dt-bindings: spi: sprd,sc9860-spi: convert to YAML

Convert the Spreadtrum SC9860 SPI controller bindings to DT schema.
Adjust filename to match compatible.

Signed-off-by: Stanislav Jakubek <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Link: https://patch.msgid.link/ZyH2P3FlneLtGxXo@standask-GA-A55M-S2HP
Signed-off-by: Mark Brown <[e-mail]>

Documentation/devicetree/bindings/spi/spi-sprd.txt

···
-Spreadtrum SPI Controller
-
-Required properties:
-- compatible: Should be "sprd,sc9860-spi".
-- reg: Offset and length of SPI controller register space.
-- interrupts: Should contain SPI interrupt.
-- clock-names: Should contain following entries:
-	"spi" for SPI clock,
-	"source" for SPI source (parent) clock,
-	"enable" for SPI module enable clock.
-- clocks: List of clock input name strings sorted in the same order
-	as the clock-names property.
-- #address-cells: The number of cells required to define a chip select
-	address on the SPI bus. Should be set to 1.
-- #size-cells: Should be set to 0.
-
-Optional properties:
-dma-names: Should contain names of the SPI used DMA channel.
-dmas: Should contain DMA channels and DMA slave ids which the SPI used
-	sorted in the same order as the dma-names property.
-
-Example:
-spi0: spi@70a00000{
-	compatible = "sprd,sc9860-spi";
-	reg = <0 0x70a00000 0 0x1000>;
-	interrupts = <GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>;
-	clock-names = "spi", "source","enable";
-	clocks = <&clk_spi0>, <&ext_26m>, <&clk_ap_apb_gates 5>;
-	dma-names = "rx_chn", "tx_chn";
-	dmas = <&apdma 11 11>, <&apdma 12 12>;
-	#address-cells = <1>;
-	#size-cells = <0>;
-};

Documentation/devicetree/bindings/spi/sprd,sc9860-spi.yaml

···
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/spi/sprd,sc9860-spi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Spreadtrum SC9860 SPI Controller
+
+maintainers:
+  - Orson Zhai <[e-mail]>
+  - Baolin Wang <[e-mail]>
+  - Chunyan Zhang <[e-mail]>
+
+properties:
+  compatible:
+    const: sprd,sc9860-spi
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: SPI clock
+      - description: SPI source (parent) clock
+      - description: SPI module enable clock
+
+  clock-names:
+    items:
+      - const: spi
+      - const: source
+      - const: enable
+
+  dmas:
+    maxItems: 2
+
+  dma-names:
+    items:
+      - const: rx_chn
+      - const: tx_chn
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+
+allOf:
+  - $ref: spi-controller.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    spi@70a00000 {
+      compatible = "sprd,sc9860-spi";
+      reg = <0x70a00000 0x1000>;
+      interrupts = <GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>;
+      clocks = <&clk_spi0>, <&ext_26m>, <&clk_ap_apb_gates 5>;
+      clock-names = "spi", "source", "enable";
+      dmas = <&apdma 11 11>, <&apdma 12 12>;
+      dma-names = "rx_chn", "tx_chn";
+      #address-cells = <1>;
+      #size-cells = <0>;
+    };
+...