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arm64: dts: marvell: armada-37xx: reserve memory for ATF

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The PSCI area should be reserved in Linux for PSCI operations such as
suspend/resume.

Reserve 2MiB of memory which matches the area used by ATF (BL1, BL2,
BL3x, see [1] in ATF source code). This covers all PSCI code and data
area and is 2MiB aligned, which is required by Linux for huge pages
handling.

Please note that this is a default setup allowing to perform PSCI
operations with legacy bootloaders. Recent bootloaders should update the
region size/position accordingly.

[1] plat/marvell/a3700/common/include/platform_def.h

Signed-off-by: Victor Gu <xigu@marvell.com>
[miquel.raynal@bootlin.com: reword of commit message, comment in the DTSI]
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
This commit is contained in:
Victor Gu 2018-06-26 10:17:01 +02:00 committed by Gregory CLEMENT
parent d970737fa3
commit 4436a3711e
1 changed files with 15 additions and 0 deletions
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15
arch/arm64/boot/dts/marvell/armada-37xx.dtsi
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@ -22,6 +22,21 @@
serial1 = &uart1;
};
reserved-memory {
#address-cells = <2>;
#size-cells = <2>;
ranges;
/*
* The PSCI firmware region depicted below is the default one
* and should be updated by the bootloader.
*/
psci-area@4000000 {
reg = <0 0x4000000 0 0x200000>;
no-map;
};
};
cpus {
#address-cells = <1>;
#size-cells = <0>;