linux-kernel - Re: [PATCH v3 6/6] watchdog: ts4600: add driver for TS-4600 watchdog

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Date:   Mon, 15 May 2017 10:00:02 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Sebastien Bourdelin <sebastien.bourdelin@...oirfairelinux.com>,
        robh@...nel.org, linux-watchdog@...r.kernel.org,
        mark@...eddedarm.com, devicetree@...r.kernel.org,
        linus.walleij@...aro.org, linux-kernel@...r.kernel.org,
        kris@...eddedarm.com, kernel@...oirfairelinux.com,
        fabio.estevam@....com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 6/6] watchdog: ts4600: add driver for TS-4600 watchdog

On Sun, May 14, 2017 at 07:39:33AM -0700, Guenter Roeck wrote:
> On 05/11/2017 12:22 AM, Shawn Guo wrote:
> >On Fri, May 05, 2017 at 03:32:59PM -0400, Sebastien Bourdelin wrote:
> >>This watchdog is instantiated in a FPGA and can only be access using a
> >>GPIOs bit-banged bus, called the NBUS by Technologic Systems.
> >>The watchdog is made of only one register, called the feed register.
> >>Writing to this register will re-arm the watchdog for a given time (and
> >>enable it if it was disable). It can be disabled by writing a special
> >>value into it.
> >>
> >>Signed-off-by: Sebastien Bourdelin <sebastien.bourdelin@...oirfairelinux.com>
> >>---
> >>Changes v2 -> v3:
> >>  - rebase on master
> >>  - remove the timeout table to simplify the logic (suggested by
> >>  Guenter Roeck)
> >>  - fix the set_timeout function (suggested by Guenter Roeck)
> >>  - hardcode the max_hw_heartbeat_ms value based on the ts4600 max
> >>  timeout value supported (suggested by Guenter Roeck)
> >>  - remove the max_timeout usage and set a default timeout value
> >>(suggested by Guenter Roeck)
> >>  - use the devm_watchdog_register_device function instead of
> >>  watchdog_register_device (suggested by Guenter Roeck)
> >>
> >>Changes v1 -> v2:
> >>  - rebase on master
> >>  - retrieve the ts_nbus instantiated by the parent node (suggested by
> >>  Linus Walleij)
> >>  - rename the wdt by watchdog in the device tree and in the
> >>  documentation (suggested by Rob Herring)
> >>  - add a dependency to the TS_NBUS driver in the Kconfig (suggested by
> >>  Guenter Roeck)
> >>  - simplify the set_timeout function (suggested by Guenter Roeck)
> >>  - use the max_hw_heartbeat_ms callback instead of the max_timeout
> >>  callback (suggested by Guenter Roeck)
> >>---
> >> .../devicetree/bindings/watchdog/ts4600-wdt.txt    |  16 ++
> >> arch/arm/boot/dts/imx28-ts4600-common.dtsi         |   5 +
> >
> >The dts change shouldn't be mixed within driver patch.
> >
> 
> Maybe, but Rob Acked the devicetree changes, so I don't see a reason
> for splitting it up now.

What Rob Acked is devicetree bindings, and ARM dts changes should
normally go via arm-soc tree, unless there is a good reason they
shouldn't.

Shawn