linux-kernel - Re: [PATCH v3 1/3] spi: dt-bindings: add Amlogic A113L2 SFC

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Message-ID: <20250826-scratch-cleft-a3f7b36a3cb5@spud>
Date: Tue, 26 Aug 2025 18:51:29 +0100
From: Conor Dooley <conor@...nel.org>
To: xianwei.zhao@...ogic.com
Cc: Mark Brown <broonie@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Liang Yang <liang.yang@...ogic.com>,
	Feng Chen <feng.chen@...ogic.com>, linux-spi@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-amlogic@...ts.infradead.org
Subject: Re: [PATCH v3 1/3] spi: dt-bindings: add Amlogic A113L2 SFC

On Tue, Aug 26, 2025 at 10:10:09AM +0800, Xianwei Zhao via B4 Relay wrote:
> From: Feng Chen <feng.chen@...ogic.com>
> 
> 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@...ogic.com>
> Signed-off-by: Xianwei Zhao <xianwei.zhao@...ogic.com>
> ---
>  .../devicetree/bindings/spi/amlogic,a4-spifc.yaml  | 82 ++++++++++++++++++++++
>  1 file changed, 82 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/spi/amlogic,a4-spifc.yaml b/Documentation/devicetree/bindings/spi/amlogic,a4-spifc.yaml
> new file mode 100644
> index 000000000000..80a89408a832
> --- /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@...ogic.com>
> +  - Feng Chen <feng.chen@...ogic.com>
> +  - Xianwei Zhao <xianwei.zhao@...ogic.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:
> +      Adjust sample timing for RX, Sampling time move later by 1 bus clock.

By 1 bus clock? Or by up to 3? I'd suggest rewording this to something
like "Number of clock cycles by which sampling is delayed" or along
those lines.

> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    enum: [0, 1, 2, 3]
> +    default: 0
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    sfc0: spi@...8d000 {
> +      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>;
> +      };
> +    };
> 
> -- 
> 2.37.1
> 
> 

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