RE: [PATCH 3/3] arm64: dts: realtek: Add Kent SoC and EVB device trees

From: Eleanor Lin [林祐君]

Date: Tue Nov 11 2025 - 07:26:04 EST

> On 05/11/2025 11:44, Yu-Chun Lin wrote:
> > Add Device Tree hierarchy for Realtek Kent SoC family:
> >
> > - kent.dtsi: base SoC layer
> > - rtd<variant>.dtsi: SoC variant layer
> > - rtd<variant>-<board>.dtsi: board layer
> > - rtd<variant>-<board>-<config>.dts: board configuration layer
> >
> > Include RTD1501S Phantom EVB (8GB), RTD1861B Krypton EVB (8GB), and
> > RTD1920S Smallville EVB (4GB).
> >
> > Signed-off-by: Yu-Chun Lin <eleanor.lin@xxxxxxxxxxx>
> > ---
> > arch/arm64/boot/dts/realtek/Makefile | 5 +
> > arch/arm64/boot/dts/realtek/kent.dtsi | 179
> ++++++++++++++++++
> > arch/arm64/boot/dts/realtek/rtd1501.dtsi | 13 ++
> > .../boot/dts/realtek/rtd1501s-phantom-8gb.dts | 26 +++
> > .../boot/dts/realtek/rtd1501s-phantom.dtsi | 135 +++++++++++++
> > arch/arm64/boot/dts/realtek/rtd1861.dtsi | 13 ++
> > .../boot/dts/realtek/rtd1861b-krypton-8gb.dts | 26 +++
> > .../boot/dts/realtek/rtd1861b-krypton.dtsi | 79 ++++++++
> > arch/arm64/boot/dts/realtek/rtd1920.dtsi | 13 ++
> > .../dts/realtek/rtd1920s-smallville-4gb.dts | 24 +++
> > .../boot/dts/realtek/rtd1920s-smallville.dtsi | 145 ++++++++++++++
> > 11 files changed, 658 insertions(+)
> > create mode 100644 arch/arm64/boot/dts/realtek/kent.dtsi
> > create mode 100644 arch/arm64/boot/dts/realtek/rtd1501.dtsi
> > create mode 100644
> > arch/arm64/boot/dts/realtek/rtd1501s-phantom-8gb.dts
> > create mode 100644 arch/arm64/boot/dts/realtek/rtd1501s-phantom.dtsi
> > create mode 100644 arch/arm64/boot/dts/realtek/rtd1861.dtsi
> > create mode 100644
> > arch/arm64/boot/dts/realtek/rtd1861b-krypton-8gb.dts
> > create mode 100644 arch/arm64/boot/dts/realtek/rtd1861b-krypton.dtsi
> > create mode 100644 arch/arm64/boot/dts/realtek/rtd1920.dtsi
> > create mode 100644
> > arch/arm64/boot/dts/realtek/rtd1920s-smallville-4gb.dts
> > create mode 100644
> > arch/arm64/boot/dts/realtek/rtd1920s-smallville.dtsi
> >
> > diff --git a/arch/arm64/boot/dts/realtek/Makefile
> > b/arch/arm64/boot/dts/realtek/Makefile
> > index ef8d8fcbaa05..0ef0596681ad 100644
> > --- a/arch/arm64/boot/dts/realtek/Makefile
> > +++ b/arch/arm64/boot/dts/realtek/Makefile
> > @@ -13,3 +13,8 @@ dtb-$(CONFIG_ARCH_REALTEK) += rtd1395-bpi-m4.dtb
> > dtb-$(CONFIG_ARCH_REALTEK) += rtd1395-lionskin.dtb
> >
> > dtb-$(CONFIG_ARCH_REALTEK) += rtd1619-mjolnir.dtb
> > +
> > +dtb-$(CONFIG_ARCH_REALTEK) += rtd1501s-phantom-8gb.dtb
> > +dtb-$(CONFIG_ARCH_REALTEK) += rtd1861b-krypton-8gb.dtb
> > +dtb-$(CONFIG_ARCH_REALTEK) += rtd1920s-smallville-4gb.dtb
>
> Keep things still ordered alphabetically.
>

I will fix it in V2.

