On Wed, 11 Jul 2018 16:10:10 +0200
Arnd Bergmann [off-list ref] wrote:

On Fri, Jun 22, 2018 at 12:49 PM, Boris Brezillon
[off-list ref] wrote:

quoted

A new I3C subsystem has been added and a generic description has been
created to represent the I3C bus and the devices connected on it.
 

quoted

+I2C devices
+===========
+
+Each I2C device connected to the bus should be described in a subnode. All
+properties described in Documentation/devicetree/bindings/i2c/i2c.txt are
+valid here, but several new properties have been added.
+
+New constraint on existing properties:
+--------------------------------------  

...

quoted

+  + third cell: should be 0  

What for? Just to be future-proof, or do you have something specific
in mind here?

Even if I2C devices only need 1 cell, I3C devices need 3 (1 for the
static address and 2 for the PID). Since both type of devices are
described under the same bus node, and we can have different
#address-cells, I had to put 0-padding in the last cell.
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