Writing to I2C device during Barebox boot

[Sascha Hauer]

Hi Ivor,

On Thu, Oct 10, 2013 at 06:10:42AM -0700, Ivor Kruger wrote:
> Jan, thanks for the reply, I will look into using git-send-email a bit
> later since I am going to travel this morning fro a few hours.
> 
> My question was however a little bit more generic. Take for example the
> PCM049 board.c file. One of the I2C components it loads is the TWL6030. If
> I wish to write to a register on this device, how would I go about it.

When the driver is probed you should see a /dev/twl6030. You can read
the registers doing:

md -s /dev/twl6030

And you can write registers like this:

mw -d /dev/twl6030 <offset> <value>

If you wish to read/write registers from code grep the code for
twl6030_get.

Sascha

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