On Thu, Jun 16, 2022 at 09:22:16PM +0800, Rex-BC Chen wrote: > On Tue, 2022-06-14 at 14:23 -0600, Rob Herring wrote: > > On Fri, Jun 10, 2022 at 06:55:13PM +0800, Bo-Chen Chen wrote: > > > From: Markus Schneider-Pargmann <[email protected]> > > > > > > This controller is present on several mediatek hardware. Currently > > > mt8195 and mt8395 have this controller without a functional > > > difference, > > > so only one compatible field is added. > > > > > > The controller can have two forms, as a normal display port and as > > > an > > > embedded display port. > > > > > > Signed-off-by: Markus Schneider-Pargmann <[email protected]> > > > Signed-off-by: Guillaume Ranquet <[email protected]> > > > [Bo-Chen: Fix reviewers' comment] > > > Signed-off-by: Bo-Chen Chen <[email protected]> > > > --- > > > .../display/mediatek/mediatek,dp.yaml | 101 > > > ++++++++++++++++++ > > > 1 file changed, 101 insertions(+) > > > create mode 100644 > > > Documentation/devicetree/bindings/display/mediatek/mediatek,dp.yaml > > > > > > diff --git > > > a/Documentation/devicetree/bindings/display/mediatek/mediatek,dp.ya > > > ml > > > b/Documentation/devicetree/bindings/display/mediatek/mediatek,dp.ya > > > ml > > > new file mode 100644 > > > index 000000000000..10f50a0dcf49 > > > --- /dev/null > > > +++ > > > b/Documentation/devicetree/bindings/display/mediatek/mediatek,dp.ya > > > ml > > > @@ -0,0 +1,101 @@ > > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) > > > +%YAML 1.2 > > > +--- > > > +$id: > > > https://urldefense.com/v3/__http://devicetree.org/schemas/display/mediatek/mediatek,dp.yaml*__;Iw!!CTRNKA9wMg0ARbw!yqAl1KhfbHqHN7-5aeqhzqeOVhPU_Z5beko5q-y-s5pcfp1WL5oVGvY5UF4EfWm4PWjc5mjBwyBUMsr_RI45ipbhsw$ > > > > > > +$schema: > > > https://urldefense.com/v3/__http://devicetree.org/meta-schemas/core.yaml*__;Iw!!CTRNKA9wMg0ARbw!yqAl1KhfbHqHN7-5aeqhzqeOVhPU_Z5beko5q-y-s5pcfp1WL5oVGvY5UF4EfWm4PWjc5mjBwyBUMsr_RI5WzYKENQ$ > > > > > > + > > > +title: MediaTek Display Port Controller > > > + > > > +maintainers: > > > + - Chun-Kuang Hu <[email protected]> > > > + - Jitao shi <[email protected]> > > > + > > > +description: | > > > + Device tree bindings for the MediaTek display port and > > > + embedded display port controller present on some MediaTek SoCs. > > > + > > > +properties: > > > + compatible: > > > + enum: > > > + - mediatek,mt8195-dp-tx > > > + - mediatek,mt8195-edp-tx > > > + > > > + reg: > > > + maxItems: 1 > > > + > > > + nvmem-cells: > > > + maxItems: 1 > > > + description: efuse data for display port calibration > > > + > > > + nvmem-cell-names: > > > + const: dp_calibration_data > > > + > > > + power-domains: > > > + maxItems: 1 > > > + > > > + interrupts: > > > + maxItems: 1 > > > + > > > + ports: > > > + $ref: /schemas/graph.yaml#/properties/ports > > > + properties: > > > + port@0: > > > + $ref: /schemas/graph.yaml#/properties/port > > > + description: Input endpoint of the controller, usually > > > dp_intf > > > + > > > + port@1: > > > + $ref: /schemas/graph.yaml#/properties/port > > > + description: Output endpoint of the controller > > > + > > > + required: > > > + - port@0 > > > + - port@1 > > > + > > > + max-lanes: > > > + maxItems: 1 > > > + description: maximum number of lanes supported by the > > > hardware. > > > > We already have a 'data-lanes' property defined in > > 'video-interfaces.yaml' that can serve this purpose. > > > > Hello Rob, > > Thanks for review. > From the description of video-interfaces.yaml, I think it's not quite > match what we need. We only need this value be one of "1,2,4".
data-lanes = <0>; data-lanes = <0 1>; data-lanes = <0 1 2 3>; Limiting the number of lanes to something less than the max is exactly how this property is used in addition to being able to show the mapping of lanes. Rob
