linux-kernel - [PATCH v4 4/5] dt-bindings: spi: add binding doc for spi-mtk-snfi

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Message-Id: <20220407150652.21885-5-gch981213@gmail.com>
Date:   Thu,  7 Apr 2022 23:06:51 +0800
From:   Chuanhong Guo <gch981213@...il.com>
To:     linux-spi@...r.kernel.org
Cc:     Chuanhong Guo <gch981213@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Roger Quadros <rogerq@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Cai Huoqing <cai.huoqing@...ux.dev>,
        Florian Fainelli <f.fainelli@...il.com>,
        Colin Ian King <colin.king@...el.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Paul Cercueil <paul@...pouillou.net>,
        Pratyush Yadav <p.yadav@...com>, Yu Kuai <yukuai3@...wei.com>,
        devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED
        DEVICE TREE BINDINGS),
        linux-arm-kernel@...ts.infradead.org (moderated list:ARM/Mediatek SoC
        support),
        linux-mediatek@...ts.infradead.org (moderated list:ARM/Mediatek SoC
        support), linux-kernel@...r.kernel.org (open list),
        linux-mtd@...ts.infradead.org (open list:NAND FLASH SUBSYSTEM)
Subject: [PATCH v4 4/5] dt-bindings: spi: add binding doc for spi-mtk-snfi

Add device-tree binding documentation for Mediatek SPI-NAND Flash
Interface.

Signed-off-by: Chuanhong Guo <gch981213@...il.com>
---

Changes since v1:
  1. add a blank line between properties in dt binding doc
  2. rename ecc-engine to nand-ecc-engine for the generic properties

Change since v2: none
Change since v3: fix a missing rename in v1

 .../bindings/spi/mediatek,spi-mtk-snfi.yaml   | 88 +++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/spi/mediatek,spi-mtk-snfi.yaml

diff --git a/Documentation/devicetree/bindings/spi/mediatek,spi-mtk-snfi.yaml b/Documentation/devicetree/bindings/spi/mediatek,spi-mtk-snfi.yaml
new file mode 100644
index 000000000000..686b69e4924c
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/mediatek,spi-mtk-snfi.yaml
@@ -0,0 +1,88 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/spi/mediatek,spi-mtk-snfi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: SPI-NAND flash controller for MediaTek ARM SoCs
+
+maintainers:
+  - Chuanhong Guo <gch981213@...il.com>
+
+description: |
+  The Mediatek SPI-NAND flash controller is an extended version of
+  the Mediatek NAND flash controller. It can perform standard SPI
+  instructions with one continuous write and one read for up-to 0xa0
+  bytes. It also supports typical SPI-NAND page cache operations
+  in single, dual or quad IO mode with piplined ECC encoding/decoding
+  using the accompanying ECC engine. There should be only one spi
+  slave device following generic spi bindings.
+
+allOf:
+  - $ref: /schemas/spi/spi-controller.yaml#
+
+properties:
+  compatible:
+    enum:
+      - mediatek,mt7622-snand
+      - mediatek,mt7629-snand
+
+  reg:
+    items:
+      - description: core registers
+
+  interrupts:
+    items:
+      - description: NFI interrupt
+
+  clocks:
+    items:
+      - description: clock used for the controller
+      - description: clock used for the SPI bus
+
+  clock-names:
+    items:
+      - const: nfi_clk
+      - const: pad_clk
+
+  nand-ecc-engine:
+    description: device-tree node of the accompanying ECC engine.
+    $ref: /schemas/types.yaml#/definitions/phandle
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+  - nand-ecc-engine
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/clock/mt7622-clk.h>
+    soc {
+      #address-cells = <2>;
+      #size-cells = <2>;
+      snfi: spi@...0d000 {
+        compatible = "mediatek,mt7622-snand";
+        reg = <0 0x1100d000 0 0x1000>;
+        interrupts = <GIC_SPI 96 IRQ_TYPE_LEVEL_LOW>;
+        clocks = <&pericfg CLK_PERI_NFI_PD>, <&pericfg CLK_PERI_SNFI_PD>;
+        clock-names = "nfi_clk", "pad_clk";
+        nand-ecc-engine = <&bch>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        flash@0 {
+          compatible = "spi-nand";
+          reg = <0>;
+          spi-tx-bus-width = <4>;
+          spi-rx-bus-width = <4>;
+          nand-ecc-engine = <&snfi>;
+        };
+      };
+    };
-- 
2.35.1