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    Subject[PATCH v2 5/7] of_graph: add of_graph_get_top_port()
    Date

    From: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>

    driver want to get top level of port[s] node. This patch adds
    of_graph_get_top_port() for this purpose

    Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
    ---
    v1 -> v2

    - no change

    drivers/of/base.c | 24 ++++++++++++++++++++++++
    include/linux/of_graph.h | 2 ++
    2 files changed, 26 insertions(+)

    diff --git a/drivers/of/base.c b/drivers/of/base.c
    index a059d59..a085961 100644
    --- a/drivers/of/base.c
    +++ b/drivers/of/base.c
    @@ -2225,6 +2225,30 @@ struct device_node *of_graph_get_port_by_id(struct device_node *parent, u32 id)
    EXPORT_SYMBOL(of_graph_get_port_by_id);

    /**
    + * of_graph_get_top_port() - get the top port node
    + * @dev: pointer to the device
    + *
    + * Return: A 'port' node pointer with refcount incremented. The caller
    + * has to use of_node_put() on it when done.
    + */
    +struct device_node *of_graph_get_top_port(struct device *dev)
    +{
    + struct device_node *np = dev->of_node;
    + struct device_node *node;
    +
    + node = of_get_child_by_name(np, "ports");
    + if (node)
    + return node;
    +
    + node = of_get_child_by_name(np, "port");
    + if (node)
    + return node;
    +
    + return NULL;
    +}
    +EXPORT_SYMBOL(of_graph_get_top_port);
    +
    +/**
    * of_graph_get_next_endpoint() - get next endpoint node
    * @parent: pointer to the parent device node
    * @prev: previous endpoint node, or NULL to get first
    diff --git a/include/linux/of_graph.h b/include/linux/of_graph.h
    index 0f362ed..35e9a6e 100644
    --- a/include/linux/of_graph.h
    +++ b/include/linux/of_graph.h
    @@ -14,6 +14,7 @@
    #ifndef __LINUX_OF_GRAPH_H
    #define __LINUX_OF_GRAPH_H

    +#include <linux/device.h>
    #include <linux/types.h>
    #include <linux/errno.h>

    @@ -47,6 +48,7 @@ int of_graph_parse_endpoint(const struct device_node *node,
    struct of_endpoint *endpoint);
    bool of_graph_port_type_is(struct device_node *port, char *type);
    struct device_node *of_graph_get_port_by_id(struct device_node *node, u32 id);
    +struct device_node *of_graph_get_top_port(struct device *dev);
    struct device_node *of_graph_get_next_endpoint(const struct device_node *parent,
    struct device_node *previous);
    struct device_node *of_graph_get_endpoint_by_regs(
    --
    1.9.1
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