linux-kernel - Re: [PATCH v1 13/18] driver core: Add fwnode_get_next_parent

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Date:   Mon, 16 Nov 2020 17:27:08 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Saravana Kannan <saravanak@...gle.com>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Marc Zyngier <maz@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Grygorii Strashko <grygorii.strashko@...com>,
        "Cc: Android Kernel" <kernel-team@...roid.com>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-efi <linux-efi@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v1 13/18] driver core: Add fwnode_get_next_parent_dev()
 helper function

On Thu, Nov 5, 2020 at 12:24 AM Saravana Kannan <saravanak@...gle.com> wrote:
>
> Given a fwnode, this function finds the closest ancestor fwnode that has
> a corresponding struct device. The function returns this struct device.
> This function will be used in a subsequent patch in this series.
>
> Signed-off-by: Saravana Kannan <saravanak@...gle.com>

I would combine this one with patch [10/18].

> ---
>  drivers/base/core.c | 25 +++++++++++++++++++++++++
>  1 file changed, 25 insertions(+)
>
> diff --git a/drivers/base/core.c b/drivers/base/core.c
> index ee28d8c7ee85..4ae5f2885ac5 100644
> --- a/drivers/base/core.c
> +++ b/drivers/base/core.c
> @@ -1562,6 +1562,31 @@ static void fw_devlink_parse_fwtree(struct fwnode_handle *fwnode)
>                 fw_devlink_parse_fwtree(child);
>  }
>
> +/**
> + * fwnode_get_next_parent_dev - Find device of closest ancestor fwnode
> + * @fwnode: firmware node
> + *
> + * Given a firmware node (@fwnode), this function finds its closest ancestor
> + * firmware node that has a corresponding struct device and returns that struct
> + * device.
> + *
> + * The caller of this function is expected to call put_device() on the returned
> + * device when they are done.
> + */
> +static struct device *fwnode_get_next_parent_dev(struct fwnode_handle *fwnode)
> +{
> +       struct device *dev = NULL;
> +
> +       fwnode_handle_get(fwnode);
> +       do {
> +               fwnode = fwnode_get_next_parent(fwnode);
> +               if (fwnode)
> +                       dev = get_dev_from_fwnode(fwnode);
> +       } while (fwnode && !dev);
> +       fwnode_handle_put(fwnode);
> +       return dev;
> +}
> +
>  static void fw_devlink_link_device(struct device *dev)
>  {
>         int fw_ret;
> --
> 2.29.1.341.ge80a0c044ae-goog
>