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i2c: Export i2c_deblock_gpio_loop()

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Export the i2c_deblock_gpio_loop() so it can be used in other places in
U-Boot. In particular, this is useful in the GPIO I2C driver, which claims
the SDA/SCL GPIOs and thus prevents the i2c_deblock() implementation from
claiming the pins as GPIOs again.

Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Heiko Schocher <hs@denx.de>
This commit is contained in:
Marek Vasut 2020-02-07 16:57:50 +01:00 committed by Heiko Schocher
parent 1f746a2c82
commit 7231522a5e
2 changed files with 20 additions and 4 deletions
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8
drivers/i2c/i2c-uclass.c
View File

@ -501,10 +501,10 @@ static int i2c_gpio_get_pin(struct gpio_desc *pin)
return dm_gpio_get_value(pin);
}
static int i2c_deblock_gpio_loop(struct gpio_desc *sda_pin,
struct gpio_desc *scl_pin,
unsigned int scl_count,
unsigned int delay)
int i2c_deblock_gpio_loop(struct gpio_desc *sda_pin,
struct gpio_desc *scl_pin,
unsigned int scl_count,
unsigned int delay)
{
int ret = 0;

16
include/i2c.h
View File

@ -330,6 +330,22 @@ uint i2c_get_chip_addr_offset_mask(struct udevice *dev);
*/
int i2c_deblock(struct udevice *bus);
/**
* i2c_deblock_gpio_loop() - recover a bus from an unknown state by toggling SDA/SCL
*
* This is the inner logic used for toggling I2C SDA/SCL lines as GPIOs
* for deblocking the I2C bus.
*
* @sda_pin: SDA GPIO
* @scl_pin: SCL GPIO
* @scl_count: Number of SCL clock cycles generated to deblock SDA
* @delay: Delay between SCL clock line changes
* @return 0 if OK, -ve on error
*/
struct gpio_desc;
int i2c_deblock_gpio_loop(struct gpio_desc *sda_pin, struct gpio_desc *scl_pin,
unsigned int scl_count, unsigned int delay);
/**
* struct dm_i2c_ops - driver operations for I2C uclass
*