spi: Convert the Aspeed SMC controllers device tree binding

The "interrupt" property is optional because it is only necessary for
controllers supporting DMAs (Not implemented yet in the new driver).

Cc: Chin-Ting Kuo <chin-ting_kuo@aspeedtech.com>
Tested-by: Joel Stanley <joel@jms.id.au>
Tested-by: Tao Ren <rentao.bupt@gmail.com>
Tested-by: Jae Hyun Yoo <quic_jaehyoo@quicinc.com>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Link: https://lore.kernel.org/r/20220509175616.1089346-3-clg@kaod.org
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: legoater

Documentation/devicetree/bindings/mtd/aspeed-smc.txt

@@ -0,0 +1,82 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/spi/aspeed,ast2600-fmc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Aspeed SMC controllers bindings
+
+maintainers:
+  - Chin-Ting Kuo <chin-ting_kuo@aspeedtech.com>
+  - Cédric Le Goater <clg@kaod.org>
+
+description: |
+  This binding describes the Aspeed Static Memory Controllers (FMC and
+  SPI) of the AST2400, AST2500 and AST2600 SOCs.
+
+allOf:
+  - $ref: "spi-controller.yaml#"
+
+properties:
+  compatible:
+    enum:
+      - aspeed,ast2600-fmc
+      - aspeed,ast2600-spi
+      - aspeed,ast2500-fmc
+      - aspeed,ast2500-spi
+      - aspeed,ast2400-fmc
+      - aspeed,ast2400-spi
+
+  reg:
+    items:
+      - description: registers
+      - description: memory mapping
+
+  clocks:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/interrupt-controller/aspeed-scu-ic.h>
+    #include <dt-bindings/clock/ast2600-clock.h>
+
+    spi@1e620000 {
+        reg = <0x1e620000 0xc4>, <0x20000000 0x10000000>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+        compatible = "aspeed,ast2600-fmc";
+        clocks = <&syscon ASPEED_CLK_AHB>;
+        interrupts = <GIC_SPI 39 IRQ_TYPE_LEVEL_HIGH>;
+
+        flash@0 {
+                reg = < 0 >;
+                compatible = "jedec,spi-nor";
+                spi-max-frequency = <50000000>;
+                spi-rx-bus-width = <2>;
+        };
+
+        flash@1 {
+                reg = < 1 >;
+                compatible = "jedec,spi-nor";
+                spi-max-frequency = <50000000>;
+                spi-rx-bus-width = <2>;
+        };
+
+        flash@2 {
+                reg = < 2 >;
+                compatible = "jedec,spi-nor";
+                spi-max-frequency = <50000000>;
+                spi-rx-bus-width = <2>;
+        };
+    };

Documentation/devicetree/bindings/spi/aspeed,ast2600-fmc.yaml

@@ -3099,6 +3099,15 @@ S:	Maintained
 F:	Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
 F:	drivers/mmc/host/sdhci-of-aspeed*
 
+ASPEED SMC SPI DRIVER
+M:	Chin-Ting Kuo <chin-ting_kuo@aspeedtech.com>
+M:	Cédric Le Goater <clg@kaod.org>
+L:	linux-aspeed@lists.ozlabs.org (moderated for non-subscribers)
+L:	openbmc@lists.ozlabs.org (moderated for non-subscribers)
+L:	linux-spi@vger.kernel.org
+S:	Maintained
+F:	Documentation/devicetree/bindings/spi/aspeed,ast2600-fmc.yaml
+
 ASPEED VIDEO ENGINE DRIVER
 M:	Eddie James <eajames@linux.ibm.com>
 L:	linux-media@vger.kernel.org