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spi: Add Nuvoton WPCM450 Flash Interface Unit (FIU) bindings
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@gmx.net> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Link: https://lore.kernel.org/r/20221124191400.287918-2-j.neuschaefer@gmx.net Signed-off-by: Mark Brown <broonie@kernel.org>
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# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/spi/nuvoton,wpcm450-fiu.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Nuvoton WPCM450 Flash Interface Unit (FIU)
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maintainers:
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- Jonathan Neuschäfer <j.neuschaefer@gmx.net>
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allOf:
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- $ref: /schemas/spi/spi-controller.yaml#
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properties:
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compatible:
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const: nuvoton,wpcm450-fiu
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reg:
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items:
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- description: FIU registers
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- description: Memory-mapped flash contents
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reg-names:
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items:
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- const: control
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- const: memory
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interrupts:
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maxItems: 1
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clocks:
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maxItems: 1
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nuvoton,shm:
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$ref: /schemas/types.yaml#/definitions/phandle
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description: a phandle to the SHM block (see ../arm/nuvoton,shm.yaml)
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required:
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- compatible
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- reg
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- clocks
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unevaluatedProperties: false
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examples:
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- |
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#include <dt-bindings/clock/nuvoton,wpcm450-clk.h>
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spi@c8000000 {
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compatible = "nuvoton,wpcm450-fiu";
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reg = <0xc8000000 0x1000>, <0xc0000000 0x4000000>;
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#address-cells = <1>;
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#size-cells = <0>;
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reg-names = "control", "memory";
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clocks = <&clk WPCM450_CLK_FIU>;
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nuvoton,shm = <&shm>;
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flash@0 {
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compatible = "jedec,spi-nor";
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};
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};
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shm: syscon@c8001000 {
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compatible = "nuvoton,wpcm450-shm", "syscon";
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reg = <0xc8001000 0x1000>;
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};
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