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

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

    Linux kernel already has of_graph_get_remote_port_parent(),
    but, sometimes we want to get own port parent.
    This patch adds of_graph_get_port_parent()

    Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
    ---
    drivers/of/base.c | 30 ++++++++++++++++++++++--------
    include/linux/of_graph.h | 7 +++++++
    2 files changed, 29 insertions(+), 8 deletions(-)

    diff --git a/drivers/of/base.c b/drivers/of/base.c
    index a39d470..283cfbb 100644
    --- a/drivers/of/base.c
    +++ b/drivers/of/base.c
    @@ -2341,6 +2341,27 @@ struct device_node *of_graph_get_remote_endpoint(const struct device_node *node)
    EXPORT_SYMBOL(of_graph_get_remote_endpoint);

    /**
    + * of_graph_get_port_parent() - get port's parent node
    + * @node: pointer to a local endpoint device_node
    + *
    + * Return: device node associated with endpoint node linked
    + * to @node. Use of_node_put() on it when done.
    + */
    +struct device_node *of_graph_get_port_parent(struct device_node *node)
    +{
    + unsigned int depth;
    +
    + /* Walk 3 levels up only if there is 'ports' node. */
    + for (depth = 3; depth && node; depth--) {
    + node = of_get_next_parent(node);
    + if (depth == 2 && of_node_cmp(node->name, "ports"))
    + break;
    + }
    + return node;
    +}
    +EXPORT_SYMBOL(of_graph_get_port_parent);
    +
    +/**
    * of_graph_get_remote_port_parent() - get remote port's parent node
    * @node: pointer to a local endpoint device_node
    *
    @@ -2351,18 +2372,11 @@ struct device_node *of_graph_get_remote_port_parent(
    const struct device_node *node)
    {
    struct device_node *np;
    - unsigned int depth;

    /* Get remote endpoint node. */
    np = of_graph_get_remote_endpoint(node);

    - /* Walk 3 levels up only if there is 'ports' node. */
    - for (depth = 3; depth && np; depth--) {
    - np = of_get_next_parent(np);
    - if (depth == 2 && of_node_cmp(np->name, "ports"))
    - break;
    - }
    - return np;
    + return of_graph_get_port_parent(np);
    }
    EXPORT_SYMBOL(of_graph_get_remote_port_parent);

    diff --git a/include/linux/of_graph.h b/include/linux/of_graph.h
    index 86baae5..d9868c2 100644
    --- a/include/linux/of_graph.h
    +++ b/include/linux/of_graph.h
    @@ -57,6 +57,7 @@ struct device_node *of_graph_get_endpoint_by_regs(
    const struct device_node *parent, int port_reg, int reg);
    struct device_node *of_graph_get_remote_endpoint(
    const struct device_node *node);
    +struct device_node *of_graph_get_port_parent(struct device_node *node);
    struct device_node *of_graph_get_remote_port_parent(
    const struct device_node *node);
    struct device_node *of_graph_get_remote_port(const struct device_node *node);
    @@ -109,6 +110,12 @@ static inline struct device_node *of_graph_get_remote_endpoint(
    return NULL;
    }

    +static inline struct device_node *of_graph_get_port_parent(
    + struct device_node *node)
    +{
    + return NULL;
    +}
    +
    static inline struct device_node *of_graph_get_remote_port_parent(
    const struct device_node *node)
    {
    --
    1.9.1
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