[Patch v2] dt-bindings: spi: Convert NXP flexspi to json schema

[Kuldeep Singh <kuldeep.singh@nxp.com>]

Convert the NXP FlexSPI binding to DT schema format using json-schema.

Signed-off-by: Kuldeep Singh <kuldeep.singh@nxp.com>
Reviewed-by: Rob Herring <robh@kernel.org>
---
Hi Rob,
This patch update description of reg-names and clocks for easy
understanding. Apart from that there's no other functional change,
that's why I didn't remove your reviewed-by tag.
I have compiled and checked the bindings with dt_binding_check and
dtbs_check and found 1 warning for which I have sent fix and has been
applied by Shawn.
https://lore.kernel.org/all/20210908065126.1273140-1-kuldeep.singh@nxp.com/

v2:
- Update description of reg-names and clocks. No other change
- Rename file to spi-nxp-fspi.yaml to align with other spi-*.yaml files
- Rebase to top of tree
v1:
- https://lore.kernel.org/all/20210428102417.1936520-1-kuldeep.singh@nxp.com/

 .../devicetree/bindings/spi/spi-nxp-fspi.txt  | 44 ----------
 .../devicetree/bindings/spi/spi-nxp-fspi.yaml | 86 +++++++++++++++++++
 MAINTAINERS                                   |  2 +-
 3 files changed, 87 insertions(+), 45 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/spi/spi-nxp-fspi.txt
 create mode 100644 Documentation/devicetree/bindings/spi/spi-nxp-fspi.yaml

diff --git a/Documentation/devicetree/bindings/spi/spi-nxp-fspi.txt b/Documentation/devicetree/bindings/spi/spi-nxp-fspi.txt
deleted file mode 100644
index 8f34a7c7d8b8..000000000000
--- a/Documentation/devicetree/bindings/spi/spi-nxp-fspi.txt
+++ /dev/null
@@ -1,44 +0,0 @@
-* NXP Flex Serial Peripheral Interface (FSPI)
-
-Required properties:
-  - compatible : Should be "nxp,lx2160a-fspi"
-			    "nxp,imx8qxp-fspi"
-			    "nxp,imx8mm-fspi"
-			    "nxp,imx8mp-fspi"
-			    "nxp,imx8dxl-fspi"
-
-  - reg :        First contains the register location and length,
-                 Second contains the memory mapping address and length
-  - reg-names :  Should contain the resource reg names:
-	         - fspi_base: configuration register address space
-                 - fspi_mmap: memory mapped address space
-  - interrupts : Should contain the interrupt for the device
-
-Required SPI slave node properties:
-  - reg :        There are two buses (A and B) with two chip selects each.
-                 This encodes to which bus and CS the flash is connected:
-                 - <0>: Bus A, CS 0
-                 - <1>: Bus A, CS 1
-                 - <2>: Bus B, CS 0
-                 - <3>: Bus B, CS 1
-
-Example showing the usage of two SPI NOR slave devices on bus A:
-
-fspi0: spi@20c0000 {
-	compatible = "nxp,lx2160a-fspi";
-	reg = <0x0 0x20c0000 0x0 0x10000>, <0x0 0x20000000 0x0 0x10000000>;
-	reg-names = "fspi_base", "fspi_mmap";
-	interrupts = <0 25 0x4>; /* Level high type */
-	clocks = <&clockgen 4 3>, <&clockgen 4 3>;
-	clock-names = "fspi_en", "fspi";
-
-	mt35xu512aba0: flash@0 {
-		reg = <0>;
-		....
-	};
-
-	mt35xu512aba1: flash@1 {
-		reg = <1>;
-		....
-	};
-};
diff --git a/Documentation/devicetree/bindings/spi/spi-nxp-fspi.yaml b/Documentation/devicetree/bindings/spi/spi-nxp-fspi.yaml
new file mode 100644
index 000000000000..283815d59e85
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/spi-nxp-fspi.yaml
@@ -0,0 +1,86 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/spi/spi-nxp-fspi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP Flex Serial Peripheral Interface (FSPI)
+
+maintainers:
+  - Kuldeep Singh <kuldeep.singh@nxp.com>
+
+allOf:
+  - $ref: "spi-controller.yaml#"
+
+properties:
+  compatible:
+    enum:
+      - nxp,imx8dxl-fspi
+      - nxp,imx8mm-fspi
+      - nxp,imx8mp-fspi
+      - nxp,imx8qxp-fspi
+      - nxp,lx2160a-fspi
+
+  reg:
+    items:
+      - description: registers address space
+      - description: memory mapped address space
+
+  reg-names:
+    items:
+      - const: fspi_base
+      - const: fspi_mmap
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: SPI bus clock
+      - description: SPI serial clock
+
+  clock-names:
+    items:
+      - const: fspi_en
+      - const: fspi
+
+required:
+  - compatible
+  - reg
+  - reg-names
+  - interrupts
+  - clocks
+  - clock-names
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/clock/fsl,qoriq-clockgen.h>
+
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        spi@20c0000 {
+            compatible = "nxp,lx2160a-fspi";
+            reg = <0x0 0x20c0000 0x0 0x100000>,
+                  <0x0 0x20000000 0x0 0x10000000>;
+            reg-names = "fspi_base", "fspi_mmap";
+            interrupts = <GIC_SPI 25 IRQ_TYPE_LEVEL_HIGH>;
+            clocks = <&clockgen QORIQ_CLK_PLATFORM_PLL QORIQ_CLK_PLL_DIV(4)>,
+                     <&clockgen QORIQ_CLK_PLATFORM_PLL QORIQ_CLK_PLL_DIV(4)>;
+            clock-names = "fspi_en", "fspi";
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            flash@0 {
+                compatible = "jedec,spi-nor";
+                spi-max-frequency = <50000000>;
+                reg = <0>;
+                spi-rx-bus-width = <8>;
+                spi-tx-bus-width = <8>;
+            };
+        };
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index ca6d6fde85cf..e11d61ea67de 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -13437,7 +13437,7 @@ M:	Ashish Kumar <ashish.kumar@nxp.com>
 R:	Yogesh Gaur <yogeshgaur.83@gmail.com>
 L:	linux-spi@vger.kernel.org
 S:	Maintained
-F:	Documentation/devicetree/bindings/spi/spi-nxp-fspi.txt
+F:	Documentation/devicetree/bindings/spi/spi-nxp-fspi.yaml
 F:	drivers/spi/spi-nxp-fspi.c
 
 NXP FXAS21002C DRIVER
-- 
2.25.1