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

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Date:   Wed, 19 Oct 2022 13:17:11 +0200
From:   Andrej Picej <andrej.picej@...ik.com>
To:     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: [PATCH 0/3] Suspending i.MX watchdog in WAIT mode

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 +++++
 arch/arm/boot/dts/imx6ul-phytec-phycore-som.dtsi           | 4 ++++
 drivers/watchdog/imx2_wdt.c                                | 7 +++++++
 3 files changed, 16 insertions(+)

-- 
2.25.1