[PATCH v8 3/3] dt-bindings: mtd: marvell-nand: Convert to YAML DT scheme

[Chris Packham <chris.packham@alliedtelesis.co.nz>]

From: Vadym Kochan <vadym.kochan@plvision.eu>

Switch the DT binding to a YAML schema to enable the DT validation.

The text binding didn't mention it as a requirement but existing usage
has

   compatible = "marvell,armada-8k-nand-controller",
                "marvell,armada370-nand-controller";

so the YAML allows this in addition to the individual compatible values.

There was also an incorrect reference to dma-names being "rxtx" where
the driver and existing device trees actually use dma-names = "data" so
this is corrected in the conversion.

Signed-off-by: Vadym Kochan <vadym.kochan@plvision.eu>
Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
---

Notes:
    Changes in v8:
    - Mark deprecated compatible values as such
    - Allow "marvell,armada-8k-nand-controller" without
      "marvell,armada370-nand-controller"
    - Make dma-names usage reflect reality
    - Update commit message
    
    Changes in v7:
    - Restore "label" and "partitions" properties (should be picked up via
      nand-controller.yaml but aren't)
    - Add/restore nand-on-flash-bbt and nand-ecc-mode which aren't covered
      by nand-controller.yaml.
    - Use "unevalautedProperties: false"
    - Corrections for clock-names, dma-names, nand-rb and nand-ecc-strength
    - Add pxa3xx-nand-controller example
    
    Changes in v6:
    - remove properties covered by nand-controller.yaml
    - add example using armada-8k compatible
    
    earlier changes:
    
    v5:
       1) Get back "label" and "partitions" properties but without
          ref to the "partition.yaml" which was wrongly used.
    
       2) Add "additionalProperties: false" for nand@ because all possible
          properties are described.
    
    v4:
       1) Remove "label" and "partitions" properties
    
       2) Use 2 clocks for A7K/8K platform which is a requirement
    
    v3:
      1) Remove txt version from the MAINTAINERS list
    
      2) Use enum for some of compatible strings
    
      3) Drop:
            #address-cells
            #size-cells:
    
         as they are inherited from the nand-controller.yaml
    
      4) Add restriction to use 2 clocks for A8K SoC
    
      5) Dropped description for clock-names and extend it with
         minItems: 1
    
      6) Drop description for "dmas"
    
      7) Use "unevalautedProperties: false"
    
      8) Drop quites from yaml refs.
    
      9) Use 4-space indentation for the example section
    
    v2:
      1) Fixed warning by yamllint with incorrect indentation for compatible list

 .../bindings/mtd/marvell,nand-controller.yaml | 223 ++++++++++++++++++
 .../devicetree/bindings/mtd/marvell-nand.txt  | 126 ----------
 MAINTAINERS                                   |   1 -
 3 files changed, 223 insertions(+), 127 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/mtd/marvell,nand-controller.yaml
 delete mode 100644 Documentation/devicetree/bindings/mtd/marvell-nand.txt

