name for integer state ID 0, list entry 1 for state ID 1, and
so on.
+pinctrl-assert-gpios:
+ List of phandles, each pointing at a GPIO which is used by some
+ board design to steer pins between two peripherals on the board.
+ It plays like a board level pin multiplexer to choose different
+ functions for given pins by pulling up/down the GPIOs. See
+ bindings/gpio/gpio.txt for details of how to specify GPIO.
+
For example:
/* For a client device requiring named states */
#include <linux/device.h>
#include <linux/of.h>
+#include <linux/of_gpio.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/slab.h>
return dt_remember_or_free_map(p, statename, NULL, map, 1);
}
+static int dt_gpio_assert_pinctrl(struct pinctrl *p)
+{
+ struct device_node *np = p->dev->of_node;
+ enum of_gpio_flags flags;
+ int gpio;
+ int index = 0;
+ int ret;
+
+ if (!of_find_property(np, "pinctrl-assert-gpios", NULL))
+ return 0; /* Missing the property, so nothing to be done */
+
+ for (;; index++) {
+ gpio = of_get_named_gpio_flags(np, "pinctrl-assert-gpios",
+ index, &flags);
+ if (gpio < 0)
+ break; /* End of the phandle list */
+
+ if (!gpio_is_valid(gpio))
+ return -EINVAL;
+
+ ret = devm_gpio_request_one(p->dev, gpio, GPIOF_OUT_INIT_LOW,
+ NULL);
+ if (ret < 0)
+ return ret;
+
+ if (flags & OF_GPIO_ACTIVE_LOW)
+ continue;
+
+ if (gpio_cansleep(gpio))
+ gpio_set_value_cansleep(gpio, 1);
+ else
+ gpio_set_value(gpio, 1);
+ }
+
+ return 0;
+}
+
int pinctrl_dt_to_map(struct pinctrl *p)
{
struct device_node *np = p->dev->of_node;
return 0;
}
+ ret = dt_gpio_assert_pinctrl(p);
+ if (ret) {
+ dev_dbg(p->dev, "failed to assert pinctrl setting: %d\n", ret);
+ return ret;
+ }
+
/* We may store pointers to property names within the node */
of_node_get(np);