linux-kernel - Re: [PATCH 2/2] clk: core: link consumer with clock driver

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Date:   Fri, 30 Nov 2018 11:20:52 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Stephen Boyd <sboyd@...nel.org>
Cc:     kbuild test robot <lkp@...el.com>, kbuild-all@...org,
        Michael Turquette <mturquette@...libre.com>,
        Russell King <linux@...linux.org.uk>,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Antoine Tenart <antoine.tenart@...tlin.com>,
        Maxime Chevallier <maxime.chevallier@...tlin.com>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Nadav Haklai <nadavh@...vell.com>
Subject: Re: [PATCH 2/2] clk: core: link consumer with clock driver

Hi Stephen,

Stephen Boyd <sboyd@...nel.org> wrote on Fri, 30 Nov 2018 01:26:20
-0800:

> Quoting Miquel Raynal (2018-11-23 01:11:32)
> > Would you agree with me adding dummy functions in the #else section
> > like:
> > 
> > static inline void __clk_device_link(struct device *consumer, struct clk *clk)
> > {
> >        return;
> > }
> > 
> > static inline void __clk_device_unlink(struct clk *clk)
> > {
> >        return;
> > }
> > 
> > Do you want me to also declare these functions in the #if section
> > (with the external keyword) to balance the above declarations?  
> 
> Why can't we do the linking in __clk_get() and __clk_put()?
> 

Because we need the caller's 'struct device' to make the link and
this is not available in __clk_get(). I tried to ad it as parameter but
I don't think it is possible to retrieve a 'struct device' from the
device name. The functions where this is problematic are:
* clk.c:__of_clk_get_from_provider()
* clkdev.c:clk_get_sys()

By the way in my new version I called the helpers:
* clk_{link,unlink}_hierarchy()
* clk_{link,unlink}_consumer()

I will send a new version with these helpers, but if you have anything
in mind to help me achieve the above request, I will welcome the idea.


Thanks,
Miquèl