[PATCH v2] spi: atmel: convert spi_atmel to json-schema

[Sergiu Moga <sergiu.moga@microchip.com>]

Convert SPI DT binding for Atmel/Microchip SoCs to YAML schema.

Signed-off-by: Sergiu Moga <sergiu.moga@microchip.com>
---

v1 -> v2:
- change subject headline prefix from "dt-bindings: spi" to "spi: atmel"
- change maintainer
- kept the compatbile as items (instead of switching to enums) and at91rm9200
as fallback for sam9x60, since the evolution of IP's is incremental.
- removed unnecessay "cs-gpios" property and descriptions
- added min/max for fifo-size property.


 .../devicetree/bindings/spi/atmel,spi.yaml    | 77 +++++++++++++++++++
 .../devicetree/bindings/spi/spi_atmel.txt     | 36 ---------
 2 files changed, 77 insertions(+), 36 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/spi/atmel,spi.yaml
 delete mode 100644 Documentation/devicetree/bindings/spi/spi_atmel.txt

diff --git a/Documentation/devicetree/bindings/spi/atmel,spi.yaml b/Documentation/devicetree/bindings/spi/atmel,spi.yaml
new file mode 100644
index 000000000000..d627fc9315bc
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/atmel,spi.yaml
@@ -0,0 +1,77 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright (C) 2022 Microchip Technology, Inc. and its subsidiaries
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/spi/atmel,spi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Atmel SPI device
+
+maintainers:
+  - Tudor Ambarus <tudor.ambarus@microchip.com>
+
+allOf:
+  - $ref: spi-controller.yaml#
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - const: atmel,at91rm9200-spi
+      - items:
+          - const: microchip,sam9x60-spi
+          - const: atmel,at91rm9200-spi
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clock-names:
+    contains:
+      const: spi_clk
+
+  clocks:
+    maxItems: 1
+
+  atmel,fifo-size:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: |
+      Maximum number of data the RX and TX FIFOs can store for FIFO
+      capable SPI controllers.
+    minimum: 16
+    maximum: 32
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clock-names
+  - clocks
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    spi1: spi@fffcc000 {
+        compatible = "atmel,at91rm9200-spi";
+        reg = <0xfffcc000 0x4000>;
+        interrupts = <13 IRQ_TYPE_LEVEL_HIGH 5>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+        clocks = <&spi1_clk>;
+        clock-names = "spi_clk";
+        cs-gpios = <&pioB 3 GPIO_ACTIVE_HIGH>;
+        atmel,fifo-size = <32>;
+
+        mmc@0 {
+            compatible = "mmc-spi-slot";
+            reg = <0>;
+            gpios = <&pioC 4 GPIO_ACTIVE_HIGH>;    /* CD */
+            spi-max-frequency = <25000000>;
+        };
+    };
diff --git a/Documentation/devicetree/bindings/spi/spi_atmel.txt b/Documentation/devicetree/bindings/spi/spi_atmel.txt
deleted file mode 100644
index 5bb4a8f1df7a..000000000000
--- a/Documentation/devicetree/bindings/spi/spi_atmel.txt
+++ /dev/null
@@ -1,36 +0,0 @@
-Atmel SPI device
-
-Required properties:
-- compatible : should be "atmel,at91rm9200-spi" or "microchip,sam9x60-spi".
-- reg: Address and length of the register set for the device
-- interrupts: Should contain spi interrupt
-- cs-gpios: chipselects (optional for SPI controller version >= 2 with the
-  Chip Select Active After Transfer feature).
-- clock-names: tuple listing input clock names.
-	Required elements: "spi_clk"
-- clocks: phandles to input clocks.
-
-Optional properties:
-- atmel,fifo-size: maximum number of data the RX and TX FIFOs can store for FIFO
-  capable SPI controllers.
-
-Example:
-
-spi1: spi@fffcc000 {
-	compatible = "atmel,at91rm9200-spi";
-	reg = <0xfffcc000 0x4000>;
-	interrupts = <13 4 5>;
-	#address-cells = <1>;
-	#size-cells = <0>;
-	clocks = <&spi1_clk>;
-	clock-names = "spi_clk";
-	cs-gpios = <&pioB 3 0>;
-	atmel,fifo-size = <32>;
-
-	mmc-slot@0 {
-		compatible = "mmc-spi-slot";
-		reg = <0>;
-		gpios = <&pioC 4 0>;	/* CD */
-		spi-max-frequency = <25000000>;
-	};
-};
-- 
2.25.1