Re: [PATCH v2 2/2] net: phy: dp83826: support TX data voltage tuning

[Andrew Lunn]

> > I could be reading this wrong, but it looks like
> > DP83826_CFG_DAC_MINUS_DEFAULT actually means leave the value
> > unchanged? Is there anything guaranteeing it does in fact have the
> > default value in the hardware?
> >
> >          Andrew
> 
> Yes, the datasheet clearly states the default/reset values of both 
> registers VOD_CFG1 & VOD_CFG2 which are :
> - cfg_dac_minus : 30h
> - cfg_dac_plus : 10h

And the device is actually and always reset by Linux when the driver
loads? Anything the bootloader has done, or a previous kernel, will be
cleared?

Please add this explanation to the commit message.

I'm being pedantic because we have had problems like this in the past.
If a register was not actually set back to the default value, the
bootloader set it to some other value, the board can work fine. Then a
board can came along which the bootloader set the wrong value, and the
default is actually needed. Fixing the driver to actually enforce the
default breaks boards...

	 Andrew