dt-bindings: spi: Convert stm32 spi bindings to json-schema

Convert the STM32 spi binding to DT schema format using json-schema
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com>
CC: Erwan Leray <erwan.leray@st.com>
CC: Fabrice Gasnier <fabrice.gasnier@st.com>
CC: Amelie Delaunay <amelie.delaunay@st.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20191217090715.13334-1-benjamin.gaignard@st.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/spi/spi-stm32.txt

-STMicroelectronics STM32 SPI Controller
-
-The STM32 SPI controller is used to communicate with external devices using
-the Serial Peripheral Interface. It supports full-duplex, half-duplex and
-simplex synchronous serial communication with external devices. It supports
-from 4 to 32-bit data size. Although it can be configured as master or slave,
-only master is supported by the driver.
-
-Required properties:
-- compatible: Should be one of:
-  "st,stm32h7-spi"
-  "st,stm32f4-spi"
-- reg: Offset and length of the device's register set.
-- interrupts: Must contain the interrupt id.
-- clocks: Must contain an entry for spiclk (which feeds the internal clock
-	  generator).
-- #address-cells:  Number of cells required to define a chip select address.
-- #size-cells: Should be zero.
-
-Optional properties:
-- resets: Must contain the phandle to the reset controller.
-- A pinctrl state named "default" may be defined to set pins in mode of
-  operation for SPI transfer.
-- dmas: DMA specifiers for tx and rx dma. DMA fifo mode must be used. See the
-  STM32 DMA bindings, Documentation/devicetree/bindings/dma/stm32-dma.txt.
-- dma-names: DMA request names should include "tx" and "rx" if present.
-- cs-gpios: list of GPIO chip selects. See the SPI bus bindings,
-  Documentation/devicetree/bindings/spi/spi-bus.txt
-
-
-Child nodes represent devices on the SPI bus
-  See ../spi/spi-bus.txt
-
-Optional properties:
-- st,spi-midi-ns: Only for STM32H7, (Master Inter-Data Idleness) minimum time
-		  delay in nanoseconds inserted between two consecutive data
-		  frames.
-
-
-Example:
-	spi2: spi@40003800 {
-		#address-cells = <1>;
-		#size-cells = <0>;
-		compatible = "st,stm32h7-spi";
-		reg = <0x40003800 0x400>;
-		interrupts = <36>;
-		clocks = <&rcc SPI2_CK>;
-		resets = <&rcc 1166>;
-		dmas = <&dmamux1 0 39 0x400 0x01>,
-		       <&dmamux1 1 40 0x400 0x01>;
-		dma-names = "rx", "tx";
-		pinctrl-0 = <&spi2_pins_b>;
-		pinctrl-names = "default";
-		cs-gpios = <&gpioa 11 0>;
-
-		aardvark@0 {
-			compatible = "totalphase,aardvark";
-			reg = <0>;
-			spi-max-frequency = <4000000>;
-			st,spi-midi-ns = <4000>;
-		};
-	};

Documentation/devicetree/bindings/spi/st,stm32-spi.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/spi/st,stm32-spi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: STMicroelectronics STM32 SPI Controller bindings
+
+description: |
+  The STM32 SPI controller is used to communicate with external devices using
+  the Serial Peripheral Interface. It supports full-duplex, half-duplex and
+  simplex synchronous serial communication with external devices. It supports
+  from 4 to 32-bit data size.
+
+maintainers:
+  - Erwan Leray <erwan.leray@st.com>
+  - Fabrice Gasnier <fabrice.gasnier@st.com>
+
+allOf:
+  - $ref: "spi-controller.yaml#"
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: st,stm32f4-spi
+
+    then:
+      properties:
+        st,spi-midi-ns: false
+
+properties:
+  compatible:
+    enum:
+      - st,stm32f4-spi
+      - st,stm32h7-spi
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+  dmas:
+    description: |
+      DMA specifiers for tx and rx dma. DMA fifo mode must be used. See
+      the STM32 DMA bindings Documentation/devicetree/bindings/dma/stm32-dma.txt.
+    items:
+      - description: rx DMA channel
+      - description: tx DMA channel
+
+  dma-names:
+    items:
+      - const: rx
+      - const: tx
+
+patternProperties:
+  "^[a-zA-Z][a-zA-Z0-9,+\\-._]{0,63}@[0-9a-f]+$":
+    type: object
+    # SPI slave nodes must be children of the SPI master node and can
+    # contain the following properties.
+    properties:
+      st,spi-midi-ns:
+        description: |
+          Only for STM32H7, (Master Inter-Data Idleness) minimum time
+          delay in nanoseconds inserted between two consecutive data frames.
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - interrupts
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/clock/stm32mp1-clks.h>
+    #include <dt-bindings/reset/stm32mp1-resets.h>
+    spi@4000b000 {
+      #address-cells = <1>;
+      #size-cells = <0>;
+      compatible = "st,stm32h7-spi";
+      reg = <0x4000b000 0x400>;
+      interrupts = <GIC_SPI 36 IRQ_TYPE_LEVEL_HIGH>;
+      clocks = <&rcc SPI2_K>;
+      resets = <&rcc SPI2_R>;
+      dmas = <&dmamux1 0 39 0x400 0x05>,
+             <&dmamux1 1 40 0x400 0x05>;
+      dma-names = "rx", "tx";
+      cs-gpios = <&gpioa 11 0>;
+
+      aardvark@0 {
+        compatible = "totalphase,aardvark";
+        reg = <0>;
+        spi-max-frequency = <4000000>;
+        st,spi-midi-ns = <4000>;
+      };
+    };
+
+...