linux-kernel - [PATCH 3/8] dt-bindings: spi: Add Nuvoton WPCM450 Flash Interface Unit (FIU)

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Date:   Sat,  5 Nov 2022 19:59:06 +0100
From:   Jonathan Neuschäfer <j.neuschaefer@....net>
To:     linux-spi@...r.kernel.org, openbmc@...ts.ozlabs.org
Cc:     Lee Jones <lee@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jonathan Neuschäfer <j.neuschaefer@....net>,
        Mark Brown <broonie@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-gpio@...r.kernel.org
Subject: [PATCH 3/8] dt-bindings: spi: Add Nuvoton WPCM450 Flash Interface Unit (FIU)

The Flash Interface Unit (FIU) is the SPI flash controller in the
Nuvoton WPCM450 BMC SoC. It supports four chip selects, and direct
(memory-mapped) access to 16 MiB per chip. Larger flash chips can be
accessed by software-defined SPI transfers.

The FIU in newer NPCM7xx SoCs is not compatible with the WPCM450 FIU.

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@....net>
---
 .../bindings/spi/nuvoton,wpcm450-fiu.yaml     | 76 +++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/spi/nuvoton,wpcm450-fiu.yaml

diff --git a/Documentation/devicetree/bindings/spi/nuvoton,wpcm450-fiu.yaml b/Documentation/devicetree/bindings/spi/nuvoton,wpcm450-fiu.yaml
new file mode 100644
index 0000000000000..dc0ea2184f8d0
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/nuvoton,wpcm450-fiu.yaml
@@ -0,0 +1,76 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/spi/nuvoton,wpcm450-fiu.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Nuvoton WPCM450 Flash Interface Unit (FIU)
+
+maintainers:
+  - Jonathan Neuschäfer <j.neuschaefer@....net>
+
+allOf:
+  - $ref: "/schemas/spi/spi-controller.yaml#"
+
+properties:
+  compatible:
+    const: nuvoton,wpcm450-fiu
+
+  reg:
+    items:
+      - description: FIU registers
+      - description: Memory-mapped flash contents
+
+  reg-names:
+    items:
+      - const: control
+      - const: memory
+    minItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  nuvoton,shm:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description: a phandle to the SHM block (see ../arm/nuvoton,shm.yaml)
+
+required:
+  - compatible
+  - reg
+  - clocks
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/nuvoton,wpcm450-clk.h>
+    spi@...00000 {
+      compatible = "nuvoton,wpcm450-fiu";
+      #address-cells = <1>;
+      #size-cells = <0>;
+      reg = <0xc8000000 0x1000>, <0xc0000000 0x4000000>;
+      reg-names = "control", "memory";
+      clocks = <&clk WPCM450_CLK_FIU>;
+      nuvoton,shm = <&shm>;
+
+      flash@0 {
+        compatible = "jedec,spi-nor";
+      };
+    };
+
+    shm: syscon@...01000 {
+      compatible = "nuvoton,wpcm450-shm", "syscon";
+      reg = <0xc8001000 0x1000>;
+    };
+
+  - |
+    #include <dt-bindings/clock/nuvoton,wpcm450-clk.h>
+    spi@...00000 {
+      compatible = "nuvoton,wpcm450-fiu";
+      // the "memory" resource may be omitted
+      reg = <0xc8000000 0x1000>;
+      reg-names = "control";
+    };
--
2.35.1