Hi Laurent, On Fri, Apr 10, 2020 at 03:57:32PM +0300, Laurent Pinchart wrote: > Hi Guido, > > On Fri, Apr 10, 2020 at 02:45:16PM +0200, Guido Günther wrote: > > On Fri, Apr 10, 2020 at 02:23:42PM +0300, Laurent Pinchart wrote: > > > On Thu, Apr 09, 2020 at 12:42:01PM +0200, Guido Günther wrote: > > > > The Northwest Logic MIPI DSI IP core can be found in NXPs i.MX8 SoCs. > > > > > > > > Signed-off-by: Guido Günther <agx@xxxxxxxxxxx> > > > > Tested-by: Robert Chiras <robert.chiras@xxxxxxx> > > > > Reviewed-by: Rob Herring <robh@xxxxxxxxxx> > > > > Acked-by: Sam Ravnborg <sam@xxxxxxxxxxxx> > > > > Reviewed-by: Fabio Estevam <festevam@xxxxxxxxx> > > > > --- > > > > .../bindings/display/bridge/nwl-dsi.yaml | 226 ++++++++++++++++++ > > > > 1 file changed, 226 insertions(+) > > > > create mode 100644 Documentation/devicetree/bindings/display/bridge/nwl-dsi.yaml > > > > > > > > diff --git a/Documentation/devicetree/bindings/display/bridge/nwl-dsi.yaml b/Documentation/devicetree/bindings/display/bridge/nwl-dsi.yaml > > > > new file mode 100644 > > > > index 000000000000..8aff2d68fc33 > > > > --- /dev/null > > > > +++ b/Documentation/devicetree/bindings/display/bridge/nwl-dsi.yaml > > > > @@ -0,0 +1,226 @@ > > > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) > > > > +%YAML 1.2 > > > > +--- > > > > +$id: http://devicetree.org/schemas/display/bridge/nwl-dsi.yaml# > > > > +$schema: http://devicetree.org/meta-schemas/core.yaml# > > > > + > > > > +title: Northwest Logic MIPI-DSI controller on i.MX SoCs > > > > + > > > > +maintainers: > > > > + - Guido Gúnther <agx@xxxxxxxxxxx> > > > > + - Robert Chiras <robert.chiras@xxxxxxx> > > > > + > > > > +description: | > > > > + NWL MIPI-DSI host controller found on i.MX8 platforms. This is a dsi bridge for > > > > + the SOCs NWL MIPI-DSI host controller. > > > > + > > > > +properties: > > > > + compatible: > > > > + const: fsl,imx8mq-nwl-dsi > > > > + > > > > + reg: > > > > + maxItems: 1 > > > > + > > > > + interrupts: > > > > + maxItems: 1 > > > > + > > > > + '#address-cells': > > > > + const: 1 > > > > + > > > > + '#size-cells': > > > > + const: 0 > > > > + > > > > + clocks: > > > > + items: > > > > + - description: DSI core clock > > > > + - description: RX_ESC clock (used in escape mode) > > > > + - description: TX_ESC clock (used in escape mode) > > > > + - description: PHY_REF clock > > > > + - description: LCDIF clock > > > > + > > > > + clock-names: > > > > + items: > > > > + - const: core > > > > + - const: rx_esc > > > > + - const: tx_esc > > > > + - const: phy_ref > > > > + - const: lcdif > > > > + > > > > + mux-controls: > > > > + description: > > > > + mux controller node to use for operating the input mux > > > > + > > > > + phys: > > > > + maxItems: 1 > > > > + description: > > > > + A phandle to the phy module representing the DPHY > > > > + > > > > + phy-names: > > > > + items: > > > > + - const: dphy > > > > + > > > > + power-domains: > > > > + maxItems: 1 > > > > + > > > > + resets: > > > > + items: > > > > + - description: dsi byte reset line > > > > + - description: dsi dpi reset line > > > > + - description: dsi esc reset line > > > > + - description: dsi pclk reset line > > > > + > > > > + reset-names: > > > > + items: > > > > + - const: byte > > > > + - const: dpi > > > > + - const: esc > > > > + - const: pclk > > > > + > > > > + ports: > > > > + type: object > > > > + description: > > > > + A node containing DSI input & output port nodes with endpoint > > > > + definitions as documented in > > > > + Documentation/devicetree/bindings/graph.txt. > > > > + properties: > > > > + port@0: > > > > + type: object > > > > + description: > > > > + Input port node to receive pixel data from the > > > > + display controller. Exactly one endpoint must be > > > > + specified. > > > > + properties: > > > > + '#address-cells': > > > > + const: 1 > > > > + > > > > + '#size-cells': > > > > + const: 0 > > > > + > > > > + endpoint@0: > > > > + description: sub-node describing the input from LCDIF > > > > + type: object > > > > + > > > > + endpoint@1: > > > > + description: sub-node describing the input from DCSS > > > > + type: object > > > > > > This models the two inputs to the IP core, that are connected to a mux > > > internally, controlled through mux-controls, right ? Why is a single > > > endpoint supported then, if there are two connections at the hardware > > > level, and why is this using endpoints instead of ports as there are > > > really two input ports ? > > > > That came out of > > > > https://lore.kernel.org/linux-arm-kernel/c86b7ca2-7799-eafd-c380-e4b551520837@xxxxxxxxxxx/ > > > > # If the ip has separate lines for DCSS and LCDIF you should distinguish > > # by port number. If they are shared > > # you can use endpoint number to specify DCSS or LCDIF, in both cases > > # bindings should