Hi Geert!
On Thu, 2014-09-11 at 10:51 +0200, Geert Uytterhoeven wrote:
> Hi Maciej,
>
> On Wed, Sep 10, 2014 at 1:28 PM, Maciej Matraszek
> <m.matras...@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.matras...@samsung.com>
>
> Tested-by: Geert Uytterhoeven <geert+rene...@glider.be>
Thanks for testing, Geert, I'm glad you like it :)!
BTW Can I use your output as example in the commit message for v2?
It's much more informative (though 'runtime status' alignment seems
odd).
>
> Gr{oetje,eeting}s,
>
> Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 --
> ge...@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
--
Maciej Matraszek
Samsung R&D Institute Poland
Samsung Electronics
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