linux-kernel - Re: [PATCH V4 1/1] clk: bulk: add of_clk_bulk

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Date:   Wed, 20 Dec 2017 21:53:30 +0800
From:   Dong Aisheng <dongas86@...il.com>
To:     Stephen Boyd <sboyd@...eaurora.org>
Cc:     Dong Aisheng <aisheng.dong@....com>, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        mturquette@...libre.com, shawnguo@...nel.org,
        s.nawrocki@...sung.com, geert@...ux-m68k.org,
        Russell King <linux@....linux.org.uk>
Subject: Re: [PATCH V4 1/1] clk: bulk: add of_clk_bulk_get()

On Fri, Sep 29, 2017 at 03:48:21PM -0700, Stephen Boyd wrote:
> On 09/26, Dong Aisheng wrote:
> > 'clock-names' property is optinal in DT, so of_clk_bulk_get() is introduced
> 
> s/optinal/optional/
> 

Got it.

> > here to handle this for DT users without 'clock-names' specified.
> > 
> > Cc: Stephen Boyd <sboyd@...eaurora.org>
> > Cc: Michael Turquette <mturquette@...libre.com>
> > Cc: Russell King <linux@....linux.org.uk>
> > Reported-by: Shawn Guo <shawnguo@...nel.org>
> > Signed-off-by: Dong Aisheng <aisheng.dong@....com>
> > 
> > ---
> > Changes since v3:
> >  * fix build warning on the SH platform
> > 
> > Changes since v2:
> >  * of_clk_bulk_get should return -ENOENT;
> > 
> > Changes since v1:
> >  * using %pOF instead of full_name
> > ---
> >  drivers/clk/clk-bulk.c | 31 +++++++++++++++++++++++++++++++
> >  include/linux/clk.h    |  8 ++++++++
> >  2 files changed, 39 insertions(+)
> > 
> > diff --git a/drivers/clk/clk-bulk.c b/drivers/clk/clk-bulk.c
> > index c834f5a..896aa3b 100644
> > --- a/drivers/clk/clk-bulk.c
> > +++ b/drivers/clk/clk-bulk.c
> > @@ -19,6 +19,37 @@
> >  #include <linux/clk.h>
> >  #include <linux/device.h>
> >  #include <linux/export.h>
> > +#include <linux/of.h>
> > +
> > +#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)
> > +{
> > +	int ret;
> > +	int i;
> > +
> > +	for (i = 0; i < num_clks; i++)
> > +		clks[i].clk = NULL;
> > +
> > +	for (i = 0; i < num_clks; i++) {
> > +		clks[i].clk = of_clk_get(np, i);
> > +		if (IS_ERR(clks[i].clk)) {
> > +			ret = PTR_ERR(clks[i].clk);
> > +			pr_err("%pOF: Failed to get clk index: %d ret: %d\n",
> > +			       np, i, ret);
> > +			clks[i].clk = NULL;
> > +			goto err;
> > +		}
> > +	}
> > +
> > +	return 0;
> > +
> > +err:
> > +	clk_bulk_put(i, clks);
> > +
> > +	return ret;
> > +}
> 
> Export the symbol?
> 

Got it.

> > +#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?

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?

Regards
Dong Aisheng