From 4368c6a2bc6b37f8a547a566da0ad4060f578195 Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Fri, 7 Feb 2020 16:57:52 +0100 Subject: i2c: gpio: Run deblock sequence on probe 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 Reviewed-by: Heiko Schocher --- drivers/i2c/i2c-gpio.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) (limited to 'drivers/i2c') diff --git a/drivers/i2c/i2c-gpio.c b/drivers/i2c/i2c-gpio.c index 4e8fa21..d56540b 100644 --- a/drivers/i2c/i2c-gpio.c +++ b/drivers/i2c/i2c-gpio.c @@ -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, -- cgit v1.1