Hi Jacopo,
(CC'ing Mark Brown)
On Friday, 6 April 2018 17:25:58 EEST jacopo mondi wrote:
> On Fri, Apr 06, 2018 at 04:15:35PM +0300, Laurent Pinchart wrote:
> > On Friday, 6 April 2018 15:41:56 EEST Jacopo Mondi wrote:
> >> Document Thine THC63LVD1024 LVDS decoder device tree bindings.
> >>
> >> Signed-off-by: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>
> >> Reviewed-by: Andrzej Hajda <a.hajda@xxxxxxxxxxx>
> >> Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
> >> Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> >> ---
> >>
> >> .../bindings/display/bridge/thine,thc63lvd1024.txt | 60
> >> +++++++++++++++++++
> >> 1 file changed, 60 insertions(+)
> >> create mode 100644
> >>
> >> Documentation/devicetree/bindings/display/bridge/thine,thc63lvd1024.txt
> >>
> >> diff --git
> >> a/Documentation/devicetree/bindings/display/bridge/thine,thc63lvd1024.tx
> >> t
> >> b/Documentation/devicetree/bindings/display/bridge/thine,thc63lvd1024.tx
> >> t
> >> new file mode 100644
> >> index 0000000..1191f17
> >> --- /dev/null
> >> +++
> >> b/Documentation/devicetree/bindings/display/bridge/thine,thc63lvd1024.tx
> >> t
> >> @@ -0,0 +1,60 @@
> >> +Thine Electronics THC63LVD1024 LVDS decoder
> >> +-------------------------------------------
> >> +
> >> +The THC63LVD1024 is a dual link LVDS receiver designed to convert LVDS
> >> streams
> >> +to parallel data outputs. The chip supports single/dual input/output
> >> modes,
> >> +handling up to two two input LVDS stream and up to two digital CMOS/TTL
> >
> > s/to two two/to two/
> > s/stream/streams/
> >
> >> outputs.
> >> +
> >> +Single or dual operation modes, output data mapping and DDR output
> >> modes are
> >> +configured through input signals and the chip does not expose any
> >> control bus.
> >> +
> >> +Required properties:
> >> +- compatible: Shall be "thine,thc63lvd1024"
> >> +
> >> +Optional properties:
> >> +- vcc-supply: Power supply for TTL output, TTL CLOCKOUT signal, LVDS
> >> input,
> >> + PPL and digital circuitry
> >> +- powerdown-gpios: Power down GPIO signal, pin name "/PDWN". Active low
> >> +- enable-gpios: Output enable GPIO signal, pin name "OE". Active high
> >
> > As Rob mentioned in a reply to v6, we currently use "enable" as the
> > inverse of "powerdown". I would call this one oe-gpios instead. Quoting
> > Rob:
> >
> > "Debating "oe" vs. "output-enable" is bikeshedding IMO. Anyone familiar
> > with h/w design should recognize OE."
>
> I got a different understanding of what Rob meant. I thought "anyone
> familiar with h/w design should recognize OE" as that nobody would get
> confused if a pin named OE in the chip manual is descibed by an
> 'enable' property.
>
> But as discussed offline, enable has probably to be used as the
> opposite of powerdown for complete chip sleep, not just for output
> pad.
>
> Anyway, we spent enough time on naming issues, starting from my first
> stupid 'pdwn' permutations then on this semi-standard names.
>
> I'll send next version with 'powerdown-gpios' and 'oe-gpios'
> properties hoping that would be finally accepted by everyone.
I certainly won't complain (as long as you write pwdn instead of pdwn in the
driver :-)).
> Same on the mandatory/optional VCC supply thing. Let's try to make
> next version the final one. If the optional property with the dummy
> regulator doesn't satisfy you and it is preferred to have a fixed-regulator
> anyhow in DT I'll do in next version, othewise let's try not to change
> it again. I'll just remark here that in the current Eagle design vcc is
> connected to a power rail with no regulator at all :)
I don't like the dummy regulator much, as it generates a dev_warn(), which
makes me believe that it's a hack rather than a proper solution. You might
want to ask Mark Brown for his opinion.
> >> +
> >> +The THC63LVD1024 video port connections are modeled according
> >> +to OF graph bindings specified by Documentation/devicetree/bindings/
> >> graph.txt
> >> +
> >> +Required video port nodes:
> >> +- port@0: First LVDS input port
> >> +- port@2: First digital CMOS/TTL parallel output
> >> +
> >> +Optional video port nodes:
> >> +- port@1: Second LVDS input port
> >> +- port@3: Second digital CMOS/TTL parallel output
> >> +
> >> +Example:
> >> +--------
> >> +
> >> + thc63lvd1024: lvds-decoder {
> >> + compatible = "thine,thc63lvd1024";
> >> +
> >> + vcc-supply = <®_lvds_vcc>;
> >> + powerdown-gpios = <&gpio4 15 GPIO_ACTIVE_LOW>;
> >> +
> >> + ports {
> >> + #address-cells = <1>;
> >> + #size-cells = <0>;
> >> +
> >> + port@0 {
> >> + reg = <0>;
> >> +
> >> + lvds_dec_in_0: endpoint {
> >> + remote-endpoint = <&lvds_out>;
> >> + };
> >> + };
> >> +
> >> + port@2{
> >> + reg = <2>;
> >> +
> >> + lvds_dec_out_2: endpoint {
> >> + remote-endpoint = <&adv7511_in>;
> >> + };
> >> + };
> >> + };
> >> + };
--
Regards,
Laurent Pinchart
