[v3 1/4] dt-bindings: spi: Add binding file for ASPEED FMC/SPI memory controller

[Chin-Ting Kuo]

Create binding file with YAML syntax for ASPEED FMC/SPI memory controller.

Signed-off-by: Chin-Ting Kuo <chin-ting_kuo@xxxxxxxxxxxxxx>
---
 .../bindings/spi/aspeed,spi-aspeed.yaml       | 66 +++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/spi/aspeed,spi-aspeed.yaml

diff --git a/Documentation/devicetree/bindings/spi/aspeed,spi-aspeed.yaml b/Documentation/devicetree/bindings/spi/aspeed,spi-aspeed.yaml
new file mode 100644
index 000000000000..41b9692c7226
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/aspeed,spi-aspeed.yaml
@@ -0,0 +1,66 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/spi/aspeed,spi-aspeed.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: SPI memory controller for ASPEED SoCs
+
+maintainers:
+  - Chin-Ting Kuo <chin-ting_kuo@xxxxxxxxxxxxxx>
+
+description: |
+  There are three SPI memory controllers embedded in a ASPEED SoC.
+  They are usually connected to SPI NOR flashes. Each of them has
+  more than a chip select. They also support SPI single, dual and
+  quad IO modes for SPI NOR flash.
+
+allOf:
+  - $ref: /spi/spi-controller.yaml#
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - enum:
+              - aspeed,ast2600-fmc
+              - aspeed,ast2600-spi
+
+  reg:
+    items:
+      - description: the control register location and length
+      - description: the flash memory mapping address and length
+
+  clocks:
+    description: AHB bus clock which will be converted to SPI bus clock
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - num-cs
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/ast2600-clock.h>
+    spi1: spi@1e630000 {
+      compatible = "aspeed,ast2600-spi";
+      reg = <0x1e630000 0xc4>, <0x30000000 0x10000000>;
+      reg-names = "spi_ctrl_reg", "spi_mmap";
+      clocks = <&syscon ASPEED_CLK_AHB>;
+      num-cs = <2>;
+      #address-cells = <1>;
+      #size-cells = <0>;
+      flash@0 {
+        compatible = "jedec,spi-nor";
+        reg = <0>;
+        spi-max-frequency = <50000000>;
+      };
+      flash@1 {
+        compatible = "jedec,spi-nor";
+        reg = <1>;
+        spi-max-frequency = <50000000>;
+      };
+    };
-- 
2.17.1