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Subject[RFC PATCH 05/10] dt-bindings: pwm: Add bindings for PWM function in Netronix EC
Date
The Netronix embedded controller as found in Kobo Aura and Tolino Shine
supports one PWM channel, which is used to control the frontlight
brightness on these devices.

Known problems:
- `make dt_binding_check` shows the following warnings:
Documentation/devicetree/bindings/mfd/netronix,ntxec.example.dts:49.17-42:
Warning (pwms_property): /example-0/backlight:pwms: cell 2 is not a
phandle reference
Documentation/devicetree/bindings/mfd/netronix,ntxec.example.dts:49.17-42:
Warning (pwms_property): /example-0/backlight:pwms: Could not get
phandle node for (cell 2)

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
---
.../bindings/mfd/netronix,ntxec.yaml | 13 ++++++++
.../bindings/pwm/netronix,ntxec-pwm.yaml | 33 +++++++++++++++++++
2 files changed, 46 insertions(+)
create mode 100644 Documentation/devicetree/bindings/pwm/netronix,ntxec-pwm.yaml

diff --git a/Documentation/devicetree/bindings/mfd/netronix,ntxec.yaml b/Documentation/devicetree/bindings/mfd/netronix,ntxec.yaml
index 596df460f98eb..6562c41c5a9a9 100644
--- a/Documentation/devicetree/bindings/mfd/netronix,ntxec.yaml
+++ b/Documentation/devicetree/bindings/mfd/netronix,ntxec.yaml
@@ -31,6 +31,9 @@ properties:
description:
The EC can signal interrupts via a GPIO line

+ pwm:
+ $ref: ../pwm/netronix,ntxec-pwm.yaml
+
required:
- compatible
- reg
@@ -53,5 +56,15 @@ examples:
interrupts = <11 IRQ_TYPE_EDGE_FALLING>;
interrupt-controller;
#interrupt-cells = <1>;
+
+ ec_pwm: pwm {
+ compatible = "netronix,ntxec-pwm";
+ #pwm-cells = <1>;
+ };
};
};
+
+ backlight {
+ compatible = "pwm-backlight";
+ pwms = <&ec_pwm 0 50000>;
+ };
diff --git a/Documentation/devicetree/bindings/pwm/netronix,ntxec-pwm.yaml b/Documentation/devicetree/bindings/pwm/netronix,ntxec-pwm.yaml
new file mode 100644
index 0000000000000..1dc1b1aba081c
--- /dev/null
+++ b/Documentation/devicetree/bindings/pwm/netronix,ntxec-pwm.yaml
@@ -0,0 +1,33 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pwm/netronix,ntxec-pwm.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: PWM functionality in Netronix embedded controller
+
+maintainers:
+ - Jonathan Neuschäfer <j.neuschaefer@gmx.net>
+
+description: |
+ See also Documentation/devicetree/bindings/mfd/netronix,ntxec.yaml
+
+ The Netronix EC contains PWM functionality, which is usually used to drive
+ the backlight LED.
+
+ The following PWM channels are supported:
+ - 0: The PWM channel controlled by registers 0xa1-0xa7
+
+allOf:
+ - $ref: pwm.yaml#
+
+properties:
+ compatible:
+ const: netronix,ntxec-pwm
+
+ "#pwm-cells":
+ const: 1
+
+required:
+ - compatible
+ - "#pwm-cells"
--
2.27.0
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