[PATCH net-next v2 6/7] dt-bindings: net: adi,adin1110: Add adi,spi-oa-tc6

[Iustin Stolniceanu <iustin.stolniceanu@analog.com>]

From: Ciprian Regus <ciprian.regus@analog.com>

The ADIN1110 and ADIN2111 support two SPI host interface protocols:
the generic SPI protocol and the OPEN Alliance TC6 protocol. The
protocol is selected by the state of the SPI_CFG1 pin, which the device
latches when it comes out of reset, together with SPI_CFG0, which
selects CRC (generic SPI) or protection (OPEN Alliance) mode.

The protocol is set by the board hardware, so the driver must know it
in advance. Add a boolean property to describe a device configured for
the OPEN Alliance TC6 protocol. Without it, the generic SPI protocol is
assumed, as before.

adi,spi-crc enables the CRC of the generic SPI protocol, so it is not
allowed together with adi,spi-oa-tc6. The OPEN Alliance protection mode
needs no property, as the driver reads it from the PROTE bit in CONFIG0.

Signed-off-by: Ciprian Regus <ciprian.regus@analog.com>
Signed-off-by: Iustin Stolniceanu <iustin.stolniceanu@analog.com>
---
 .../devicetree/bindings/net/adi,adin1110.yaml        | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/adi,adin1110.yaml b/Documentation/devicetree/bindings/net/adi,adin1110.yaml
index 0a73e01d7f97..fa30787c663d 100644
--- a/Documentation/devicetree/bindings/net/adi,adin1110.yaml
+++ b/Documentation/devicetree/bindings/net/adi,adin1110.yaml
@@ -28,6 +28,12 @@ description: |
 allOf:
   - $ref: ethernet-controller.yaml#
   - $ref: /schemas/spi/spi-peripheral-props.yaml#
+  - if:
+      required:
+        - adi,spi-oa-tc6
+    then:
+      properties:
+        adi,spi-crc: false
 
 properties:
   compatible:
@@ -43,6 +49,12 @@ properties:
       Enable CRC8 checks on SPI read/writes.
     type: boolean
 
+  adi,spi-oa-tc6:
+    description: |
+      The device is configured, through the SPI_CFG1 pin, for the
+      OPEN Alliance TC6 protocol instead of the generic SPI one.
+    type: boolean
+
   interrupts:
     maxItems: 1
 
-- 
2.43.0