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Message-ID: <20190727015925.GB4902@pendragon.ideasonboard.com>
Date: Sat, 27 Jul 2019 04:59:25 +0300
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Sam Ravnborg <sam@...nborg.org>
Cc: Guido Günther <agx@...xcpu.org>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Shawn Guo <shawnguo@...nel.org>,
Sascha Hauer <s.hauer@...gutronix.de>,
Pengutronix Kernel Team <kernel@...gutronix.de>,
Fabio Estevam <festevam@...il.com>,
NXP Linux Team <linux-imx@....com>,
Andrzej Hajda <a.hajda@...sung.com>,
Neil Armstrong <narmstrong@...libre.com>,
Jonas Karlman <jonas@...boo.se>,
Jernej Skrabec <jernej.skrabec@...l.net>,
Lee Jones <lee.jones@...aro.org>,
dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
Robert Chiras <robert.chiras@....com>
Subject: Re: [PATCH 2/3] dt-bindings: display/bridge: Add binding for IMX NWL
mipi dsi host controller
Hello,
On Fri, Jul 26, 2019 at 11:23:15AM +0200, Sam Ravnborg wrote:
> On Wed, Jul 24, 2019 at 05:52:25PM +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@...xcpu.org>
> > ---
> > .../bindings/display/bridge/imx-nwl-dsi.txt | 89 +++++++++++++++++++
>
> New binding. Any chance we can get this in yaml format?
> This is the way forward and we have to convert the file anyway.
>
> None of the other bridges use yaml format, but someone has to be the
> first.
>
> > 1 file changed, 89 insertions(+)
> > create mode 100644 Documentation/devicetree/bindings/display/bridge/imx-nwl-dsi.txt
> >
> > diff --git a/Documentation/devicetree/bindings/display/bridge/imx-nwl-dsi.txt b/Documentation/devicetree/bindings/display/bridge/imx-nwl-dsi.txt
> > new file mode 100644
> > index 000000000000..288fdb726d5a
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/display/bridge/imx-nwl-dsi.txt
> > @@ -0,0 +1,89 @@
> > +Northwest Logic MIPI-DSI on imx SoCs
> > +=====================================
> > +
> > +NWL MIPI-DSI host controller found on i.MX8 platforms. This is a
> > +dsi bridge for the for the NWL MIPI-DSI host.
>
> To my best understanding a bridge is something that converts from one
> format to another format.
> Something that in the drm world are connected to an encoder.
>
> I do not know the HW here - but from this very brif description this
> sounds more like a display controller and not a bridge?
I would call it an encoder, that's the term usually employed for such
devices (similar to HDMI encoder).
> > +
> > +Required properties:
> > +- compatible: "fsl,<chip>-nwl-dsi"
> > + The following strings are expected:
> > + "fsl,imx8mq-nwl-dsi"
> > +- reg: the register range of the MIPI-DSI controller
> > +- interrupts: the interrupt number for this module
> > +- clock, clock-names: phandles to the MIPI-DSI clocks
> > + The following clocks are expected on all platforms:
> > + "core" - DSI core clock
> > + "tx_esc" - TX_ESC clock (used in escape mode)
> > + "rx_esc" - RX_ESC clock (used in escape mode)
> > + "phy_ref" - PHY_REF clock. Clock is managed by the phy. Only
> > + used to read the clock rate.
> > +- assigned-clocks: phandles to clocks that require initial configuration
> > +- assigned-clock-rates: rates of the clocks that require initial configuration
> > + The following clocks need to have an initial configuration:
> > + "tx_esc" (20 MHz) and "rx_esc" (80 Mhz).
> > +- phys: phandle to the phy module representing the DPHY
> > + inside the MIPI-DSI IP block
> > +- phy-names: should be "dphy"
> > +
> > +Optional properties:
> > +- power-domains phandle to the power domain
> > +- src phandle to the system reset controller (required on
> > + i.MX8MQ)
> Name is not very descriptive.
> Other bindings seems to use "resets" here?
>
> > +- mux-sel phandle to the MUX register set (required on i.MX8MQ)
> > +- assigned-clock-parents phandles to parent clocks that needs to be assigned as
> > + parents to clocks defined in assigned-clocks
> > +
> > +Example:
> > + mipi_dsi: mipi_dsi@...00000 {
> > + #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>;
> > + clock-names = "core", "rx_esc", "tx_esc", "phy_ref";
> > + assigned-clocks = <&clk IMX8MQ_CLK_DSI_AHB>,
> > + <&clk IMX8MQ_CLK_DSI_CORE>,
> > + <&clk IMX8MQ_CLK_DSI_IPG_DIV>;
> > + assigned-clock-parents = <&clk IMX8MQ_SYS1_PLL_80M>,
> > + <&clk IMX8MQ_SYS1_PLL_266M>;
> > + assigned-clock-rates = <80000000>,
> > + <266000000>,
> > + <20000000>;
> > + interrupts = <GIC_SPI 34 IRQ_TYPE_LEVEL_HIGH>;
> > + power-domains = <&pgc_mipi>;
> > + src = <&src>;
> > + mux-sel = <&iomuxc_gpr>;
> > + phys = <&dphy>;
> > + phy-names = "dphy";
> > + status = "okay";
> I recall status should not be included in examples.
>
> > +
> > + panel@0 {
> > + compatible = "...";
> > + port {
> > + panel_in: endpoint {
> > + remote-endpoint = <&mipi_dsi_out>;
> > + };
> > + };
> > + };
> > +
> > + ports {
> > + #address-cells = <1>;
> > + #size-cells = <0>;
> > +
> > + port@0 {
> > + reg = <0>;
> > + mipi_dsi_in: endpoint {
> > + remote-endpoint = <&dcss_disp0_mipi_dsi>;
> > + };
> > + };
> > + port@1 {
> > + reg = <1>;
> > + mipi_dsi_out: endpoint {
> > + remote-endpoint = <&panel_in>;
> > + };
> > + };
> > + };
> > + };
--
Regards,
Laurent Pinchart
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