dt-bindings: input: touchscreen: convert ads7846.txt to yaml

Convert binding doc ads7846.txt to yaml format.
Additional change:
- add ref to touchscreen.yaml and spi-peripheral-props.yaml.
- use common node name touchscreen.
- sort ti properties alphabetically.
- sort common properties alphabetically.
- sort compatible string alphabetically.
- remove vcc-supply from required list.
- deprecated ti,x-min, ti,y-min

Fix below warning: arch/arm64/boot/dts/freescale/imx8mm-var-som-symphony.dtb: touchscreen@0:
	ti,x-min: b'\x00}' is not of type 'object', 'array', 'boolean', 'null'

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Marek Vasut <marex@denx.de>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20240826162302.960732-1-Frank.Li@nxp.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Documentation/devicetree/bindings/input/touchscreen/ti,ads7843.yaml

@@ -0,0 +1,183 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/touchscreen/ti,ads7843.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: TI's SPI driven touch screen controllers
+
+maintainers:
+  - Alexander Stein <alexander.stein@ew.tq-group.com>
+  - Dmitry Torokhov <dmitry.torokhov@gmail.com>
+  - Marek Vasut <marex@denx.de>
+
+description:
+  TI's ADS7843, ADS7845, ADS7846, ADS7873, TSC2046 SPI driven touch screen
+  controllers.
+
+properties:
+  compatible:
+    enum:
+      - ti,ads7843
+      - ti,ads7845
+      - ti,ads7846
+      - ti,ads7873
+      - ti,tsc2046
+
+  interrupts:
+    maxItems: 1
+
+  pendown-gpio:
+    maxItems: 1
+    description:
+      GPIO handle describing the pin the !PENIRQ line is connected to.
+
+  vcc-supply:
+    description:
+      A regulator node for the supply voltage.
+
+  wakeup-source: true
+
+  ti,debounce-max:
+    deprecated: true
+    $ref: /schemas/types.yaml#/definitions/uint16
+    description:
+      Max number of additional readings per sample.
+
+  ti,debounce-rep:
+    $ref: /schemas/types.yaml#/definitions/uint16
+    description:
+      Additional consecutive good readings required after the first two.
+
+  ti,debounce-tol:
+    $ref: /schemas/types.yaml#/definitions/uint16
+    description:
+      Tolerance used for filtering.
+
+  ti,hsync-gpios:
+    maxItems: 1
+    description:
+      GPIO line to poll for hsync.
+
+  ti,keep-vref-on:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      Set to keep Vref on for differential measurements as well.
+
+  ti,pendown-gpio-debounce:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Platform specific debounce time for the pendown-gpio.
+
+  ti,penirq-recheck-delay-usecs:
+    $ref: /schemas/types.yaml#/definitions/uint16
+    description:
+      If set to non-zero, after samples are taken this delay is applied and
+      penirq is rechecked, to help avoid false events.  This value is
+      affected by the material used to build the touch layer.
+
+  ti,pressure-max:
+    deprecated: true
+    $ref: /schemas/types.yaml#/definitions/uint16
+    description:
+      Maximum reported pressure value.
+
+  ti,pressure-min:
+    deprecated: true
+    $ref: /schemas/types.yaml#/definitions/uint16
+    description:
+      Minimum reported pressure value (threshold).
+
+  ti,settle-delay-usec:
+    $ref: /schemas/types.yaml#/definitions/uint16
+    description:
+      Settling time of the analog signals; a function of Vcc and the
+      capacitance on the X/Y drivers.  If set to non-zero, two samples are
+      taken with settle_delay us apart, and the second one is used. ~150
+      uSec with 0.01uF caps.
+
+  ti,swap-xy:
+    deprecated: true
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      Swap x and y axis.
+
+  ti,vref-delay-usecs:
+    $ref: /schemas/types.yaml#/definitions/uint16
+    description:
+      Vref supply delay in usecs, 0 for external Vref.
+
+  ti,vref-mv:
+    $ref: /schemas/types.yaml#/definitions/uint16
+    description:
+      The VREF voltage, in millivolts.
+      Set to 0 to use internal references (ADS7846).
+
+  ti,x-plate-ohms:
+    $ref: /schemas/types.yaml#/definitions/uint16
+    description:
+      Resistance of the X-plate, in Ohms.
+
+  ti,x-max:
+    deprecated: true
+    $ref: /schemas/types.yaml#/definitions/uint16
+    description:
+      Maximum value on the X axis.
+
+  ti,x-min:
+    deprecated: true
+    $ref: /schemas/types.yaml#/definitions/uint16
+    description:
+      Minimum value on the X axis.
+
+  ti,y-plate-ohms:
+    $ref: /schemas/types.yaml#/definitions/uint16
+    description:
+      Resistance of the Y-plate, in Ohms.
+
+  ti,y-max:
+    deprecated: true
+    $ref: /schemas/types.yaml#/definitions/uint16
+    description:
+      Maximum value on the Y axis.
+
+  ti,y-min:
+    deprecated: true
+    $ref: /schemas/types.yaml#/definitions/uint16
+    description:
+      Minimum value on the Y axis.
+
+required:
+  - compatible
+  - reg
+
+allOf:
+  - $ref: touchscreen.yaml#
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    spi{
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        touchscreen@0 {
+           compatible = "ti,tsc2046";
+           reg = <0>;	/* CS0 */
+           interrupt-parent = <&gpio1>;
+           interrupts = <8 0>;	/* BOOT6 / GPIO 8 */
+           pendown-gpio = <&gpio1 8 0>;
+           spi-max-frequency = <1000000>;
+           vcc-supply = <&reg_vcc3>;
+           wakeup-source;
+
+           ti,pressure-max = /bits/ 16 <255>;
+           ti,x-max = /bits/ 16 <8000>;
+           ti,x-min = /bits/ 16 <0>;
+           ti,x-plate-ohms = /bits/ 16 <40>;
+           ti,y-max = /bits/ 16 <4800>;
+           ti,y-min = /bits/ 16 <0>;
+       };
+    };