dt-bindings: eeprom: at25: use "size" for FRAMs without device ID

commit 534c702c3c234665ca2fe426a9fbb12281e55d55 upstream.

Not all FRAM chips have a device ID and implement the corresponding read
command. Thus the memory size, which is contained in the device ID,
cannot be detected and has to be set manually as it is done for EEPROMs.

Link: https://lore.kernel.org/all/[email protected]/
Signed-off-by: Markus Heidelberg <[email protected]>
Reviewed-by: Rob Herring (Arm) <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: marcows

Documentation/devicetree/bindings/eeprom/at25.yaml

@@ -56,6 +56,7 @@ properties:
     $ref: /schemas/types.yaml#/definitions/uint32
     description:
       Total eeprom size in bytes.
+      Also used for FRAMs without device ID where the size cannot be detected.
 
   address-width:
     $ref: /schemas/types.yaml#/definitions/uint32
@@ -146,4 +147,11 @@ examples:
             reg = <1>;
             spi-max-frequency = <40000000>;
         };
+
+        fram@2 {
+            compatible = "cypress,fm25", "atmel,at25";
+            reg = <2>;
+            spi-max-frequency = <20000000>;
+            size = <2048>;
+        };
     };