Input: cyttsp - convert bindings to YAML and extend

This converts the CYTTSP "Cypress TrueTouch Standard Product"
to YAML bindings and fixes and adds some things in the process:

- Rename the bindings file to cypress,cy8ctma340 after the main
product in the series.
- Add proper compatibles for the two known products:
CY8CTMA340 and CY8CTST341.
- Deprecate "cypress,cyttsp-spi" and "cypress,cyttsp-i2c"
because device compatibles should be named after the
hardware and not after which bus they are connected to.
The topology implicitly tells us which bus it is and what
interface to used.
- Add VCPIN and VDD supplies, these are present just like
on the CY8CTMA140.

Reviewed-by: Rob Herring <[e-mail]>
Reviewed-by: Javier Martinez Canillas <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Dmitry Torokhov <[e-mail]>

Documentation/devicetree/bindings/input/touchscreen/cypress,cy8ctma340.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/touchscreen/cypress,cy8ctma340.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Cypress CY8CTMA340 series touchscreen controller bindings
+
+description: The Cypress CY8CTMA340 series (also known as "CYTTSP" after
+  the marketing name Cypress TrueTouch Standard Product) touchscreens can
+  be connected to either I2C or SPI buses.
+
+maintainers:
+  - Javier Martinez Canillas <[e-mail]>
+  - Linus Walleij <[e-mail]>
+
+allOf:
+  - $ref: touchscreen.yaml#
+
+properties:
+  $nodename:
+    pattern: "^touchscreen(@.*)?$"
+
+  compatible:
+    oneOf:
+      - const: cypress,cy8ctma340
+      - const: cypress,cy8ctst341
+      - const: cypress,cyttsp-spi
+        description: Legacy compatible for SPI connected CY8CTMA340
+        deprecated: true
+      - const: cypress,cyttsp-i2c
+        description: Legacy compatible for I2C connected CY8CTMA340
+        deprecated: true
+
+  reg:
+    description: I2C address when used on the I2C bus, or the SPI chip
+      select index when used on the SPI bus
+
+  clock-frequency:
+    description: I2C client clock frequency, defined for host when using
+      the device on the I2C bus
+    minimum: 0
+    maximum: 400000
+
+  spi-max-frequency:
+    description: SPI clock frequency, defined for host, defined when using
+      the device on the SPI bus. The throughput is maximum 2 Mbps so the
+      typical value is 2000000, if higher rates are used the total throughput
+      needs to be restricted to 2 Mbps.
+    minimum: 0
+    maximum: 6000000
+
+  interrupts:
+    description: Interrupt to host
+    maxItems: 1
+
+  vcpin-supply:
+    description: Analog power supply regulator on VCPIN pin
+
+  vdd-supply:
+    description: Digital power supply regulator on VDD pin
+
+  reset-gpios:
+    description: Reset line for the touchscreen, should be tagged
+      as GPIO_ACTIVE_LOW
+
+  bootloader-key:
+    description: the 8-byte bootloader key that is required to switch
+      the chip from bootloader mode (default mode) to application mode
+    $ref: /schemas/types.yaml#/definitions/uint8-array
+    minItems: 8
+    maxItems: 8
+
+  touchscreen-size-x: true
+  touchscreen-size-y: true
+  touchscreen-fuzz-x: true
+  touchscreen-fuzz-y: true
+
+  active-distance:
+    description: the distance in pixels beyond which a touch must move
+      before movement is detected and reported by the device
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 0
+    maximum: 15
+
+  active-interval-ms:
+    description: the minimum period in ms between consecutive
+      scanning/processing cycles when the chip is in active mode
+    minimum: 0
+    maximum: 255
+
+  lowpower-interval-ms:
+    description: the minimum period in ms between consecutive
+      scanning/processing cycles when the chip is in low-power mode
+    minimum: 0
+    maximum: 2550
+
+  touch-timeout-ms:
+    description: minimum time in ms spent in the active power state while no
+      touches are detected before entering low-power mode
+    minimum: 0
+    maximum: 2550
+
+  use-handshake:
+    description: enable register-based handshake (boolean). This should only
+      be used if the chip is configured to use 'blocking communication with
+      timeout' (in this case the device generates an interrupt at the end of
+      every scanning/processing cycle)
+    $ref: /schemas/types.yaml#/definitions/flag
+
+additionalProperties: false
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - bootloader-key
+  - touchscreen-size-x
+  - touchscreen-size-y
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/gpio/gpio.h>
+    spi {
+      #address-cells = <1>;
+      #size-cells = <0>;
+      num-cs = <1>;
+      cs-gpios = <&gpio 2 GPIO_ACTIVE_HIGH>;
+
+      touchscreen@0 {
+        compatible = "cypress,cy8ctma340";
+        reg = <0>;
+        interrupt-parent = <&gpio>;
+        interrupts = <20 IRQ_TYPE_EDGE_FALLING>;
+        reset-gpios = <&gpio 21 GPIO_ACTIVE_LOW>;
+        vdd-supply = <&ldo_aux1_reg>;
+        vcpin-supply = <&ldo_aux2_reg>;
+        bootloader-key = /bits/ 8 <0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07>;
+        touchscreen-size-x = <480>;
+        touchscreen-size-y = <800>;
+        active-interval-ms = <0>;
+        touch-timeout-ms = <255>;
+        lowpower-interval-ms = <10>;
+      };
+    };
+
+...

