regulator: gpio-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 gpio-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 states 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>
(cherry picked from commit 934624d6e9f0b3d41557c4105c286e8daeaadb4e)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

diff --git a/drivers/regulator/gpio-regulator.c b/drivers/regulator/gpio-regulator.c
index 5491cee..9fd5561 100644 (file)
--- a/drivers/regulator/gpio-regulator.c
+++ b/drivers/regulator/gpio-regulator.c
@@ -136,7 +136,6 @@ static struct gpio_regulator_config *
 of_get_gpio_regulator_config(struct device *dev, struct device_node *np)
 {
        struct gpio_regulator_config *config;
-       struct property *prop;
        const char *regtype;
        int proplen, gpio, i;
        int ret;
@@ -191,14 +190,12 @@ of_get_gpio_regulator_config(struct device *dev, struct device_node *np)
        }
 
        /* Fetch states. */
-       prop = of_find_property(np, "states", NULL);
-       if (!prop) {
+       proplen = of_property_count_u32_elems(np, "states");
+       if (proplen < 0) {
                dev_err(dev, "No 'states' property found\n");
                return ERR_PTR(-EINVAL);
        }
 
-       proplen = prop->length / sizeof(int);
-
        config->states = devm_kzalloc(dev,
                                sizeof(struct gpio_regulator_state)
                                * (proplen / 2),
@@ -207,10 +204,10 @@ of_get_gpio_regulator_config(struct device *dev, struct device_node *np)
                return ERR_PTR(-ENOMEM);
 
        for (i = 0; i < proplen / 2; i++) {
-               config->states[i].value =
-                       be32_to_cpup((int *)prop->value + (i * 2));
-               config->states[i].gpios =
-                       be32_to_cpup((int *)prop->value + (i * 2 + 1));
+               of_property_read_u32_index(np, "states", i * 2,
+                                          &config->states[i].value);
+               of_property_read_u32_index(np, "states", i * 2 + 1,
+                                          &config->states[i].gpios);
        }
        config->nr_states = i;