[PATCH v4 2/6] dt-bindings: auxdisplay: add Titan Micro Electronics TM16xx

["Jean-François Lessard" <jefflessard3@gmail.com>]

Add documentation for TM16xx-compatible 7-segment LED display controllers
with keyscan.

Signed-off-by: Jean-François Lessard <jefflessard3@gmail.com>
---

Notes:
    The 'segments' property is intentionally not vendor-prefixed as it
    defines a generic hardware description concept applicable to any
    7-segment display controller. The property describes the fundamental
    grid/segment coordinate mapping that is controller-agnostic and could
    be reused by other LED matrix display bindings. Similar to how 'gpios'
    describes GPIO connections generically, 'segments' describes segment
    connections in a standardized way using uint32-matrix format.

 .../bindings/auxdisplay/titanmec,tm16xx.yaml  | 477 ++++++++++++++++++
 MAINTAINERS                                   |   5 +
 2 files changed, 482 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/auxdisplay/titanmec,tm16xx.yaml

diff --git a/Documentation/devicetree/bindings/auxdisplay/titanmec,tm16xx.yaml b/Documentation/devicetree/bindings/auxdisplay/titanmec,tm16xx.yaml
new file mode 100644
index 000000000..c94556d95
--- /dev/null
+++ b/Documentation/devicetree/bindings/auxdisplay/titanmec,tm16xx.yaml
@@ -0,0 +1,477 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/auxdisplay/titanmec,tm16xx.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Auxiliary displays based on TM16xx and compatible LED controllers
+
+maintainers:
+  - Jean-François Lessard <jefflessard3@gmail.com>
+
+description: |
+  LED matrix controllers used in auxiliary display devices that drive individual
+  LED icons and 7-segment digit groups through a grid/segment addressing scheme.
+  Controllers manage a matrix of LEDs organized as grids (columns/banks in
+  vendor datasheets) and segments (rows/bit positions in vendor datasheets).
+  Maximum grid and segment indices are controller-specific.
+
+  The controller is agnostic of the display layout. Board-specific LED wiring is
+  described through child nodes that specify grid/segment coordinates for
+  individual icons and segment mapping for 7-segment digits.
+
+  The bindings use separate 'leds' and 'digits' containers to accommodate
+  different addressing schemes:
+  - LEDs use 2-cell addressing (grid, segment) for matrix coordinates
+  - Digits use 1-cell addressing with explicit segment mapping
+
+  The controller node exposes a logical LED-like control for the aggregate
+  display brightness. Child nodes describe individual icons and 7-seg digits.
+  The top-level control supports only label and brightness-related properties
+  and does not support other common LED properties such as color or function.
+  Child LED nodes use the standard LED binding.
+
+  Optional keypad scanning is supported when both 'linux,keymap' and
+  'poll-interval' properties are specified.
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - enum:
+              - fdhisi,fd628
+              - princeton,pt6964
+              - wxicore,aip1628
+          - const: titanmec,tm1628
+      - items:
+          - enum:
+              - wxicore,aip1618
+          - const: titanmec,tm1618
+      - items:
+          - enum:
+              - fdhisi,fd650
+              - wxicore,aip650
+          - const: titanmec,tm1650
+      - enum:
+          - fdhisi,fd620
+          - fdhisi,fd655
+          - fdhisi,fd6551
+          - titanmec,tm1618
+          - titanmec,tm1620
+          - titanmec,tm1628
+          - titanmec,tm1638
+          - titanmec,tm1650
+          - winrise,hbs658
+
+  reg:
+    maxItems: 1
+
+  label:
+    description:
+      The label for the top-level LED. If omitted, the label is taken from the
+      node name (excluding the unit address). It has to uniquely identify a
+      device, i.e. no other LED class device can be assigned the same label.
+    $ref: /schemas/leds/common.yaml#/properties/label
+
+  max-brightness:
+    description:
+      Normally the maximum brightness is determined by the hardware and this
+      property is not required. This property is used to put a software limit
+      on the brightness apart from what the driver says, as it could happen
+      that a LED can be made so bright that it gets damaged or causes damage
+      due to restrictions in a specific system, such as mounting conditions.
+    $ref: /schemas/leds/common.yaml#/properties/max-brightness
+
+  default-brightness:
+    description:
+      Brightness to be set if LED's default state is on. Used only during
+      initialization. If the option is not set then max brightness is used.