diff --git a/Documentation/devicetree/bindings/mtd/marvell,nand-controller.yaml b/Documentation/devicetree/bindings/mtd/marvell,nand-controller.yaml
new file mode 100644
index 000000000000..433feb430555
--- /dev/null
+++ b/Documentation/devicetree/bindings/mtd/marvell,nand-controller.yaml
@@ -0,0 +1,223 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mtd/marvell,nand-controller.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Marvell NAND Flash Controller (NFC)
+
+maintainers:
+  - Miquel Raynal <miquel.raynal@bootlin.com>
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - const: marvell,armada-8k-nand-controller
+          - const: marvell,armada370-nand-controller
+      - enum:
+          - marvell,armada-8k-nand-controller
+          - marvell,armada370-nand-controller
+          - marvell,pxa3xx-nand-controller
+      - description: legacy bindings
+        deprecated: true
+        enum:
+          - marvell,armada-8k-nand
+          - marvell,armada370-nand
+          - marvell,pxa3xx-nand
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    description:
+      Shall reference the NAND controller clocks, the second one is
+      is only needed for the Armada 7K/8K SoCs
+    minItems: 1
+    maxItems: 2
+
+  clock-names:
+    minItems: 1
+    items:
+      - const: core
+      - const: reg
+
+  dmas:
+    maxItems: 1
+
+  dma-names:
+    items:
+      - const: data
+
+  marvell,system-controller:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description: Syscon node that handles NAND controller related registers
+
+patternProperties:
+  "^nand@[0-3]$":
+    type: object
+    unevaluatedProperties: false
+    properties:
+      reg:
+        minimum: 0
+        maximum: 3
+
+      nand-rb:
+        minItems: 1
+        maxItems: 1
+
+      nand-ecc-step-size:
+        const: 512
+
+      nand-ecc-strength:
+        enum: [1, 4, 8, 12, 16]
+
+      nand-on-flash-bbt:
+        $ref: /schemas/types.yaml#/definitions/flag
+
+      nand-ecc-mode:
+        const: hw
+
+      label:
+        $ref: /schemas/types.yaml#/definitions/string
+
+      partitions:
+        type: object
+
+      marvell,nand-keep-config:
+        description: |
+          Orders the driver not to take the timings from the core and
+          leaving them completely untouched. Bootloader timings will then
+          be used.
+        $ref: /schemas/types.yaml#/definitions/flag
+
+      marvell,nand-enable-arbiter:
+        description: |
+          To enable the arbiter, all boards blindly used it,
+          this bit was set by the bootloader for many boards and even if
+          it is marked reserved in several datasheets, it might be needed to set
+          it (otherwise it is harmless).
+        $ref: /schemas/types.yaml#/definitions/flag
+        deprecated: true
+
+    additionalProperties: false
+
+    required:
+      - reg
+      - nand-rb
+
+allOf:
+  - $ref: nand-controller.yaml
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: marvell,pxa3xx-nand-controller
+    then:
+      required:
+        - dmas
+        - dma-names
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: marvell,armada-8k-nand-controller
+    then:
+      properties:
+        clocks:
+          minItems: 2
+
+        clock-names:
+          minItems: 2
+
+      required:
+        - marvell,system-controller
+
+unevaluatedProperties: false
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    nand_controller: nand-controller@d0000 {
+        compatible = "marvell,armada370-nand-controller";
+        reg = <0xd0000 0x54>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+        interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&coredivclk 0>;
+
+        nand@0 {
+            reg = <0>;
+            label = "main-storage";
+            nand-rb = <0>;
+            nand-ecc-mode = "hw";
+            marvell,nand-keep-config;
+            nand-on-flash-bbt;
+            nand-ecc-strength = <4>;
+            nand-ecc-step-size = <512>;
+
+            partitions {
+                compatible = "fixed-partitions";
+                #address-cells = <1>;
+                #size-cells = <1>;
+
+                partition@0 {
+                    label = "Rootfs";
+                    reg = <0x00000000 0x40000000>;
+                };
+            };
+        };
+    };
+
+  - |
+    cp0_nand_controller: nand-controller@720000 {
+        compatible = "marvell,armada-8k-nand-controller",
+                "marvell,armada370-nand-controller";
+        reg = <0x720000 0x54>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+        interrupts = <115 IRQ_TYPE_LEVEL_HIGH>;
+        clock-names = "core", "reg";
+        clocks = <&cp0_clk 1 2>,
+                 <&cp0_clk 1 17>;
+        marvell,system-controller = <&cp0_syscon0>;
+
+        nand@0 {
+            reg = <0>;
+            label = "main-storage";
+            nand-rb = <0>;
+            nand-ecc-mode = "hw";
+            nand-ecc-strength = <8>;
+            nand-ecc-step-size = <512>;
+        };
+    };
+
+  - |
+    nand-controller@43100000 {
+        compatible = "marvell,pxa3xx-nand-controller";
+        reg = <0x43100000 90>;
+        interrupts = <45>;
+        clocks = <&clks 1>;
+        clock-names = "core";
+        dmas = <&pdma 97 3>;
+        dma-names = "data";
+        #address-cells = <1>;
+        #size-cells = <0>;
+        nand@0 {
+            reg = <0>;
+            nand-rb = <0>;
+            nand-ecc-mode = "hw";
