[PATCH 1/5] spi: dt-bindings: add binding doc for spi-qpic-snand

[Md Sadre Alam <quic_mdalam@xxxxxxxxxxx>]

Add device-tree binding documentation for QCOM QPIC-SNAND-NAND Flash
Interface.

Co-developed-by: Sricharan Ramabadhran <quic_srichara@xxxxxxxxxxx>
Signed-off-by: Sricharan Ramabadhran <quic_srichara@xxxxxxxxxxx>
Co-developed-by: Varadarajan Narayanan <quic_varada@xxxxxxxxxxx>
Signed-off-by: Varadarajan Narayanan <quic_varada@xxxxxxxxxxx>
Signed-off-by: Md Sadre Alam <quic_mdalam@xxxxxxxxxxx>
---
 .../bindings/spi/qcom,spi-qpic-snand.yaml     | 82 +++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/spi/qcom,spi-qpic-snand.yaml

diff --git a/Documentation/devicetree/bindings/spi/qcom,spi-qpic-snand.yaml b/Documentation/devicetree/bindings/spi/qcom,spi-qpic-snand.yaml
new file mode 100644
index 000000000000..fa7484ce1319
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/qcom,spi-qpic-snand.yaml
@@ -0,0 +1,82 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/spi/qcom,spi-qpic-snand.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm QPIC NAND controller
+
+maintainers:
+  - Md sadre Alam <quic_mdalam@xxxxxxxxxxx>
+
+properties:
+  compatible:
+    enum:
+      - qcom,ipq9574-snand
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    minItems: 2
+    maxItems: 3
+
+  clock-names:
+    minItems: 2
+    maxItems: 3
+
+allOf:
+  - $ref: /schemas/spi/spi-controller.yaml#
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - qcom,ipq9574-snand
+
+    then:
+      properties:
+        dmas:
+          items:
+            - description: tx DMA channel
+            - description: rx DMA channel
+            - description: cmd DMA channel
+
+        dma-names:
+          items:
+            - const: tx
+            - const: rx
+            - const: cmd
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/qcom,ipq9574-gcc.h>
+    qpic_nand: spi@79b0000 {
+        compatible = "qcom,ipq9574-snand";
+        reg = <0x1ac00000 0x800>;
+
+        clocks = <&gcc GCC_QPIC_CLK>,
+                 <&gcc GCC_QPIC_AHB_CLK>,
+                 <&gcc GCC_QPIC_IO_MACRO_CLK>;
+        clock-names = "core", "aon", "iom";
+
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        flash@0 {
+            compatible = "spi-nand";
+            reg = <0>;
+            #address-cells = <1>;
+            #size-cells = <1>;
+            nand-ecc-engine = <&qpic_nand>;
+            nand-ecc-strength = <4>;
+            nand-ecc-step-size = <512>;
+            };
+        };
-- 
2.34.1