[PATCH v2 1/3] dt-bindings: net: dsa: nxp,sja1105: make spi-cpol optional for sja1110

Josua Mayer
2026-04-09T12:35:10Z

Currently, the binding requires 'spi-cpha' for SJA1105 and 'spi-cpol'
for SJA1110.

However, the SJA1110 supports both SPI modes 0 and 2. Mode 2
(cpha=0, cpol=1) is used by the NXP LX2160 Bluebox 3.

On the SolidRun i.MX8DXL HummingBoard Telematics, mode 0 is stable,
while forcing mode 2 introduces CRC errors especially during bursts.

Drop the requirement on spi-cpol for SJA1110.

Fixes: af2eab1a8243 ("dt-bindings: net: nxp,sja1105: document spi-cpol/cpha")
Signed-off-by: Josua Mayer <josua@solid-run.com>
---
Documentation/devicetree/bindings/net/dsa/nxp,sja1105.yaml | 2 --
1 file changed, 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/dsa/nxp,sja1105.yaml b/Documentation/devicetree/bindings/net/dsa/nxp,sja1105.yaml
index 607b7fe8d28ee..0486489114cd8 100644
--- a/Documentation/devicetree/bindings/net/dsa/nxp,sja1105.yaml
+++ b/Documentation/devicetree/bindings/net/dsa/nxp,sja1105.yaml
@@ -143,8 +143,6 @@ allOf:
else:
properties:
spi-cpha: false
- required:
- - spi-cpol

unevaluatedProperties: false

--
2.51.0