Re: [PATCH] i2c: sh_mobile: implement atomic transfers

[Wolfram Sang <wsa@the-dreams.de>]

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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@the-dreams.de> 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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