drivers: stm32_iwdg: move setup function in probe

Setup and probe are meaning mostly the same. Moving the `setup` function
content in probe improves readability.

Signed-off-by: Clément Le Goffic <c

drivers: stm32_iwdg: move setup function in probe

Setup and probe are meaning mostly the same. Moving the `setup` function
content in probe improves readability.

Signed-off-by: Clément Le Goffic <clement.legoffic@foss.st.com>
Acked-by: Gatien Chevallier <gatien.chevallier@foss.st.com>

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drivers: stm32_iwdg: change prescaler value to 1024

Increase the prescaler value to 1024 in order to increase watchdog
timeout value.
((2^12) * 1024) / 32767 = 128
It will allow watchdog timeout up

drivers: stm32_iwdg: change prescaler value to 1024

Increase the prescaler value to 1024 in order to increase watchdog
timeout value.
((2^12) * 1024) / 32767 = 128
It will allow watchdog timeout up to 128s.
Also multiply the IWDG_TIMEOUT_US by 4, same as the prescaler value.

Signed-off-by: Clément Le Goffic <clement.legoffic@foss.st.com>
Acked-by: Gatien Chevallier <gatien.chevallier@foss.st.com>

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drivers: stm32_iwdg: reload for stopped watchdog

For stopped watchdog, use the early interruption to reload the watchdog
without panic, the driver uses ULONG_MAX as an infinite reload indication.

S

drivers: stm32_iwdg: reload for stopped watchdog

For stopped watchdog, use the early interruption to reload the watchdog
without panic, the driver uses ULONG_MAX as an infinite reload indication.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Signed-off-by: Clément Le Goffic <clement.legoffic@foss.st.com>
Acked-by: Gatien Chevallier <gatien.chevallier@foss.st.com>

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drivers: stm32_iwdg: add support for extended watchdog timeout

This commit enhances the STM32 IWDG driver to support extended watchdog
timeouts.
It introduces new fields in the `stm32_iwdg_device` s

drivers: stm32_iwdg: add support for extended watchdog timeout

This commit enhances the STM32 IWDG driver to support extended watchdog
timeouts.
It introduces new fields in the `stm32_iwdg_device` structure, updates
the interrupt handler to handle multiple refresh cycles, and improves
the timeout handling logic to manage and calculate extended timeouts
accurately.

Signed-off-by: Clément Le Goffic <clement.legoffic@foss.st.com>
Acked-by: Gatien Chevallier <gatien.chevallier@foss.st.com>

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drivers: stm32_iwdg: add stop watchdog handler

Implement .stop watchdog handler in order to allow the platform to
`halt` well.

The platform does not allow a way to stop an IWDG once started but a
s

drivers: stm32_iwdg: add stop watchdog handler

Implement .stop watchdog handler in order to allow the platform to
`halt` well.

The platform does not allow a way to stop an IWDG once started but a
solution exists.
We disable the platform reset ability of the IWDG we use and the IRQ
associated if the reset property is present in the DT.

Be careful, on STM32MP2 platforms, in A35TDCID, the system reset of the
IWDG1 cannot be disabled. Therefore, only the IWDG2 can be stopped.
The same behavior applies for IWDG3 in M33TDCID, you'll have to use the
IWDG4.

Signed-off-by: Clément Le Goffic <clement.legoffic@foss.st.com>
Acked-by: Gatien Chevallier <gatien.chevallier@foss.st.com>

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drivers: stm32_iwdg: disable clocks during PM standby

Disable STM32 IWDG clock during low power state.

Signed-off-by: Etienne Carriere <etienne.carriere@foss.st.com>
Signed-off-by: Clément Le Goffi

drivers: stm32_iwdg: disable clocks during PM standby

Disable STM32 IWDG clock during low power state.

Signed-off-by: Etienne Carriere <etienne.carriere@foss.st.com>
Signed-off-by: Clément Le Goffic <clement.legoffic@foss.st.com>
Acked-by: Gatien Chevallier <gatien.chevallier@foss.st.com>

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drivers: stm32_iwdg: early watchdog interrupt

When the secure device tree defines an interrupt, register a handler
to notify secure world of a possible watchdog expiration.

Signed-off-by: Etienne C

drivers: stm32_iwdg: early watchdog interrupt

When the secure device tree defines an interrupt, register a handler
to notify secure world of a possible watchdog expiration.

Signed-off-by: Etienne Carriere <etienne.carriere@foss.st.com>
Signed-off-by: Clément Le Goffic <clement.legoffic@foss.st.com>
Acked-by: Gatien Chevallier <gatien.chevallier@foss.st.com>

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drivers: stm32_iwdg: check for error on clk_enable during probe

Check for the error returned by clk_enable() during the driver's
probe.
While there, if watchdog is started but we cannot control it,

drivers: stm32_iwdg: check for error on clk_enable during probe

Check for the error returned by clk_enable() during the driver's
probe.
While there, if watchdog is started but we cannot control it,
trigger panic instead of return error. This also avoids adding
useless clk_disable() in the error exit path.

