dt-bindings: mfd: Convert STMPE to YAML schema

This converts the STMPE MFD device tree bindings to the YAML
schema.

Reference the existing schema for the ADC, just define the
other subnode schemas directly in the MFD schema.

Add two examples so we have examples covering both the simple
GPIO expander and the more complex with ADC and touchscreen.

Some in-tree users do not follow the naming conventions for nodes
so these DTS files need to be augmented to use proper node names
like "adc", "pwm", "gpio", "keyboard-controller" etc before the
bindings take effect on them.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230709-stmpe-dt-bindings-v5-1-34a3d6ee1e57@linaro.org
Signed-off-by: Lee Jones <lee@kernel.org>

1 files changed, 297 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/mfd/st,stmpe.yaml b/Documentation/devicetree/bindings/mfd/st,stmpe.yaml
new file mode 100644
index 000000000000..b77cc3f3075d
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/st,stmpe.yaml
@@ -0,0 +1,297 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/st,stmpe.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: STMicroelectonics Port Expander (STMPE)
+
+description: STMicroelectronics Port Expander (STMPE) is a series of slow
+  bus controllers for various expanded peripherals such as GPIO, keypad,
+  touchscreen, ADC, PWM or rotator. It can contain one or several different
+  peripherals connected to SPI or I2C.
+
+maintainers:
+  - Linus Walleij <linus.walleij@linaro.org>
+
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+properties:
+  compatible:
+    enum:
+      - st,stmpe601
+      - st,stmpe801
+      - st,stmpe811
+      - st,stmpe1600
+      - st,stmpe1601
+      - st,stmpe2401
+      - st,stmpe2403
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  vcc-supply: true
+
+  vio-supply: true
+
+  reset-gpios:
+    maxItems: 1
+
+  wakeup-source: true
+
+  st,autosleep-timeout:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [ 4, 16, 32, 64, 128, 256, 512, 1024 ]
+    description: Time idle before going to automatic sleep to save power
+
+  st,sample-time:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [ 0, 1, 2, 3, 4, 5, 6 ]
+    description: |
+      Sample time per iteration
+      0 = 36 clock ticks
+      1 = 44 clock ticks
+      2 = 56 clock ticks
+      3 = 64 clock ticks
+      4 = 80 clock ticks - recommended
+      5 = 96 clock ticks
+      6 = 124 clock ticks
+
+  st,mod-12b:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [ 0, 1 ]
+    description: ADC bit mode 0 = 10bit ADC, 1 = 12bit ADC
+
+  st,ref-sel:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [ 0, 1 ]
+    description: ADC reference source 0 = internal, 1 = external
+
+  st,adc-freq:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [ 0, 1, 2, 3 ]
+    description: |
+      ADC clock speed
+      0 = 1.625 MHz
+      1 = 3.25 MHz
+      2, 3 = 6.5 MHz
+
+  adc:
+    type: object
+    $ref: /schemas/iio/adc/st,stmpe-adc.yaml#
+
+  gpio:
+    type: object
+    $ref: /schemas/gpio/st,stmpe-gpio.yaml#
+
+  keyboard-controller:
+    type: object
+    $ref: /schemas/input/matrix-keymap.yaml#
+
+    unevaluatedProperties: false
+
+    properties:
+      compatible:
+        const: st,stmpe-keypad
+
+      debounce-interval:
+        description: Debouncing interval in milliseconds
+        $ref: /schemas/types.yaml#/definitions/uint32
+
+      st,no-autorepeat:
+        description: If present, the keys will not autorepeat when pressed
+        $ref: /schemas/types.yaml#/definitions/flag
+
+      st,scan-count:
+        description: Scanning cycles elapsed before key data is updated
+        $ref: /schemas/types.yaml#/definitions/uint32
+
+    required:
+      - compatible
+      - linux,keymap
+
+  pwm:
+    type: object
+    $ref: /schemas/pwm/pwm.yaml#
+
+    unevaluatedProperties: false
+
+    properties:
+      compatible:
+        const: st,stmpe-pwm
+
+      "#pwm-cells":
+        const: 2
+
+  touchscreen:
+    type: object
+    $ref: /schemas/input/touchscreen/touchscreen.yaml#
+
+    unevaluatedProperties: false
+
+    properties:
+      compatible:
+        const: st,stmpe-ts
