dt-bindings: nfc: st,st21nfca: convert to dtschema

Convert the ST ST21NFCA NFC controller to DT schema format.

Changes during bindings conversion:
1. Add a new required "interrupts" property, because it was missing in
   the old bindings by mistake.
2. Drop the "clock-frequency" property during conversion because it is a
   property of I2C bus controller, not I2C slave device.  It was also
   never used by the driver.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Link: https://lore.kernel.org/r/20211011073934.34340-5-krzysztof.kozlowski@canonical.com
Signed-off-by: Rob Herring <robh@kernel.org>

1 files changed, 64 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/net/nfc/st,st21nfca.yaml b/Documentation/devicetree/bindings/net/nfc/st,st21nfca.yaml
new file mode 100644
index 000000000000..4356eacde8aa
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/nfc/st,st21nfca.yaml
@@ -0,0 +1,64 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/nfc/st,st21nfca.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: STMicroelectronics SAS ST21NFCA NFC controller
+
+maintainers:
+  - Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
+
+properties:
+  compatible:
+    const: st,st21nfca-i2c
+
+  enable-gpios:
+    description: Output GPIO pin used for enabling/disabling the controller
+
+  ese-present:
+    type: boolean
+    description: |
+      Specifies that an ese is physically connected to the controller
+
+  interrupts:
+    maxItems: 1
+
+  reg:
+    maxItems: 1
+
+  uicc-present:
+    type: boolean
+    description: |
+      Specifies that the uicc swp signal can be physically connected to the
+      controller
+
+required:
+  - compatible
+  - enable-gpios
+  - interrupts
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        nfc@1 {
+            compatible = "st,st21nfca-i2c";
+            reg = <0x1>;
+
+            interrupt-parent = <&gpio5>;
+            interrupts = <2 IRQ_TYPE_LEVEL_LOW>;
+            enable-gpios = <&gpio5 29 GPIO_ACTIVE_HIGH>;
+
+            ese-present;
+            uicc-present;
+        };
+    };