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

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Date:   Fri, 20 Nov 2020 18:00:37 -0800
From:   Saravana Kannan <saravanak@...gle.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        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 Mon, Nov 16, 2020 at 8:27 AM Rafael J. Wysocki <rafael@...nel.org> wrote:
>
> 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].

Ack.

-Saravana




-Saravana

>
> > ---
> >  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
> >