linux-kernel - [PATCH v2 1/3] dt-bindings: leds: Add bindings for the TLC5925 controller

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Message-ID: <20220603155332.112272-2-jjhiblot@traphandler.com>
Date:   Fri, 3 Jun 2022 17:53:30 +0200
From:   Jean-Jacques Hiblot <jjhiblot@...phandler.com>
To:     <pavel@....cz>, <krzk+dt@...nel.org>
CC:     <robh+dt@...nel.org>, <linux-leds@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Jean-Jacques Hiblot <jjhiblot@...phandler.com>
Subject: [PATCH v2 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/bindings/leds/ti,tlc5925.yaml  | 106 ++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/leds/ti,tlc5925.yaml

diff --git a/Documentation/devicetree/bindings/leds/ti,tlc5925.yaml b/Documentation/devicetree/bindings/leds/ti,tlc5925.yaml
new file mode 100644
index 000000000000..379ade094fd3
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/ti,tlc5925.yaml
@@ -0,0 +1,106 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/leds/ti,tlc5925.yaml#
+$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.
+
+$ref: /schemas/spi/spi-peripheral-props.yaml#
+
+properties:
+  compatible:
+    const: ti,tlc5925
+
+  shift-register-length:
+    minimum: 8
+    description: |
+      The length of the shift register. If several TLC5925 are chained,
+      shift_register_length should be set to 16 times the number of TLC5925.
+      The value must be a multiple of 8.
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+  output-enable-b-gpios:
+    description: |
+      Optional GPIO pins to enable/disable the parallel output. They describe
+      the GPIOs connected to the OE/ pin of the TLC5925s.
+
+patternProperties:
+  "@[0-9a-z]+$":
+    type: object
+    $ref: common.yaml#
+
+    description: |
+      LED pin number (must be lower than shift_register_length).
+      The furthest LED down the chain has the pin number 0.
+
+    properties:
+      reg:
+        minimum: 0
+
+    required:
+      - reg
+
+additionalProperties: true
+
+required:
+  - "#address-cells"
+  - "#size-cells"
+  - shift_register_length
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/leds/common.h>
+
+    spi0 {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        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@0 {
+                reg = <0>;
+                function = LED_FUNCTION_STATUS;
+                color = <LED_COLOR_ID_GREEN>;
+            };
+
+            led@4 {
+                reg = <4>;
+                function = LED_FUNCTION_STATUS;
+                color = <LED_COLOR_ID_RED>;
+            };
+
+            led@1f {
+                reg = <31>;
+                function = LED_FUNCTION_PANIC;
+                color = <LED_COLOR_ID_RED>;
+            };
+        };
+
+    };
-- 
2.25.1