spi: dt-bindings: snps,dw-apb-ssi: Add starfive,jhb100-sfc

Add a new compatible string "starfive,jhb100-sfc" for the StarFive
JHB100 SPI Flash Controller, it based on the Synopsys DesignWare
SSI version 2.00a but with minor modifications.

Due to these minor modifications, it only supports access for flash
memory and requires a system controller register to configure the
address mode filter for SPI NOR flash devices.

The starfive,sfc-filter-syscon property is required to provide a phandle
to the system controller that manages switching between 3-byte and
4-byte addressing modes, essential for supporting SPI NOR flash devices
with different address width requirements.

Signed-off-by: Changhuang Liang <changhuang.liang@starfivetech.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://patch.msgid.link/20260803124044.156998-11-changhuang.liang@starfivetech.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.yaml

@@ -33,6 +33,17 @@ allOf:
     else:
       properties:
         amd,pensando-elba-syscon: false
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: starfive,jhb100-sfc
+    then:
+      required:
+        - starfive,sfc-filter-syscon
+    else:
+      properties:
+        starfive,sfc-filter-syscon: false
 
 properties:
   compatible:
@@ -67,6 +78,8 @@ properties:
         const: amd,pensando-elba-spi
       - description: Canaan Kendryte K210 SoS SPI Controller
         const: canaan,k210-spi
+      - description: StarFive JHB100 SoC SPI Flash Controller
+        const: starfive,jhb100-sfc
       - description: Renesas RZ/N1 SPI Controller
         items:
           - const: renesas,r9a06g032-spi # RZ/N1D
@@ -141,6 +154,15 @@ properties:
       Block address to control SPI chip-selects. The Elba SoC system controller
       provides an interface to override the native DWC SSI CS control.
 
+  starfive,sfc-filter-syscon:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    description:
+      Phandle to the system controller register that controls the SPI NOR flash
+      address mode filter. This system controller interface provides additional
+      configuration to switch between 3-byte and 4-byte addressing modes, which
+      is required when accessing SPI NOR flash devices with different address
+      width requirements.
+
 patternProperties:
   "@[0-9a-f]$":
     type: object