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Message-ID: <20191011125418.GE4882@pendragon.ideasonboard.com>
Date: Fri, 11 Oct 2019 15:54:18 +0300
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Andrzej Hajda <a.hajda@...sung.com>
Cc: Xin Ji <xji@...logixsemi.com>,
"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
Neil Armstrong <narmstrong@...libre.com>,
Jonas Karlman <jonas@...boo.se>,
Jernej Skrabec <jernej.skrabec@...l.net>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
Dan Carpenter <dan.carpenter@...cle.com>,
Nicolas Boichat <drinkcat@...omium.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
Sheng Pan <span@...logixsemi.com>
Subject: Re: [PATCH v2 1/2] dt-bindings: drm/bridge: anx7625: MIPI to DP
transmitter binding
Hi Andrzej,
On Fri, Oct 11, 2019 at 01:21:43PM +0200, Andrzej Hajda wrote:
> On 11.10.2019 04:21, Xin Ji wrote:
> > The ANX7625 is an ultra-low power 4K Mobile HD Transmitter designed
> > for portable device. It converts MIPI to DisplayPort 1.3 4K.
> >
> > You can add support to your board with binding.
> >
> > Example:
> > anx7625_bridge: encoder@58 {
> > compatible = "analogix,anx7625";
> > reg = <0x58>;
> > status = "okay";
> > panel-flags = <1>;
> > enable-gpios = <&pio 45 GPIO_ACTIVE_HIGH>;
> > reset-gpios = <&pio 73 GPIO_ACTIVE_HIGH>;
> > #address-cells = <1>;
> > #size-cells = <0>;
> >
> > port@0 {
> > reg = <0>;
> > anx_1_in: endpoint {
> > remote-endpoint = <&mipi_dsi>;
> > };
> > };
> >
> > port@3 {
> > reg = <3>;
> > anx_1_out: endpoint {
> > remote-endpoint = <&panel_in>;
> > };
> > };
> > };
> >
> > Signed-off-by: Xin Ji <xji@...logixsemi.com>
> > ---
> > .../bindings/display/bridge/anx7625.yaml | 96 ++++++++++++++++++++++
> > 1 file changed, 96 insertions(+)
> > create mode 100644 Documentation/devicetree/bindings/display/bridge/anx7625.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/display/bridge/anx7625.yaml b/Documentation/devicetree/bindings/display/bridge/anx7625.yaml
> > new file mode 100644
> > index 0000000..fc84683
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/display/bridge/anx7625.yaml
> > @@ -0,0 +1,96 @@
> > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> > +# Copyright 2019 Analogix Semiconductor, Inc.
> > +%YAML 1.2
> > +---
> > +$id: "http://devicetree.org/schemas/display/bridge/anx7625.yaml#"
> > +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> > +
> > +title: Analogix ANX7625 SlimPort (4K Mobile HD Transmitter)
> > +
> > +maintainers:
> > + - Xin Ji <xji@...logixsemi.com>
> > +
> > +description: |
> > + The ANX7625 is an ultra-low power 4K Mobile HD Transmitter
> > + designed for portable devices.
> > +
> > +properties:
> > + "#address-cells": true
> > + "#size-cells": true
> > +
> > + compatible:
> > + items:
> > + - const: analogix,anx7625
> > +
> > + reg:
> > + maxItems: 1
> > +
> > + panel-flags:
> > + description: indicate the panel is internal or external
> > + maxItems: 1
> > +
> > + interrupts:
> > + maxItems: 1
> > +
> > + enable-gpios:
> > + description: used for power on chip control, POWER_EN pin D2.
> > + maxItems: 1
> > +
> > + reset-gpios:
> > + description: used for reset chip control, RESET_N pin B7.
> > + maxItems: 1
> > +
> > + port@0:
> > + type: object
> > + description:
> > + A port node pointing to MIPI DSI host port node.
> > +
> > + port@1:
> > + type: object
> > + description:
> > + A port node pointing to MIPI DPI host port node.
> > +
> > + port@2:
> > + type: object
> > + description:
> > + A port node pointing to external connector port node.
> > +
> > + port@3:
> > + type: object
> > + description:
> > + A port node pointing to eDP port node.
>
>
> Decrypting available product brief[1], there are following physical lines:
>
> Input:
>
> - MIPI DSI/DPI - video data, are DSI and DPI lines shared?
It would be much easier if we could have access to more complete
information. I believe the DSI and DPI pins could be muxed, but there
should be more DPI pins than DSI pins.
>
> - I2S - audio data,
>
> - I2C - control line,
>
> - ALERT/INTP - interrupt,
>
> - USB 3.1 SSRc/Tx - for USB forwarding,
>
> Output:
>
> - SS1, SS2,
>
> - SBU/AUX,
>
> - CC1/2.
>
>
> Having this information I try to understand ports defined by you:
>
> - port@2 you have defined as pointing to external port, but here the
> port should be rather subnode of ANX7625 - the chip has CC lines, see
> beginning of [2].
>
> - port@3 describes SS1, SS2 and SBU/AUX lines together, am I right? In
> USB-C binding SBU and SS lines are represented by different ports,
> different approach, but maybe better in this case.
I believe that, when connected to a DP display (either DP or eDP), the
DisplayPort signals are output on SS1 and/or SS2. I this really wonder
if we need two separate ports for this, it seems that port@2 and port@3
should be merged.
> Maybe it would be good to add 2nd example with USB-C port.
That would help with the discussion, yes.
> [1]:
> https://www.analogix.com/system/files/AA-002291-PB-6-ANX7625_ProductBrief.pdf
>
> [2]: Documentation/devicetree/bindings/connector/usb-connector.txt
>
> > +
> > +required:
> > + - "#address-cells"
> > + - "#size-cells"
> > + - compatible
> > + - reg
> > + - port@0
> > + - port@3
> > +
> > +example:
> > + - |
> > + anx7625_bridge: encoder@58 {
> > + compatible = "analogix,anx7625";
> > + reg = <0x58>;
> > + status = "okay";
> > + panel-flags = <1>;
> > + enable-gpios = <&pio 45 GPIO_ACTIVE_HIGH>;
> > + reset-gpios = <&pio 73 GPIO_ACTIVE_HIGH>;
> > + #address-cells = <1>;
> > + #size-cells = <0>;
> > +
> > + port@0 {
> > + reg = <0>;
> > + anx_1_in: endpoint {
> > + remote-endpoint = <&mipi_dsi>;
> > + };
> > + };
> > +
> > + port@3 {
> > + reg = <3>;
> > + anx_1_out: endpoint {
> > + remote-endpoint = <&panel_in>;
> > + };
> > + };
> > + };
--
Regards,
Laurent Pinchart
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