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i2c: Make deblock delay and SCL clock configurable

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Make the delay between SCL line changes and the number of SCL clock
changes configurable as a parameter of the deblock function. No
functional change.

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 16:57:49 +01:00 • committed by Heiko Schocher
parent e24f0a39d0
commit 1f746a2c82
1 changed files with 11 additions and 10 deletions
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21
drivers/i2c/i2c-uclass.c
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@ -502,34 +502,35 @@ static int i2c_gpio_get_pin(struct gpio_desc *pin)
} }
static int i2c_deblock_gpio_loop(struct gpio_desc *sda_pin, static int i2c_deblock_gpio_loop(struct gpio_desc *sda_pin,
struct gpio_desc *scl_pin) struct gpio_desc *scl_pin,
unsigned int scl_count,
unsigned int delay)
{ {
int counter = 9;
int ret = 0; int ret = 0;
i2c_gpio_set_pin(sda_pin, 1); i2c_gpio_set_pin(sda_pin, 1);
i2c_gpio_set_pin(scl_pin, 1); i2c_gpio_set_pin(scl_pin, 1);
udelay(5); udelay(delay);
/* Toggle SCL until slave release SDA */ /* Toggle SCL until slave release SDA */
while (counter-- >= 0) { while (scl_count-- >= 0) {
i2c_gpio_set_pin(scl_pin, 1); i2c_gpio_set_pin(scl_pin, 1);
udelay(5); udelay(delay);
i2c_gpio_set_pin(scl_pin, 0); i2c_gpio_set_pin(scl_pin, 0);
udelay(5); udelay(delay);
if (i2c_gpio_get_pin(sda_pin)) if (i2c_gpio_get_pin(sda_pin))
break; break;
} }
/* Then, send I2C stop */ /* Then, send I2C stop */
i2c_gpio_set_pin(sda_pin, 0); i2c_gpio_set_pin(sda_pin, 0);
udelay(5); udelay(delay);
i2c_gpio_set_pin(scl_pin, 1); i2c_gpio_set_pin(scl_pin, 1);
udelay(5); udelay(delay);
i2c_gpio_set_pin(sda_pin, 1); i2c_gpio_set_pin(sda_pin, 1);
udelay(5); udelay(delay);
if (!i2c_gpio_get_pin(sda_pin) || !i2c_gpio_get_pin(scl_pin)) if (!i2c_gpio_get_pin(sda_pin) || !i2c_gpio_get_pin(scl_pin))
ret = -EREMOTEIO; ret = -EREMOTEIO;
@ -561,7 +562,7 @@ static int i2c_deblock_gpio(struct udevice *bus)
goto out_no_pinctrl; goto out_no_pinctrl;
} }
ret0 = i2c_deblock_gpio_loop(&gpios[PIN_SDA], &gpios[PIN_SCL]); ret0 = i2c_deblock_gpio_loop(&gpios[PIN_SDA], &gpios[PIN_SCL], 9, 5);
ret = pinctrl_select_state(bus, "default"); ret = pinctrl_select_state(bus, "default");
if (ret) { if (ret) {