On 05/15/2014 03:08 PM, Andrew Lunn wrote:
>> + i2c@0 {
>> + compatible = "i2c-gpio";
>> + gpios = < &gpio0 8 GPIO_ACTIVE_HIGH /* sda */
>> + &gpio0 9 GPIO_ACTIVE_HIGH>; /* scl */
>> + i2c-gpio,delay-us = <2>; /* ~100 kHz */
>> + };
>
> Hi Valentin
>
> Anything interesting on the i2c bus?
Well yes, but this is then board specific (for all the Keymile variants of the
reference design). Since all these variants are not mainlined, I have added
nothing yet, but this may come later since we are currently reworking our I2C
bus support/topology.
>
> Does this SoC not have the hardware i2c? I don't see a node for it
> here.
>
The SoC does have the hardware I2C, but we don't use it and use the above
bitbang one instead. I was not in the company when this was chosen/designed. The
main reason is that the Kirkwood's one is not fast enough (clk < 96 kHz) for our
usage (we have A LOT of different things on this BUS, some must be quick - the
bus speed gets changed from (uuuurrghhh) userpace - and this is a NIGHTMARE,
believe me).
Valentin
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