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afe10358e4
Elan touchscreen controllers use two power supplies, vcc33 and vccio, and we need to enable them before trying to access the device. On X86 firmware usually does this, but on ARM it is usually left to the kernel. Signed-off-by: Dmitry Torokhov <dtor@chromium.org> Reviewed-by: Benson Leung <bleung@chromium.org> Reviewed-by: Scott Liu <scott.liu@emc.com.tw> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
37 lines
1.1 KiB
Plaintext
37 lines
1.1 KiB
Plaintext
Elantech I2C Touchscreen
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Required properties:
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- compatible: must be "elan,ekth3500".
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- reg: I2C address of the chip.
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- interrupt-parent: a phandle for the interrupt controller (see interrupt
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binding[0]).
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- interrupts: interrupt to which the chip is connected (see interrupt
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binding[0]).
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Optional properties:
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- wakeup-source: touchscreen can be used as a wakeup source.
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- pinctrl-names: should be "default" (see pinctrl binding [1]).
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- pinctrl-0: a phandle pointing to the pin settings for the device (see
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pinctrl binding [1]).
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- reset-gpios: reset gpio the chip is connected to.
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- vcc33-supply: a phandle for the regulator supplying 3.3V power.
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- vccio-supply: a phandle for the regulator supplying IO power.
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[0]: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
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[1]: Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
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Example:
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&i2c1 {
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/* ... */
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touchscreen@10 {
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compatible = "elan,ekth3500";
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reg = <0x10>;
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interrupt-parent = <&gpio4>;
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interrupts = <0x0 IRQ_TYPE_EDGE_FALLING>;
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wakeup-source;
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};
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/* ... */
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};
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