> -----Original Message-----
> From: "Högander" Jouni [mailto:[EMAIL PROTECTED]
> Sent: Wednesday, August 13, 2008 12:47 PM
> To: ext Rajendra Nayak
> Cc: [email protected]
> Subject: Re: [PATCH 04/10] OMAP3 SRF: OMAP PM srf implementation
>
> Hello Rajendra,
>
> "ext Rajendra Nayak" <[EMAIL PROTECTED]> writes:
>
> > +/*
> > + * Powerdomain usecounting hooks
> > + */
> > +
> > +void omap_pm_pwrdm_active(struct powerdomain *pwrdm) {
> > + char *res_name;
> > +
> > + if (!pwrdm) {
> > + WARN_ON(1);
> > + return;
> > + };
> > +
> > + if (!strcmp(pwrdm->name, "wkup_pwrdm") ||
> > + !strcmp(pwrdm->name, "core_pwrdm"))
> > + return;
> > +
> > + pr_debug("OMAP PM: powerdomain %s is becoming active\n",
> > +pwrdm->name);
> > +
> > + res_name = get_lat_res_name(pwrdm->name);
> > + /* Request for a zero latency which puts the Power
> Domain in ON state*/
> > + resource_request(res_name, &omap_pm_dev, 0);
> > + return;
> > +}
> > +
> > +void omap_pm_pwrdm_inactive(struct powerdomain *pwrdm) {
> > + char *res_name;
> > +
> > + if (!pwrdm) {
> > + WARN_ON(1);
> > + return;
> > + };
> > +
> > + if (!strcmp(pwrdm->name, "wkup_pwrdm") ||
> > + !strcmp(pwrdm->name, "core_pwrdm"))
> > + return;
> > +
> > + pr_debug("OMAP PM: powerdomain %s is becoming inactive\n",
> > + pwrdm->name);
> > +
> > + res_name = get_lat_res_name(pwrdm->name);
> > + /* Release the latency requested */
> > + resource_release(res_name, &omap_pm_dev);
> > + return;
> > +}
>
> For what these two functions are? Why they are
> requesting/releasing resource?
Its needed so that a power domain is turned ON while the first clock node in it
is
requested, and turned OFF while the last clock node is disabled.
>
> > +
> > +/*
> > + * Should be called before clk framework since clk fw will call
> > + * omap_pm_pwrdm_{in,}active()
> > + */
> > +int __init omap_pm_if_early_init(void) {
> > + return 0;
> > +}
>
> Why clock framework (omap2_clkdm_clk_enable/disable) is
> calling omap_pm_pwrdm_{in,}active()? Is it for keeping track
> of OFF transitions?
This is for clockdomain layer to indicate that a powerdomain should wake up or
be put to sleep
>
> --
> Jouni Högander
>
>
>
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