Re: [PATCH v3 3/4] arm64: dts: apple: t8103: Add i2c nodes

On Wed, Nov 24, 2021 at 6:42 AM Hector Martin [off-list ref] wrote:

Pulling down an I2C bus between transactions is not legal; the idle
state has to be high.

Oh right.

Apple are actually not very good at configuring GPIOs for power saving;
e.g. the I/Os for that unused i2c bus still have their input buffers
turned on, which is a waste of power. If they wanted to save the
smallest drop of power they'd turn that off. But the effect of this is
so trivial it probably makes no difference in the context of a laptop,
nevermind a desktop like the Mac Mini.

Hm that's true. The saying is that 99% is the backlight, the remaining 1% isn't
so significant after that.

Yours,
Linus Walleij