Date: Fri, 22 Dec 2017 10:51:47 +0800
From: Dong Aisheng <dongas86@gmail.com>
To: Stephen Boyd <sboyd@codeaurora.org>
Cc: Dong Aisheng <aisheng.dong@nxp.com>, linux-clk@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        mturquette@baylibre.com, shawnguo@kernel.org, s.nawrocki@samsung.com,
        geert@linux-m68k.org, Russell King <linux@arm.linux.org.uk>
Subject: Re: [PATCH V4 1/1] clk: bulk: add of_clk_bulk_get()
Message-ID: <20171222025147.GB24403@b29396-OptiPlex-7040>
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 <20170929224821.GM457@codeaurora.org>
 <20171220135330.GA30461@b29396-OptiPlex-7040>
 <20171221232032.GD7997@codeaurora.org>
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On Thu, Dec 21, 2017 at 03:20:32PM -0800, Stephen Boyd wrote:
> On 12/20, Dong Aisheng wrote:
> > On Fri, Sep 29, 2017 at 03:48:21PM -0700, Stephen Boyd wrote:
> > > On 09/26, Dong Aisheng wrote:
> > > > here to handle this for DT users without 'clock-names' specified.
> > 
> > > > +#endif
> > > >  
> > > >  void clk_bulk_put(int num_clks, struct clk_bulk_data *clks)
> > > >  {
> > > > diff --git a/include/linux/clk.h b/include/linux/clk.h
> > > > index 12c96d9..073cb3b 100644
> > > > --- a/include/linux/clk.h
> > > > +++ b/include/linux/clk.h
> > > > @@ -680,10 +680,18 @@ static inline void clk_bulk_disable_unprepare(int num_clks,
> > > >  }
> > > >  
> > > >  #if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK)
> > > > +int __must_check of_clk_bulk_get(struct device_node *np, int num_clks,
> > > > +				 struct clk_bulk_data *clks);
> > > >  struct clk *of_clk_get(struct device_node *np, int index);
> > > >  struct clk *of_clk_get_by_name(struct device_node *np, const char *name);
> > > >  struct clk *of_clk_get_from_provider(struct of_phandle_args *clkspec);
> > > >  #else
> > > > +static inline int of_clk_bulk_get(struct device_node *np, int num_clks,
> > > 
> > > Do we need __must_check here too?
> > 
> > Yes, you're absolutely right.
> > 
> > of_clk_bulk_get is special as it returns error, so should add __must_check.
> > 
> > > We should do the same for the
> > > other bulk get APIs. Seems we missed that part last time.
> > > 
> > 
> > Currently for !CONFIG_HAVE_CLK case, all APIs return 0.
> > !CONFIG_HAVE_CLK
> > clk_bulk_get		return 0
> > devm_clk_bulk_get	return 0
> > clk_bulk_enable		return 0
> > clk_bulk_prepare	return 0
> > 
> > Do you think we still need add __must_check for them?
> 
> Yes, we need it even when !CONFIG_HAVE_CLK because it allows us
> to catch missing checking return values in the non-clk compile
> configurations too. More test coverage.
> 

Ok, understand.
May cook a patch to fix them.

> > 
> > And for CONFIG_HAVE_CLK case, all __must_check already added.
> > 
> > int __must_check clk_bulk_get
> > int __must_check devm_clk_bulk_get
> > int __must_check clk_bulk_enable
> > int __must_check clk_bulk_prepare
> > 
> > And no need for void function.
> > void clk_bulk_put
> > void clk_bulk_unprepare
> > void clk_bulk_disable
> > 
> > > I'll fix all these things up when applying.
> > > 
> > 
> > I did not see this in latest tree.
> > Suppose i should resend it with above things fixed, right?
> > 
> 
> I dropped it because it seems like maybe we don't need
> of_clk_bulk_get(), but more like clk_get_all() or something like
> that to acquire all clks for a device. It seems like it isn't DT
> specific, and so we should just provide the "all" API instead of
> some DT specific one that needs to know how many clks to get. I
> think I sent a similar reply on some other thread and added you
> to it.
> 

I probably missed it before.
Will check later.

Thanks for reminder.

Regards
Dong Aisheng