[PATCH 2/7] dt-bindings: net: phy: add bindings for the IC Plus Corp. IP101A/G PHYs

[Martin Blumenstingl]

The IP101A and IP101G series both have various models. Depending on the
board implementation we need a special property for the IP101GR (32-pin
LQFP package) PHY:
pin 21 ("RXER/INTR_32") outputs the "receive error" signal by default
(LOW means "normal operation", HIGH means that there's either a decoding
error of the received signal or that the PHY is receiving LPI). This pin
can also be switched to INTR32 mode, where the interrupt signal is
routed to this pin. The other PHYs don't need this special handling
because they have more pins available so the interrupt function gets a
dedicated pin.

This adds two properties to either select the "receive error" or
"interrupt" function of pin 21. Not specifying any function means that
the default set by the bootloader is used. This is required because the
IP101GR cannot be differentiated between other IP101 PHYs as the PHY
identification registers on all of these is 0x02430c54.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>
---
 .../bindings/net/icplus-ip101ag.txt           | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/net/icplus-ip101ag.txt

diff --git a/Documentation/devicetree/bindings/net/icplus-ip101ag.txt b/Documentation/devicetree/bindings/net/icplus-ip101ag.txt
new file mode 100644
index 000000000000..a784592bbb15
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/icplus-ip101ag.txt
@@ -0,0 +1,19 @@
+IC Plus Corp. IP101A / IP101G Ethernet PHYs
+
+There are different models of the IP101G Ethernet PHY:
+- IP101GR (32-pin QFN package)
+- IP101G (die only, no package)
+- IP101GA (48-pin LQFP package)
+
+There are different models of the IP101A Ethernet PHY (which is the
+predecessor of the IP101G):
+- IP101A (48-pin LQFP package)
+- IP101AH (48-pin LQFP package)
+
+Optional properties for the IP101GR (32-pin QFN package):
+
+- icplus,select-rx-error:
+  pin 21 ("RXER/INTR_32") will output the receive error status.
+  interrupts are not routed outside the PHY in this mode.
+- icplus,select-interrupt:
+  pin 21 ("RXER/INTR_32") will output the interrupt signal.
-- 
2.19.1