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+  digits:
+    type: object
+    description: Container for 7-segment digit group definitions
+    additionalProperties: false
+
+    properties:
+      "#address-cells":
+        const: 1
+      "#size-cells":
+        const: 0
+
+    patternProperties:
+      "^digit@[0-9]+$":
+        type: object
+        unevaluatedProperties: false
+
+        properties:
+          reg:
+            description: Digit position identifier
+            maxItems: 1
+
+          segments:
+            $ref: /schemas/types.yaml#/definitions/uint32-matrix
+            description: |
+              Array of grid/segment coordinate pairs for each 7-segment position.
+              Each entry is <grid segment> mapping to standard 7-segment positions
+              in order: a, b, c, d, e, f, g
+
+              Standard 7-segment layout:
+                 aaa
+                f   b
+                f   b
+                 ggg
+                e   c
+                e   c
+                 ddd
+            items:
+              items:
+                - description: Grid index
+                - description: Segment index
+            minItems: 7
+            maxItems: 7
+
+        required:
+          - reg
+          - segments
+
+  leds:
+    type: object
+    description: Container for individual LED icon definitions
+    additionalProperties: false
+
+    properties:
+      "#address-cells":
+        const: 2
+      "#size-cells":
+        const: 0
+
+    patternProperties:
+      "^led@[0-9]+,[0-9]+$":
+        type: object
+        $ref: /schemas/leds/common.yaml#
+        unevaluatedProperties: false
+
+        properties:
+          reg:
+            description:
+              Grid and segment indices as <grid segment> of this individual LED icon
+
+        required:
+          - reg
+
+allOf:
+  - $ref: /schemas/input/input.yaml#
+  - $ref: /schemas/input/matrix-keymap.yaml#
+
+dependencies:
+  poll-interval:
+    - linux,keymap
+  linux,keymap:
+    - poll-interval
+  autorepeat:
+    - linux,keymap
+    - poll-interval
+
+# SPI controllers require 3-wire (combined MISO/MOSI line)
+if:
+  properties:
+    compatible:
+      contains:
+        enum:
+          - fdhisi,fd620
+          - fdhisi,fd628
+          - princeton,pt6964
+          - titanmec,tm1618
+          - titanmec,tm1620
+          - titanmec,tm1628
+          - titanmec,tm1638
+          - wxicore,aip1618
+          - wxicore,aip1628
+then:
+  allOf:
+    - $ref: /schemas/spi/spi-peripheral-props.yaml#
+  properties:
+    spi-3wire: true
+  required:
+    - spi-3wire
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/leds/common.h>
+
+    // I2C example: Magicsee N5 TV box with fd655 controller
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      display@24 {
+        reg = <0x24>;
+        compatible = "fdhisi,fd655";
+
+        digits {
+          #address-cells = <1>;
+          #size-cells = <0>;
+
+          digit@0 {
+            reg = <0>;
+            segments = <4 3>, <4 4>, <4 5>, <4 0>, <4 1>, <4 2>, <4 6>;
+          };
+
+          digit@1 {
+            reg = <1>;
+            segments = <3 3>, <3 4>, <3 5>, <3 0>, <3 1>, <3 2>, <3 6>;
+          };
+
+          digit@2 {
+            reg = <2>;
+            segments = <2 3>, <2 4>, <2 5>, <2 0>, <2 1>, <2 2>, <2 6>;
+          };
+
+          digit@3 {
+            reg = <3>;
+            segments = <1 3>, <1 4>, <1 5>, <1 0>, <1 1>, <1 2>, <1 6>;
+          };
+        };
+
+        leds {
+          #address-cells = <2>;
+          #size-cells = <0>;
+
+          led@0,0 {
+            reg = <0 0>;
+            function = LED_FUNCTION_ALARM;
+          };
+
+          led@0,1 {
+            reg = <0 1>;
+            function = LED_FUNCTION_USB;
+          };
+
+          led@0,2 {
+            reg = <0 2>;
+            function = "play";
+          };
+
+          led@0,3 {
+            reg = <0 3>;
+            function = "pause";
+          };
+
+          led@0,4 {
+            reg = <0 4>;
+            function = "colon";
+          };
+
+          led@0,5 {
+            reg = <0 5>;
+            function = LED_FUNCTION_LAN;
+          };
+
+          led@0,6 {
+            reg = <0 6>;
+            function = LED_FUNCTION_WLAN;
+          };
+        };
+      };
+    };
+
+  - |
+    #include <dt-bindings/input/input.h>
+
+    // SPI example: TM1638 module with keypad support
+    spi {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      display@0 {
+        reg = <0>;
+        compatible = "titanmec,tm1638";
+        spi-3wire;
+        spi-lsb-first;
+        spi-max-frequency = <500000>;
+
+        label = "tm1638";
