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arm64: dts: allwinner: Add sun4i MMIO timer nodes

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For a CPU to enter an idle state, some timer must be available to
trigger an IRQ and wake it back up. The local ARM architectural timer is
not sufficient, because that timer stops when the CPU is powered down.
The ARM architectural timer from some other CPU can be used, but doing
so prevents that other CPU from entering an idle state. For all CPUs to
power down at the same time, Linux needs a timer which is not tied to
any CPU.

Hook up the "sun4i" timer so it can be used for this purpose. It runs at
24 MHz, which balances resolution and power consumption.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20210322044707.19479-5-samuel@sholland.org
This commit is contained in:
Samuel Holland
2021-03-21 23:47:06 -05:00
committed by Maxime Ripard
parent af97dd5559
commit 12bcaacaff
2 changed files with 18 additions and 0 deletions
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9
arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
View File

@@ -799,6 +799,15 @@ uart4_rts_cts_pins: uart4-rts-cts-pins {
};
};
timer@1c20c00 {
compatible = "allwinner,sun50i-a64-timer",
"allwinner,sun8i-a23-timer";
reg = <0x01c20c00 0xa0>;
interrupts = <GIC_SPI 18 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 19 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&osc24M>;
};
wdt0: watchdog@1c20ca0 {
compatible = "allwinner,sun50i-a64-wdt",
"allwinner,sun6i-a31-wdt";

9
arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
View File

@@ -271,6 +271,15 @@ cpu_speed_grade: cpu-speed-grade@1c {
};
};
timer@3009000 {
compatible = "allwinner,sun50i-h6-timer",
"allwinner,sun8i-a23-timer";
reg = <0x03009000 0xa0>;
interrupts = <GIC_SPI 48 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 49 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&osc24M>;
};
watchdog: watchdog@30090a0 {
compatible = "allwinner,sun50i-h6-wdt",
"allwinner,sun6i-a31-wdt";