regulator: ti-abb-regulator: do not open-code counting and access of dt array elements

Open coding the counting of elements in a dt-property is abstracted by the newly
introduced of_property_count_uXX_elems functions. Additionally the raw iteration
over the states element exposes the endian conversion and dtb-format details,
which according to Mark Rutland "would be nice to limit [...] to of_ helper
functions".

Thus change ti-abb-regulator to use the helper for element counting and
of_property_read_u32_index for retrieval of individual values.

This makes it possible to remove the raw access to the property entirely.

Signed-off-by: Heiko Stuebner <heiko.stuebner@bqreaders.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 20 insertions, 23 deletions

diff --git a/drivers/regulator/ti-abb-regulator.c b/drivers/regulator/ti-abb-regulator.c
index a97d0c5e1097..804c83a31d69 100644
--- a/drivers/regulator/ti-abb-regulator.c
+++ b/drivers/regulator/ti-abb-regulator.c
@@ -507,32 +507,24 @@ static int ti_abb_init_table(struct device *dev, struct ti_abb *abb,
                              struct regulator_init_data *rinit_data)
 {
         struct ti_abb_info *info;
-        const struct property *prop;
-        const __be32 *abb_info;
         const u32 num_values = 6;
         char *pname = "ti,abb_info";
-        u32 num_entries, i;
+        u32 i;
         unsigned int *volt_table;
-        int min_uV = INT_MAX, max_uV = 0;
+        int num_entries, min_uV = INT_MAX, max_uV = 0;
         struct regulation_constraints *c = &rinit_data->constraints;
 
-        prop = of_find_property(dev->of_node, pname, NULL);
-        if (!prop) {
-                dev_err(dev, "No '%s' property?\n", pname);
-                return -ENODEV;
-        }
-
-        if (!prop->value) {
-                dev_err(dev, "Empty '%s' property?\n", pname);
-                return -ENODATA;
-        }
-
         /*
          * Each abb_info is a set of n-tuple, where n is num_values, consisting
          * of voltage and a set of detection logic for ABB information for that
          * voltage to apply.
          */
-        num_entries = prop->length / sizeof(u32);
+        num_entries = of_property_count_u32_elems(dev->of_node, pname);
+        if (num_entries < 0) {
+                dev_err(dev, "No '%s' property?\n", pname);
+                return -ENODEV;
+        }
+
         if (!num_entries || (num_entries % num_values)) {
                 dev_err(dev, "All '%s' list entries need %d vals\n", pname,
                         num_values);
@@ -561,18 +553,23 @@ static int ti_abb_init_table(struct device *dev, struct ti_abb *abb,
         /* We do not know where the OPP voltage is at the moment */
         abb->current_info_idx = -EINVAL;
 
-        abb_info = prop->value;
         for (i = 0; i < num_entries; i++, info++, volt_table++) {
                 u32 efuse_offset, rbb_mask, fbb_mask, vset_mask;
                 u32 efuse_val;
 
                 /* NOTE: num_values should equal to entries picked up here */
-                *volt_table = be32_to_cpup(abb_info++);
-                info->opp_sel = be32_to_cpup(abb_info++);
-                efuse_offset = be32_to_cpup(abb_info++);
-                rbb_mask = be32_to_cpup(abb_info++);
-                fbb_mask = be32_to_cpup(abb_info++);
-                vset_mask = be32_to_cpup(abb_info++);
+                of_property_read_u32_index(dev->of_node, pname, i * num_values,
+                                           volt_table);
+                of_property_read_u32_index(dev->of_node, pname,
+                                           i * num_values + 1, &info->opp_sel);
+                of_property_read_u32_index(dev->of_node, pname,
+                                           i * num_values + 2, &efuse_offset);
+                of_property_read_u32_index(dev->of_node, pname,
+                                           i * num_values + 3, &rbb_mask);
+                of_property_read_u32_index(dev->of_node, pname,
+                                           i * num_values + 4, &fbb_mask);
+                of_property_read_u32_index(dev->of_node, pname,
+                                           i * num_values + 5, &vset_mask);
 
                 dev_dbg(dev,
                         "[%d]v=%d ABB=%d ef=0x%x rbb=0x%x fbb=0x%x vset=0x%x\n",