lkml.org 
[lkml]   [2020]   [Mar]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v4 1/4] dt-bindings: Add binding for the Analogix ANX7688 chip
On Wed, Mar 18, 2020 at 08:07:27AM +0100, Enric Balletbo i Serra wrote:
> The ANX7688 chip is a Type-C Port Controller, HDMI to DP converter and
> USB-C mux between USB 3.0 lanes and the DP output.
>
> For our use case a big part of the chip, like power supplies, control
> gpios and the usb-c part is managed by an Embedded Controller, hence,
> this is its simplest form of the binding. We'd prefer introduce these
> properties for someone with a different use case so they can test
> on their hardware.

I'm not sure this is a move in the right direction from the prior
version. Just because you have multiple functions that doesn't mean
the DT has multiple child nodes. What's a 'function' exactly may vary
by OS (or in time). Are the USB-C functions separate h/w? Are there
separate resources for each sub-function that need to be defined in DT?

We do need to be able to construct a graph with this device, HDMI
output, USB host, and USB connector. That may dictate what does or
doesn't work here.

> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
> ---
>
> Changes in v4: None
> Changes in v3:
> - Add binding for ANX7688 multi-function device.
>
> Changes in v2: None
>
> .../bindings/mfd/analogix,anx7688.yaml | 48 +++++++++++++++++++
> 1 file changed, 48 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/mfd/analogix,anx7688.yaml
>
> diff --git a/Documentation/devicetree/bindings/mfd/analogix,anx7688.yaml b/Documentation/devicetree/bindings/mfd/analogix,anx7688.yaml
> new file mode 100644
> index 000000000000..bb95a4e87188
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/analogix,anx7688.yaml
> @@ -0,0 +1,48 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mfd/analogix,anx7688.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Analogix ANX7688 HDMI to USB Type-C Bridge (Port Controller with MUX)
> +
> +maintainers:
> + - Nicolas Boichat <drinkcat@chromium.org>
> + - Enric Balletbo i Serra <enric.balletbo@collabora.com>
> +
> +description: |
> + ANX7688 converts HDMI 2.0 to DisplayPort 1.3 Ultra-HDi (4096x2160p60)
> + including an intelligent crosspoint switch to support USB Type-C (USB-C).
> + The integrated crosspoint switch supports USB 3.1 data transfer along with
> + the DisplayPort Alternate Mode signaling over USB Type-C. Additionally,
> + an on-chip microcontroller (OCM) is available to manage the signal switching,
> + Channel Configuration (CC) detection, USB Power Delivery (USB-PD), Vendor
> + Defined Message (VDM) protocol support and other functions as defined in the
> + USB TypeC and USB Power Delivery specifications.
> +
> + As a result, a multi-function device is exposed as parent of the video
> + bridge, TCPC and MUX blocks.
> +
> +properties:
> + compatible:
> + const: analogix,anx7688
> +
> + reg:
> + maxItems: 1
> + description: I2C address of the device
> +
> +required:
> + - compatible
> + - reg

If this does stay like this, then you need to define the child node(s)
here and reference their bindings.

> +
> +examples:
> + - |
> + i2c0 {
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + anx7688: anx7688@2c {
> + compatible = "analogix,anx7688";
> + reg = <0x2c>;
> + };
> + };
> --
> 2.25.1
>

\
 
 \ /
  Last update: 2020-03-31 00:59    [W:0.086 / U:3.964 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site