linux-kernel - Re: [PATCH v2 9/9] ARM: dts: chameleonv3: Add video device nodes

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Date: Mon, 26 Feb 2024 12:09:39 +0100
From: Paweł Anikiel <panikiel@...gle.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: airlied@...il.com, akpm@...ux-foundation.org, conor+dt@...nel.org, 
	daniel@...ll.ch, dinguyen@...nel.org, hverkuil-cisco@...all.nl, 
	krzysztof.kozlowski+dt@...aro.org, maarten.lankhorst@...ux.intel.com, 
	mchehab@...nel.org, mripard@...nel.org, robh+dt@...nel.org, 
	tzimmermann@...e.de, devicetree@...r.kernel.org, 
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
	linux-media@...r.kernel.org, chromeos-krk-upstreaming@...gle.com, 
	ribalda@...omium.org
Subject: Re: [PATCH v2 9/9] ARM: dts: chameleonv3: Add video device nodes

On Mon, Feb 26, 2024 at 10:15 AM Krzysztof Kozlowski
<krzysztof.kozlowski@...aro.org> wrote:
>
> On 21/02/2024 17:02, Paweł Anikiel wrote:
> > Add device nodes for the video system present on the Chameleon v3.
> > It consists of six framebuffers and two Intel Displayport receivers.
> >
> > Signed-off-by: Paweł Anikiel <panikiel@...gle.com>
> > ---
>
> ...
>
> > +             dprx_sst: dp-receiver@...64000 {
> > +                     compatible = "intel,dprx-20.0.1";
> > +                     reg = <0xc0064000 0x800>;
> > +                     interrupt-parent = <&dprx_sst_irq>;
> > +                     interrupts = <0 IRQ_TYPE_EDGE_RISING>;
> > +                     intel,max-link-rate = <0x1e>;
>
> Rate is not in hex! Rate is in Hz, at least usually...
>
> Fix your bindings...

This is the DisplayPort link rate, for which the allowed values are
8.1 Gbps, 5.4 Gbps, 2.7 Gbps, or 1.62 Gbps. The standard way to encode
them (used in the DisplayPort DPCD registers and this device's
configuration) is by multiples of 0.27Gbps. This value (AFAIK) is
usually represented in hex, so 8.1Gbps would be 0x1e.