From: Stephen Warren <swarren@wwwdotorg.org>
To: Laxman Dewangan <ldewangan@nvidia.com>
Cc: thierry.reding@gmail.com, linus.walleij@linaro.org,
gnurou@gmail.com, robh+dt@kernel.org, mark.rutland@arm.com,
jonathanh@nvidia.com, linux-tegra@vger.kernel.org,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-gpio@vger.kernel.org
Subject: Re: [PATCH 6/7] pinctrl: tegra: Add DT binding for io pads control
Date: Fri, 15 Apr 2016 10:35:11 -0600 [thread overview]
Message-ID: <5711183F.1090003@wwwdotorg.org> (raw)
In-Reply-To: <1460473007-11535-7-git-send-email-ldewangan@nvidia.com>
On 04/12/2016 08:56 AM, Laxman Dewangan wrote:
> NVIDIA Tegra210 supports the IO pads which can operate at 1.8V
> or 3.3V I/O voltage levels. Also IO pads can be configured for
> power down state if it is not in used. SW needs to configure the
> voltage level of IO pads based on IO rail voltage and its power
> state based on platform usage.
>
> Add DT binding document for detailing the DT properties for
> configuring IO pads voltage levels and its power state.
I hope that we only intend to use this in the case where Linux must make
dynamic changes to the IO voltage (e.g. SD cards switching between speeds).
All static settings, and good boot defaults, should be set up by system
FW. Perhaps not all FW does this on Tegra210 platforms:-( I hope that on
future chips, the same FW that sets up the static pinmux sets up the
static IO voltage configuration, in exactly the same way.
next prev parent reply other threads:[~2016-04-15 16:35 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-12 14:56 [PATCH 0/7] pinctrl: soc/tegra: Add support to configure IO rail voltage and pad power states Laxman Dewangan
[not found] ` <1460473007-11535-1-git-send-email-ldewangan-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-04-12 14:56 ` [PATCH 1/7] soc/tegra: pmc: Use BIT macro for register field definition Laxman Dewangan
[not found] ` <1460473007-11535-2-git-send-email-ldewangan-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-04-12 15:26 ` Thierry Reding
2016-04-12 16:58 ` Laxman Dewangan
2016-04-15 7:44 ` Linus Walleij
2016-04-12 14:56 ` [PATCH 2/7] soc/tegra: pmc: Add new Tegra210 IO rails Laxman Dewangan
[not found] ` <1460473007-11535-3-git-send-email-ldewangan-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-04-12 15:28 ` Thierry Reding
[not found] ` <20160412152830.GB30211-EkSeR96xj6Pcmrwk2tT4+A@public.gmane.org>
2016-04-12 16:59 ` Laxman Dewangan
2016-04-12 18:03 ` Jon Hunter
2016-04-12 17:57 ` Laxman Dewangan
2016-04-12 14:56 ` [PATCH 3/7] soc/tegra: pmc: Add interface to get IO rail power status Laxman Dewangan
[not found] ` <1460473007-11535-4-git-send-email-ldewangan-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-04-12 18:06 ` kbuild test robot
2016-04-12 18:13 ` Jon Hunter
2016-04-12 14:56 ` [PATCH 4/7] soc/tegra: pmc: Add interface to set voltage of IO rails Laxman Dewangan
2016-04-13 8:47 ` Jon Hunter
2016-04-13 9:00 ` Laxman Dewangan
2016-04-13 9:25 ` Jon Hunter
[not found] ` <570E109D.6070805-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-04-13 9:20 ` Laxman Dewangan
2016-04-13 9:56 ` Jon Hunter
[not found] ` <1460473007-11535-5-git-send-email-ldewangan-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-04-15 7:54 ` Linus Walleij
[not found] ` <CACRpkdbueJ=0+WtNefQ7GHoqU5HY7WFYjL2geFq4vkpTbZesZA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-04-15 8:00 ` Mark Brown
[not found] ` <20160415080027.GB3217-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2016-04-15 8:25 ` Laxman Dewangan
[not found] ` <5710A583.2010102-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-04-15 9:19 ` Linus Walleij
2016-04-15 16:24 ` Stephen Warren
2016-04-15 16:21 ` Laxman Dewangan
[not found] ` <57111524.60708-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-04-15 16:41 ` Stephen Warren
[not found] ` <571119D5.3040309-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2016-04-15 16:33 ` Laxman Dewangan
2016-04-15 16:59 ` Stephen Warren
2016-04-12 14:56 ` [PATCH 5/7] soc/tegra: pmc: Register sub-devices of PMC Laxman Dewangan
[not found] ` <1460473007-11535-6-git-send-email-ldewangan-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-04-15 16:31 ` Stephen Warren
2016-04-12 14:56 ` [PATCH 6/7] pinctrl: tegra: Add DT binding for io pads control Laxman Dewangan
2016-04-13 9:04 ` Jon Hunter
[not found] ` <570E0BAE.8090404-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-04-13 9:08 ` Laxman Dewangan
2016-04-13 9:31 ` Jon Hunter
2016-04-15 14:16 ` Jon Hunter
2016-04-15 14:12 ` Laxman Dewangan
[not found] ` <5710F6CA.6060700-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-04-15 15:14 ` Jon Hunter
[not found] ` <57110560.80004-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-04-15 15:14 ` Laxman Dewangan
2016-04-15 15:45 ` Jon Hunter
2016-04-15 16:41 ` Laxman Dewangan
2016-04-15 17:44 ` Jon Hunter
[not found] ` <5711288D.7060701-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-04-15 17:49 ` Laxman Dewangan
2016-04-15 18:30 ` Jon Hunter
[not found] ` <57113340.6090701-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-04-15 18:43 ` Laxman Dewangan
2016-04-15 16:35 ` Stephen Warren [this message]
2016-04-15 16:31 ` Laxman Dewangan
2016-04-12 14:56 ` [PATCH 7/7] pinctrl: tegra: Add driver to configure voltage and power state of io pads Laxman Dewangan
2016-04-15 8:08 ` Linus Walleij
2016-04-15 8:39 ` Laxman Dewangan
2016-04-15 9:25 ` Linus Walleij
2016-04-15 9:55 ` Laxman Dewangan
2016-04-15 11:15 ` Linus Walleij
[not found] ` <CACRpkdbr-9Z1JKMVmwNFyMq+Pg+3hT5c9rKZ1y4wZecnidW9Cg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-04-15 11:47 ` Laxman Dewangan
2016-04-15 14:03 ` Linus Walleij
2016-04-15 13:59 ` Laxman Dewangan
[not found] ` <5710F3DC.7090906-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-04-19 9:49 ` Laxman Dewangan
2016-04-26 13:32 ` Laxman Dewangan
2016-04-26 15:31 ` Stephen Warren
[not found] ` <5710A8A4.90309-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-04-15 16:38 ` Stephen Warren
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