On Mon, Jun 15, 2020 at 02:58:59PM +0200, Geert Uytterhoeven wrote:
> Hi Wolfram,
>
> On Mon, Jun 15, 2020 at 2:48 PM Wolfram Sang <wsa@xxxxxxxxxxxxx> wrote:
> > > Uli: can you check if atomic transfers work with the touchscreen or
> > > codec on Armadillo-800-EVA?
> >
> > Atmoic transfers are used for very late communication (e.g. PMIC).
> > Touchscreens and codecs should be already down, then.
>
> So how to test atomic transfers are working if the I2C controller is part of
> a real power domain? Add a fake PMIC?
Hack something like this into a driver which is executed late:
struct i2c_msg simple_msg = { ... }
adap = i2c_get_adapter(0); // or whatever number
i2c_transfer(adap, simple_msg, 1);
You don't need client struct, you can hardcode some address into
simple_msg directly.
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