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Subject: [PATCH v3 2/7] dt-bindings: mfd: Add binding for Netronix embedded controller
Date:   Thu, 24 Sep 2020 21:24:50 +0200
Message-Id: <20200924192455.2484005-3-j.neuschaefer@gmx.net>
In-Reply-To: <20200924192455.2484005-1-j.neuschaefer@gmx.net>
References: <20200924192455.2484005-1-j.neuschaefer@gmx.net>
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Precedence: bulk

This EC is found in e-book readers of multiple brands (e.g. Kobo,
Tolino), and is typically implemented as a TI MSP430 microcontroller.

It controls different functions of the system, such as power on/off,
RTC, PWM for the backlight. The exact functionality provided can vary
between boards.

Signed-off-by: Jonathan Neusch=C3=A4fer <j.neuschaefer@gmx.net>
=2D--

v3:
- Remove binding in text form patch description again
- Add additionalProperties: false
- Remove interrupt-controller property from example
- Merge pwm/rtc nodes into main node

v2:
- https://lore.kernel.org/lkml/20200905133230.1014581-3-j.neuschaefer@gmx.=
net/
- Add the plaintext DT binding for comparison
=2D--
 .../bindings/mfd/netronix,ntxec.yaml          | 76 +++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/netronix,ntxec.y=
aml

diff --git a/Documentation/devicetree/bindings/mfd/netronix,ntxec.yaml b/D=
ocumentation/devicetree/bindings/mfd/netronix,ntxec.yaml
new file mode 100644
index 0000000000000..59a630025f52f
=2D-- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/netronix,ntxec.yaml
@@ -0,0 +1,76 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/netronix,ntxec.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Netronix Embedded Controller
+
+maintainers:
+  - Jonathan Neusch=C3=A4fer <j.neuschaefer@gmx.net>
+
+description: |
+  This EC is found in e-book readers of multiple brands (e.g. Kobo, Tolin=
o), and
+  is typically implemented as a TI MSP430 microcontroller.
+
+properties:
+  compatible:
+    const: netronix,ntxec
+
+  reg:
+    items:
+      - description: The I2C address of the EC
+
+  system-power-controller:
+    type: boolean
+    description: See Documentation/devicetree/bindings/power/power-contro=
ller.txt
+
+  interrupts:
+    minItems: 1
+    description:
+      The EC can signal interrupts via a GPIO line
+
+  "#pwm-cells":
+    const: 2
+    description: |
+      Number of cells in a PWM specifier.
+
+      The following PWM channels are supported:
+        - 0: The PWM channel controlled by registers 0xa1-0xa7
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    i2c {
+            #address-cells =3D <1>;
+            #size-cells =3D <0>;
+
+            ec: embedded-controller@43 {
+                    pinctrl-names =3D "default";
+                    pinctrl-0 =3D <&pinctrl_ntxec>;
+
+                    compatible =3D "netronix,ntxec";
+                    reg =3D <0x43>;
+                    system-power-controller;
+                    interrupt-parent =3D <&gpio4>;
+                    interrupts =3D <11 IRQ_TYPE_EDGE_FALLING>;
+                    #pwm-cells =3D <2>;
+            };
+    };
+
+    backlight {
+            compatible =3D "pwm-backlight";
+            pwms =3D <&ec 0 50000>;
+            power-supply =3D <&backlight_regulator>;
+    };
+
+    backlight_regulator: regulator-dummy {
+            compatible =3D "regulator-fixed";
+            regulator-name =3D "backlight";
+    };
=2D-
2.28.0