[PATCH 3/3] ARM: dts: kirkwood: add kirkwood-km_fixedeth DTS file

On 05/15/2014 03:08 PM, Andrew Lunn wrote:

quoted

+	i2c at 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