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ARM: dts: bcm2711: Move emmc2 into its own bus

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Depending on bcm2711's revision its emmc2 controller might have
different DMA constraints. Raspberry Pi 4's firmware will take care of
updating those, but only if a certain alias is found in the device tree.
So, move emmc2 into its own bus, so as not to pollute other devices with
dma-ranges changes and create the emmc2bus alias.

Based in Phil ELwell's downstream implementation.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Link: https://lore.kernel.org/r/20200304132437.20164-1-nsaenzjulienne@suse.de
This commit is contained in:
Nicolas Saenz Julienne 2020-03-04 14:24:37 +01:00
parent cd87c180b3
commit 3d2cbb6448
2 changed files with 21 additions and 5 deletions
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1
arch/arm/boot/dts/bcm2711-rpi-4-b.dts
View file

@ -20,6 +20,7 @@ memory@0 {
};
aliases {
emmc2bus = &emmc2bus;
ethernet0 = &genet;
};

25
arch/arm/boot/dts/bcm2711.dtsi
View file

@ -241,17 +241,32 @@ pwm1: pwm@7e20c800 {
status = "disabled";
};
hvs@7e400000 {
interrupts = <GIC_SPI 97 IRQ_TYPE_LEVEL_HIGH>;
};
};
/*
* emmc2 has different DMA constraints based on SoC revisions. It was
* moved into its own bus, so as for RPi4's firmware to update them.
* The firmware will find whether the emmc2bus alias is defined, and if
* so, it'll edit the dma-ranges property below accordingly.
*/
emmc2bus: emmc2bus {
compatible = "simple-bus";
#address-cells = <2>;
#size-cells = <1>;
ranges = <0x0 0x7e000000 0x0 0xfe000000 0x01800000>;
dma-ranges = <0x0 0xc0000000 0x0 0x00000000 0x40000000>;
emmc2: emmc2@7e340000 {
compatible = "brcm,bcm2711-emmc2";
reg = <0x7e340000 0x100>;
reg = <0x0 0x7e340000 0x100>;
interrupts = <GIC_SPI 126 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&clocks BCM2711_CLOCK_EMMC2>;
status = "disabled";
};
hvs@7e400000 {
interrupts = <GIC_SPI 97 IRQ_TYPE_LEVEL_HIGH>;
};
};
arm-pmu {