With further testing, directly using the spi-sg2044-nor driver on SG2042
does not work. SG2042 is found to lack full compatibility with SG2044.
SG2044 has OPT register and it's necessary to write but SG2042 does not.
Due to other possible hardware detail differences, it is better
to bind SG2042 independently.

Fixes: 8450f1e0d3d0 ("spi: dt-bindings: spi-sg2044-nor: Add SOPHGO SG2042")
Signed-off-by: Zixian Zeng <sycamoremoon376@gmail.com>
---
 Documentation/devicetree/bindings/spi/spi-sg2044-nor.yaml | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/Documentation/devicetree/bindings/spi/spi-sg2044-nor.yaml b/Documentation/devicetree/bindings/spi/spi-sg2044-nor.yaml
index 66e54dedab140a167ad84c43f312f93af2bfa06a..0e7ead7637052a008c64b82477d060d180c43acf 100644
--- a/Documentation/devicetree/bindings/spi/spi-sg2044-nor.yaml
+++ b/Documentation/devicetree/bindings/spi/spi-sg2044-nor.yaml
@@ -14,12 +14,9 @@ allOf:
 
 properties:
   compatible:
-    oneOf:
-      - const: sophgo,sg2044-spifmc-nor
-      - items:
-          - enum:
-              - sophgo,sg2042-spifmc-nor
-          - const: sophgo,sg2044-spifmc-nor
+    enum:
+      - sophgo,sg2042-spifmc-nor
+      - sophgo,sg2044-spifmc-nor
 
   reg:
     maxItems: 1

-- 
2.49.0

On Sun, 20 Jul 2025 16:31:43 +0800, Zixian Zeng wrote:
> With further testing, directly using the spi-sg2044-nor driver on SG2042
> does not work. SG2042 is found to lack full compatibility with SG2044.
> SG2044 has OPT register and it's necessary to write but SG2042 does not.
> Due to other possible hardware detail differences, it is better
> to bind SG2042 independently.
> 
> Fixes: 8450f1e0d3d0 ("spi: dt-bindings: spi-sg2044-nor: Add SOPHGO SG2042")
> Signed-off-by: Zixian Zeng <sycamoremoon376@gmail.com>
> ---
>  Documentation/devicetree/bindings/spi/spi-sg2044-nor.yaml | 9 +++------
>  1 file changed, 3 insertions(+), 6 deletions(-)
> 

Acked-by: Rob Herring (Arm) <robh@kernel.org>