linux-kernel - Re: [PATCH v10 2/3] power-domain: rockchip: add power doamin driver

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]

Date:	Tue, 11 Nov 2014 08:53:13 -0800
From:	Kevin Hilman <khilman@...nel.org>
To:	Caesar Wang <caesar.wang@...k-chips.com>
Cc:	linus.walleij@...aro.org, linux-arm-kernel@...ts.infradead.org,
	Heiko Stuebner <heiko@...ech.de>,
	Russell King <linux@....linux.org.uk>,
	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>,
	Grant Likely <grant.likely@...aro.org>,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	Randy Dunlap <rdunlap@...radead.org>,
	linux-doc@...r.kernel.org, dianders@...omium.org,
	linux-rockchip@...ts.infradead.org,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	fzf@...k-chips.com, cf@...k-chips.com,
	Jack Dai <jack.dai@...k-chips.com>,
	"jinkun.hong" <jinkun.hong@...k-chips.com>
Subject: Re: [PATCH v10 2/3] power-domain: rockchip: add power doamin driver

Caesar Wang <caesar.wang@...k-chips.com> writes:

> In order to meet high performance and low power requirements, a power
> management unit is designed or saving power when RK3288 in low power mode.
> The RK3288 PMU is dedicated for managing the power ot the whole chip.
>
> Signed-off-by: Jack Dai <jack.dai@...k-chips.com>
> Signed-off-by: jinkun.hong <jinkun.hong@...k-chips.com>
> Signed-off-by: Caesar Wang <caesar.wang@...k-chips.com>
>
> ---
>
> Changes in v10:
>     - this switches over domain infos to use masks instead of recomputing
>       them each time and also gets rid of custom domain translator and
>       uses standard onecell on.
>
> Changes in v9:
>     - fix v8 changes as follows:
>     - This reconciles the v2 and v7 code so that we power domain have
>       lists of clocks they toggle on and off during power transitions and
>       independently from power domains clocks we attach clocks to devices
>       comprising power domain and prepare them so they are turn on and off
>       by runtime PM.

I still don't like having lists of clocks in the power-domain DT. 

DT is supposed to describe the hardware, and clocks are properties of
devices, not power-domains, so the DT description should follow from that.

I understand that some device may not be probed etc. when a power-domain
needs to transition, but the power-domain driver can still get the list
of clocks it needs from the device nodes within the domain, so it
shouldn't matter whether devices are probed or not.

Kevin
--
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/