Messages in this thread | | | Date | Thu, 11 Sep 2014 10:51:11 +0200 | Subject | Re: [PATCH] PM / Domains: add debugfs listing of struct generic_pm_domain-s | From | Geert Uytterhoeven <> |
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Hi Maciej,
On Wed, Sep 10, 2014 at 1:28 PM, Maciej Matraszek <m.matraszek@samsung.com> wrote: > Add /sys/kernel/debug/pm_genpd/pm_genpd_summary file, which > lists power domains in the system, their statuses and attached devices, > resembling /sys/kernel/debug/clk/clk_summary. > > Currently it is impossible to inspect (from userland) whether > a power domain is on or off. And, if it is on, which device blocks it > from powering down. This change allows developers working on > embedded devices power efficiency to list all necessary information > about generic power domains in one place.
Thanks, this is _very_ useful!
> The content of pm_genpd/pm_genpd_summary file is generated by iterating > over all generic power domain in the system, and, for each, > over registered devices.
... and over the subdomains, if present.
I can confirm that part is working, too, cfr. the slaves column on r8a7740
domain status slaves /device runtime status ---------------------------------------------------------------------- a4su off a3sg off a3sm on a3sp on /devices/e6600000.pwm suspended /devices/e6c50000.serial active /devices/e6850000.sd suspended /devices/e6bd0000.mmc active a4s on a3sp, a3sm, a3sg /devices/e6900000.irqpin unsupported /devices/e6900004.irqpin unsupported /devices/e6900008.irqpin unsupported /devices/e690000c.irqpin unsupported /devices/e9a00000.ethernet active a3rv off a4r off a3rv /devices/fff20000.i2c suspended a4lc off c5 on a4lc, a4r, a4s, a4su /devices/e6050000.pfc unsupported /devices/e6138000.timer active
> Signed-off-by: Maciej Matraszek <m.matraszek@samsung.com>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Gr{oetje,eeting}s,
Geert
-- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
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