Add support for configuring the machine constraints
valid_modes_mask element based on a list of allowed modes
specified via a device tree property.
Signed-off-by: David Collins <collinsd@xxxxxxxxxxxxxx>
---
drivers/regulator/of_regulator.c | 29 ++++++++++++++++++++++++++++-
1 file changed, 28 insertions(+), 1 deletion(-)
diff --git a/drivers/regulator/of_regulator.c b/drivers/regulator/of_regulator.c
index 0d3f73e..d61fed2 100644
--- a/drivers/regulator/of_regulator.c
+++ b/drivers/regulator/of_regulator.c
@@ -32,7 +32,7 @@ static void of_get_regulation_constraints(struct device_node *np,
struct regulator_state *suspend_state;
struct device_node *suspend_np;
unsigned int mode;
- int ret, i;
+ int ret, i, len;
u32 pval;
constraints->name = of_get_property(np, "regulator-name", NULL);
@@ -136,6 +136,33 @@ static void of_get_regulation_constraints(struct device_node *np,
}
}
+ len = of_property_count_elems_of_size(np, "regulator-allowed-modes",
+ sizeof(u32));
+ if (len > 0) {
+ if (desc && desc->of_map_mode) {
+ for (i = 0; i < len; i++) {
+ ret = of_property_read_u32_index(np,
+ "regulator-allowed-modes", i, &pval);
+ if (ret) {
+ pr_err("%s: couldn't read allowed modes index %d, ret=%d\n",
+ np->name, i, ret);
+ break;
+ }
+ mode = desc->of_map_mode(pval);
+ if (mode == REGULATOR_MODE_INVALID)
+ pr_err("%s: invalid regulator-allowed-modes element %u\n",
+ np->name, pval);
+ else
+ constraints->valid_modes_mask |= mode;
+ }
+ if (constraints->valid_modes_mask)
+ constraints->valid_ops_mask
+ |= REGULATOR_CHANGE_MODE;
+ } else {
+ pr_warn("%s: mode mapping not defined\n", np->name);
+ }
+ }
+
if (!of_property_read_u32(np, "regulator-system-load", &pval))
constraints->system_load = pval;
--
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