[PATCH 01/19] dt: nand: add cadence nand dt-bindings

[dinesh.maniyam at intel.com]

From: Dinesh Maniyam <dinesh.maniyam at intel.com>

The Cadence NAND is a configurable mtd raw block which
supports multiple options for chipsets, clocking and reset structure, and
feature list.

Signed-off-by: Dinesh Maniyam <dinesh.maniyam at intel.com>
---
 .../mtd/cadence,nand.yaml                     | 98 +++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100644 doc/device-tree-bindings/mtd/cadence,nand.yaml

diff --git a/doc/device-tree-bindings/mtd/cadence,nand.yaml b/doc/device-tree-bindings/mtd/cadence,nand.yaml
new file mode 100644
index 0000000000..11ce023ec6
--- /dev/null
+++ b/doc/device-tree-bindings/mtd/cadence,nand.yaml
@@ -0,0 +1,98 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mtd/cadence,nand.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Cadence NAND controller
+
+maintainers:
+  - Dinesh Maniyam <dinesh.maniyam at intel.com>
+
+properties:
+  compatible:
+    enum:
+      - cdns,nand
+
+  reg-names:
+    description: |
+      There are two register regions:
+        reg:  register interface
+        sdma: host data/command interface
+    items:
+      - const: reg
+      - const: sdma
+
+  reg:
+    minItems: 2
+    maxItems: 2
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    description: |
+      There is one controller core clock
+    maxItems: 1
+
+  resets:
+    description: |
+      There are two resets:
+        controller core reset
+        combo-phy register reset
+    minItems: 1
+    maxItems: 2
+
+  cdns,board-delay-ps:
+     description: |
+        Estimated Board delay. The value includes the total
+        round trip delay for the signals and is used for deciding on values
+        associated with data read capture. The example formula for SDR mode is
+        the following:
+        board delay = RE#PAD delay + PCB trace to device + PCB trace from device
+        + DQ PAD delay
+     enum:
+       - 4830
+
+patternProperties:
+  "^nand@[a-f0-9]$":
+    type: object
+    properties:
+      compatible:
+        const: cdns,nand
+
+      reg:
+        maxItems: 1
+
+      label:
+        maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - cdns,board-delay-ps
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    nand-controller at 60000000 {
+        compatible = "cdns,nand";
+        reg = <0x60000000 0x10000>, <0x80000000 0x1000>;
+        reg-names = "reg", "sdma";
+        #address-cells = <1>;
+        #size-cells = <0>;
+        clocks = <&clk>;
+        cdns,board-delay-ps = <4830>;
+        interrupts = <2 0>;
+        nand at 0 {
+            label = "nand-0";
+            reg = <0>;
+        };
+        nand at 1 {
+            label = "nand-1";
+            reg = <1>;
+        };
+    };
-- 
2.26.2