On 02/17/2015 11:52 AM, Sebastian Hesselbarth wrote:

I2C mux pinctrl driver currently determines the number of sub-busses by
counting available pinctrl-names. Unfortunately, this requires each
incarnation of the devicetree node with different available sub-busses
to be rewritten.

This patch reworks i2c-mux-pinctrl driver to count the number of
available sub-nodes instead. The rework should be compatible to the old
way of probing for sub-busses and additionally allows to disable unused
sub-busses with standard DT property status = "disabled".

This also amends the corresponding devicetree binding documentation to
reflect the new functionality to disable unused sub-nodes. While at it,
also fix two references to binding documentation files that miss an "i2c-"
prefix.

Tested-by: Stephen Warren <redacted>

(Both the HDMI and LCD panel DDC busses on NVIDIA Tegra 
Springbank/Seaboard, running next-20150224)