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arm64: dts: apple: t8142-j704: PMP always-on, trackpad actuator, MCC #1847

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arm64: dts: apple: t8142-j704: PMP always-on, trackpad actuator, MCC #1847

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e30a7ce
arm64: dts: apple: t8142-j704: Keep the PMP power domain on
dmitzsaz Nov 13, 2026
b484d69
arm64: dts: apple: t8142-j704: Add the trackpad actuator
dmitzsaz Nov 13, 2026
a54463e
arm64: dts: apple: t8142-j704: Enable the system level cache (MCC)
dmitzsaz Nov 13, 2026
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13 changes: 13 additions & 0 deletions arch/arm64/boot/dts/apple/t8142-j704-peripherals.dtsi
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Original file line number Diff line number Diff line change
Expand Up @@ -60,6 +60,12 @@
label = "pmp";
/* The PMP's SRAM, which the driver reads first. */
power-domains = <&ps_pms_sram>;
/*
* As on T8140/T8132 and the J813: the PMP firmware keeps running
* DCS and fabric DVFS. If genpd gates this domain at s2idle, the
* PMP crashes on its own MMIO.
*/
apple,always-on;
};

ps_pms_sram: power-controller@5a0 {
Expand Down Expand Up @@ -247,6 +253,13 @@

/* Layout is filled by the loader using this machine's own data. */
keyboard: keyboard { };

/*
* The trackpad's haptic engine. The MTP firmware offers it
* as interface 4 "actuator"; without this node the click
* stays firmware-driven and there is no Force Touch stage.
*/
actuator { };
};
};
};
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5 changes: 5 additions & 0 deletions arch/arm64/boot/dts/apple/t8142-j704.dts
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Expand Up @@ -314,6 +314,11 @@
status = "okay";
};

/* aura (mcc_init_m5) turns the system level cache on; the driver confirms it and flushes on shutdown. */
&mcc {
status = "okay";
};

#include "t8142-j704-display.dtsi"
#include "t8142-j704-peripherals.dtsi"
#include "t8142-j704-usb.dtsi"
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