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SubjectRe: [PATCH] PM / Domains: add debugfs listing of struct generic_pm_domain-s
Hi Maciej,

On Wed, Sep 10, 2014 at 1:28 PM, Maciej Matraszek
<> 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/ 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 <>

Tested-by: Geert Uytterhoeven <>



Geert Uytterhoeven -- There's lots of Linux beyond ia32 --

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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