dts: spi: Add cypress PSoC-6 controller

Add Cypress PSoC-6 SPI controller and pinctrl nodes.

Signed-off-by: Gerson Fernando Budke <gerson.budke@atl-electronics.com>

dts/bindings/spi/cypress,psoc6-spi.yaml

@@ -0,0 +1,34 @@
+# Copyright (c) 2021, ATL Electronics
+# SPDX-License-Identifier: Apache-2.0
+
+description: Cypress SBC[SPI]
+
+compatible: "cypress,psoc6-spi"
+
+include: spi-controller.yaml
+
+properties:
+    reg:
+      required: true
+
+    interrupts:
+      required: true
+
+    peripheral-id:
+      type: int
+      description: peripheral ID
+      required: true
+
+    pinctrl-0:
+      type: phandles
+      description: |
+        Port pin configuration for the various SPI signals that includes
+        MISO, MOSI, SCK, and possibly various chip selects signals.  We
+        expect that the phandles will reference pinctrl nodes.  These
+        nodes will have a nodelabel that matches the Cypress SoC HAL defines
+        and be of the form p<port>_<pin>_<periph><inst>_<signal>.
+
+        For example the SPI on PSoC-63 Pioneer Kit would be
+           pinctrl-0 = <&p12_0_spi6_mosi &p12_1_spi6_miso &p12_2_spi6_clk &p12_3_spi6_sel0>;
+
+      required: true