Hi Geert,
On Tuesday, 28 August 2018 15:10:52 EEST Geert Uytterhoeven wrote:
> Hi Sergei, Laurent, Kieran,
>
> On Wed, Jun 13, 2018 at 10:11 PM Sergei Shtylyov wrote:
> > Describe the interconnected FCPVD0, VSPD0, DU, and LVDS0 devices in the
> > R8A77980 device tree...
> >
> > Based on the original (and large) patch by Vladimir Barinov.
> >
> > Signed-off-by: Vladimir Barinov <vladimir.barinov@xxxxxxxxxxxxxxxxxx>
> > Signed-off-by: Sergei Shtylyov <sergei.shtylyov@xxxxxxxxxxxxxxxxxx>
> > Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> >
> > --- renesas.orig/arch/arm64/boot/dts/renesas/r8a77980.dtsi
> > +++ renesas/arch/arm64/boot/dts/renesas/r8a77980.dtsi
> >
> > + du: display@feb00000 {
> > + compatible = "renesas,du-r8a77980",
> > + "renesas,du-r8a77970";
> > + reg = <0 0xfeb00000 0 0x80000>;
> > + interrupts = <GIC_SPI 256 IRQ_TYPE_LEVEL_HIGH>;
> > + clocks = <&cpg CPG_MOD 724>;
> > + clock-names = "du.0";
> > + power-domains = <&sysc R8A77980_PD_ALWAYS_ON>;
> > + resets = <&cpg 724>;
> > + vsps = <&vspd0>;
>
> According to the bindings, the vsps property should also contain a
> channel index.
>
> Laurent added the indices to r8a7795.dtsi, but r8a7795-es.dtsi overrides
> that with a version without the indices.
> Kieran included the indices when adding DU support for r8a77965 and
> r8a77995.
>
> r8a7796.dtsi, r8a77970.dtsi, and r8a77980.dtsi lack the indices.
>
> Commit fd57d77f9c649cf9 ("dt-bindings: display: rcar-du: Add a VSP channel
> index to the vsps DT property") says a backwards-compatibility mode can be
> implemented, but I fail to see how this can work, as rcar_du_vsps_init()
> will just return an error, which is propagated.
>
> What am I missing?
We're missing a DT validator :-/
The vsps property shoould indeed contain indices. However, rcar_du_vsps_init()
implements a backward-compatibility mode by checking the length of the
property:
cells = of_property_count_u32_elems(np, "vsps") / rcdu->num_crtcs - 1;
and using that as an argument to of_parse_phandle_with_fixed_args().
--
Regards,
Laurent Pinchart
