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

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Message-ID: <CAOMZO5Detga+MSrzb4ZjkPsaoat-rD9bv9235V9A+OG1Fy+L8g@mail.gmail.com>
Date:   Wed, 19 Oct 2022 09:16:23 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Andrej Picej <andrej.picej@...ik.com>
Cc:     linux-watchdog@...r.kernel.org, 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, 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

Hi Andrej,

On Wed, Oct 19, 2022 at 8:17 AM Andrej Picej <andrej.picej@...ik.com> 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

For the series:

Reviewed-by: Fabio Estevam <festevam@...il.com>