Re: [RFC PATCH 2/2] arm64: dts: add support for C3 based Amlogic AW409

xianwei.zhao
2023-04-27T09:26:31Z

Hi Krzysztof,
Thank you for your reply.

On 2023/4/19 15:48, Krzysztof Kozlowski wrote:
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> On 19/04/2023 09:38, =Xianwei Zhao wrote:
>> From: Xianwei Zhao <xianwei.zhao@amlogic.com>
>>
>> Amlogic C3 is an advanced edge AI processor designed for smart IP camera
>> applications.
>>
>> Add basic support for the C3 based Amlogic AW409 board, which describes
>> the following components: CPU, GIC, IRQ, Timer, UART. It's capable of
>> booting up into the serial console.
>>
>> Signed-off-by: Xianwei Zhao <xianwei.zhao@amlogic.com>
>> ---
>> arch/arm64/boot/dts/amlogic/Makefile | 1 +
>> .../amlogic/amlogic-c3-c302x-aw409-256m.dts | 30 +++++++
>> arch/arm64/boot/dts/amlogic/amlogic-c3.dtsi | 87 +++++++++++++++++++
>> 3 files changed, 118 insertions(+)
>> create mode 100644 arch/arm64/boot/dts/amlogic/amlogic-c3-c302x-aw409-256m.dts
>> create mode 100644 arch/arm64/boot/dts/amlogic/amlogic-c3.dtsi
>>
>> diff --git a/arch/arm64/boot/dts/amlogic/Makefile b/arch/arm64/boot/dts/amlogic/Makefile
>> index cd1c5b04890a..d2b5d0d750bc 100644
>> --- a/arch/arm64/boot/dts/amlogic/Makefile
>> +++ b/arch/arm64/boot/dts/amlogic/Makefile
>> @@ -74,3 +74,4 @@ dtb-$(CONFIG_ARCH_MESON) += meson-sm1-odroid-hc4.dtb
>> dtb-$(CONFIG_ARCH_MESON) += meson-sm1-sei610.dtb
>> dtb-$(CONFIG_ARCH_MESON) += meson-sm1-x96-air-gbit.dtb
>> dtb-$(CONFIG_ARCH_MESON) += meson-sm1-x96-air.dtb
>> +dtb-$(CONFIG_ARCH_AMLIPC) += amlogic-c3-c302x-aw409-256m.dtb
>> diff --git a/arch/arm64/boot/dts/amlogic/amlogic-c3-c302x-aw409-256m.dts b/arch/arm64/boot/dts/amlogic/amlogic-c3-c302x-aw409-256m.dts
>> new file mode 100644
>> index 000000000000..38ca98a32181
>> --- /dev/null
>> +++ b/arch/arm64/boot/dts/amlogic/amlogic-c3-c302x-aw409-256m.dts
>> @@ -0,0 +1,30 @@
>> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
>> +/*
>> + * Copyright (c) 2021 Amlogic, Inc. All rights reserved.
>> + */
>> +
>> +/dts-v1/;
>> +
>> +#include "amlogic-c3.dtsi"
>> +
>> +/ {
>> + model = "Amlogic C302 aw409 Development Board";
>> + compatible = "amlogic,aw409", "amlogic,c3";
>
> Undocumented compatibles. Run checkpatch and fix all warnings. Anyway, I
> am not sure this warrants separate architecture. Isn't C3 standard Meson
> SoC?
>
The patch related to bindings is committed, see:
https://lore.kernel.org/all/20230407102704.1055152-1-kelvin.zhang@amlogic.com/
>> + interrupt-parent = <&gic>;
>> + #address-cells = <2>;
>> + #size-cells = <2>;
>> +
>> + aliases {
>> + serial0 = &uart_B;
>> + };
>> +
>> + memory@0 {
>> + device_type = "memory";
>> + reg = <0x0 0x0 0x0 0x10000000>;
>> + };
>> +
>
> Drop stray blank lines.
>
will do
>> +};
>> +
>> +&uart_B {
>> + status = "okay";
>> +};
>> diff --git a/arch/arm64/boot/dts/amlogic/amlogic-c3.dtsi b/arch/arm64/boot/dts/amlogic/amlogic-c3.dtsi
>> new file mode 100644
>> index 000000000000..c69072ac57f5
>> --- /dev/null
>> +++ b/arch/arm64/boot/dts/amlogic/amlogic-c3.dtsi
>> @@ -0,0 +1,87 @@
>> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
>> +/*
>> + * Copyright (c) 2021 Amlogic, Inc. All rights reserved.
>> + */
>> +
>> +#include <dt-bindings/interrupt-controller/irq.h>
>> +#include <dt-bindings/interrupt-controller/arm-gic.h>
>> +#include <dt-bindings/gpio/gpio.h>
>> +
>> +/ {
>> + cpus {
>> + #address-cells = <2>;
>> + #size-cells = <0>;
>> +
>> + cpu0: cpu@0 {
>> + device_type = "cpu";
>> + compatible = "arm,cortex-a35";
>> + reg = <0x0 0x0>;
>> + enable-method = "psci";
>> + };
>> +
>> + cpu1: cpu@1 {
>> + device_type = "cpu";
>> + compatible = "arm,cortex-a35";
>> + reg = <0x0 0x1>;
>> + enable-method = "psci";
>> + };
>> +
>
> Everywhere...
>
will do
>> + };
>> +
>> + timer {
>> + compatible = "arm,armv8-timer";
>> + interrupts = <GIC_PPI 13 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
>> + <GIC_PPI 14 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
>> + <GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
>> + <GIC_PPI 10 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>;
>> + };
>> +
>> + psci {
>> + compatible = "arm,psci-1.0";
>> + method = "smc";
>> + };
>> +
>> + xtal: xtal-clk {
>> + compatible = "fixed-clock";
>> + clock-frequency = <24000000>;
>> + clock-output-names = "xtal";
>> + #clock-cells = <0>;
>> + };
>> +
>> + soc {
>> + compatible = "simple-bus";
>> + #address-cells = <2>;
>> + #size-cells = <2>;
>> + ranges;
>> +
>> + gic: interrupt-controller@fff01000 {
>> + compatible = "arm,gic-400";
>> + #interrupt-cells = <3>;
>> + #address-cells = <0>;
>> + interrupt-controller;
>> + reg = <0x0 0xfff01000 0 0x1000>,
>> + <0x0 0xfff02000 0 0x2000>,
>> + <0x0 0xfff04000 0 0x2000>,
>> + <0x0 0xfff06000 0 0x2000>;
>> + interrupts = <GIC_PPI 9 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_HIGH)>;
>> + };
>> +
>> + apb4: apb4@fe000000 {
>
> Node names should be generic.
> https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation
>
will do
>> + compatible = "simple-bus";
>> + reg = <0x0 0xfe000000 0x0 0x480000>;
>> + #address-cells = <2>;
>> + #size-cells = <2>;
>> + ranges = <0x0 0x0 0x0 0xfe000000 0x0 0x480000>;
>> +
>> + uart_B: serial@7a000 {
>
> lowercase for labels
>
will do
>> + compatible = "amlogic,meson-g12a-uart";
>
> So this is just meson? Drop new ARCH, no need for it. Anyway, you need
> SoC specific compatible.
>
> Best regards,
> Krzysztof