dt-bindings: input: Document Imagis ISA1200 haptic motor driver

Document the Imagis ISA1200 haptic motor driver, used primarily in mobile handheld devices and capable of supporting up to two motors. The exact datasheet for the ISA1200 is not available; all data was modeled based on available downstream kernel sources for various devices and fragments of information scattered across the internet. Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com> Reviewed-by: Rob Herring (Arm) <robh@kernel.org> Link: https://patch.msgid.link/20260617070528.35006-2-clamor95@gmail.com Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
2026-09-22 12:44:03 +02:00 · 2026-06-17 10:05:26 +03:00 · 2026-06-17 10:05:26 +03:00 · 66788475a4
commit 66788475a4
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--- a/Documentation/devicetree/bindings/input/imagis,isa1200.yaml
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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/imagis,isa1200.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Imagis ISA1200 haptic motor driver
+
+maintainers:
+  - Svyatoslav Ryhel <clamor95@gmail.com>
+  - Linus Walleij <linusw@kernel.org>
+
+description:
+  The ISA1200 is a high-performance enhanced haptic motor driver designed
+  for mobile hand-held devices. It supports various voltages for both ERM
+  (Eccentric Rotating Mass) and LRA (Linear Resonant Actuator) type
+  actuators. Thanks to an embedded LDO, battery power can be used directly
+  in handheld applications.
+
+properties:
+  compatible:
+    const: imagis,isa1200
+
+  reg:
+    maxItems: 1
+
+  control-gpios:
+    description:
+      One or two GPIOs flagged as active high linked to HEN and LEN pins
+    minItems: 1
+    maxItems: 2
+
+  clocks:
+    maxItems: 1
+
+  pwms:
+    maxItems: 1
+
+  vdd-supply:
+    description:
+      Regulator for 2.4V - 5.5V power supply
+
+  vddp-supply:
+    description:
+      Regulator for 2.4V - 3.6V IO power supply
+
+  imagis,clk-div:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Divider for the external input clock/PWM
+    enum: [128, 256, 512, 1024]
+    default: 128
+
+  imagis,pll-div:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Divider for the internal PLL clock
+    minimum: 1
+    maximum: 15
+    default: 1
+
+  imagis,mode:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: |
+      Defines the motor type isa1200 drives
+      0 - LRA (Linear Resonant Actuator)
+      1 - ERM (Eccentric Rotating Mass)
+    enum: [0, 1]
+    default: 0
+
+  imagis,period-ns:
+    description:
+      Period of the internal PWM channel in nanoseconds.
+    minimum: 10000
+    maximum: 30000
+
+  imagis,duty-cycle-ns:
+    description:
+      Duty cycle of the external/internal PWM channel in nanoseconds,
+      defaults to 50% of the channel's period
+
+  ldo:
+    $ref: /schemas/regulator/regulator.yaml#
+    type: object
+    description:
+      Embedded LDO regulator with voltage range 2.3V - 3.8V
+    unevaluatedProperties: false
+
+    required:
+      - regulator-min-microvolt
+      - regulator-max-microvolt
+
+required:
+  - compatible
+  - reg
+  - ldo
+
+oneOf:
+  - required:
+      - clocks
+      - imagis,period-ns
+  - required:
+      - pwms
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        haptic-engine@49 {
+            compatible = "imagis,isa1200";
+            reg = <0x49>;
+
+            clocks = <&isa1200_refclk>;
+
+            control-gpios = <&gpio 22 GPIO_ACTIVE_HIGH>,
+                            <&gpio 23 GPIO_ACTIVE_HIGH>;
+
+            vdd-supply = <&vdd_3v3_vbat>;
+            vddp-supply = <&vdd_2v8_vvib>;
+
+            imagis,clk-div = <256>;
+            imagis,pll-div = <2>;
+
+            imagis,mode = <0>; /* LRA_MODE */
+
+            imagis,period-ns = <13400>;
+            imagis,duty-cycle-ns = <100>;
+
+            ldo {
+                regulator-name = "vdd_vib";
+                regulator-min-microvolt = <2300000>;
+                regulator-max-microvolt = <2300000>;
+            };
+        };
+    };