From a436ef4aba1f011fa25f35fe7922d577ecde6c7c Mon Sep 17 00:00:00 2001 From: Saravana Kannan Date: Mon, 4 Nov 2019 22:49:59 -0800 Subject: of: property: Make it easy to add device links from DT properties Add a DEFINE_SIMPLE_PROP macro to make it easy to add support for simple properties with fixed names that just list phandles and phandle args. Add a DEFINE_SUFFIX_PROP macro to make it easy to add support for properties with fixes suffix that just list phandles and phandle args. Signed-off-by: Saravana Kannan Reviewed-by: Rob Herring Link: https://lore.kernel.org/r/20191105065000.50407-3-saravanak@google.com Signed-off-by: Greg Kroah-Hartman --- drivers/of/property.c | 62 ++++++++++++++++++++++++++++++++++++++------------- 1 file changed, 47 insertions(+), 15 deletions(-) (limited to 'drivers/of') diff --git a/drivers/of/property.c b/drivers/of/property.c index fbc201330ba0..812b69a029d1 100644 --- a/drivers/of/property.c +++ b/drivers/of/property.c @@ -1101,17 +1101,11 @@ static struct device_node *parse_prop_cells(struct device_node *np, return sup_args.np; } -static struct device_node *parse_clocks(struct device_node *np, - const char *prop_name, int index) -{ - return parse_prop_cells(np, prop_name, index, "clocks", "#clock-cells"); -} - -static struct device_node *parse_interconnects(struct device_node *np, - const char *prop_name, int index) -{ - return parse_prop_cells(np, prop_name, index, "interconnects", - "#interconnect-cells"); +#define DEFINE_SIMPLE_PROP(fname, name, cells) \ +static struct device_node *parse_##fname(struct device_node *np, \ + const char *prop_name, int index) \ +{ \ + return parse_prop_cells(np, prop_name, index, name, cells); \ } static int strcmp_suffix(const char *str, const char *suffix) @@ -1125,13 +1119,47 @@ static int strcmp_suffix(const char *str, const char *suffix) return strcmp(str + len - suffix_len, suffix); } -static struct device_node *parse_regulators(struct device_node *np, - const char *prop_name, int index) +/** + * parse_suffix_prop_cells - Suffix property parsing function for suppliers + * + * @np: Pointer to device tree node containing a list + * @prop_name: Name of property to be parsed. Expected to hold phandle values + * @index: For properties holding a list of phandles, this is the index + * into the list. + * @suffix: Property suffix that is known to contain list of phandle(s) to + * supplier(s) + * @cells_name: property name that specifies phandles' arguments count + * + * This is a helper function to parse properties that have a known fixed suffix + * and are a list of phandles and phandle arguments. + * + * Returns: + * - phandle node pointer with refcount incremented. Caller must of_node_put() + * on it when done. + * - NULL if no phandle found at index + */ +static struct device_node *parse_suffix_prop_cells(struct device_node *np, + const char *prop_name, int index, + const char *suffix, + const char *cells_name) { - if (index || strcmp_suffix(prop_name, "-supply")) + struct of_phandle_args sup_args; + + if (strcmp_suffix(prop_name, suffix)) return NULL; - return of_parse_phandle(np, prop_name, 0); + if (of_parse_phandle_with_args(np, prop_name, cells_name, index, + &sup_args)) + return NULL; + + return sup_args.np; +} + +#define DEFINE_SUFFIX_PROP(fname, suffix, cells) \ +static struct device_node *parse_##fname(struct device_node *np, \ + const char *prop_name, int index) \ +{ \ + return parse_suffix_prop_cells(np, prop_name, index, suffix, cells); \ } /** @@ -1155,6 +1183,10 @@ struct supplier_bindings { const char *prop_name, int index); }; +DEFINE_SIMPLE_PROP(clocks, "clocks", "#clock-cells") +DEFINE_SIMPLE_PROP(interconnects, "interconnects", "#interconnect-cells") +DEFINE_SUFFIX_PROP(regulators, "-supply", NULL) + static const struct supplier_bindings of_supplier_bindings[] = { { .parse_prop = parse_clocks, }, { .parse_prop = parse_interconnects, }, -- cgit v1.2.3-59-g8ed1b