+
+      st,ave-ctrl:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        enum: [ 0, 1, 2, 3 ]
+        description: |
+          Sample average control
+          0 = 1 sample
+          1 = 2 samples
+          2 = 4 samples
+          3 = 8 samples
+
+      st,touch-det-delay:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        enum: [ 0, 1, 2, 3, 4, 5, 6, 7 ]
+        description: |
+          Touch detection delay
+          0 = 10 us
+          1 = 50 us
+          2 = 100 us
+          3 = 500 us - recommended
+          4 = 1 ms
+          5 = 5 ms
+          6 = 10 ms
+          7 = 50 ms
+
+      st,settling:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        enum: [ 0, 1, 2, 3, 4, 5, 6, 7 ]
+        description: |
+          Panel driver settling time
+          0 = 10 us
+          1 = 100 us
+          2 = 500 us - recommended
+          3 = 1 ms
+          4 = 5 ms
+          5 = 10 ms
+          6 = 50 ms
+          7 = 100 ms
+
+      st,fraction-z:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        enum: [ 0, 1, 2, 3, 4, 5, 6, 7 ]
+        description: Length of the fractional part in z, recommended is 7
+          (fraction-z ([0..7]) = Count of the fractional part)
+
+      st,i-drive:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        enum: [ 0, 1 ]
+        description: |
+          current limit value of the touchscreen drivers
+          0 = 20 mA (typical 35 mA max)
+          1 = 50 mA (typical 80 mA max)
+
+    required:
+      - compatible
+
+additionalProperties: false
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/input/input.h>
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      port-expander@43 {
+        compatible = "st,stmpe2401";
+        reg = <0x43>;
+        reset-gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
+        interrupts = <26 IRQ_TYPE_EDGE_FALLING>;
+        interrupt-parent = <&gpio>;
+        vcc-supply = <&db8500_vsmps2_reg>;
+        vio-supply = <&db8500_vsmps2_reg>;
+        wakeup-source;
+        st,autosleep-timeout = <1024>;
+
+        gpio {
+          compatible = "st,stmpe-gpio";
+          gpio-controller;
+          #gpio-cells = <2>;
+          interrupt-controller;
+          #interrupt-cells = <2>;
+          st,norequest-mask = <0xf0f002>;
+        };
+
+        keyboard-controller {
+          compatible = "st,stmpe-keypad";
+          debounce-interval = <64>;
+          st,scan-count = <8>;
+          st,no-autorepeat;
+          keypad,num-rows = <8>;
+          keypad,num-columns = <8>;
+          linux,keymap = <
+              MATRIX_KEY(0x00, 0x00, KEY_1)
+              MATRIX_KEY(0x00, 0x01, KEY_2)
+              MATRIX_KEY(0x00, 0x02, KEY_3)
+              MATRIX_KEY(0x00, 0x03, KEY_4)
+              MATRIX_KEY(0x00, 0x04, KEY_5)
+              MATRIX_KEY(0x00, 0x05, KEY_6)
+              MATRIX_KEY(0x00, 0x06, KEY_7)
+              MATRIX_KEY(0x00, 0x07, KEY_8)
+              MATRIX_KEY(0x00, 0x08, KEY_9)
+              MATRIX_KEY(0x00, 0x09, KEY_0)
+          >;
+        };
+
+        pwm {
+          compatible = "st,stmpe-pwm";
+          #pwm-cells = <2>;
+        };
+      };
+
+      port-expander@41 {
+        compatible = "st,stmpe811";
+        reg = <0x41>;
+        interrupts = <10 IRQ_TYPE_LEVEL_LOW>;
+        interrupt-parent = <&gpio>;
+        st,adc-freq = <1>;
+        st,mod-12b = <1>;
+        st,ref-sel = <0>;
+        st,sample-time = <4>;
+
+        adc {
+          compatible = "st,stmpe-adc";
+          st,norequest-mask = <0x0f>;
+          #io-channel-cells = <1>;
+        };
+
+        gpio {
+          compatible = "st,stmpe-gpio";
+          gpio-controller;
+          #gpio-cells = <2>;
+          interrupt-controller;
+          #interrupt-cells = <2>;
+        };
+
+        pwm {
+          compatible = "st,stmpe-pwm";
+          #pwm-cells = <2>;
+        };
+
+        touchscreen {
+          compatible = "st,stmpe-ts";
+          st,ave-ctrl = <3>;
+          st,touch-det-delay = <5>;
+          st,settling = <3>;
+          st,fraction-z = <7>;
+          st,i-drive = <1>;
+        };
+      };
+    };
+...