#define _ASM_GENERIC_GPIO_H_
#include <dm/ofnode.h>
+#include <linux/bitops.h>
struct ofnode_phandle_args;
struct gpio_desc {
struct udevice *dev; /* Device, NULL for invalid GPIO */
unsigned long flags;
-#define GPIOD_REQUESTED (1 << 0) /* Requested/claimed */
-#define GPIOD_IS_OUT (1 << 1) /* GPIO is an output */
-#define GPIOD_IS_IN (1 << 2) /* GPIO is an input */
-#define GPIOD_ACTIVE_LOW (1 << 3) /* value has active low */
-#define GPIOD_IS_OUT_ACTIVE (1 << 4) /* set output active */
+#define GPIOD_IS_OUT BIT(1) /* GPIO is an output */
+#define GPIOD_IS_IN BIT(2) /* GPIO is an input */
+#define GPIOD_ACTIVE_LOW BIT(3) /* GPIO is active when value is low */
+#define GPIOD_IS_OUT_ACTIVE BIT(4) /* set output active */
+#define GPIOD_OPEN_DRAIN BIT(5) /* GPIO is open drain type */
+#define GPIOD_OPEN_SOURCE BIT(6) /* GPIO is open source type */
+#define GPIOD_PULL_UP BIT(7) /* GPIO has pull-up enabled */
+#define GPIOD_PULL_DOWN BIT(8) /* GPIO has pull-down enabled */
uint offset; /* GPIO offset within the device */
/*
*/
};
+/* helper to compute the value of the gpio output */
+#define GPIOD_FLAGS_OUTPUT_MASK (GPIOD_ACTIVE_LOW | GPIOD_IS_OUT_ACTIVE)
+#define GPIOD_FLAGS_OUTPUT(flags) \
+ (((((flags) & GPIOD_FLAGS_OUTPUT_MASK) == GPIOD_IS_OUT_ACTIVE) || \
+ (((flags) & GPIOD_FLAGS_OUTPUT_MASK) == GPIOD_ACTIVE_LOW)))
+
/**
* dm_gpio_is_valid() - Check if a GPIO is valid
*
*/
struct dm_gpio_ops {
int (*request)(struct udevice *dev, unsigned offset, const char *label);
- int (*free)(struct udevice *dev, unsigned offset);
+ int (*rfree)(struct udevice *dev, unsigned int offset);
int (*direction_input)(struct udevice *dev, unsigned offset);
int (*direction_output)(struct udevice *dev, unsigned offset,
int value);
int (*get_value)(struct udevice *dev, unsigned offset);
int (*set_value)(struct udevice *dev, unsigned offset, int value);
- int (*get_open_drain)(struct udevice *dev, unsigned offset);
- int (*set_open_drain)(struct udevice *dev, unsigned offset, int value);
/**
* get_function() Get the GPIO function
*
*/
int (*xlate)(struct udevice *dev, struct gpio_desc *desc,
struct ofnode_phandle_args *args);
+
+ /**
+ * set_dir_flags() - Set GPIO dir flags
+ *
+ * This function should set up the GPIO configuration according to the
+ * information provide by the direction flags bitfield.
+ *
+ * This method is optional.
+ *
+ * @dev: GPIO device
+ * @offset: GPIO offset within that device
+ * @flags: GPIO configuration to use
+ * @return 0 if OK, -ve on error
+ */
+ int (*set_dir_flags)(struct udevice *dev, unsigned int offset,
+ ulong flags);
+
+ /**
+ * get_dir_flags() - Get GPIO dir flags
+ *
+ * This function return the GPIO direction flags used.
+ *
+ * This method is optional.
+ *
+ * @dev: GPIO device
+ * @offset: GPIO offset within that device
+ * @flags: place to put the used direction flags by GPIO
+ * @return 0 if OK, -ve on error
+ */
+ int (*get_dir_flags)(struct udevice *dev, unsigned int offset,
+ ulong *flags);
};
/**
int dm_gpio_set_value(const struct gpio_desc *desc, int value);
/**
- * dm_gpio_get_open_drain() - Check if open-drain-mode of a GPIO is active
- *
- * This checks if open-drain-mode for a GPIO is enabled or not. This method is
- * optional.
- *
- * @desc: GPIO description containing device, offset and flags,
- * previously returned by gpio_request_by_name()
- * @return Value of open drain mode for GPIO (0 for inactive, 1 for active) or
- * -ve on error
- */
-int dm_gpio_get_open_drain(struct gpio_desc *desc);
-
-/**
- * dm_gpio_set_open_drain() - Switch open-drain-mode of a GPIO on or off
- *
- * This enables or disables open-drain mode for a GPIO. This method is
- * optional; if the driver does not support it, nothing happens when the method
- * is called.
+ * dm_gpio_set_dir() - Set the direction for a GPIO
*
- * In open-drain mode, instead of actively driving the output (Push-pull
- * output), the GPIO's pin is connected to the collector (for a NPN transistor)
- * or the drain (for a MOSFET) of a transistor, respectively. The pin then
- * either forms an open circuit or a connection to ground, depending on the
- * state of the transistor.
+ * This sets up the direction according to the GPIO flags: desc->flags.
*
* @desc: GPIO description containing device, offset and flags,
* previously returned by gpio_request_by_name()
* @return 0 if OK, -ve on error
*/
-int dm_gpio_set_open_drain(struct gpio_desc *desc, int value);
+int dm_gpio_set_dir(struct gpio_desc *desc);
/**
- * dm_gpio_set_dir() - Set the direction for a GPIO
+ * dm_gpio_set_dir_flags() - Set direction using description and added flags
*
- * This sets up the direction according tot the provided flags. It will do
- * nothing unless the direction is actually specified.
+ * This sets up the direction according to the provided flags and the GPIO
+ * description (desc->flags) which include direction information.
+ * Note that desc->flags is updated by this function.
*
* @desc: GPIO description containing device, offset and flags,
* previously returned by gpio_request_by_name()
- * @return 0 if OK, -ve on error
+ * @flags: New flags to use
+ * @return 0 if OK, -ve on error, in which case desc->flags is not updated
*/
-int dm_gpio_set_dir(struct gpio_desc *desc);
+int dm_gpio_set_dir_flags(struct gpio_desc *desc, ulong flags);
/**
- * dm_gpio_set_dir_flags() - Set direction using specific flags
+ * dm_gpio_get_dir_flags() - Get direction flags
*
- * This is like dm_gpio_set_dir() except that the flags value is provided
- * instead of being used from desc->flags. This is needed because in many
- * cases the GPIO description does not include direction information.
- * Note that desc->flags is updated by this function.
+ * read the current direction flags
*
* @desc: GPIO description containing device, offset and flags,
* previously returned by gpio_request_by_name()
- * @flags: New flags to use
+ * @flags: place to put the used flags
* @return 0 if OK, -ve on error, in which case desc->flags is not updated
*/
-int dm_gpio_set_dir_flags(struct gpio_desc *desc, ulong flags);
+int dm_gpio_get_dir_flags(struct gpio_desc *desc, ulong *flags);
/**
* gpio_get_number() - Get the global GPIO number of a GPIO
projects / oweals / u-boot.git / blobdiff