doc: bindings: Aquantia PHY node binding

A couple of optional properties have been introduced for Aquantia PHY
allowing the driver to set up wiring related configuration points that
are otherwise driven by firmware.

Signed-off-by: Alex Marginean <alexandru.marginean@nxp.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

diff --git a/doc/device-tree-bindings/net/aquantia-phy.txt b/doc/device-tree-bindings/net/aquantia-phy.txt
new file mode 100644 (file)
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+PHY nodes for Aquantia devices.
+
+This text describes properties that are applicable to Aquantia PHY nodes in
+addition to the bindings in phy.txt.
+
+Aquantia PHYs allow some flexibility in the way they are wired in a system,
+they allow MDI pins to be reversed, LEDs linked up in different weays, have an
+I2C slave interface that can be used for debug.  Normally the configuration
+corresponding to these is driven by the PHY firmware with the downside that
+a custom firmware is needed for each integration of a PHY.
+Several optional bindings are defined that allow these configuration points to
+be driven by the PHY driver and reduce dependency on specific FW versions.
+
+Optional properties:
+mdi-reversal: 0 or 1 indicating that reversal must be disabled/enabled.
+              Firmware default is used if the property is missing.
+smb-addr:     I2C/SMBus address to use, firmware default is used if the property
+              is missing.
+
+Example node:
+phy@00 {
+       reg = <0x00>;
+       mdi-reversal = <1>;
+       smb-addr = <0x25>;
+};