linux-kernel - Re: [PATCH 0/3] Suspending i.MX watchdog in WAIT mode

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Message-ID: <5bf984f4-681c-7001-281f-f35bb7fdfc8b@linaro.org>
Date:   Wed, 19 Oct 2022 11:46:53 -0400
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Andrej Picej <andrej.picej@...ik.com>,
        linux-watchdog@...r.kernel.org
Cc:     shawnguo@...nel.org, linux@...ck-us.net,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-imx@....com, festevam@...il.com,
        kernel@...gutronix.de, s.hauer@...gutronix.de,
        wim@...ux-watchdog.org, robh+dt@...nel.org
Subject: Re: [PATCH 0/3] Suspending i.MX watchdog in WAIT mode

On 19/10/2022 07:17, Andrej Picej wrote:
> The i.MX6 watchdog can't be stopped once started. This means that
> special hardware suspend needs to be configured when the device enters
> low-power modes.
> Usually i.MX devices have two bits which deal with this:
> - WDZST bit disables the timer in "deeper" low power modes and
> - WDW bit disables the timer in "WAIT" mode which corresponds with
> Linux's "freeze" low-power mode.
> 
> WDZST bit support is already in place since 1a9c5efa576e ("watchdog: imx2_wdt: disable watchdog timer during low power mode").
> WDW bit is not common for all imx2-wdt supported devices, therefore use
> a new device-tree property "fsl,suspend-in-wait" which suspends the
> watchdog in "WAIT" mode.
> 
> Andrej Picej (3):
>   watchdog: imx2_wdg: suspend watchdog in WAIT mode
>   dt-bindings: watchdog: fsl-imx: document suspend in wait mode
>   ARM: dts: imx6ul/ull: suspend i.MX6UL watchdog in wait mode
> 
>  .../devicetree/bindings/watchdog/fsl-imx-wdt.yaml          | 5 +++++

Please use scripts/get_maintainers.pl to get a list of necessary people
and lists to CC.  It might happen, that command when run on an older
kernel, gives you outdated entries.  Therefore please be sure you base
your patches on recent Linux kernel.

Best regards,
Krzysztof