From: Stefan Agner <stefan@agner.ch>
To: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: linus.walleij@linaro.org, airlied@linux.ie, robh+dt@kernel.org,
mark.rutland@arm.com, shawnguo@kernel.org,
s.hauer@pengutronix.de, p.zabel@pengutronix.de,
kernel@pengutronix.de, fabio.estevam@nxp.com, linux-imx@nxp.com,
architt@codeaurora.org, a.hajda@samsung.com, gustavo@padovan.org,
maarten.lankhorst@linux.intel.com, sean@poorly.run,
marcel.ziswiler@toradex.com, max.krummenacher@toradex.com,
dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/6] dt-bindings: display: add data-enable polarity property
Date: Wed, 05 Sep 2018 11:10:08 -0700 [thread overview]
Message-ID: <e708c5bac502e60a2eeb685fddf67042@agner.ch> (raw)
In-Reply-To: <139651706.L0sBFfZMDQ@avalon>
On 05.09.2018 00:07, Laurent Pinchart wrote:
> Hi Stefan,
>
> Thank you for the patch.
>
> On Wednesday, 5 September 2018 08:21:10 EEST Stefan Agner wrote:
>> Allow to specify the data-enable polarity required by a dumb VGA
>> DAC converting parallel RGB to VGA.
>>
>> Signed-off-by: Stefan Agner <stefan@agner.ch>
>> ---
>> .../devicetree/bindings/display/bridge/dumb-vga-dac.txt | 1 +
>> 1 file changed, 1 insertion(+)
>>
>> diff --git
>> a/Documentation/devicetree/bindings/display/bridge/dumb-vga-dac.txt
>> b/Documentation/devicetree/bindings/display/bridge/dumb-vga-dac.txt index
>> 164cbb15f04c..adbd2ca0af2f 100644
>> --- a/Documentation/devicetree/bindings/display/bridge/dumb-vga-dac.txt
>> +++ b/Documentation/devicetree/bindings/display/bridge/dumb-vga-dac.txt
>> @@ -18,6 +18,7 @@ graph bindings specified in
>> Documentation/devicetree/bindings/graph.txt.
>>
>> Optional properties:
>> - vdd-supply: Power supply for DAC
>> +- de-active: data-enable pulse is active low/high/ignored
>
> Which value corresponds to low, high and ignored ?
>
The wording is taken from
Documentation/devicetree/bindings/display/panel/display-timing.txt. But
I agree, not very useful.
0 is low active, 1 is high active, and none is using driver defaults.
How about:
- de-active: data-enable pulse is 0=active low/1=active high
--
Stefan
>> Example
>> -------
next prev parent reply other threads:[~2018-09-05 18:10 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-05 5:21 [PATCH 1/6] drm/bridge: use bus flags in bridge timings Stefan Agner
2018-09-05 5:21 ` [PATCH 2/6] drm/bridge: allow to specify data-enable polarity Stefan Agner
2018-09-05 5:21 ` [PATCH 3/6] dt-bindings: display: add data-enable polarity property Stefan Agner
2018-09-05 7:07 ` Laurent Pinchart
2018-09-05 18:10 ` Stefan Agner [this message]
2018-09-05 20:50 ` Laurent Pinchart
2018-09-05 5:21 ` [PATCH 4/6] drm/imx: support handling bridge timings bus flags Stefan Agner
2018-09-05 5:21 ` [PATCH 5/6] ARM: dts: imx6qdl-apalis: add VGA support Stefan Agner
2018-09-05 5:21 ` [PATCH 6/6] ARM: dts: imx6qdl-apalis: add GPIO I2C node for DDC Stefan Agner
2018-09-05 7:06 ` [PATCH 1/6] drm/bridge: use bus flags in bridge timings Laurent Pinchart
2018-09-05 7:44 ` Laurent Pinchart
2018-09-05 18:32 ` Stefan Agner
2018-09-06 11:07 ` Linus Walleij
2018-09-06 12:25 ` Laurent Pinchart
2018-09-06 16:48 ` Stefan Agner
2018-09-06 16:54 ` Laurent Pinchart
2018-09-06 17:27 ` Stefan Agner
2018-09-06 20:25 ` Stefan Agner
2018-09-07 7:10 ` Linus Walleij
2018-09-07 18:25 ` Stefan Agner
2018-09-14 9:55 ` Laurent Pinchart
2018-09-14 9:49 ` Laurent Pinchart
2018-09-14 9:57 ` Laurent Pinchart
2018-09-19 7:03 ` Stefan Agner
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