spi: dt-bindings: add Amlogic A113L2 SFC

The Flash Controller is derived by adding an SPI path to the original
raw NAND controller. This controller supports two modes: raw mode and
SPI mode. The raw mode has already been implemented in the community,
and the SPI mode is described here.

Add bindings for Amlogic A113L2 SPI Flash Controller.

Signed-off-by: Feng Chen <feng.chen@amlogic.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Xianwei Zhao <xianwei.zhao@amlogic.com>
Link: https://patch.msgid.link/20250910-spifc-v6-1-1574aa9baebd@amlogic.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/spi/amlogic,a4-spifc.yaml b/Documentation/devicetree/bindings/spi/amlogic,a4-spifc.yaml
new file mode 100644 (file)
index 0000000..b4cef83
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/amlogic,a4-spifc.yaml
@@ -0,0 +1,82 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright (C) 2025 Amlogic, Inc. All rights reserved
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/spi/amlogic,a4-spifc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: SPI flash controller for Amlogic ARM SoCs
+
+maintainers:
+  - Liang Yang <liang.yang@amlogic.com>
+  - Feng Chen <feng.chen@amlogic.com>
+  - Xianwei Zhao <xianwei.zhao@amlogic.com>
+
+description:
+  The Amlogic SPI flash controller is an extended version of the Amlogic NAND
+  flash controller. It supports SPI Nor Flash and SPI NAND Flash(where the Host
+  ECC HW engine could be enabled).
+
+allOf:
+  - $ref: /schemas/spi/spi-controller.yaml#
+
+properties:
+  compatible:
+    const: amlogic,a4-spifc
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: clock apb gate
+      - description: clock used for the controller
+
+  clock-names:
+    items:
+      - const: gate
+      - const: core
+
+  interrupts:
+    maxItems: 1
+
+  amlogic,rx-adj:
+    description:
+      Number of clock cycles by which sampling is delayed.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [0, 1, 2, 3]
+    default: 0
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    sfc0: spi@fe08d000 {
+      compatible = "amlogic,a4-spifc";
+      reg = <0xfe08d000 0x800>;
+      clocks = <&clkc_periphs 31>,
+               <&clkc_periphs 102>;
+      clock-names = "gate", "core";
+
+      pinctrl-0 = <&spiflash_default>;
+      pinctrl-names = "default";
+
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      flash@0 {
+          compatible = "spi-nand";
+          reg = <0>;
+          #address-cells = <1>;
+          #size-cells = <1>;
+          nand-ecc-engine = <&sfc0>;
+          nand-ecc-strength = <8>;
+          nand-ecc-step-size = <512>;
+      };
+    };