+        default-brightness = <2>;
+        max-brightness = <4>;
+        poll-interval = <100>;
+        linux,keymap = <MATRIX_KEY(2, 0, KEY_F1)
+                        MATRIX_KEY(2, 2, KEY_F2)
+                        MATRIX_KEY(2, 4, KEY_F3)
+                        MATRIX_KEY(2, 6, KEY_F4)
+                        MATRIX_KEY(2, 1, KEY_F5)
+                        MATRIX_KEY(2, 3, KEY_F6)
+                        MATRIX_KEY(2, 5, KEY_F7)
+                        MATRIX_KEY(2, 7, KEY_F8)>;
+
+        digits {
+          #address-cells = <1>;
+          #size-cells = <0>;
+
+          digit@0 {
+            reg = <0>;
+            segments = <7 0>, <7 1>, <7 2>, <7 3>, <7 4>, <7 5>, <7 6>;
+          };
+
+          digit@1 {
+            reg = <1>;
+            segments = <6 0>, <6 1>, <6 2>, <6 3>, <6 4>, <6 5>, <6 6>;
+          };
+
+          digit@2 {
+            reg = <2>;
+            segments = <5 0>, <5 1>, <5 2>, <5 3>, <5 4>, <5 5>, <5 6>;
+          };
+
+          digit@3 {
+            reg = <3>;
+            segments = <4 0>, <4 1>, <4 2>, <4 3>, <4 4>, <4 5>, <4 6>;
+          };
+
+          digit@4 {
+            reg = <4>;
+            segments = <3 0>, <3 1>, <3 2>, <3 3>, <3 4>, <3 5>, <3 6>;
+          };
+
+          digit@5 {
+            reg = <5>;
+            segments = <2 0>, <2 1>, <2 2>, <2 3>, <2 4>, <2 5>, <2 6>;
+          };
+
+          digit@6 {
+            reg = <6>;
+            segments = <1 0>, <1 1>, <1 2>, <1 3>, <1 4>, <1 5>, <1 6>;
+          };
+
+          digit@7 {
+            reg = <7>;
+            segments = <0 0>, <0 1>, <0 2>, <0 3>, <0 4>, <0 5>, <0 6>;
+          };
+        };
+
+        leds {
+          #address-cells = <2>;
+          #size-cells = <0>;
+
+          led@0,7 {
+            reg = <0 7>;
+          };
+
+          led@1,7 {
+            reg = <1 7>;
+          };
+
+          led@2,7 {
+            reg = <2 7>;
+          };
+
+          led@3,7 {
+            reg = <3 7>;
+          };
+
+          led@4,7 {
+            reg = <4 7>;
+          };
+
+          led@5,7 {
+            reg = <5 7>;
+          };
+
+          led@6,7 {
+            reg = <6 7>;
+          };
+
+          led@7,7 {
+            reg = <7 7>;
+          };
+        };
+      };
+    };
+
+  - |
+    #include <dt-bindings/leds/common.h>
+
+    // SPI example: X96 Max with transposed layout (fd628 with tm1628 fallback)
+    spi {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      display@0 {
+        reg = <0>;
+        compatible = "fdhisi,fd628", "titanmec,tm1628";
+        spi-3wire;
+        spi-lsb-first;
+        spi-max-frequency = <500000>;
+
+        digits {
+          #address-cells = <1>;
+          #size-cells = <0>;
+
+          digit@0 {
+            reg = <0>;
+            segments = <0 3>, <1 3>, <2 3>, <3 3>, <4 3>, <5 3>, <6 3>;
+          };
+
+          digit@1 {
+            reg = <1>;
+            segments = <0 2>, <1 2>, <2 2>, <3 2>, <4 2>, <5 2>, <6 2>;
+          };
+
+          digit@2 {
+            reg = <2>;
+            segments = <0 1>, <1 1>, <2 1>, <3 1>, <4 1>, <5 1>, <6 1>;
+          };
+
+          digit@3 {
+            reg = <3>;
+            segments = <0 0>, <1 0>, <2 0>, <3 0>, <4 0>, <5 0>, <6 0>;
+          };
+        };
+
+        leds {
+          #address-cells = <2>;
+          #size-cells = <0>;
+
+          led@0,4 {
+            reg = <0 4>;
+            function = "apps";
+          };
+
+          led@1,4 {
+            reg = <1 4>;
+            function = "setup";
+          };
+
+          led@2,4 {
+            reg = <2 4>;
+            function = LED_FUNCTION_USB;
+          };
+
+          led@3,4 {
+            reg = <3 4>;
+            function = LED_FUNCTION_SD;
+          };
+
+          led@4,4 {
+            reg = <4 4>;
+            function = "colon";
+          };
+
+          led@5,4 {
+            reg = <5 4>;
+            function = "hdmi";
+          };
+
+          led@6,4 {
+            reg = <6 4>;
+            function = "video";
+          };
+        };
+      };
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index daf520a13..4e5a7db6d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -25402,6 +25402,11 @@ W:	http://sourceforge.net/projects/tlan/
 F:	Documentation/networking/device_drivers/ethernet/ti/tlan.rst
 F:	drivers/net/ethernet/ti/tlan.*
 
+TM16XX-COMPATIBLE LED CONTROLLERS DISPLAY DRIVER
+M:	Jean-François Lessard <jefflessard3@gmail.com>
+S:	Maintained
+F:	Documentation/devicetree/bindings/auxdisplay/titanmec,tm16xx.yaml
+
 TMIO/SDHI MMC DRIVER
 M:	Wolfram Sang <wsa+renesas@sang-engineering.com>
 L:	linux-mmc@vger.kernel.org
-- 
2.43.0