linux-kernel - Re: [PATCH 3/3] arm64: dts: meson: add support for the ODROID-N2+

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Date:   Tue, 21 Jul 2020 15:07:38 +0400
From:   Christian Hewitt <christianshewitt@...il.com>
To:     Jerome Brunet <jbrunet@...libre.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Kevin Hilman <khilman@...libre.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Dongjin Kim <tobetter@...dkernel.com>
Subject: Re: [PATCH 3/3] arm64: dts: meson: add support for the ODROID-N2+


> On 21 Jul 2020, at 1:14 pm, Jerome Brunet <jbrunet@...libre.com> wrote:
> 
> On Sun 19 Jul 2020 at 16:10, Christian Hewitt <christianshewitt@...il.com> wrote:
> 
>> HardKernel ODROID-N2+ uses an Amlogic S922X rev. C chip capable of higher
>> clock speeds than the original ODROID-N2. Hardkernel supports the big cpu
>> cluster at 2.4GHz and the little cpu cluster at 2.0GHz. Opp points and
>> regulator changess are from the HardKernel Linux kernel sources.
>> 
>> Suggested-by: Dongjin Kim <tobetter@...dkernel.com>
>> Signed-off-by: Christian Hewitt <christianshewitt@...il.com>
>> ---
>> arch/arm64/boot/dts/amlogic/Makefile          |  1 +
>> .../dts/amlogic/meson-g12b-odroid-n2-plus.dts | 53 +++++++++++++++++++
>> 2 files changed, 54 insertions(+)
>> create mode 100644 arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2-plus.dts
>> 
>> diff --git a/arch/arm64/boot/dts/amlogic/Makefile b/arch/arm64/boot/dts/amlogic/Makefile
>> index 5cac4d1d487d..6dc508b80133 100644
>> --- a/arch/arm64/boot/dts/amlogic/Makefile
>> +++ b/arch/arm64/boot/dts/amlogic/Makefile
>> @@ -8,6 +8,7 @@ dtb-$(CONFIG_ARCH_MESON) += meson-g12b-gtking-pro.dtb
>> dtb-$(CONFIG_ARCH_MESON) += meson-g12b-a311d-khadas-vim3.dtb
>> dtb-$(CONFIG_ARCH_MESON) += meson-g12b-s922x-khadas-vim3.dtb
>> dtb-$(CONFIG_ARCH_MESON) += meson-g12b-odroid-n2.dtb
>> +dtb-$(CONFIG_ARCH_MESON) += meson-g12b-odroid-n2-plus.dtb
>> dtb-$(CONFIG_ARCH_MESON) += meson-g12b-ugoos-am6.dtb
>> dtb-$(CONFIG_ARCH_MESON) += meson-gxbb-kii-pro.dtb
>> dtb-$(CONFIG_ARCH_MESON) += meson-gxbb-nanopi-k2.dtb
>> diff --git a/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2-plus.dts b/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2-plus.dts
>> new file mode 100644
>> index 000000000000..99e96be509f8
>> --- /dev/null
>> +++ b/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2-plus.dts
>> @@ -0,0 +1,53 @@
>> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
>> +/*
>> + * Copyright (c) 2019 BayLibre, SAS
>> + * Author: Neil Armstrong <narmstrong@...libre.com>
>> + */
>> +
>> +/dts-v1/;
>> +
>> +#include "meson-g12b-odroid-n2.dtsi"
>> +
>> +/ {
>> +	compatible = "hardkernel,odroid-n2-plus", "amlogic,s922x", "amlogic,g12b";
>> +	model = "Hardkernel ODROID-N2+";
>> +
>> +	vddcpu_a: regulator-vddcpu-a {
>> +		regulator-min-microvolt = <680000>;
>> +		regulator-max-microvolt = <1040000>;
>> +
>> +		pwms = <&pwm_ab 0 1500 0>;
>> +	};
>> +
>> +	vddcpu_b: regulator-vddcpu-b {
>> +		regulator-min-microvolt = <680000>;
>> +		regulator-max-microvolt = <1040000>;
>> +
>> +		pwms = <&pwm_AO_cd 1 1500 0>;
>> +	};
>> +
>> +	cpu_opp_table_0: opp-table-0 {
>> +		opp-1908000000 {
>> +			opp-hz = /bits/ 64 <1908000000>;
>> +			opp-microvolt = <1030000>;
>> +		};
>> +
>> +		opp-2016000000 {
>> +			opp-hz = /bits/ 64 <2016000000>;
>> +			opp-microvolt = <1040000>;
>> +		};
>> +	};
>> +
>> +	cpub_opp_table_1: opp-table-1 {
>> +		opp-2304000000 {
>> +			opp-hz = /bits/ 64 <2304000000>;
>> +			opp-microvolt = <1030000>;
>> +		};
>> +
>> +		opp-2400000000 {
>> +			opp-hz = /bits/ 64 <2400000000>;
>> +			opp-microvolt = <1040000>;
>> +		};
>> +	};
> 
> Are this opp specific to the N2+ or S922x rev C ?
> If it is the latter, shouldn't these be in s922x-revC dtsi ?

N2+ is currently the only known device with RevC chip (and shipping with
a huge heatsink) so we don’t know. I prefer to to put them in the board
dts for now and move to a common dtsi in the future once we’ve seen more
devices in the wild and proven they can handle the overclock.

Christian