be adjusted. > > > > I read that as > > > > - distinguish by endpoint number: > > > > eLCDIF--\ | > > ----| nwl > > DCSS----/ | > > > > - distinguish by port number: > > > > eLCDIF-------| > > | nwl > > DCSS --------| > > I fully agree with you here, but in the first case I would expect the > mux to be outside of the NWL, while in the second case it would be > inside. If I understand the issue correctly, the mux is not part of the > NWL, right ? The endpoint model would then be good, but leaves the issue > Documentation/devicetree/bindings/media/video-mux.txt, but that would > require some support on the driver side. Do you think it would be a good > way forward ? Binding wise that looks like a good fit. I then thought about the implementation and figured we'd end up with something like a bridge that basically muxes inputs - or did you have something different in mind? That sounds generally useful when we e.g. look at runtime switching the input display controller. > The alternative is to consider the mux + NWL as one device (more or less > an i.MX8M-specific integration wrapper of the NWL), but in that case > there should be two ports I believe. I'd go with that for the moment and fold in the above at a later point if needed. I'm happy to work on that but would like to work on some parts of the imx8mq display stack first. Cheers, -- Guido > > From the imx8mq ref manual i didn't see separate input lines for DCSS vs > > eLCDIF the the NWL IP so i went with endpoints instead of ports. I'm > > happy to change that if i got it wrong. > > > > > Apart from that the bindings look ok to me. > > > > > > > + > > > > + reg: > > > > + const: 0 > > > > + > > > > + required: > > > > + - '#address-cells' > > > > + - '#size-cells' > > > > + - reg > > > > + > > > > + oneOf: > > > > + - required: > > > > + - endpoint@0 > > > > + - required: > > > > + - endpoint@1 > > > > + > > > > + additionalProperties: false > > > > + > > > > + port@1: > > > > + type: object > > > > + description: > > > > + DSI output port node to the panel or the next bridge > > > > + in the chain > > > > + > > > > + '#address-cells': > > > > + const: 1 > > > > + > > > > + '#size-cells': > > > > + const: 0 > > > > + > > > > + required: > > > > + - '#address-cells' > > > > + - '#size-cells' > > > > + - port@0 > > > > + - port@1 > > > > + > > > > + additionalProperties: false > > > > + > > > > +patternProperties: > > > > + "^panel@[0-9]+$": > > > > + type: object > > > > + > > > > +required: > > > > + - '#address-cells' > > > > + - '#size-cells' > > > > + - clock-names > > > > + - clocks > > > > + - compatible > > > > + - interrupts > > > > + - mux-controls > > > > + - phy-names > > > > + - phys > > > > + - ports > > > > + - reg > > > > + - reset-names > > > > + - resets > > > > + > > > > +additionalProperties: false > > > > + > > > > +examples: > > > > + - | > > > > + > > > > + #include <dt-bindings/clock/imx8mq-clock.h> > > > > + #include <dt-bindings/interrupt-controller/arm-gic.h> > > > > + #include <dt-bindings/reset/imx8mq-reset.h> > > > > + > > > > + mipi_dsi: mipi_dsi@30a00000 { > > > > + #address-cells = <1>; > > > > + #size-cells = <0>; > > > > + compatible = "fsl,imx8mq-nwl-dsi"; > > > > + reg = <0x30A00000 0x300>; > > > > + clocks = <&clk IMX8MQ_CLK_DSI_CORE>, > > > > + <&clk IMX8MQ_CLK_DSI_AHB>, > > > > + <&clk IMX8MQ_CLK_DSI_IPG_DIV>, > > > > + <&clk IMX8MQ_CLK_DSI_PHY_REF>, > > > > + <&clk IMX8MQ_CLK_LCDIF_PIXEL>; > > > > + clock-names = "core", "rx_esc", "tx_esc", "phy_ref", "lcdif"; > > > > + interrupts = <GIC_SPI 34 IRQ_TYPE_LEVEL_HIGH>; > > > > + mux-controls = <&mux 0>; > > > > + power-domains = <&pgc_mipi>; > > > > + resets = <&src IMX8MQ_RESET_MIPI_DSI_RESET_BYTE_N>, > > > > + <&src IMX8MQ_RESET_MIPI_DSI_DPI_RESET_N>, > > > > + <&src IMX8MQ_RESET_MIPI_DSI_ESC_RESET_N>, > > > > + <&src IMX8MQ_RESET_MIPI_DSI_PCLK_RESET_N>; > > > > + reset-names = "byte", "dpi", "esc", "pclk"; > > > > + phys = <&dphy>; > > > > + phy-names = "dphy"; > > > > + > > > > + panel@0 { > > > > + #address-cells = <1>; > > > > + #size-cells = <0>; > > > > + compatible = "rocktech,jh057n00900"; > > > > + reg = <0>; > > > > + port@0 { > > > > + reg = <0>; > > > > + panel_in: endpoint { > > > > + remote-endpoint = <&mipi_dsi_out>; > > > > + }; > > > > + }; > > > > + }; > > > > + > > > > + ports { > > > > + #address-cells = <1>; > > > > + #size-cells = <0>; > > > > + > > > > + port@0 { > > > > + #size-cells = <0>; > > > > + #address-cells = <1>; > > > > + reg = <0>; > > > > + mipi_dsi_in: endpoint@0 { > > > > + reg = <0>; > > > > + remote-endpoint = <&lcdif_mipi_dsi>; > > > > + }; > > > > + }; > > > > + port@1 { > > > > + reg = <1>; > > > > + mipi_dsi_out: endpoint { > > > > + remote-endpoint = <&panel_in>; > > > > + }; > > > > + }; > > > > + }; > > > > + }; > > -- > Regards, > > Laurent Pinchart >
