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    Subject[PATCH v7 16/17] FDT: Add a helper to get the subnode by given name
    Date
    Sometimes it needs to check if there is a subnode of given node in FDT
    by given name. Introduce this helper to get the subnode if it exists.

    CC: Rob Herring <robh@kernel.org>
    Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
    Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
    Acked-by: Rob Herring <robh@kernel.org>
    ---
    drivers/of/fdt.c | 13 +++++++++++++
    include/linux/of_fdt.h | 2 ++
    2 files changed, 15 insertions(+)

    diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
    index 655f79d..09001db 100644
    --- a/drivers/of/fdt.c
    +++ b/drivers/of/fdt.c
    @@ -645,6 +645,19 @@ int __init of_scan_flat_dt(int (*it)(unsigned long node,
    }

    /**
    + * of_get_flat_dt_subnode_by_name - get the subnode by given name
    + *
    + * @node: the parent node
    + * @uname: the name of subnode
    + * @return offset of the subnode, or -FDT_ERR_NOTFOUND if there is none
    + */
    +
    +int of_get_flat_dt_subnode_by_name(unsigned long node, const char *uname)
    +{
    + return fdt_subnode_offset(initial_boot_params, node, uname);
    +}
    +
    +/**
    * of_get_flat_dt_root - find the root node in the flat blob
    */
    unsigned long __init of_get_flat_dt_root(void)
    diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h
    index df9ef38..fc28162 100644
    --- a/include/linux/of_fdt.h
    +++ b/include/linux/of_fdt.h
    @@ -52,6 +52,8 @@ extern char __dtb_end[];
    extern int of_scan_flat_dt(int (*it)(unsigned long node, const char *uname,
    int depth, void *data),
    void *data);
    +extern int of_get_flat_dt_subnode_by_name(unsigned long node,
    + const char *uname);
    extern const void *of_get_flat_dt_prop(unsigned long node, const char *name,
    int *size);
    extern int of_flat_dt_is_compatible(unsigned long node, const char *name);
    --
    2.1.4
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