| Message ID | 20181229070649.21308-2-peda@axentia.se (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | drm/bridge: various small lvds-encoder things | expand |
On Sat, Dec 29, 2018 at 07:07:19AM +0000, Peter Rosin wrote: > DS90C185 has a shutdown pin which does not fit in the lvds-transmitter > binding, which is meant to be generic. > > The sister chip DS90C187 is similar to DS90C185, describe it here as well. > > Signed-off-by: Peter Rosin <peda@axentia.se> > --- > .../bindings/display/bridge/lvds-transmitter.txt | 8 +--- > .../bindings/display/bridge/ti,ds90c185.txt | 55 ++++++++++++++++++++++ > 2 files changed, 56 insertions(+), 7 deletions(-) > create mode 100644 Documentation/devicetree/bindings/display/bridge/ti,ds90c185.txt > > diff --git a/Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt b/Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt > index 50220190c203..fd39ad34c383 100644 > --- a/Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt > +++ b/Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt > @@ -22,13 +22,7 @@ among others. > > Required properties: > > -- compatible: Must be one or more of the following > - - "ti,ds90c185" for the TI DS90C185 FPD-Link Serializer > - - "lvds-encoder" for a generic LVDS encoder device > - > - When compatible with the generic version, nodes must list the > - device-specific version corresponding to the device first > - followed by the generic version. I think you should keep something here. I'd reword it to say any encoder with additional properties must have a device specific compatible in addition. > +- compatible: Must be "lvds-encoder" > > Required nodes: > > diff --git a/Documentation/devicetree/bindings/display/bridge/ti,ds90c185.txt b/Documentation/devicetree/bindings/display/bridge/ti,ds90c185.txt > new file mode 100644 > index 000000000000..e575f996959a > --- /dev/null > +++ b/Documentation/devicetree/bindings/display/bridge/ti,ds90c185.txt > @@ -0,0 +1,55 @@ > +Texas Instruments FPD-Link (LVDS) Serializer > +-------------------------------------------- > + > +The DS90C185 and DS90C187 are low-power serializers for portable > +battery-powered applications that reduces the size of the RGB > +interface between the host GPU and the display. > + > +Required properties: > + > +- compatible: Should be > + "ti,ds90c185", "lvds-encoder" for the TI DS90C185 FPD-Link Serializer > + "ti,ds90c187", "lvds-encoder" for the TI DS90C187 FPD-Link Serializer > + > +Optional properties: > + > +- powerdown-gpios: Power down control GPIO (the PDB pin, active-low) > + > +Required nodes: > + > +The devices have two video ports. Their connections are modeled using the OF > +graph bindings specified in Documentation/devicetree/bindings/graph.txt. > + > +- Video port 0 for parallel input > +- Video port 1 for LVDS output > + > + > +Example > +------- > + > +lvds-encoder { > + compatible = "ti,ds90c185", "lvds-encoder"; > + > + powerdown-gpios = <&gpio 17 GPIO_ACTIVE_LOW>; > + > + ports { > + #address-cells = <1>; > + #size-cells = <0>; > + > + port@0 { > + reg = <0>; > + > + lvds_enc_in: endpoint { > + remote-endpoint = <&lcdc_out_rgb>; > + }; > + }; > + > + port@1 { > + reg = <1>; > + > + lvds_enc_out: endpoint { > + remote-endpoint = <&lvds_panel_in>; > + }; > + }; > + }; > +}; > -- > 2.11.0 >
Hello, On Fri, Jan 11, 2019 at 08:49:04AM -0600, Rob Herring wrote: > On Sat, Dec 29, 2018 at 07:07:19AM +0000, Peter Rosin wrote: > > DS90C185 has a shutdown pin which does not fit in the lvds-transmitter > > binding, which is meant to be generic. > > > > The sister chip DS90C187 is similar to DS90C185, describe it here as well. > > > > Signed-off-by: Peter Rosin <peda@axentia.se> > > --- > > .../bindings/display/bridge/lvds-transmitter.txt | 8 +--- > > .../bindings/display/bridge/ti,ds90c185.txt | 55 ++++++++++++++++++++++ > > 2 files changed, 56 insertions(+), 7 deletions(-) > > create mode 100644 Documentation/devicetree/bindings/display/bridge/ti,ds90c185.txt > > > > diff --git a/Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt b/Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt > > index 50220190c203..fd39ad34c383 100644 > > --- a/Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt > > +++ b/Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt > > @@ -22,13 +22,7 @@ among others. > > > > Required properties: > > > > -- compatible: Must be one or more of the following > > - - "ti,ds90c185" for the TI DS90C185 FPD-Link Serializer > > - - "lvds-encoder" for a generic LVDS encoder device > > - > > - When compatible with the generic version, nodes must list the > > - device-specific version corresponding to the device first > > - followed by the generic version. > > I think you should keep something here. I'd reword it to say any encoder > with additional properties must have a device specific compatible in > addition. I was going to mention this too. Maybe - compatible: