linux-kernel - Re: [PATCH v1] drivers property: When no children in primary, try secondary

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Message-ID: <CAJZ5v0heg9w=k1yqkECNo9XLP2hZny_WJQv4EJq_Wh0dVT137g@mail.gmail.com>
Date:   Wed, 20 May 2020 12:34:06 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Subject: Re: [PATCH v1] drivers property: When no children in primary, try secondary

On Wed, May 20, 2020 at 12:30 PM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
>
> Software firmware nodes can provide a child node to its parent.
> Since software node can be secondary, we need a mechanism to access
> the children. The idea is to list children of the primary node first
> and when they are finished, continue with secondary node if available.

Makes sense.

> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

Greg, do you want me to apply it?

If you'd rather take it yourself, please feel free to add

Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

> ---
>  drivers/base/property.c | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/base/property.c b/drivers/base/property.c
> index 5f35c0ccf5e0..1e6d75e65938 100644
> --- a/drivers/base/property.c
> +++ b/drivers/base/property.c
> @@ -708,14 +708,23 @@ struct fwnode_handle *device_get_next_child_node(struct device *dev,
>                                                  struct fwnode_handle *child)
>  {
>         struct acpi_device *adev = ACPI_COMPANION(dev);
> -       struct fwnode_handle *fwnode = NULL;
> +       struct fwnode_handle *fwnode = NULL, *next;
>
>         if (dev->of_node)
>                 fwnode = &dev->of_node->fwnode;
>         else if (adev)
>                 fwnode = acpi_fwnode_handle(adev);
>
> -       return fwnode_get_next_child_node(fwnode, child);
> +       /* Try to find a child in primary fwnode */
> +       next = fwnode_get_next_child_node(fwnode, child);
> +       if (next)
> +               return next;
> +
> +       /* When no more children in primary, continue with secondary */
> +       if (!IS_ERR_OR_NULL(fwnode->secondary))
> +               next = fwnode_get_next_child_node(fwnode->secondary, child);
> +
> +       return next;
>  }
>  EXPORT_SYMBOL_GPL(device_get_next_child_node);
>
> --
> 2.26.2
>