| Message ID | 20221019111714.1953262-1-andrej.picej@norik.com |
|---|---|
| Headers | show |
| Series | Suspending i.MX watchdog in WAIT mode | expand |
Hi Andrej, On Wed, Oct 19, 2022 at 8:17 AM Andrej Picej <andrej.picej@norik.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@gmail.com>
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(+)