[U-Boot] [PATCH 4/5] include: dma: Update the function description for dma_memcpy

[Chee, Tien Fong <tien.fong.chee@intel.com>]

On Fri, 2018-06-01 at 08:25 -0600, Simon Glass wrote:
> Hi,
> 
> On 31 May 2018 at 02:08,  <tien.fong.chee@intel.com> wrote:
> > 
> > From: Tien Fong Chee <tien.fong.chee@intel.com>
> > 
> > Update the dma_memcpy description on return argument for DMA330
> > driver.
> > 
> > Signed-off-by: Tien Fong Chee <tien.fong.chee@intel.com>
> > ---
> >  include/dma.h | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/include/dma.h b/include/dma.h
> > index 0a0c9dd..b825c1e 100644
> > --- a/include/dma.h
> > +++ b/include/dma.h
> > @@ -79,8 +79,8 @@ int dma_get_device(u32 transfer_type, struct
> > udevice **devp);
> >   * @dst - destination pointer
> >   * @src - souce pointer
> >   * @len - data length to be copied
> > - * @return - on successful transfer returns no of bytes
> > -            transferred and on failure return error code.
> > + * @return - on successful transfer returns no of bytes or
> > zero(for DMA330)
> > + *          transferred and on failure return error code.
> This is a public API so you cannot change it just for one device. You
> can change the API for everyone if you like.
> 
> But why would it want to return 0?
> 
Because we only able to check the DMA tranferring status, full transfer
or failed. I can return the len argument user set if full tranfer is
finished.
> > 
> >   */
> >  int dma_memcpy(struct udevice *dev, void *dst, void *src, size_t
> > len);
> > 
> > --
> > 2.2.0
> > 
> Regards,
> Simon