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