dt-bindings: i2c: add support for 'i2c-gate' subnode

Handle i2c gates similarly to how i2c arbitrators are handled.
This gets rid of a pointless 'reg' property for i2c gates.

I.e. this new and more compact style

        some-gate {
                i2c-gate {
                        #address-cells = <1>;
                        #size-cells = <0>;

                        some-i2c-device@50 {
                                reg = <0x50>;
                        };
                };
        };

instead of the old

        some-gate {
                #address-cells = <1>;
                #size-cells = <0>;

                i2c@0 {
                        reg = <0>;

                        #address-cells = <1>;
                        #size-cells = <0>;

                        some-i2c-device@50 {
                                reg = <0x50>;
                        };
                };
        };

Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Peter Rosin <peda@axentia.se>

1 files changed, 1 insertions, 0 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index cde3e729df2c..353bfe6bbaca 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -5668,6 +5668,7 @@ F:	Documentation/i2c/i2c-topology
 F:      Documentation/i2c/muxes/
 F:      Documentation/devicetree/bindings/i2c/i2c-mux*
 F:      Documentation/devicetree/bindings/i2c/i2c-arb*
+F:      Documentation/devicetree/bindings/i2c/i2c-gate*
 F:      drivers/i2c/i2c-mux.c
 F:      drivers/i2c/muxes/
 F:      include/linux/i2c-mux.h