[U-Boot] [PATCH v4 04/13] clk: Extend struct clk to provide information regarding clock rate

[Lukasz Majewski]

Hi Marek,

> On 5/17/19 12:10 AM, Lukasz Majewski wrote:
> > This commit extends the struct clk to provide information regarding
> > the clock rate.
> > As a result the clock tree traversal is performed at most once, and
> > further reads are using the cached value.
> > 
> > Signed-off-by: Lukasz Majewski <lukma at denx.de>
> > 
> > ---
> > 
> > Changes in v4:
> > - None
> > 
> > Changes in v3: None
> > 
> >  include/clk.h | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/include/clk.h b/include/clk.h
> > index a909b71f1a..1f2fd15bb5 100644
> > --- a/include/clk.h
> > +++ b/include/clk.h
> > @@ -40,6 +40,7 @@ struct udevice;
> >   * other clock APIs to identify which clock signal to operate upon.
> >   *
> >   * @dev: The device which implements the clock signal.
> > + * @rate: The clock rate (in HZ).
> >   * @id: The clock signal ID within the provider.
> >   * @data: An optional data field for scenarios where a single
> > integer ID is not
> >   *	  sufficient. If used, it can be populated through
> > an .of_xlate op and @@ -55,6 +56,7 @@ struct udevice;
> >   */
> >  struct clk {
> >  	struct udevice *dev;
> > +	unsigned long rate;	/* in HZ */  
> 
> Can this be unsigned long long ? Think of 3 GHz PLL on arm32 in IDT
> Versaclock line of clock synthesisers ; this would overflow right
> here.
> 

Thanks for spotting this - I will use unsigned long long instead.


Best regards,

Lukasz Majewski

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