From: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
To: Neil Armstrong <narmstrong@baylibre.com>
Cc: khilman@baylibre.com, linux-kernel@vger.kernel.org,
linux-gpio@vger.kernel.org, linux-amlogic@lists.infradead.org,
linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
jbrunet@baylibre.com
Subject: Re: [RFC/RFT v3 14/14] arm64: dts: meson-g12b-odroid-n2: enable DVFS
Date: Wed, 3 Jul 2019 01:45:55 +0200 [thread overview]
Message-ID: <CAFBinCA5-5kbD-0e7Lm7FwRneWsKeW4yQrucd1PAk=s2PrtxJQ@mail.gmail.com> (raw)
In-Reply-To: <20190701091258.3870-15-narmstrong@baylibre.com>
On Mon, Jul 1, 2019 at 11:13 AM Neil Armstrong <narmstrong@baylibre.com> wrote:
>
> Enable DVFS for the Odroid-N2 by setting the clock, OPP and supply
> for each cores of each CPU clusters.
>
> The first cluster uses the "VDDCPU_B" power supply, and the second
> cluster uses the "VDDCPU_A" power supply.
>
> Each power supply can achieve 0.73V to 1.01V using 2 distinct PWM
> outputs clocked at 800KHz with an inverse duty-cycle.
>
> DVFS has been tested by running the arm64 cpuburn at [1] and cycling
> between all the possible cpufreq translations of each cluster and
> checking the final frequency using the clock-measurer, script at [2].
>
> [1] https://github.com/ssvb/cpuburn-arm/blob/master/cpuburn-a53.S
> [2] https://gist.github.com/superna9999/d4de964dbc0f84b7d527e1df2ddea25f
>
> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
[...]
> + vddcpu_b: regulator-vddcpu-b {
> + /*
> + * Silergy SY8120B1ABC Regulator.
> + */
interesting that they use different regulator ICs for CPU A and CPU B
the public schematics confirm your comments
_______________________________________________
linux-amlogic mailing list
linux-amlogic@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-amlogic
next prev parent reply other threads:[~2019-07-02 23:46 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-01 9:12 [RFC/RFT v3 00/14] arm64: g12a: add support for DVFS Neil Armstrong
2019-07-01 9:12 ` [RFC/RFT v3 01/14] pinctrl: meson-g12a: add pwm_a on GPIOE_2 pinmux Neil Armstrong
2019-07-02 22:56 ` Martin Blumenstingl
2019-07-01 9:12 ` [RFC/RFT v3 02/14] clk: core: introduce clk_hw_set_parent() Neil Armstrong
2019-07-02 23:05 ` Martin Blumenstingl
2019-07-01 9:12 ` [RFC/RFT v3 03/14] clk: meson: regmap: export regmap_div ops functions Neil Armstrong
2019-07-01 9:12 ` [RFC/RFT v3 04/14] clk: meson: eeclk: add setup callback Neil Armstrong
2019-07-02 23:16 ` Martin Blumenstingl
2019-07-03 11:45 ` Neil Armstrong
2019-07-03 12:40 ` Jerome Brunet
2019-07-03 12:57 ` Martin Blumenstingl
2019-07-03 14:17 ` Jerome Brunet
2019-07-26 14:50 ` Neil Armstrong
2019-07-29 7:42 ` Jerome Brunet
2019-07-01 9:12 ` [RFC/RFT v3 05/14] soc: amlogic: meson-clk-measure: protect measure with a mutex Neil Armstrong
2019-07-02 23:01 ` Martin Blumenstingl
2019-07-01 9:12 ` [RFC/RFT v3 06/14] soc: amlogic: meson-clk-measure: add G12B second cluster cpu clk Neil Armstrong
2019-07-02 22:58 ` Martin Blumenstingl
2019-07-01 9:12 ` [RFC/RFT v3 07/14] clk: meson: g12a: add notifiers to handle cpu clock change Neil Armstrong
2019-07-02 23:28 ` Martin Blumenstingl
2019-07-03 11:50 ` Neil Armstrong
2019-08-08 4:43 ` Stephen Boyd
2019-07-01 9:12 ` [RFC/RFT v3 08/14] clk: meson: g12a: expose CPUB clock ID for G12B Neil Armstrong
2019-07-02 23:03 ` Martin Blumenstingl
2019-07-01 9:12 ` [RFC/RFT v3 09/14] arm64: dts: move common G12A & G12B modes to meson-g12-common.dtsi Neil Armstrong
2019-07-02 23:54 ` Martin Blumenstingl
2019-07-03 11:51 ` Neil Armstrong
2019-07-03 12:48 ` Jerome Brunet
2019-07-01 9:12 ` [RFC/RFT v3 10/14] arm64: dts: meson-g12-common: add pwm_a on GPIOE_2 pinmux Neil Armstrong
2019-07-02 23:11 ` Martin Blumenstingl
2019-07-01 9:12 ` [RFC/RFT v3 11/14] arm64: dts: meson-g12a: add cpus OPP table Neil Armstrong
2019-07-02 23:47 ` Martin Blumenstingl
2019-07-03 11:53 ` Neil Armstrong
2019-07-03 12:12 ` Martin Blumenstingl
2019-07-01 9:12 ` [RFC/RFT v3 12/14] arm64: dts: meson-g12a: enable DVFS on G12A boards Neil Armstrong
2019-07-02 23:43 ` Martin Blumenstingl
2019-07-01 9:12 ` [RFC/RFT v3 13/14] arm64: dts: meson-g12b: add cpus OPP tables Neil Armstrong
2019-07-01 9:12 ` [RFC/RFT v3 14/14] arm64: dts: meson-g12b-odroid-n2: enable DVFS Neil Armstrong
2019-07-02 23:45 ` Martin Blumenstingl [this message]
2019-07-03 11:54 ` Neil Armstrong
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='CAFBinCA5-5kbD-0e7Lm7FwRneWsKeW4yQrucd1PAk=s2PrtxJQ@mail.gmail.com' \
--to=martin.blumenstingl@googlemail.com \
--cc=jbrunet@baylibre.com \
--cc=khilman@baylibre.com \
--cc=linux-amlogic@lists.infradead.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-clk@vger.kernel.org \
--cc=linux-gpio@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=narmstrong@baylibre.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).