linux-kernel - ARM: dts: sun9i: Allwinner A80 dtsi - missing clock-frequency property

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <54A34538.2020802@gmx.de>
Date:	Wed, 31 Dec 2014 01:37:12 +0100
From:	Heinrich Schuchardt <xypron.glpk@....de>
To:	Chen-Yu Tsai <wens@...e.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>
CC:	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	Shuge <shuge@...winnertech.com>,
	Meng Zhang <kevin@...winnertech.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: ARM: dts: sun9i: Allwinner A80 dtsi - missing clock-frequency property

When booting Linux 3.19-rc2 on a Merrii Optimusboard using 
arch/arm/boot/dts/sun9i-a80-optimus.dts adn 
arch/arm/boot/dts/sun9i-a80.dtsi I get errors
[    0.061192] /cpus/cpu@0 missing clock-frequency property
[    0.061209] /cpus/cpu@1 missing clock-frequency property
[    0.061223] /cpus/cpu@2 missing clock-frequency property
[    0.061237] /cpus/cpu@3 missing clock-frequency property
[    0.061251] /cpus/cpu@100 missing clock-frequency property
[    0.061266] /cpus/cpu@101 missing clock-frequency property
[    0.061283] /cpus/cpu@102 missing clock-frequency property
[    0.061300] /cpus/cpu@103 missing clock-frequency property

The dtsi was provided by patch
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=4ab328f06e305bf3ea254f4e3c94bb4d820998c1

According to file pack/chips/sun9iw1p1/optimus/sys_config.fex supplied 
in the OptimusBoard SDK the big cluster can run at up to 1800 MHz, and
the LITTLE cluster can run at up to 1200 MHz,depending on the CPU voltage:

big
1.08V (1608Mhz, 1800Mhz]
1.00V (1536Mhz, 1608Mhz]
0.96V (1440Mhz, 1536Mhz]
0.90V (1296Mhz, 1440Mhz]
0.84V (   0Mhz, 1296Mhz]

LITTLE
1.02V (1128Mhz, 1200Mhz]
0.96V (1008Mhz, 1128Mhz]
0.90V ( 864Mhz, 1008Mhz]
0.84V (   0Mhz,  864Mhz]

I guess the proper way to specify the data is the one described in
Documentation/devicetree/bindings/cpufreq/arm_big_little_dt.txt

Other boards might run at other frequencies. Hence we might want to put 
this information into the board file
arch/arm/boot/dts/sun9i-a80-optimus.dts.

Documentation/devicetree/bindings/cpufreq/arm_big_little_dt.txt,
arch/arm/boot/dts/exynos5260.dtsi, and
arch/arm/boot/dts/exynos5420.dtsi, all assume that
cpu@...pu@3 are A15 (big) and cpu@...-cpu@103 are A7 (LITTLE).

Shouldn't arch/arm/boot/dts/sun9i-a80.dtsi stick to this convention?

The scripts to create the uImage and to reproduce the problem are in
https://github.com/xypron/kernel-optimusboard/tree/35d06c020f6584b5023e0e4bef67cc5a625f65bb

Best regards

Heinrich Schuchardt


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/