Hello Marek,
Am 07.02.2020 um 16:57 schrieb Marek Vasut:
Add option to send start condition after deblocking SDA.
Signed-off-by: Marek Vasut marex@denx.de
drivers/i2c/i2c-uclass.c | 23 ++++++++++++++++++++--- include/i2c.h | 4 +++- 2 files changed, 23 insertions(+), 4 deletions(-)
Reviewed-by: Heiko Schocher hs@denx.de
diff --git a/drivers/i2c/i2c-uclass.c b/drivers/i2c/i2c-uclass.c index 86f529241f..e9ec388576 100644 --- a/drivers/i2c/i2c-uclass.c +++ b/drivers/i2c/i2c-uclass.c @@ -504,9 +504,10 @@ static int i2c_gpio_get_pin(struct gpio_desc *pin) int i2c_deblock_gpio_loop(struct gpio_desc *sda_pin, struct gpio_desc *scl_pin, unsigned int scl_count,
unsigned int start_count, unsigned int delay)
- int ret = 0;
int i, ret = -EREMOTEIO;
i2c_gpio_set_pin(sda_pin, 1); i2c_gpio_set_pin(scl_pin, 1);
@@ -518,8 +519,24 @@ int i2c_deblock_gpio_loop(struct gpio_desc *sda_pin, udelay(delay); i2c_gpio_set_pin(scl_pin, 0); udelay(delay);
if (i2c_gpio_get_pin(sda_pin))
if (i2c_gpio_get_pin(sda_pin)) {ret = 0; break;}}
if (!ret && start_count) {
for (i = 0; i < start_count; i++) {/* Send start condition */udelay(delay);i2c_gpio_set_pin(sda_pin, 1);udelay(delay);i2c_gpio_set_pin(scl_pin, 1);udelay(delay);i2c_gpio_set_pin(sda_pin, 0);udelay(delay);i2c_gpio_set_pin(scl_pin, 0);}}
/* Then, send I2C stop */
@@ -562,7 +579,7 @@ static int i2c_deblock_gpio(struct udevice *bus) goto out_no_pinctrl; }
- ret0 = i2c_deblock_gpio_loop(&gpios[PIN_SDA], &gpios[PIN_SCL], 9, 5);
ret0 = i2c_deblock_gpio_loop(&gpios[PIN_SDA], &gpios[PIN_SCL], 9, 0, 5);
ret = pinctrl_select_state(bus, "default"); if (ret) {
diff --git a/include/i2c.h b/include/i2c.h index 7c92042c58..059200115a 100644 --- a/include/i2c.h +++ b/include/i2c.h @@ -339,12 +339,14 @@ int i2c_deblock(struct udevice *bus);
- @sda_pin: SDA GPIO
- @scl_pin: SCL GPIO
- @scl_count: Number of SCL clock cycles generated to deblock SDA
- @start_count:Number of I2C start conditions sent after deblocking SDA
Is there a tab missing? If so I can add it, when applying this patch.
- @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);
unsigned int scl_count, unsigned int start_count,unsigned int delay);/**
- struct dm_i2c_ops - driver operations for I2C uclass
bye, Heiko