On Fri, 8 Jan 2021, Rahul Singh wrote: > Import the Linux helper of_property_match_string. This function searches > a string list property and returns the index of a specific string value. > > Signed-off-by: Rahul Singh <rahul.si...@arm.com>
Reviewed-by: Stefano Stabellini <sstabell...@kernel.org> > --- > Changes in V3: > - This patch is introduce in this verison. > Changes in V4: Rebase > --- > xen/common/device_tree.c | 27 +++++++++++++++++++++++++++ > xen/include/xen/device_tree.h | 12 ++++++++++++ > 2 files changed, 39 insertions(+) > > diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c > index e107c6f89f..18825e333e 100644 > --- a/xen/common/device_tree.c > +++ b/xen/common/device_tree.c > @@ -208,6 +208,33 @@ int dt_property_read_string(const struct dt_device_node > *np, > return 0; > } > > +int dt_property_match_string(const struct dt_device_node *np, > + const char *propname, const char *string) > +{ > + const struct dt_property *dtprop = dt_find_property(np, propname, NULL); > + size_t l; > + int i; > + const char *p, *end; > + > + if ( !dtprop ) > + return -EINVAL; > + if ( !dtprop->value ) > + return -ENODATA; > + > + p = dtprop->value; > + end = p + dtprop->length; > + > + for ( i = 0; p < end; i++, p += l ) > + { > + l = strnlen(p, end - p) + 1; > + if ( p + l > end ) > + return -EILSEQ; > + if ( strcmp(string, p) == 0 ) > + return i; /* Found it; return index */ > + } > + return -ENODATA; > +} > + > bool_t dt_device_is_compatible(const struct dt_device_node *device, > const char *compat) > { > diff --git a/xen/include/xen/device_tree.h b/xen/include/xen/device_tree.h > index f2ad22b79c..b02696be94 100644 > --- a/xen/include/xen/device_tree.h > +++ b/xen/include/xen/device_tree.h > @@ -400,6 +400,18 @@ static inline bool_t dt_property_read_bool(const struct > dt_device_node *np, > int dt_property_read_string(const struct dt_device_node *np, > const char *propname, const char **out_string); > > +/** > + * dt_property_match_string() - Find string in a list and return index > + * @np: pointer to node containing string list property > + * @propname: string list property name > + * @string: pointer to string to search for in string list > + * > + * This function searches a string list property and returns the index > + * of a specific string value. > + */ > +int dt_property_match_string(const struct dt_device_node *np, > + const char *propname, const char *string); > + > /** > * Checks if the given "compat" string matches one of the strings in > * the device's "compatible" property > -- > 2.17.1 >