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Message-ID: <20220523084958.2723943-2-jjhiblot@traphandler.com>
Date: Mon, 23 May 2022 10:49:55 +0200
From: Jean-Jacques Hiblot <jjhiblot@...phandler.com>
To: Pavel Machek <pavel@....cz>, Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Jean-Jacques Hiblot <jjhiblot@...phandler.com>
CC: <linux-leds@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
Subject: [PATCH 1/3] dt-bindings: leds: Add bindings for the TLC5925 controller
Add bindings documentation for the TLC5925 LED controller.
Signed-off-by: Jean-Jacques Hiblot <jjhiblot@...phandler.com>
---
devicetree@...r.kernel.org
.../bindings/leds/leds-tlc5925.yaml | 100 ++++++++++++++++++
1 file changed, 100 insertions(+)
create mode 100644 Documentation/devicetree/bindings/leds/leds-tlc5925.yaml
diff --git a/Documentation/devicetree/bindings/leds/leds-tlc5925.yaml b/Documentation/devicetree/bindings/leds/leds-tlc5925.yaml
new file mode 100644
index 000000000000..156db599d5a1
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/leds-tlc5925.yaml
@@ -0,0 +1,100 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/leds/leds-tlc5925.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: LEDs connected to TI TLC5925 controller
+
+maintainers:
+ - Jean-Jacques Hiblot <jjhiblot@...phandler.com>
+
+description: |
+ The TLC5925 is a low-power 16-channel constant-current LED sink driver.
+ It is controlled through a SPI interface.
+ It is built around a shift register and latches which convert serial
+ input data into a parallel output. Several TLC5925 can be chained to
+ control more than 16 LEDs with a single chip-select.
+ The brightness level cannot be controlled, each LED is either on or off.
+
+ Each LED is represented as a sub-node of the ti,tlc5925 device.
+
+properties:
+ compatible:
+ const: ti,tlc5925
+
+ shift_register_length:
+ maxItems: 1
+ description: |
+ The length of the shift register. If several TLC5925 are chained,
+ shift_register_length should be set to 16 times the number of TLC5925.
+ The value must be a multiple of 8.
+
+ "#address-cells":
+ const: 1
+
+ "#size-cells":
+ const: 0
+
+ output-enable-b-gpios:
+ description: |
+ GPIO pins to enable/disable the parallel output. They describe the GPIOs
+ connected to the OE/ pin of the TLC5925s.
+
+patternProperties:
+ "@[a-f0-9]+$":
+ type: object
+
+ $ref: common.yaml#
+
+ properties:
+ reg:
+ items:
+ description: |
+ LED pin number (must be lower than shift_register_length).
+ The furthest LED down the chain has the pin number 0.
+
+ required:
+ - reg
+
+required:
+ - reg
+ - "#address-cells"
+ - "#size-cells"
+ - shift_register_length
+
+examples:
+ - |
+ &spi0 {
+ leds@2 {
+ compatible = "ti,tlc5925";
+ reg = <0x02>;
+ spi-max-frequency = <30000000>;
+ shift_register_length = <32>;
+ output-enable-b-gpios = <&gpio0b 9 GPIO_ACTIVE_HIGH>, <&gpio0b 7 GPIO_ACTIVE_HIGH>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ led-satus@0 {
+ reg = <0>;
+ function = LED_FUNCTION_STATUS;
+ color = <LED_COLOR_ID_GREEN>;
+ };
+
+ led-satus@4 {
+ reg = <4>;
+ function = LED_FUNCTION_STATUS;
+ color = <LED_COLOR_ID_RED>;
+ };
+
+ led-alive@24 {
+ reg = <24>;
+ label = "green:alive"
+ };
+
+ led-panic@31 {
+ reg = <31>;
+ label = "red:panic"
+ };
+ };
+ };
--
2.25.1
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