Re: [RFC 2/5] i3c: Add core I3C infrastructure

From: Boris Brezillon
Date: Tue Aug 01 2017 - 17:47:58 EST

Le Tue, 1 Aug 2017 19:27:03 +0200,
Wolfram Sang <wsa@xxxxxxxxxxxxx> a Ãcrit :

> > I'm surprised they didn't allow for slave clock stretching when
> > communicating with a legacy i2c device, it will prohibit use of a rather
> > large class of devices. :(
> Yes, but I3C is push/pull IIRC.

It is.

> > As for interrupts you are always free to wire up an out-of-band
> > interrupt like before. :)
> Yes, my wording was a bit too strong. It is possible, sure. Yet, I
> understood that one of the features of I3C is to have in-band interrupt
> support. We will see if the demand for backward compatibility or "saving
> pins" is higher.

Indeed, you can use in-band interrupts if your device is able to
generate them, but that doesn't prevent I3C device designers from using
an external pin to signal interrupts if they prefer.