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This LED controller has a driver under development which is currently being reviewed by the respective kernel maintainers. They are currently on v11 which is included here. The LED1202 is a 12-channel low quiescent current LED driver with: * Supply range from 2.6 V to 5 V * 20 mA current capability per channel * 1.8 V compatible I2C control interface * 8-bit analog dimming individual control * 12-bit local PWM resolution * 8 programmable patterns If the led node is present in the controller then the channel is set to active. The output current can be adjusted separately for each channel by 8-bit analog (current sink input) and 12-bit digital (PWM) dimming control. The LED1202 implements 12 low-side current generators with independent dimming control. Internal volatile memory allows the user to store up to 8 different patterns, each pattern is a particular output configuration in terms of PWM duty-cycle (on 4096 steps). Analog dimming (on 256 steps) is per channel but common to all patterns. Each device tree LED node will have a corresponding entry in /sys/class/leds with the label name. The brightness property corresponds to the per channel analog dimming, while the patterns[1-8] to the PWM dimming control. Signed-off-by: Manuel Fombuena <fombuena@outlook.com> Link: https://github.com/openwrt/openwrt/pull/17451 Signed-off-by: Robert Marko <robimarko@gmail.com>
182 lines
5.3 KiB
Diff
182 lines
5.3 KiB
Diff
From: Vicentiu Galanopulo <vicentiu.galanopulo@remote-tech.co.uk>
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To: Pavel Machek <pavel@ucw.cz>, Lee Jones <lee@kernel.org>,
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Rob Herring <robh@kernel.org>,
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Krzysztof Kozlowski <krzk+dt@kernel.org>,
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Conor Dooley <conor+dt@kernel.org>,
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Jonathan Corbet <corbet@lwn.net>,
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Vicentiu Galanopulo <vicentiu.galanopulo@remote-tech.co.uk>,
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linux-leds@vger.kernel.org, devicetree@vger.kernel.org,
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linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org
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Cc: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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Subject: [PATCH v11 2/3] dt-bindings: leds: Add LED1202 LED Controller
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Date: Wed, 18 Dec 2024 18:33:58 +0000 [thread overview]
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Message-ID: <20241218183401.41687-3-vicentiu.galanopulo@remote-tech.co.uk> (raw)
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In-Reply-To: <20241218183401.41687-1-vicentiu.galanopulo@remote-tech.co.uk>
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The LED1202 is a 12-channel low quiescent current LED driver with:
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* Supply range from 2.6 V to 5 V
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* 20 mA current capability per channel
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* 1.8 V compatible I2C control interface
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* 8-bit analog dimming individual control
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* 12-bit local PWM resolution
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* 8 programmable patterns
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If the led node is present in the controller then the channel is
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set to active.
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Signed-off-by: Vicentiu Galanopulo <vicentiu.galanopulo@remote-tech.co.uk>
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Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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---
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v1: https://lore.kernel.org/lkml/ZnCnnQfwuRueCIQ0@admins-Air/T/
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v2: https://lore.kernel.org/all/ZniNdGgKyUMV-hjq@admins-Air/T/
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v3: https://lore.kernel.org/all/ZniNdGgKyUMV-hjq@admins-Air/T/
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Changes in v4:
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- remove label property, use devm_led_classdev_register_ext instead
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Changes in v3:
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- remove active property
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Changes in v2:
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- renamed label to remove color from it
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- add color property for each node
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- add function and function-enumerator property for each node
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.../devicetree/bindings/leds/st,led1202.yaml | 132 ++++++++++++++++++
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1 file changed, 132 insertions(+)
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create mode 100644 Documentation/devicetree/bindings/leds/st,led1202.yaml
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--- /dev/null
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+++ b/Documentation/devicetree/bindings/leds/st,led1202.yaml
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@@ -0,0 +1,132 @@
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+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
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+%YAML 1.2
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+---
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+$id: http://devicetree.org/schemas/leds/st,led1202.yaml#
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+$schema: http://devicetree.org/meta-schemas/core.yaml#
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+
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+title: ST LED1202 LED controllers
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+
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+maintainers:
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+ - Vicentiu Galanopulo <vicentiu.galanopulo@remote-tech.co.uk>
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+
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+description: |
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+ The LED1202 is a 12-channel low quiescent current LED controller
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+ programmable via I2C; The output current can be adjusted separately
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+ for each channel by 8-bit analog and 12-bit digital dimming control.
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+ Datasheet available at
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+ https://www.st.com/en/power-management/led1202.html
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+
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+properties:
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+ compatible:
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+ const: st,led1202
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+
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+ reg:
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+ maxItems: 1
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+
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+ "#address-cells":
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+ const: 1
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+
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+ "#size-cells":
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+ const: 0
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+
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+patternProperties:
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+ "^led@[0-9a-f]$":
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+ type: object
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+ $ref: common.yaml#
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+ unevaluatedProperties: false
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+
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+ properties:
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+ reg:
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+ minimum: 0
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+ maximum: 11
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+
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+ required:
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+ - reg
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+
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+required:
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+ - compatible
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+ - reg
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+ - "#address-cells"
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+ - "#size-cells"
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+
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+additionalProperties: false
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+
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+examples:
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+ - |
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+ #include <dt-bindings/leds/common.h>
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+
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+ i2c {
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+
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+ led-controller@58 {
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+ compatible = "st,led1202";
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+ reg = <0x58>;
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+
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+ led@0 {
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+ reg = <0x0>;
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+ function = LED_FUNCTION_STATUS;
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+ color = <LED_COLOR_ID_RED>;
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+ function-enumerator = <1>;
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+ };
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+
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+ led@1 {
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+ reg = <0x1>;
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+ function = LED_FUNCTION_STATUS;
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+ color = <LED_COLOR_ID_GREEN>;
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+ function-enumerator = <2>;
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+ };
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+
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+ led@2 {
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+ reg = <0x2>;
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+ function = LED_FUNCTION_STATUS;
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+ color = <LED_COLOR_ID_BLUE>;
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+ function-enumerator = <3>;
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+ };
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+
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+ led@3 {
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+ reg = <0x3>;
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+ function = LED_FUNCTION_STATUS;
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+ color = <LED_COLOR_ID_RED>;
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+ function-enumerator = <4>;
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+ };
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+
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+ led@4 {
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+ reg = <0x4>;
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+ function = LED_FUNCTION_STATUS;
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+ color = <LED_COLOR_ID_GREEN>;
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+ function-enumerator = <5>;
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+ };
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+
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+ led@5 {
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+ reg = <0x5>;
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+ function = LED_FUNCTION_STATUS;
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+ color = <LED_COLOR_ID_BLUE>;
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+ function-enumerator = <6>;
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+ };
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+
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+ led@6 {
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+ reg = <0x6>;
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+ function = LED_FUNCTION_STATUS;
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+ color = <LED_COLOR_ID_RED>;
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+ function-enumerator = <7>;
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+ };
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+
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+ led@7 {
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+ reg = <0x7>;
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+ function = LED_FUNCTION_STATUS;
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+ color = <LED_COLOR_ID_GREEN>;
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+ function-enumerator = <8>;
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+ };
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+
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+ led@8 {
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+ reg = <0x8>;
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+ function = LED_FUNCTION_STATUS;
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+ color = <LED_COLOR_ID_BLUE>;
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+ function-enumerator = <9>;
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+ };
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+ };
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+ };
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+...
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