Hi,
2016-12-22 20:11 GMT+01:00 Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>:
> Hello,
>
> On Thu, Dec 22, 2016 at 02:35:02PM +0100, M'boumba Cedric Madianga wrote:
>> @@ -337,6 +350,16 @@
>> slew-rate = <2>;
>> };
>> };
>> +
>> + i2c1_pins_b: i2c1@0 {
>> + pins1 {
>> + pinmux = <STM32F429_PB9_FUNC_I2C1_SDA>;
>> + drive-open-drain;
>> + };
>> + pins2 {
>> + pinmux = <STM32F429_PB6_FUNC_I2C1_SCL>;
>> + };
>
> the second doesn't need the open-drain property? Why?
I thought that open-drain was only needed for SDA line.
But after double-checking I2C specification, it seems that SDA and SCL
lines need open-drain or open-collector to perform the wired-AND
function.
I will do some trials with this config and will fix it in the V8.
Thanks
>
>> + };
>> };
>
> Best regards
> Uwe
>
> --
> Pengutronix e.K. | Uwe Kleine-König |
> Industrial Linux Solutions | http://www.pengutronix.de/ |
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