linux-kernel - Re: [net-next: PATCH v4 4/7] device property: Allow iterating over available child fwnodes

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Message-ID: <CAJZ5v0gc0qB1ssmAcS9jM47=akeUPhKwzDpzGE=T79meSOsRMQ@mail.gmail.com>
Date:   Tue, 23 Jan 2018 01:05:26 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Marcin Wojtas <mw@...ihalf.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Graeme Gregory <graeme.gregory@...aro.org>,
        David Miller <davem@...emloft.net>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Rafael Wysocki <rafael.j.wysocki@...el.com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Antoine Tenart <antoine.tenart@...e-electrons.com>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        Gregory Clement <gregory.clement@...e-electrons.com>,
        stefanc@...vell.com, Nadav Haklai <nadavh@...vell.com>,
        Neta Zur Hershkovits <neta@...vell.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>, jaz@...ihalf.com,
        Tomasz Nowicki <tn@...ihalf.com>
Subject: Re: [net-next: PATCH v4 4/7] device property: Allow iterating over
 available child fwnodes

On Thu, Jan 18, 2018 at 1:31 PM, Marcin Wojtas <mw@...ihalf.com> wrote:
> Implement a new helper function fwnode_get_next_available_child_node(),
> which enables obtaining next enabled child fwnode, which
> works on a similar basis to OF's of_get_next_available_child().
>
> This commit also introduces a macro, thanks to which it is
> possible to iterate over the available fwnodes, using the
> new function described above.
>
> Signed-off-by: Marcin Wojtas <mw@...ihalf.com>

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

> ---
>  drivers/base/property.c  | 26 ++++++++++++++++++++
>  include/linux/property.h |  6 +++++
>  2 files changed, 32 insertions(+)
>
> diff --git a/drivers/base/property.c b/drivers/base/property.c
> index 1d6c9d9..613ba82 100644
> --- a/drivers/base/property.c
> +++ b/drivers/base/property.c
> @@ -998,6 +998,32 @@ fwnode_get_next_child_node(const struct fwnode_handle *fwnode,
>  EXPORT_SYMBOL_GPL(fwnode_get_next_child_node);
>
>  /**
> + * fwnode_get_next_available_child_node - Return the next
> + * available child node handle for a node
> + * @fwnode: Firmware node to find the next child node for.
> + * @child: Handle to one of the node's child nodes or a %NULL handle.
> + */
> +struct fwnode_handle *
> +fwnode_get_next_available_child_node(const struct fwnode_handle *fwnode,
> +                                    struct fwnode_handle *child)
> +{
> +       struct fwnode_handle *next_child = child;
> +
> +       if (!fwnode)
> +               return NULL;
> +
> +       do {
> +               next_child = fwnode_get_next_child_node(fwnode, next_child);
> +
> +               if (!next_child || fwnode_device_is_available(next_child))
> +                       break;
> +       } while (next_child);
> +
> +       return next_child;
> +}
> +EXPORT_SYMBOL_GPL(fwnode_get_next_available_child_node);
> +
> +/**
>   * device_get_next_child_node - Return the next child node handle for a device
>   * @dev: Device to find the next child node for.
>   * @child: Handle to one of the device's child nodes or a null handle.
> diff --git a/include/linux/property.h b/include/linux/property.h
> index e05889f..5b0563a 100644
> --- a/include/linux/property.h
> +++ b/include/linux/property.h
> @@ -83,11 +83,17 @@ struct fwnode_handle *fwnode_get_next_parent(
>         struct fwnode_handle *fwnode);
>  struct fwnode_handle *fwnode_get_next_child_node(
>         const struct fwnode_handle *fwnode, struct fwnode_handle *child);
> +struct fwnode_handle *fwnode_get_next_available_child_node(
> +       const struct fwnode_handle *fwnode, struct fwnode_handle *child);
>
>  #define fwnode_for_each_child_node(fwnode, child)                      \
>         for (child = fwnode_get_next_child_node(fwnode, NULL); child;   \
>              child = fwnode_get_next_child_node(fwnode, child))
>
> +#define fwnode_for_each_available_child_node(fwnode, child)                   \
> +       for (child = fwnode_get_next_available_child_node(fwnode, NULL); child;\
> +            child = fwnode_get_next_available_child_node(fwnode, child))
> +
>  struct fwnode_handle *device_get_next_child_node(
>         struct device *dev, struct fwnode_handle *child);
>
> --