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Date:   Thu, 23 Jul 2020 01:03:18 +0200
From:   Stefan Agner <stefan@agner.ch>
To:     Christian Hewitt <christianshewitt@gmail.com>
Cc:     Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Kevin Hilman <khilman@baylibre.com>,
        devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org,
        Dongjin Kim <tobetter@hardkernel.com>
Subject: Re: [PATCH 3/3] arm64: dts: meson: add support for the ODROID-N2+
In-Reply-To: <20200719141034.8403-4-christianshewitt@gmail.com>
References: <20200719141034.8403-1-christianshewitt@gmail.com>
 <20200719141034.8403-4-christianshewitt@gmail.com>
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Hi Christian,

On 2020-07-19 16:10, Christian Hewitt 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.

According to the ODROID wiki those values are already in the
overclocking range:
https://wiki.odroid.com/odroid-n2/hardware/overclocking

From what I can tell, for ODROID-N2 upstream Linux so far used defaults
from meson-g12b-s922x.dtsi, which were 1896MHz for the A53 and 1704MHz
for the A73 (so it seems currently the A73 running even 100MHz below
"Stock").

I guess we should pick either Stock or Overclock for the two models.
Unless there is another good reason not to?

--
Stefan

> 
> Suggested-by: Dongjin Kim <tobetter@hardkernel.com>
> Signed-off-by: Christian Hewitt <christianshewitt@gmail.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@baylibre.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>;
> +		};
> +	};
> +};
> +