From: akshay.bhat@timesys•com (Akshay Bhat)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH v5 1/2] watchdog: imx2_wdt: add external reset support via dt prop
Date: Fri, 1 Apr 2016 12:31:38 -0400 [thread overview]
Message-ID: <56FEA26A.5020805@timesys.com> (raw)
In-Reply-To: <1459523804-11390-2-git-send-email-tharvey@gateworks.com>
On 04/01/2016 11:16 AM, Tim Harvey wrote:
> The IMX6 watchdog supports assertion of a signal (WDOG_B) which
> can be pinmux'd to an external pin. This is typically used for boards that
> have PMIC's in control of the IMX6 power rails. In fact, failure to use
> such an external reset on boards with external PMIC's can result in various
> hangs due to the IMX6 not being fully reset [1] as well as the board failing
> to reset because its PMIC has not been reset to provide adequate voltage for
> the CPU when coming out of reset at 800Mhz.
>
> This uses a new device-tree property 'fsl,ext-reset-output' to indicate the
> board has such a reset and to cause the watchdog to be configured to assert
> WDOG_B instead of an internal reset both on a watchdog timeout and in
> system_restart.
>
> [1] http://lists.infradead.org/pipermail/linux-arm-kernel/2015-March/333689.html
>
> Cc: Fabio Estevam <festevam@gmail•com>
> Cc: Lucas Stach <l.stach@pengutronix•de>
> Cc: Stefan Roese <sr@denx•de>
> Cc: Iain Paton <ipaton0@gmail•com>
> Cc: Sascha Hauer <s.hauer@pengutronix•de>
> Cc: Akshay Bhat <akshay.bhat@timesys•com>
> Cc: Guenter Roeck <linux@roeck-us•net>
> Signed-off-by: Tim Harvey <tharvey@gateworks•com>
> Reviewed-by: Lucas Stach <l.stach@pengutronix•de>
> Acked-by: Shawn Guo <shawn.guo@linaro•org>
> ---
> v5:
> - rename property to 'fsl,ext-reset-output'
> v4:
> - change Property to Properties in documentation
> v3:
> - mandate use of 'either' internal or external reset but not both
> simultaneously
> v2:
> - rename property to 'ext-reset-output' based on ML feedback
> - simplify setting SRS bit if external-reset
> - update comments and commit msg
>
> Signed-off-by: Tim Harvey <tharvey@gateworks•com>
> ---
Tested-by: Akshay Bhat <akshay.bhat@timesys•com>
next prev parent reply other threads:[~2016-04-01 16:31 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-01 15:16 [PATCH v5 0/2] imx6: Implement external watchdog reset Tim Harvey
2016-04-01 15:16 ` [PATCH v5 1/2] watchdog: imx2_wdt: add external reset support via dt prop Tim Harvey
2016-04-01 16:31 ` Akshay Bhat [this message]
2016-04-08 1:09 ` Guenter Roeck
2016-04-18 16:05 ` Akshay Bhat
2016-04-01 15:16 ` [PATCH v5 2/2] ARM: dts: imx: ventana: Add wdt ext-reset support Tim Harvey
2016-04-08 1:10 ` Guenter Roeck
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=56FEA26A.5020805@timesys.com \
--to=akshay.bhat@timesys$(echo .)com \
--cc=linux-arm-kernel@lists$(echo .)infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
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