Re: [PATCH RFC 0/2] drivers/base: simplify simple DT-based components

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Sun, Feb 09, 2014 at 10:22:19AM +0100, Jean-Francois Moine wrote:
> On Fri, 7 Feb 2014 20:23:51 +0000
> Russell King - ARM Linux <linux@xxxxxxxxxxxxxxxx> wrote:
> 
> > Here's my changes to the TDA998x driver to add support for the component
> > helper.  The TDA998x driver retains support for the old way so that
> > drivers can be transitioned.  For any one DRM "card" the transition to
> 
> I rewrote the tda998x as a simple encoder+connector (i.e. not a
> slave_encoder) with your component helper, and the code is much clearer
> and simpler: the DRM driver has nothing to do except to know that the
> tda998x is a component and to set the possible_crtcs.

That's exactly what I've done - the slave encoder veneer can be simply
deleted when tilcdc is converted.

> AFAIK, only the tilcdc drm driver is using the tda998x as a
> slave_encoder. It does a (encoder+connector) conversion to
> (slave_encoder). Then, in your changes in the TDA998x, you do a
> (slave_encoder) translation to (encoder+connector).
> This seems rather complicated!

No.  I first split out the slave encoder functions to be a veneer onto
the tda998x backend, and then add the encoder & connector component
support.  Later, the slave encoder veneer can be deleted.

The reason for this is that virtually all the tda998x backend is what's
required by the encoder & connector support - which is completely logical
when you realise that the generic slave encoder support is just a veneer
itself adapting the encoder & connector support to a slave encoder.

So, we're basically getting rid of two veneers, but we end up with exactly
the same functionality.

> > And yes, I'm thinking that maybe moving compare_of() into the component
> > support so that drivers can share this generic function may be a good
> > idea.
> 
> This function exists already in drivers/of/platform.c as
> of_dev_node_match(). It just needs to be exported.

Good, thanks for pointing that out.

-- 
FTTC broadband for 0.8mile line: 5.8Mbps down 500kbps up.  Estimation
in database were 13.1 to 19Mbit for a good line, about 7.5+ for a bad.
Estimate before purchase was "up to 13.2Mbit".
_______________________________________________
dri-devel mailing list
dri-devel@xxxxxxxxxxxxxxxxxxxxx
http://lists.freedesktop.org/mailman/listinfo/dri-devel




[Index of Archives]     [Linux DRI Users]     [Linux Intel Graphics]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]
  Powered by Linux