linux-kernel - Re: [PATCH] clk: qcom: Make oxili GDSC parent of oxili

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Date:	Thu, 1 Oct 2015 12:06:39 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Rajendra Nayak <rnayak@...eaurora.org>
Cc:	Mike Turquette <mturquette@...libre.com>,
	linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH] clk: qcom: Make oxili GDSC parent of oxili_cx GDSC

On 10/01, Stephen Boyd wrote:
> On 10/01, Rajendra Nayak wrote:
> > On 09/24/2015 12:39 AM, Stephen Boyd wrote:
> > >+
> > >+	ret = pm_genpd_add_subdomain(&oxili_gdsc.pd, &oxilicx_gdsc.pd);
> > 
> > We'll need pm_genpd_add_subdomain() to be EXPORT_SYMBOL_GPL'ed so
> > clk-qcom can be built as a module.
> 
> Good catch! Do we need to call pm_genpd_remove_subdomain() too?

Looks like yes.

> 
> > 
> > It would also be nicer if this parent/child relationship can
> > somehow be represented in data (struct gdsc) that gets passed to
> > the gdsc driver which then sets it up, instead of individual
> > clock drivers doing it.
> 
> Agreed. I'd rather that we do nothing besides register domains
> and then let the core code handle hooking up domains and
> subdomains.

A little closer inspection makes me want to skip this. PM domains
can have multiple "master" domains, and pm_genpd_init() is the
only API that would be able to do the linking. That API is mostly
about initializing things to default values, so it doesn't seem
like a good fit. I'll send a v2 with the remove part and the
exports.

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