lkml.org 
[lkml]   [2015]   [Apr]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 2/4] soc: Mediatek: Add SCPSYS power domain driver
On Tue, Mar 31, 2015 at 09:27:53AM -0700, Kevin Hilman wrote:
> Hi Sascha,
>
> Sascha Hauer <s.hauer@pengutronix.de> writes:
>
> > This adds a power domain driver for the Mediatek SCPSYS unit.
> >
> > The System Control Processor System (SCPSYS) has several power
> > management related tasks in the system. The tasks include thermal
> > measurement, dynamic voltage frequency scaling (DVFS), interrupt
> > filter and lowlevel sleep control. The System Power Manager (SPM)
> > inside the SCPSYS is for the MTCMOS power domain control.
> >
> > For now this driver only adds power domain support, the more
> > advanced features are not yet supported. The driver implements
> > the generic PM domain device tree bindings, the first user will
> > most likely be the Mediatek AFE audio driver.
> >
> > Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
>
> Sorry for the lag, was travelling last week at ELC and not keeping up
> with reviews.
>
> This version looks pretty good to me, but had one minor
> comment/question...
>
> [...]
>
> > +#define NUM_DOMAINS ARRAY_SIZE(scp_domain_data)
> > +
> > +struct scp;
> > +
> > +struct scp_domain {
> > + struct generic_pm_domain pmd;
> > + struct scp_domain_data *data;
> > + struct scp *scp;
> > +};
> > +
> > +struct scp {
> > + struct scp_domain domains[NUM_DOMAINS];
> > + struct generic_pm_domain *pmd[NUM_DOMAINS];
>
> Why is this genpd pointer needed? It's just a pointer to the
> .domains.pmd[i] anyways, and IMO makes the code a bit hard to follow.

The driver itself does not need the genpd pointer, but
of_genpd_add_provider_onecell() expects an array of pointers to struct
generic_pm_domain.

I can allocate the array of pointers separately and remove the pmd field
from struct scp to make this a bit more clearer.

Sascha

--
Pengutronix e.K. | |
Industrial Linux Solutions | http://www.pengutronix.de/ |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |


\
 
 \ /
  Last update: 2015-04-13 13:01    [W:0.101 / U:0.268 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site