currently crawling through the gpio code in u-boot so, question one,
i see in include/asm-generic/gpio.h, the explicitly listed as
"deprecated" old API routines:
int gpio_request(unsigned gpio, const char *label)
int gpio_free(unsigned gpio)
int gpio_direction_input(unsigned gpio)
int gpio_direction_output(unsigned gpio, int value)
int gpio_get_value(unsigned gpio)
int gpio_set_value(unsigned gpio, int value)
is that it? are those the entirety of the old-style gpio API that are
now deprecated? as in, all else in that header file is relevant for
the newer driver model?
also, i note in that same file enum and flags for the states of a
gpio:
/* State of a GPIO, as reported by get_function() */
enum gpio_func_t {
GPIOF_INPUT = 0,
GPIOF_OUTPUT,
GPIOF_UNUSED, /* Not claimed */
GPIOF_UNKNOWN, /* Not known */
GPIOF_FUNC, /* Not used as a GPIO */
GPIOF_COUNT,
};
struct udevice;
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 */
uint offset; /* GPIO offset within the device */
/*
* We could consider adding the GPIO label in here. Possibly we could
* use this structure for internal GPIO information.
*/
};
however, i note this in drivers/gpio/sandbox.c:
/* Flags for each GPIO */
#define GPIOF_OUTPUT (1 << 0) /* Currently set as an output */
#define GPIOF_HIGH (1 << 1) /* Currently set high */
#define GPIOF_ODR (1 << 2) /* Currently set to open drain mode */
this looks like sandbox is (re)defining some GPIO-related flags ... is
there some reason it doesn't just use the flag definitions from the
earlier header file? or is that a silly question?
rday
--
========================================================================
Robert P. J. Day Ottawa, Ontario, CANADA
http://crashcourse.ca
Twitter: http://twitter.com/rpjday
LinkedIn: http://ca.linkedin.com/in/rpjday
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