Documentation/devicetree/bindings/input/touchscreen/cyttsp.txt

···
-* Cypress cyttsp touchscreen controller
-
-Required properties:
- - compatible		: must be "cypress,cyttsp-i2c" or "cypress,cyttsp-spi"
- - reg			: Device I2C address or SPI chip select number
- - spi-max-frequency	: Maximum SPI clocking speed of the device (for cyttsp-spi)
- - interrupts		: (gpio) interrupt to which the chip is connected
-			  (see interrupt binding[0]).
- - bootloader-key	: the 8-byte bootloader key that is required to switch
-			  the chip from bootloader mode (default mode) to
-			  application mode.
-			  This property has to be specified as an array of 8
-			  '/bits/ 8' values.
-
-Optional properties:
- - reset-gpios		: the reset gpio the chip is connected to
-			  (see GPIO binding[1] for more details).
- - touchscreen-size-x	: horizontal resolution of touchscreen (in pixels)
- - touchscreen-size-y	: vertical resolution of touchscreen (in pixels)
- - touchscreen-fuzz-x	: horizontal noise value of the absolute input device
-			  (in pixels)
- - touchscreen-fuzz-y	: vertical noise value of the absolute input device
-			  (in pixels)
- - active-distance	: the distance in pixels beyond which a touch must move
-			  before movement is detected and reported by the device.
-			  Valid values: 0-15.
- - active-interval-ms	: the minimum period in ms between consecutive
-			  scanning/processing cycles when the chip is in active mode.
-			  Valid values: 0-255.
- - lowpower-interval-ms	: the minimum period in ms between consecutive
-			  scanning/processing cycles when the chip is in low-power mode.
-			  Valid values: 0-2550
- - touch-timeout-ms	: minimum time in ms spent in the active power state while no
-			  touches are detected before entering low-power mode.
-			  Valid values: 0-2550
- - use-handshake	: enable register-based handshake (boolean). This should
-			  only be used if the chip is configured to use 'blocking
-			  communication with timeout' (in this case the device
-			  generates an interrupt at the end of every
-			  scanning/processing cycle).
-
-[0]: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
-[1]: Documentation/devicetree/bindings/gpio/gpio.txt
-
-Example:
-	&i2c1 {
-		/* ... */
-		cyttsp@a {
-			compatible = "cypress,cyttsp-i2c";
-			reg = <0xa>;
-			interrupt-parent = <&gpio0>;
-			interrupts = <28 0>;
-			reset-gpios = <&gpio3 4 GPIO_ACTIVE_LOW>;
-
-			touchscreen-size-x = <800>;
-			touchscreen-size-y = <480>;
-			touchscreen-fuzz-x = <4>;
-			touchscreen-fuzz-y = <7>;
-
-			bootloader-key = /bits/ 8 <0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08>;
-			active-distance = <8>;
-			active-interval-ms = <0>;
-			lowpower-interval-ms = <200>;
-			touch-timeout-ms = <100>;
-		};
-
-		/* ... */
-	};
-
-	&mcspi1 {
-		/* ... */
-		cyttsp@0 {
-			compatible = "cypress,cyttsp-spi";
-			spi-max-frequency = <6000000>;
-			reg = <0>;
-			interrupt-parent = <&gpio0>;
-			interrupts = <28 0>;
-			reset-gpios = <&gpio3 4 GPIO_ACTIVE_LOW>;
-
-			touchscreen-size-x = <800>;
-			touchscreen-size-y = <480>;
-			touchscreen-fuzz-x = <4>;
-			touchscreen-fuzz-y = <7>;
-
-			bootloader-key = /bits/ 8 <0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08>;
-			active-distance = <8>;
-			active-interval-ms = <0>;
-			lowpower-interval-ms = <200>;
-			touch-timeout-ms = <100>;
-		};
-
-		/* ... */
-	};