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Allwinner A83T SoC has a low res adc like the one in Allwinner A10 SoC, however, the A10 SoC's vref of lradc internally is divided by 2/3 and the A83T SoC's vref of lradc internally is divided by 3/4, thus add a hardware variant for it to be compatible with various devices. Signed-off-by: Ziping Chen <techping.chan@gmail.com> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
65 lines
1.4 KiB
Plaintext
65 lines
1.4 KiB
Plaintext
Allwinner sun4i low res adc attached tablet keys
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------------------------------------------------
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Required properties:
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- compatible: should be one of the following string:
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"allwinner,sun4i-a10-lradc-keys"
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"allwinner,sun8i-a83t-r-lradc"
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- reg: mmio address range of the chip
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- interrupts: interrupt to which the chip is connected
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- vref-supply: powersupply for the lradc reference voltage
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Each key is represented as a sub-node of the compatible mentioned above:
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Required subnode-properties:
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- label: Descriptive name of the key.
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- linux,code: Keycode to emit.
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- channel: Channel this key is attached to, must be 0 or 1.
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- voltage: Voltage in µV at lradc input when this key is pressed.
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Example:
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#include <dt-bindings/input/input.h>
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lradc: lradc@1c22800 {
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compatible = "allwinner,sun4i-a10-lradc-keys";
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reg = <0x01c22800 0x100>;
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interrupts = <31>;
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vref-supply = <®_vcc3v0>;
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button@191 {
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label = "Volume Up";
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linux,code = <KEY_VOLUMEUP>;
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channel = <0>;
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voltage = <191274>;
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};
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button@392 {
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label = "Volume Down";
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linux,code = <KEY_VOLUMEDOWN>;
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channel = <0>;
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voltage = <392644>;
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};
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button@601 {
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label = "Menu";
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linux,code = <KEY_MENU>;
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channel = <0>;
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voltage = <601151>;
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};
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button@795 {
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label = "Enter";
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linux,code = <KEY_ENTER>;
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channel = <0>;
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voltage = <795090>;
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};
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button@987 {
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label = "Home";
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linux,code = <KEY_HOMEPAGE>;
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channel = <0>;
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voltage = <987387>;
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};
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};
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