| Message ID | 1457073455-11516-17-git-send-email-zhaoshenglong@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Fri, 4 Mar 2016, Shannon Zhao wrote: > From: Shannon Zhao <shannon.zhao@linaro.org> > > 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> > 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); > -- > 2.0.4 > >
On Fri, Mar 4, 2016 at 12:37 AM, Shannon Zhao <zhaoshenglong@huawei.com> wrote: > From: Shannon Zhao <shannon.zhao@linaro.org> > > 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: Rob Herring <robh@kernel.org>
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);