[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Message-ID: <53e7df75-afdd-9bb0-aa45-f39d0756b139@linaro.org>
Date: Wed, 19 Jul 2023 19:10:40 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Viktar Simanenka <viteosen@...il.com>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>,
dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] dt-bindings: add bindings for pcd8544 displays
On 19/07/2023 17:44, Viktar Simanenka wrote:
> Signed-off-by: Viktar Simanenka <viteosen@...il.com>
You still miss commit msg.
>
> V2: deleted oneOf property from compatible
> changed prefix from 'philips' to existing vendor prefix 'nxp'
> placed `reg = <0>` right after `compatible`
That's not where the changelog is put. Please read again the patch, I
gave you link to.
>
> About parameters exposed for controller:
> inverted - I had an unbranded display that after reset had all pixels black,
> while register was in 'normal operation'. The display I have now is opposite:
> all white after reset in normal mode. This parameter should help user keep
> same settings in KMS(?) for diverse displays;
OK, it was enough to respond to my comment.
> voltage-op & temperature-coeff - adjusts contrast for display. voltage-op
> cannot be expressed in real units, because resulting equation looks like
> V = a + Vop * b, where a and b varies with ambient temperature. Vop is a
> coefficient. same story for temperature-coeff - it shifts resulting voltage
> curve depending on display usage invironment;
> bias - relates to waveforms for LCD segments. default is 4 and should be
> changed only if you use external oscillator for display.
Most of this could be in property description, not here.
Best regards,
Krzysztof
Powered by blists - more mailing lists