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i2c: gpio: Run deblock sequence on probe

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Add deblock dequence for the I2C bus, needed on some devices. This sequence
is issued once, when probing the driver, and is controlled by DT property,
"i2c-gpio,deblock".

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 16:57:52 +01:00 committed by Heiko Schocher
parent a191728633
commit 4368c6a2bc
1 changed files with 16 additions and 0 deletions
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16
drivers/i2c/i2c-gpio.c
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@ -305,6 +305,21 @@ static int i2c_gpio_set_bus_speed(struct udevice *dev, unsigned int speed_hz)
return 0;
}
static int i2c_gpio_drv_probe(struct udevice *dev)
{
if (dev_read_bool(dev, "i2c-gpio,deblock")) {
/* @200kHz 9 clocks = 44us, 62us is ok */
const unsigned int DELAY_ABORT_SEQ = 62;
struct i2c_gpio_bus *bus = dev_get_priv(dev);
return i2c_deblock_gpio_loop(&bus->gpios[PIN_SDA],
&bus->gpios[PIN_SCL],
16, 5, DELAY_ABORT_SEQ);
}
return 0;
}
static int i2c_gpio_ofdata_to_platdata(struct udevice *dev)
{
struct i2c_gpio_bus *bus = dev_get_priv(dev);
@ -341,6 +356,7 @@ U_BOOT_DRIVER(i2c_gpio) = {
.name = "i2c-gpio",
.id = UCLASS_I2C,
.of_match = i2c_gpio_ids,
.probe = i2c_gpio_drv_probe,
.ofdata_to_platdata = i2c_gpio_ofdata_to_platdata,
.priv_auto_alloc_size = sizeof(struct i2c_gpio_bus),
.ops = &i2c_gpio_ops,