Hi Peter,
thanks for commenting,
On Sun, Apr 22, 2018 at 10:02:41PM +0200, Peter Rosin wrote:
> On 2018-04-19 11:31, Jacopo Mondi wrote:
> > The THC63LVD1024 LVDS to RGB bridge supports two different input mapping
> > modes, selectable by means of an external pin.
> >
> > Describe the LVDS mode map through a newly defined mandatory property in
> > device tree bindings.
> >
> > Signed-off-by: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>
> > ---
> > .../devicetree/bindings/display/bridge/thine,thc63lvd1024.txt | 3 +++
> > 1 file changed, 3 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/display/bridge/thine,thc63lvd1024.txt b/Documentation/devicetree/bindings/display/bridge/thine,thc63lvd1024.txt
> > index 37f0c04..0937595 100644
> > --- a/Documentation/devicetree/bindings/display/bridge/thine,thc63lvd1024.txt
> > +++ b/Documentation/devicetree/bindings/display/bridge/thine,thc63lvd1024.txt
> > @@ -12,6 +12,8 @@ Required properties:
> > - compatible: Shall be "thine,thc63lvd1024"
> > - vcc-supply: Power supply for TTL output, TTL CLOCKOUT signal, LVDS input,
> > PPL and digital circuitry
> > +- thine,map: LVDS mapping mode selection signal, pin name "MAP". Shall be <1>
> > + for mapping mode 1, <0> for mapping mode 2
>
> Since the MAP pin is an input pin, I would expect there to be an optional gpio
> specifier like thine,map-gpios so that the driver can set it according to
> the value given in thine,map in case the HW has a line from some gpio output
> to the MAP pin (instead of hardwired hi/low which seem to be your thinking).
I see... As the only use case I had has the pin tied to vcc, I
thought about making it a binary property, and I wonder in how many
cases the chip 'MAP' pin would actually be GPIO controlled input and
not an hardwired one instead. I don't see the LVDS mapping mode to be
changed at runtime, but you are right, who knows....
Do you think we can add an options 'thine,map-gpios' property along
to the proposed ones?
thanks
j
>
> Cheers,
> Peter
>
> >
> > Optional properties:
> > - powerdown-gpios: Power down GPIO signal, pin name "/PDWN". Active low
> > @@ -36,6 +38,7 @@ Example:
> >
> > vcc-supply = <®_lvds_vcc>;
> > powerdown-gpios = <&gpio4 15 GPIO_ACTIVE_LOW>;
> > + thine,map = <1>;
> >
> > ports {
> > #address-cells = <1>;
> >
>
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