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    SubjectRe: [PATCH v4 16/17] FDT: Add a helper to get specified name subnode
    On Fri, 5 Feb 2016, Shannon Zhao wrote:
    > From: Shannon Zhao <shannon.zhao@linaro.org>
    >
    > Sometimes it needs to check if there is a node in FDT by full path.
    > Introduce this helper to get the specified name subnode if it exists.
    >
    > Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>

    Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>


    > CC: Rob Herring <robh@kernel.org>
    > ---
    > drivers/of/fdt.c | 25 +++++++++++++++++++++++++
    > include/linux/of_fdt.h | 2 ++
    > 2 files changed, 27 insertions(+)
    >
    > diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
    > index 655f79d..eacb188 100644
    > --- a/drivers/of/fdt.c
    > +++ b/drivers/of/fdt.c
    > @@ -645,6 +645,31 @@ int __init of_scan_flat_dt(int (*it)(unsigned long node,
    > }
    >
    > /**
    > + * of_get_flat_dt_subnode_by_name - get subnode of specified node by 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)
    > +{
    > + const void *blob = initial_boot_params;
    > + int offset;
    > + const char *pathp;
    > +
    > + for (offset = fdt_first_subnode(blob, node);
    > + offset >= 0;
    > + offset = fdt_next_subnode(blob, offset)) {
    > + pathp = fdt_get_name(blob, offset, NULL);
    > + if (strcmp(pathp, uname) == 0)
    > + return offset;
    > + }
    > +
    > + return -FDT_ERR_NOTFOUND;
    > +}
    > +
    > +/**
    > * 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);
    > --
    > 2.0.4
    >
    >

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