Hello Marek,
Am 07.02.2020 um 16:57 schrieb Marek Vasut:
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 <ma...@denx.de>
---
drivers/i2c/i2c-gpio.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
Nitpick: I see no entry in doc/device-tree-bindings/i2c/i2c-gpio.txt
for the new dts binding ... please send a follow up patch which adds it,
or a v2 for this one, thanks!
Reviewed-by: Heiko Schocher <h...@denx.de>
bye,
Heiko
diff --git a/drivers/i2c/i2c-gpio.c b/drivers/i2c/i2c-gpio.c
index 4e8fa21473..b6b6ba9ee8 100644
--- a/drivers/i2c/i2c-gpio.c
+++ b/drivers/i2c/i2c-gpio.c
@@ -305,6 +305,20 @@ 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 +355,7 @@ 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,
--
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