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| author | Marek Vasut <marex@denx.de> | 2020-02-07 16:57:51 +0100 |
|---|---|---|
| committer | Heiko Schocher <hs@denx.de> | 2020-03-16 07:46:21 +0100 |
| commit | a19172863335dcaa1b2a98009f0bfef2a61ab4a2 (patch) | |
| tree | 67558ece91aae82299ca1717470a16877658aff0 /drivers/i2c/i2c-uclass.c | |
| parent | 7231522a5ed1545d3206f5204676897d62a24f5f (diff) | |
| download | u-boot-a19172863335dcaa1b2a98009f0bfef2a61ab4a2.zip u-boot-a19172863335dcaa1b2a98009f0bfef2a61ab4a2.tar.gz u-boot-a19172863335dcaa1b2a98009f0bfef2a61ab4a2.tar.bz2 | |
i2c: Add option to send start condition after deblocking
Add option to send start condition after deblocking SDA.
Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Heiko Schocher <hs@denx.de>
Diffstat (limited to 'drivers/i2c/i2c-uclass.c')
| -rw-r--r-- | drivers/i2c/i2c-uclass.c | 23 |
1 files changed, 20 insertions, 3 deletions
diff --git a/drivers/i2c/i2c-uclass.c b/drivers/i2c/i2c-uclass.c index 86f5292..e9ec388 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) { |