> > +
> > diff --git a/arch/arm64/boot/dts/realtek/kent.dtsi
> > b/arch/arm64/boot/dts/realtek/kent.dtsi
> > new file mode 100644
> > index 000000000000..6af3efa0bda4
> > --- /dev/null
> > +++ b/arch/arm64/boot/dts/realtek/kent.dtsi
> > @@ -0,0 +1,179 @@
> > +// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
> > +/*
> > + * Realtek Kent SoC family
> > + *
> > + * Copyright (c) 2024 Realtek Semiconductor Corp.
> > + */
> > +
> > +#include <dt-bindings/interrupt-controller/arm-gic.h>
> > +#include <dt-bindings/interrupt-controller/irq.h>
> > +
> > +/ {
> > + interrupt-parent = <&gic>;
> > + #address-cells = <2>;
> > + #size-cells = <2>;
> > +
> > + aliases {
> > + serial0 = &uart0;
> > + };
> > +
> > + arch_timer: arch-timer {
>
> Node names should be generic. See also an explanation and list of examples
> (not exhaustive) in DT specification:
> https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-
> basics.html#generic-names-recommendation
> If you cannot find a name matching your device, please check in kernel
> sources for similar cases or you can grow the spec (via pull request to DT spec
> repo).
>

"arch_timer" will be renamed "timer".

> > + compatible = "arm,armv8-timer";
> > + interrupts = <GIC_PPI 13 IRQ_TYPE_LEVEL_LOW>,
> > + <GIC_PPI 14 IRQ_TYPE_LEVEL_LOW>,
> > + <GIC_PPI 11 IRQ_TYPE_LEVEL_LOW>,
> > + <GIC_PPI 10 IRQ_TYPE_LEVEL_LOW>,
> > + <GIC_PPI 9 IRQ_TYPE_LEVEL_HIGH>;
> > + };
> > +
> > + cpus {
> > + #address-cells = <1>;
> > + #size-cells = <0>;
> > +
> > + cpu0: cpu@0 {
> > + device_type = "cpu";
> > + compatible = "arm,cortex-a78";
> > + reg = <0x0>;
> > + enable-method = "psci";
> > + next-level-cache = <&l2_0>;
> > + dynamic-power-coefficient = <454>;
> > + #cooling-cells = <2>;
> > +
> > + l2_0: l2-cache {
> > + compatible = "cache";
> > + cache-level = <2>;
> > + cache-line-size = <64>;
> > + cache-sets = <256>;
> > + cache-size = <0x40000>;
> > + cache-unified;
> > + next-level-cache = <&l3>;
> > + };
> > + };
> > +
> > + cpu1: cpu@100 {
> > + device_type = "cpu";
> > + compatible = "arm,cortex-a78";
> > + reg = <0x100>;
> > + enable-method = "psci";
> > + next-level-cache = <&l2_1>;
> > + dynamic-power-coefficient = <454>;
> > + #cooling-cells = <2>;
> > +
> > + l2_1: l2-cache {
> > + compatible = "cache";
> > + cache-level = <2>;
> > + cache-line-size = <64>;
> > + cache-sets = <256>;
> > + cache-size = <0x40000>;
> > + cache-unified;
> > + next-level-cache = <&l3>;
> > + };
> > + };
> > +
> > + cpu2: cpu@200 {
> > + device_type = "cpu";
> > + compatible = "arm,cortex-a78";
> > + reg = <0x200>;
> > + enable-method = "psci";
> > + next-level-cache = <&l2_2>;
> > + dynamic-power-coefficient = <454>;
> > + #cooling-cells = <2>;
> > +
> > + l2_2: l2-cache {
> > + compatible = "cache";
> > + cache-level = <2>;
> > + cache-line-size = <64>;
> > + cache-sets = <256>;
> > + cache-size = <0x40000>;
> > + cache-unified;
> > + next-level-cache = <&l3>;
> > + };
> > + };
> > +
> > + cpu3: cpu@300 {
> > + device_type = "cpu";
> > + compatible = "arm,cortex-a78";
> > + reg = <0x300>;
> > + enable-method = "psci";
> > + next-level-cache = <&l2_3>;
> > + dynamic-power-coefficient = <454>;
> > + #cooling-cells = <2>;
> > +
> > + l2_3: l2-cache {
> > + compatible = "cache";
> > + cache-level = <2>;
> > + cache-line-size = <64>;
> > + cache-sets = <256>;
> > + cache-size = <0x40000>;
> > + cache-unified;
> > + next-level-cache = <&l3>;
> > + };
> > + };
> > +
> > + l3: l3-cache {
> > + compatible = "cache";
> > + cache-level = <3>;
> > + cache-line-size = <64>;
> > + cache-sets = <512>;
> > + cache-size = <0x00200000>;
> > + cache-unified;
> > + };
> > + };
> > +
> > + psci: psci {
> > + compatible = "arm,psci-1.0";
> > + method = "smc";
> > + };
> > +
> > + soc@0 {
> > + compatible = "simple-bus";
> > + #address-cells = <1>;
> > + #size-cells = <1>;
> > + ranges = <0x00000000 0x00000000 0x00000000
> 0x00040000>, /* boot code */
> > + <0x98000000 0x00000000 0x98000000
> 0x00ef0000>, /* reg-bus */
> > + <0xa0000000 0x00000000 0xa0000000
> 0x10000000>, /* PCIE */
> > + <0xff000000 0x00000000 0xff000000
> 0x00200000>;
> > + /* GIC */
> > +
> > + rbus: reg-bus@98000000 {
>
> Node names should be generic. See also an explanation and list of examples
> (not exhaustive) in DT specification:
> https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-
> basics.html#generic-names-recommendation
> If you cannot find a name matching your device, please check in kernel
> sources for similar cases or you can grow the spec (via pull request to DT spec
> repo).
>

