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As talked about in the patch ("drm/panel: Add a way for other devices
to follow panel state"), touchscreens that are connected to panels are
generally expected to be power sequenced together with the panel
they're attached to. Today, nothing provides information allowing you
to find out that a touchscreen is connected to a panel. Let's add a
phandle for this.
The proerty is added to the generic touchscreen bindings and then
enabled in the bindings for the i2c-hid backed devices. This can and
should be added for other touchscreens in the future, but for now
let's start small.
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Reviewed-by: Benjamin Tissoires <bentiss@kernel.org>
Acked-by: Benjamin Tissoires <bentiss@kernel.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230727101636.v4.1.Id68e30343bb1e11470582a9078b086176cfec46b@changeid
71 lines
1.5 KiB
YAML
71 lines
1.5 KiB
YAML
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/input/elan,ekth6915.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Elan eKTH6915 touchscreen controller
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maintainers:
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- Douglas Anderson <dianders@chromium.org>
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description:
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Supports the Elan eKTH6915 touchscreen controller.
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This touchscreen controller uses the i2c-hid protocol with a reset GPIO.
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allOf:
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- $ref: /schemas/input/touchscreen/touchscreen.yaml#
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properties:
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compatible:
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items:
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- const: elan,ekth6915
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reg:
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const: 0x10
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interrupts:
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maxItems: 1
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panel: true
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reset-gpios:
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description: Reset GPIO; not all touchscreens using eKTH6915 hook this up.
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vcc33-supply:
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description: The 3.3V supply to the touchscreen.
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vccio-supply:
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description:
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The IO supply to the touchscreen. Need not be specified if this is the
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same as the 3.3V supply.
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required:
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- compatible
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- reg
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- interrupts
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- vcc33-supply
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additionalProperties: false
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examples:
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- |
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#include <dt-bindings/gpio/gpio.h>
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#include <dt-bindings/interrupt-controller/irq.h>
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i2c {
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#address-cells = <1>;
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#size-cells = <0>;
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ap_ts: touchscreen@10 {
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compatible = "elan,ekth6915";
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reg = <0x10>;
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interrupt-parent = <&tlmm>;
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interrupts = <9 IRQ_TYPE_LEVEL_LOW>;
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reset-gpios = <&tlmm 8 GPIO_ACTIVE_LOW>;
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vcc33-supply = <&pp3300_ts>;
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};
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};
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