On Tue, Nov 26, 2013 at 10:01:54AM +0800, Daniel Kurtz wrote:
> On Sat, Nov 23, 2013 at 2:41 AM, Thierry Reding
> <thierry.reding@xxxxxxxxx> wrote:
> > This binding specifies a set of common properties for display panels. It
> > can be used as a basis by bindings for specific panels.
> >
> > Bindings for three specific panels are provided to show how the simple
> > panel binding can be used.
[...]
> > +Example:
> > +
> > + panel: panel {
> > + compatible = "cptt,claa101wb01";
> > + ddc-i2c-bus = <&panelddc>;
> > +
> > + power-supply = <&vdd_pnl_reg>;
> > + enable-gpios = <&gpio 90 0>;
> > +
> > + backlight = <&backlight>;
> > + };
>
>
> Pardon the question if this has been discussed before, but, would this
> also be a good binding in which to store a panel's physical dimensions
> (mmWidth, mmHeight)? Or is there another binding more appropriate?
This binding doesn't define those properties because they are implied by
the compatible string. The corresponding driver defines a structure like
this:
struct panel_desc {
const struct drm_display_mode *modes;
unsigned int num_modes;
struct {
unsigned int width;
unsigned int height;
} size;
};
The panel_desc.size structure contains the physical panel dimensions,
specified in mm. With that, a panel will be supported by defining
something like this:
static const struct drm_display_mode foo_mode = {
...
};
static const struct panel_desc foo = {
.modes = &foo_mode,
.num_modes = 1,
.size {
.width = 223,
.height = 125,
},
};
static const struct of_device_id platform_of_match[] = {
...
{
.compatible = "vendor,foo",
.data = &foo,
},
...
};
I assume you have a specific use-case in mind. Does this provide what
you need? The driver patches were posted earlier[0][1]. They have
changed slightly since then to address review comments, but nothing
significant.
Thierry
[0]: http://www.spinics.net/lists/devicetree/msg08498.html
[1]: http://www.spinics.net/lists/devicetree/msg08499.html
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