From: Tony Lindgren <tony@atomide.com>
To: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: linux-omap@vger.kernel.org, devicetree@vger.kernel.org,
robh+dt@kernel.org, mark.rutland@arm.com,
dri-devel@lists.freedesktop.org
Subject: Re: [PATCH 1/4] ARM: dts: am437x-gp-evm: add HDMI support
Date: Thu, 12 Dec 2019 09:21:04 -0800 [thread overview]
Message-ID: <20191212172104.GY35479@atomide.com> (raw)
In-Reply-To: <20191125131100.9839-1-tomi.valkeinen@ti.com>
Hi,
* Tomi Valkeinen <tomi.valkeinen@ti.com> [191125 05:11]:
> Add HDMI support for AM437x GP EVM. The HDMI uses SiI9022 HDMI encoder,
> and is mutually exclusive with the LCD. The choice between LCD and HDMI
> is made by booting either with am437x-gp-evm.dtb or
> am437x-gp-evm-hdmi.dtb.
So Linux kernel needs a new board device tree file to toggle a GPIO line
to switch between LCD mode and HDMI?
That does not sound very user friendly for something that's supposed
to be hot pluggabe :)
> +/* Override SelLCDorHDMI from am437x-gp-evm.dts to select HDMI */
> +&gpio5 {
> + p8 {
> + output-low;
> + };
> +};
How about just leave the gpio unconfigured and document that a userspace
tool or /sys/kernel/debug/gpio is needed to toggle between the modes?
Regards,
Tony
next prev parent reply other threads:[~2019-12-12 17:21 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-25 13:10 [PATCH 1/4] ARM: dts: am437x-gp-evm: add HDMI support Tomi Valkeinen
2019-11-25 13:10 ` [PATCH 2/4] ARM: dts: am437x-epos-evm: " Tomi Valkeinen
2019-11-25 13:10 ` [PATCH 3/4] ARM: dts: dra76-evm: add HDMI output Tomi Valkeinen
2019-11-25 13:11 ` [PATCH 4/4] ARM: dts: am57xx-idk-common: add HDMI to the common dtsi Tomi Valkeinen
2019-12-12 17:21 ` Tony Lindgren [this message]
2019-12-12 17:31 ` [PATCH 1/4] ARM: dts: am437x-gp-evm: add HDMI support Tony Lindgren
2019-12-13 9:24 ` Tomi Valkeinen
2019-12-13 10:42 ` Laurent Pinchart
2019-12-13 10:56 ` Tomi Valkeinen
2019-12-13 11:42 ` Laurent Pinchart
2019-12-13 12:04 ` Tomi Valkeinen
2019-12-13 12:28 ` Laurent Pinchart
2019-12-13 12:33 ` Tomi Valkeinen
2019-12-13 14:57 ` Tony Lindgren
2019-12-13 12:36 ` Tomi Valkeinen
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20191212172104.GY35479@atomide.com \
--to=tony@atomide.com \
--cc=devicetree@vger.kernel.org \
--cc=dri-devel@lists.freedesktop.org \
--cc=linux-omap@vger.kernel.org \
--cc=mark.rutland@arm.com \
--cc=robh+dt@kernel.org \
--cc=tomi.valkeinen@ti.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).