"reg-bus" will be renamed "bus".

>
> > + compatible = "simple-bus";
> > + reg = <0x98000000 0x00ef0000>;
>
> This means it is not a simple-bus.

I accidentally exposed the "reg". Will remove it in V2.

> > + #address-cells = <1>;
> > + #size-cells = <1>;
> > + ranges = <0x00000000 0x98000000 0x00ef0000>,
> > + <0xa0000000 0xa0000000
> 0x10000000>; /*
> > + PCIE */
> > +
> > + iso: syscon@7000 {
> > + compatible = "realtek,iso-system",
> "syscon", "simple-mfd";
> > + reg = <0x7000 0x1000>;
> > + #address-cells = <1>;
> > + #size-cells = <1>;
> > + ranges = <0x0 0x7000 0x1000>;
>
> Please follow DTS coding style.

Will put "ranges" after "compatible" and "reg".

> > + reg-io-width = <4>;
> No children. You must post complete picture here.
>
> > + };
> > + };
> > +
> > + gic: interrupt-controller@ff100000 {
> > + compatible = "arm,gic-v3";
> > + reg = <0xff100000 0x10000>,
> > + <0xff140000 0x80000>;
> > + interrupt-controller;
> > + interrupts = <GIC_PPI 9 IRQ_TYPE_LEVEL_HIGH>;
> > + #address-cells = <1>;
> > + #interrupt-cells = <3>;
> > + #size-cells = <1>;
> > + };
> > + };
> > +};
> > +
> > +&iso {
>
> What are you overriding? There is no inclusion of other DTSI here.
>

I will fix it and move the content directly into the "iso" node.

> > + uart0: serial@800 {
> > + compatible = "snps,dw-apb-uart";
> > + reg = <0x800 0x100>;
> > + clock-frequency = <432000000>;
> > + interrupts = <GIC_SPI 68 IRQ_TYPE_LEVEL_HIGH>;
> > + reg-io-width = <4>;
> > + reg-shift = <2>;
> > + status = "disabled";
> > + };
> > +};
> > +
> > diff --git a/arch/arm64/boot/dts/realtek/rtd1501.dtsi
> > b/arch/arm64/boot/dts/realtek/rtd1501.dtsi
> > new file mode 100644
> > index 000000000000..1df5d9843505
> > --- /dev/null
> > +++ b/arch/arm64/boot/dts/realtek/rtd1501.dtsi
> > @@ -0,0 +1,13 @@
> > +// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
> > +/*
> > + * Realtek RTD1501 SoC
> > + *
> > + * Copyright (c) 2024 Realtek Semiconductor Corp.
> > + */
> > +
> > +#include "kent.dtsi"
> > +
> > +&uart0 {
> > + status = "okay";
> > +};
> > +
> > diff --git a/arch/arm64/boot/dts/realtek/rtd1501s-phantom-8gb.dts
> > b/arch/arm64/boot/dts/realtek/rtd1501s-phantom-8gb.dts
> > new file mode 100644
> > index 000000000000..b0e03f3731e2
> > --- /dev/null
> > +++ b/arch/arm64/boot/dts/realtek/rtd1501s-phantom-8gb.dts
> > @@ -0,0 +1,26 @@
> > +// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
> > +/*
> > + * Realtek RTD1501S Phantom EVB
> > + *
> > + * Copyright (c) 2024 Realtek Semiconductor Corp.
> > + */
> > +
> > +/dts-v1/;
> > +
> > +#include "rtd1501s-phantom.dtsi"
> > +
> > +/ {
> > + compatible = "realtek,phantom", "realtek,rtd1501s";
> > + model = "Realtek Phantom EVB Chromium (8GB)";
> > +
> > + memory: memory@40000 {
>
> Drop unused label.
>