Shall contain a device-specific compatible string follow by "lvds-encoder". That's stronger than Rob's suggestion, as I don't think we should allow omitting the device-specific compatible string in any case to make sure we can preserve backward compatibility in the future. > > +- compatible: Must be "lvds-encoder" > > > > Required nodes: > > > > diff --git a/Documentation/devicetree/bindings/display/bridge/ti,ds90c185.txt b/Documentation/devicetree/bindings/display/bridge/ti,ds90c185.txt > > new file mode 100644 > > index 000000000000..e575f996959a > > --- /dev/null > > +++ b/Documentation/devicetree/bindings/display/bridge/ti,ds90c185.txt > > @@ -0,0 +1,55 @@ > > +Texas Instruments FPD-Link (LVDS) Serializer > > +-------------------------------------------- > > + > > +The DS90C185 and DS90C187 are low-power serializers for portable > > +battery-powered applications that reduces the size of the RGB > > +interface between the host GPU and the display. > > + > > +Required properties: > > + > > +- compatible: Should be > > + "ti,ds90c185", "lvds-encoder" for the TI DS90C185 FPD-Link Serializer > > + "ti,ds90c187", "lvds-encoder" for the TI DS90C187 FPD-Link Serializer s/ for/ for/ With these fixed, Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> > > + > > +Optional properties: > > + > > +- powerdown-gpios: Power down control GPIO (the PDB pin, active-low) > > + > > +Required nodes: > > + > > +The devices have two video ports. Their connections are modeled using the OF > > +graph bindings specified in Documentation/devicetree/bindings/graph.txt. > > + > > +- Video port 0 for parallel input > > +- Video port 1 for LVDS output > > + > > + > > +Example > > +------- > > + > > +lvds-encoder { > > + compatible = "ti,ds90c185", "lvds-encoder"; > > + > > + powerdown-gpios = <&gpio 17 GPIO_ACTIVE_LOW>; > > + > > + ports { > > + #address-cells = <1>; > > + #size-cells = <0>; > > + > > + port@0 { > > + reg = <0>; > > + > > + lvds_enc_in: endpoint { > > + remote-endpoint = <&lcdc_out_rgb>; > > + }; > > + }; > > + > > + port@1 { > > + reg = <1>; > > + > > + lvds_enc_out: endpoint { > > + remote-endpoint = <&lvds_panel_in>; > > + }; > > + }; > > + }; > > +};
diff --git a/Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt b/Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt index 50220190c203..fd39ad34c383 100644 --- a/Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt +++ b/Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt @@ -22,13 +22,7 @@ among others. Required properties: -- compatible: Must be one or more of the following - - "ti,ds90c185" for the TI DS90C185 FPD-Link Serializer - - "lvds-encoder" for a generic LVDS encoder device - - When compatible with the generic version, nodes must list the - device-specific version corresponding to the device first - followed by the generic version. +- compatible: Must be "lvds-encoder" Required nodes: diff --git a/Documentation/devicetree/bindings/display/bridge/ti,ds90c185.txt b/Documentation/devicetree/bindings/display/bridge/ti,ds90c185.txt new file mode 100644 index 000000000000..e575f996959a --- /dev/null +++ b/Documentation/devicetree/bindings/display/bridge/ti,ds90c185.txt @@ -0,0 +1,55 @@ +Texas Instruments FPD-Link (LVDS) Serializer +-------------------------------------------- + +The DS90C185 and DS90C187 are low-power serializers for portable +battery-powered applications that reduces the size of the RGB +interface between the host GPU and the display. + +Required properties: + +- compatible: Should be + "ti,ds90c185", "lvds-encoder" for the TI DS90C185 FPD-Link Serializer + "ti,ds90c187", "lvds-encoder" for the TI DS90C187 FPD-Link Serializer + +Optional properties: + +- powerdown-gpios: Power down control GPIO (the PDB pin, active-low) + +Required nodes: + +The devices have two video ports. Their connections are modeled using the OF +graph bindings specified in Documentation/devicetree/bindings/graph.txt. + +- Video port 0 for parallel input +- Video port 1 for LVDS output + + +Example +------- + +lvds-encoder { + compatible = "ti,ds90c185", "lvds-encoder"; + + powerdown-gpios = <&gpio 17 GPIO_ACTIVE_LOW>; + + ports { + #address-cells = <1>; + #size-cells = <0>; + + port@0 { + reg = <0>; + + lvds_enc_in: endpoint { + remote-endpoint = <&lcdc_out_rgb>; + }; + }; + + port@1 { + reg = <1>; + + lvds_enc_out: endpoint { + remote-endpoint = <&lvds_panel_in>; + }; + }; + }; +};
DS90C185 has a shutdown pin which does not fit in the lvds-transmitter binding, which is meant to be generic. The sister chip DS90C187 is similar to DS90C185, describe it here as well. Signed-off-by: Peter Rosin <peda@axentia.se> --- .../bindings/display/bridge/lvds-transmitter.txt | 8 +--- .../bindings/display/bridge/ti,ds90c185.txt | 55 ++++++++++++++++++++++ 2 files changed, 56 insertions(+), 7 deletions(-) create mode 100644 Documentation/devicetree/bindings/display/bridge/ti,ds90c185.txt