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arm64: dts: mediatek: mt8173-elm-hana: Add vdd-supply to second source trackpad

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The Hana device has a second source option trackpad, but it is missing
its regulator supply. It only works because the regulator is marked as
always-on.

Add the regulator supply, but leave out the post-power-on delay. Instead,
document the post-power-on delay along with the reason for not adding
it in a comment.

Fixes: 689b937bed ("arm64: dts: mediatek: add mt8173 elm and hana board")
Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20241018082001.1296963-1-wenst@chromium.org
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
This commit is contained in:
Chen-Yu Tsai 2024-10-18 16:20:00 +08:00 committed by AngeloGioacchino Del Regno
parent 26ea2459d1
commit f766fae08f
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arch/arm64/boot/dts/mediatek/mt8173-elm-hana.dtsi
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@ -49,6 +49,14 @@ trackpad2: trackpad@2c {
interrupts-extended = <&pio 117 IRQ_TYPE_LEVEL_LOW>;
reg = <0x2c>;
hid-descr-addr = <0x0020>;
/*
* The trackpad needs a post-power-on delay of 100ms,
* but at time of writing, the power supply for it on
* this board is always on. The delay is therefore not
* added to avoid impacting the readiness of the
* trackpad.
*/
vdd-supply = <&mt6397_vgp6_reg>;
wakeup-source;
};
};