I will fix it in V2.

> > + device_type = "memory";
> > + reg = <0x00000000 0x00050000 0x00000000 0x7ffb0000>,
>
> 0x0, don't inflate this.
>
> > + <0x00000000 0x8a100000 0x00000000
> 0x0def0000>,
> > + <0x00000000 0x98700000 0x00000000
> 0x07900000>,
> > + <0x00000000 0xa0600000 0x00000000
> 0x5ea00000>,
> > + <0x00000001 0x00000000 0x00000000
> 0xa0000000>,
>
> <0x1 0x00000000 0x0 0xa0000000>,
>
> > + <0x00000001 0xa0600000 0x00000000
> 0x5fa00000>;
> > + };
> > +};
> > +
> > diff --git a/arch/arm64/boot/dts/realtek/rtd1501s-phantom.dtsi
> > b/arch/arm64/boot/dts/realtek/rtd1501s-phantom.dtsi
> > new file mode 100644
> > index 000000000000..bf1e499addf9
> > --- /dev/null
> > +++ b/arch/arm64/boot/dts/realtek/rtd1501s-phantom.dtsi
> > @@ -0,0 +1,135 @@
> > +// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
> > +/*
> > + * Realtek RTD1501S Phantom EVB
> > + *
> > + * Copyright (c) 2024 Realtek Semiconductor Corp.
> > + */
> > +
> > +/dts-v1/;
> > +
> > +#include <dt-bindings/thermal/thermal.h> #include "rtd1501.dtsi"
> > +
> > +/ {
> > + chosen {
> > + bootargs = "earlycon=uart8250,mmio32,0x98007800
> > + console=ttyS0,460800 8250.nr_uarts=2
> init=/init
> > + loglevel=8 max_loop=64 loop.max_part=7
> > +
> > +firmware_class.path=/vendor/firmware/,/vendor/av_fw";
>
> NAK, drop all bootargs. None of above are suitable for mainline. Don't post all
> this android or custom initramfs stuff.
>

I will remove all custom bootargs and keep only 'earlycon=uart8250,mmio32,0x98007800'.

> > + stdout-path = "serial0:460800n8";
>
> And you already even have here console!
>
>
> > + };
> > +
> > + reserved_memory: reserved-memory {
> > + #address-cells = <2>;
> > + #size-cells = <2>;
> > + ranges;
> > +
> > + linux,cma {
> > + compatible = "shared-dma-pool";
> > + alignment = <0x0 0x00400000>;
> > + alloc-ranges = <0x0 0x00000000 0x0
> 0x20000000>;
> > + size = <0x0 0x02000000>;
> > + reusable;
> > + linux,cma-default;
> > + };
> > + };
> > +
> > + cpu_opps: opp-table-cpu {
> > + compatible = "operating-points-v2";
> > + opp-shared;
> > +
> > + opp800: opp-800000000 {
> > + opp-hz = /bits/ 64 <800000000>;
> > + opp-microvolt = <830000 830000 1100000>;
> > + status = "okay";
>
> Why? Where did you disable it?

You're right, I'll remove the 'status = "okay";' entry.

>
> ...
>
> Best regards,
> Krzysztof

Thank you for all your detailed replies and patience.
Yu-Chun