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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 <saravanak@google.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20191105065000.50407-3-saravanak@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Saravana Kannan 2019-11-04 22:49:59 -08:00 committed by Greg Kroah-Hartman
parent ba861f8e07
commit a436ef4aba
1 changed files with 47 additions and 15 deletions
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62
drivers/of/property.c
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@ -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, },