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Date: Fri, 21 Jan 2022 15:01:50 +0100
From: Florian Eckert <fe@....tdt.de>
To: pavel@....cz, robh+dt@...nel.org, andy.shevchenko@...il.com
Cc: Eckert.Florian@...glemail.com, linux-kernel@...r.kernel.org,
linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
Rob Herring <robh@...nel.org>
Subject: [PATCH v4 2/2] dt: bindings: KTD20xx: Introduce the ktd20xx family of RGB drivers
Introduce the bindings for the Kinetic KTD2061/58/59/60RGB LED device
driver. The KTD20xx can control RGB LEDs individually. Because of the
hardware limitations, only 7 colors and the color black (off) can be set.
Signed-off-by: Florian Eckert <fe@....tdt.de>
Reviewed-by: Rob Herring <robh@...nel.org>
---
.../bindings/leds/leds-ktd20xx.yaml | 130 ++++++++++++++++++
MAINTAINERS | 1 +
2 files changed, 131 insertions(+)
create mode 100644 Documentation/devicetree/bindings/leds/leds-ktd20xx.yaml
diff --git a/Documentation/devicetree/bindings/leds/leds-ktd20xx.yaml b/Documentation/devicetree/bindings/leds/leds-ktd20xx.yaml
new file mode 100644
index 000000000000..c4e440cc6945
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/leds-ktd20xx.yaml
@@ -0,0 +1,130 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/leds/leds-ktd20xx.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: LED driver for KTD20xx RGB LED from Kinetic.
+
+maintainers:
+ - Florian Eckert <fe@....tdt.de>
+
+description: |
+ The KTD20XX is multi-channel, I2C LED driver. Into can control up to 12
+ LEDs per device. The RGB value can be set for each LED. Due to hardware
+ limitations, the full RGB range cannot be used. Only 7 colors and the
+ color black can be set (black means off).
+ R G B
+ 0 0 0 = Black (off)
+ 0 0 1 = Blue
+ 0 1 0 = Green
+ 0 1 1 = Cyan
+ 1 0 0 = Red
+ 1 0 1 = Magenta
+ 1 1 0 = Yellow
+ 1 1 1 = White
+
+properties:
+ compatible:
+ enum:
+ - kinetic,ktd20xx
+
+ reg:
+ maxItems: 1
+ description:
+ I2C slave address
+ ktd2061/58/59/60 0x68 0x69 0x6A 0x6B
+
+ '#address-cells':
+ const: 1
+
+ '#size-cells':
+ const: 0
+
+ 'kinetic,led-current':
+ $ref: /schemas/types.yaml#/definitions/uint8
+ description:
+ This value is a current setting for all LEDs connected to this device.
+ If this value is not set then the default value off 0x28 (5mA) is set.
+ This means all LEDs get 5mA. The max value is 24mA. We have the
+ following mapping in 125uA steps. We can set a maximum of 24mA.
+ 0000 0000 (0x00) = 0uA
+ 0000 0001 (0x01) = 125uA
+ .... ....
+ 0010 1000 (0x28) = 5mA
+ .... ....
+ 1100 0000 (0xC0) = 24mA
+ 1100 0001 (0xC1) = 24mA
+ .... ....
+ 1111 1111 (0xFF) = 24mA
+ minimum: 0
+ maximum: 255
+
+patternProperties:
+ '^multi-led@[0-9a-f]$':
+ type: object
+ allOf:
+ - $ref: leds-class-multicolor.yaml#
+ description:
+ This node represents one of the Multicolor LED. No subnodes need to
+ be added for subchannels since this controller only supports 1bit
+ RGB values. We could display seven different colors and the color
+ black which means off.
+
+ properties:
+ reg:
+ minimum: 0
+ maximum: 11
+ description:
+ This property identifies wired connection of the LED to this device.
+ 0x00 LEDA1
+ 0x01 LEDA2
+ 0x02 LEDA3
+ 0x03 LEDA4
+ 0x04 LEDB1
+ 0x05 LEDB2
+ 0x06 LEDB3
+ 0x07 LEDB4
+ 0x08 LEDC1
+ 0x09 LEDC2
+ 0x0A LEDC3
+ 0x0B LEDC4
+
+required:
+ - compatible
+ - reg
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/leds/common.h>
+
+ i2c {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ led-controller@14 {
+ compatible = "kinetic,ktd20xx";
+ reg = <0x68>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ kinetic,led-current = <0x28>; // Current for all LEDs is 5mA
+
+ multi-led@0 {
+ reg = <0x0>;
+ color = <LED_COLOR_ID_MULTI>;
+ function = LED_FUNCTION_CHARGING;
+ linux,default-trigger = "default-on";
+ };
+
+ multi-led@2 {
+ reg = <0x2>;
+ color = <LED_COLOR_ID_MULTI>;
+ function = LED_FUNCTION_STANDBY;
+ linux,default-trigger = "default-on";
+ };
+ };
+ };
+
+...
diff --git a/MAINTAINERS b/MAINTAINERS
index 04d68985d348..b56d8392119c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -10743,6 +10743,7 @@ KTD20XX LED CONTROLLER DRIVER
M: Florian Eckert <fe@....tdt.de>
L: linux-leds@...r.kernel.org
S: Maintained
+F: Documentation/devicetree/bindings/leds/leds-ktd20xx.yaml
F: drivers/leds/leds-ktd20xx.c
KTEST
--
2.20.1
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