[U-Boot] [PATCH v2 04/17] dm: clk: Define clk_get_by_id() for clk operations

[Lukasz Majewski <lukma@denx.de>]

Hi Simon,

> On Thu, 31 Jan 2019 at 02:04, Lukasz Majewski <lukma@denx.de> wrote:
> >
> > This commit adds the clk_get_by_id() function, which is responsible
> > for getting the udevice with matching clk->id. Such approach allows
> > re-usage of inherit DM list relationship for the same class
> > (UCLASS_CLK). As a result - we don't need any other external list -
> > it is just enough to look for UCLASS_CLK related udevices.
> >
> > Signed-off-by: Lukasz Majewski <lukma@denx.de>
> > ---
> >
> > Changes in v2: None
> >
> >  drivers/clk/clk-uclass.c | 22 ++++++++++++++++++++++
> >  include/clk.h            | 11 +++++++++++
> >  2 files changed, 33 insertions(+)
> >  
> 
> Please add a test that calls this.

Ok.

> 
> > diff --git a/drivers/clk/clk-uclass.c b/drivers/clk/clk-uclass.c
> > index f1640dda67..12ec0baa74 100644
> > --- a/drivers/clk/clk-uclass.c
> > +++ b/drivers/clk/clk-uclass.c
> > @@ -455,6 +455,28 @@ int clk_disable_bulk(struct clk_bulk *bulk)
> >         return 0;
> >  }
> >
> > +int clk_get_by_id(ulong id, struct clk **c)  
> 
> Can you use clkp instead of c?

Ok.

> 
> > +{
> > +       struct udevice *dev;
> > +       struct uclass *uc;
> > +       int ret;
> > +
> > +       ret = uclass_get(UCLASS_CLK, &uc);
> > +       if (ret)
> > +               return ret;
> > +
> > +       uclass_foreach_dev(dev, uc) {
> > +               struct clk *clk = (struct clk
> > *)dev_get_driver_data(dev); +
> > +               if (clk->id == id) {
> > +                       *c = clk;
> > +                       return 0;
> > +               }
> > +       }
> > +
> > +       return -ENODEV;  
> 
> I wonder if -ENOENT would be better?

Yes, it would better describe the situation.

> 
> > +}
> > +
> >  UCLASS_DRIVER(clk) = {
> >         .id             = UCLASS_CLK,
> >         .name           = "clk",
> > diff --git a/include/clk.h b/include/clk.h
> > index 8224295ec3..045e60357d 100644
> > --- a/include/clk.h
> > +++ b/include/clk.h
> > @@ -315,4 +315,15 @@ static inline bool clk_valid(struct clk *clk)
> >  {
> >         return !!clk->dev;
> >  }
> > +
> > +/**
> > + * clk_get_by_id() - Get the clock by knowing its ID
> > + *
> > + * @id:        The clock ID to search for
> > + *
> > + * @c: A pointer to clock struct that has been found among added
> > clocks
> > + *      to UCLASS_CLK
> > + * @return zero on success, or -ve error code.  
> 
> -NOENT on error? I think you can be specific here

Ok.

> 
> > + */
> > +int clk_get_by_id(ulong id, struct clk **c);
> >  #endif
> > --
> > 2.11.0
> >  
> 
> Regards,
> Simon


Best regards,

Lukasz Majewski

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