+            marvell,nand-keep-config;
+        };
+    };
diff --git a/Documentation/devicetree/bindings/mtd/marvell-nand.txt b/Documentation/devicetree/bindings/mtd/marvell-nand.txt
deleted file mode 100644
index a2d9a0f2b683..000000000000
--- a/Documentation/devicetree/bindings/mtd/marvell-nand.txt
+++ /dev/null
@@ -1,126 +0,0 @@
-Marvell NAND Flash Controller (NFC)
-
-Required properties:
-- compatible: can be one of the following:
-    * "marvell,armada-8k-nand-controller"
-    * "marvell,armada370-nand-controller"
-    * "marvell,pxa3xx-nand-controller"
-    * "marvell,armada-8k-nand" (deprecated)
-    * "marvell,armada370-nand" (deprecated)
-    * "marvell,pxa3xx-nand" (deprecated)
-  Compatibles marked deprecated support only the old bindings described
-  at the bottom.
-- reg: NAND flash controller memory area.
-- #address-cells: shall be set to 1. Encode the NAND CS.
-- #size-cells: shall be set to 0.
-- interrupts: shall define the NAND controller interrupt.
-- clocks: shall reference the NAND controller clocks, the second one is
-  is only needed for the Armada 7K/8K SoCs
-- clock-names: mandatory if there is a second clock, in this case there
-  should be one clock named "core" and another one named "reg"
-- marvell,system-controller: Set to retrieve the syscon node that handles
-  NAND controller related registers (only required with the
-  "marvell,armada-8k-nand[-controller]" compatibles).
-
-Optional properties:
-- label: see partition.txt. New platforms shall omit this property.
-- dmas: shall reference DMA channel associated to the NAND controller.
-  This property is only used with "marvell,pxa3xx-nand[-controller]"
-  compatible strings.
-- dma-names: shall be "rxtx".
-  This property is only used with "marvell,pxa3xx-nand[-controller]"
-  compatible strings.
-
-Optional children nodes:
-Children nodes represent the available NAND chips.
-
-Required properties:
-- reg: shall contain the native Chip Select ids (0-3).
-- nand-rb: see nand-controller.yaml (0-1).
-
-Optional properties:
-- marvell,nand-keep-config: orders the driver not to take the timings
-  from the core and leaving them completely untouched. Bootloader
-  timings will then be used.
-- label: MTD name.
-- nand-on-flash-bbt: see nand-controller.yaml.
-- nand-ecc-mode: see nand-controller.yaml. Will use hardware ECC if not specified.
-- nand-ecc-algo: see nand-controller.yaml. This property is essentially useful when
-  not using hardware ECC. Howerver, it may be added when using hardware
-  ECC for clarification but will be ignored by the driver because ECC
-  mode is chosen depending on the page size and the strength required by
-  the NAND chip. This value may be overwritten with nand-ecc-strength
-  property.
-- nand-ecc-strength: see nand-controller.yaml.
-- nand-ecc-step-size: see nand-controller.yaml. Marvell's NAND flash controller does
-  use fixed strength (1-bit for Hamming, 16-bit for BCH), so the actual
-  step size will shrink or grow in order to fit the required strength.
-  Step sizes are not completely random for all and follow certain
-  patterns described in AN-379, "Marvell SoC NFC ECC".
-
-See Documentation/devicetree/bindings/mtd/nand-controller.yaml for more details on
-generic bindings.
-
-
-Example:
-nand_controller: nand-controller@d0000 {
-	compatible = "marvell,armada370-nand-controller";
-	reg = <0xd0000 0x54>;
-	#address-cells = <1>;
-	#size-cells = <0>;
-	interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
-	clocks = <&coredivclk 0>;
-
-	nand@0 {
-		reg = <0>;
-		label = "main-storage";
-		nand-rb = <0>;
-		nand-ecc-mode = "hw";
-		marvell,nand-keep-config;
-		nand-on-flash-bbt;
-		nand-ecc-strength = <4>;
-		nand-ecc-step-size = <512>;
-
-		partitions {
-			compatible = "fixed-partitions";
-			#address-cells = <1>;
-			#size-cells = <1>;
-
-			partition@0 {
-				label = "Rootfs";
-				reg = <0x00000000 0x40000000>;
-			};
-		};
-	};
-};
-
-
-Note on legacy bindings: One can find, in not-updated device trees,
-bindings slightly different than described above with other properties
-described below as well as the partitions node at the root of a so
-called "nand" node (without clear controller/chip separation).
-
-Legacy properties:
-- marvell,nand-enable-arbiter: To enable the arbiter, all boards blindly
-  used it, this bit was set by the bootloader for many boards and even if
-  it is marked reserved in several datasheets, it might be needed to set
-  it (otherwise it is harmless) so whether or not this property is set,
-  the bit is selected by the driver.
-- num-cs: Number of chip-select lines to use, all boards blindly set 1
-  to this and for a reason, other values would have failed. The value of
-  this property is ignored.
-
-Example:
-
-	nand0: nand@43100000 {
-		compatible = "marvell,pxa3xx-nand";
-		reg = <0x43100000 90>;
-		interrupts = <45>;
-		dmas = <&pdma 97 0>;
-		dma-names = "rxtx";
-		#address-cells = <1>;
-		marvell,nand-keep-config;
-		marvell,nand-enable-arbiter;
-		num-cs = <1>;
-		/* Partitions (optional) */
-       };
diff --git a/MAINTAINERS b/MAINTAINERS
index 2a42a75c304c..fdd2027529ea 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -12535,7 +12535,6 @@ MARVELL NAND CONTROLLER DRIVER
 M:	Miquel Raynal <miquel.raynal@bootlin.com>
 L:	linux-mtd@lists.infradead.org
 S:	Maintained
-F:	Documentation/devicetree/bindings/mtd/marvell-nand.txt
 F:	drivers/mtd/nand/raw/marvell_nand.c
 
 MARVELL OCTEON ENDPOINT DRIVER
-- 
2.40.1