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2ca376ef18
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
90 lines
2.1 KiB
YAML
90 lines
2.1 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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$id: http://devicetree.org/schemas/input/goodix,gt7375p.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Goodix GT7375P touchscreen
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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 Goodix GT7375P touchscreen.
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This touchscreen uses the i2c-hid protocol but has some non-standard
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power sequencing required.
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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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oneOf:
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- const: goodix,gt7375p
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- items:
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- const: goodix,gt7986u
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- const: goodix,gt7375p
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reg:
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enum:
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- 0x5d
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- 0x14
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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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true
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vdd-supply:
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description: The 3.3V supply to the touchscreen.
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mainboard-vddio-supply:
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description:
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The supply on the main board needed to power up IO signals going
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to the touchscreen. This supply need not go to the touchscreen
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itself as long as it allows the main board to make signals compatible
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with what the touchscreen is expecting for its IO rails.
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goodix,no-reset-during-suspend:
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description:
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Set this to true to enforce the driver to not assert the reset GPIO
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during suspend.
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Due to potential touchscreen hardware flaw, back-powering could happen in
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suspend if the power supply is on and with active-low reset GPIO asserted.
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This property is used to avoid the back-powering issue.
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type: boolean
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required:
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- compatible
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- reg
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- interrupts
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- reset-gpios
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- vdd-supply
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additionalProperties: false
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examples:
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- |
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#include <dt-bindings/clock/qcom,rpmh.h>
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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@5d {
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compatible = "goodix,gt7375p";
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reg = <0x5d>;
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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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vdd-supply = <&pp3300_ts>;
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};
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};
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