data->role_sw)) {
> +               fwnode_handle_put(sw_desc.fwnode);
>                 return PTR_ERR(data->role_sw);
> +       }
>
>         pm_runtime_set_active(dev);
>         pm_runtime_enable(dev);
> @@ -164,6 +175,8 @@ static int intel_xhci_usb_remove(struct platform_device *pdev)
>         pm_runtime_disable(&pdev->dev);
>
>         usb_role_switch_unregister(data->role_sw);
> +       fwnode_handle_put(software_node_fwnode(&intel_xhci_usb_node));
> +
>         return 0;
>  }
>
> --
> 2.23.0.rc1
>


-- 
With Best Regards,
Andy Shevchenko