Signed-off-by: Antonio Borneo <antonio.borneo@foss.st.com>
Reviewed-by: Etienne Carriere <etienne.carriere@foss.st.com>
Reviewed-by: Gatien Chevallier <gatien.chevallier@foss.st.com>

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drivers: stm32_iwdg: add get_timeleft watchdog handler

Implement .get_timeleft() watchdog operation handler for non-secure
world to query the watchdog device state. System time is logged at each
wat

drivers: stm32_iwdg: add get_timeleft watchdog handler

Implement .get_timeleft() watchdog operation handler for non-secure
world to query the watchdog device state. System time is logged at each
watchdog refresh to estimate time remaining before the watchdog elapses.

Signed-off-by: Antonio Borneo <antonio.borneo@foss.st.com>
Reviewed-by: Etienne Carriere <etienne.carriere@foss.st.com>
Reviewed-by: Gatien Chevallier <gatien.chevallier@foss.st.com>

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drivers: stm32_iwdg: remove OTP access in driver

Now we know if the watchdog is running by reading the hardware,
there is no need to read the OTP fuses related to the watchdog.
This allows removing

drivers: stm32_iwdg: remove OTP access in driver

Now we know if the watchdog is running by reading the hardware,
there is no need to read the OTP fuses related to the watchdog.
This allows removing platform function stm32_get_iwdg_otp_config()
and consequently stm32_iwdg.h header file.

Signed-off-by: Lionel Debieve <lionel.debieve@foss.st.com>
Signed-off-by: Antonio Borneo <antonio.borneo@foss.st.com>
Reviewed-by: Etienne Carriere <etienne.carriere@foss.st.com>
Reviewed-by: Gatien Chevallier <gatien.chevallier@foss.st.com>

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drivers: stm32_iwdg: probe if watchdog is running

Read from the hardware whether watchdog is already running when
core initializes. Relax timeout from 1 to 10ms to let the
watchdog warm-up when enab

drivers: stm32_iwdg: probe if watchdog is running

Read from the hardware whether watchdog is already running when
core initializes. Relax timeout from 1 to 10ms to let the
watchdog warm-up when enabled.

Signed-off-by: Antonio Borneo <antonio.borneo@foss.st.com>
Reviewed-by: Etienne Carriere <etienne.carriere@foss.st.com>
Reviewed-by: Gatien Chevallier <gatien.chevallier@foss.st.com>

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drivers: stm32_iwdg: remove useless device list

STM32 watchdog driver does not manage several instances of IWDG hence
remove the useless code. To simplify code, remove stm32_iwdg_register()
local fu

drivers: stm32_iwdg: remove useless device list

STM32 watchdog driver does not manage several instances of IWDG hence
remove the useless code. To simplify code, remove stm32_iwdg_register()
local function.

Signed-off-by: Etienne Carriere <etienne.carriere@foss.st.com>
Reviewed-by: Gatien Chevallier <gatien.chevallier@foss.st.com>

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drivers: stm32_iwdg: remove registering to shared_resources driver

Remove registering of STM32 IWDG driver to platform shared_resources
driver that is deprecated since integration of the firewall fr

drivers: stm32_iwdg: remove registering to shared_resources driver

Remove registering of STM32 IWDG driver to platform shared_resources
driver that is deprecated since integration of the firewall framework
in stm32mp1 platforms. Since this integration, OP-TEE only consider
IWDG secure instances hence remove the useless code for IWDG assigned
to non-secure world.

As watchdog drivers are only used when registering to OP-TEE watchdog
services (CFG_WDT_SM_HANDLER) simplify the code to always register
IWDG instance.

Signed-off-by: Etienne Carriere <etienne.carriere@foss.st.com>
Reviewed-by: Gatien Chevallier <gatien.chevallier@foss.st.com>

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drivers: stm32_iwdg: enable state helper functions

Add iwdg_wdt_set_enabled() to register the watchdog is activated
and rename is_enable() to iwdg_wdt_is_enabled() for consistency.

Acked-by: Jerome

drivers: stm32_iwdg: enable state helper functions

Add iwdg_wdt_set_enabled() to register the watchdog is activated
and rename is_enable() to iwdg_wdt_is_enabled() for consistency.

Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Signed-off-by: Etienne Carriere <etienne.carriere@foss.st.com>

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drivers: stm32_iwdg: enable bus clock once for all

Enable STM32 IWDG driver bus clock together with the IWDG kernel
clock when the driver is initialized. This clock is needed to propagate
IWDG early

drivers: stm32_iwdg: enable bus clock once for all

Enable STM32 IWDG driver bus clock together with the IWDG kernel
clock when the driver is initialized. This clock is needed to propagate
IWDG early interrupt to the system.

Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Signed-off-by: Etienne Carriere <etienne.carriere@foss.st.com>
Signed-off-by: Antonio Borneo <antonio.borneo@foss.st.com>

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drivers: stm32_iwdg: rename bus clock to clk_pclk

Rename STM32 IWDG watchdog bus clock clk_pclk, matching the reference
manual naming instead of clock.

Acked-by: Jerome Forissier <jerome.forissier@

drivers: stm32_iwdg: rename bus clock to clk_pclk

Rename STM32 IWDG watchdog bus clock clk_pclk, matching the reference
manual naming instead of clock.

Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Signed-off-by: Etienne Carriere <etienne.carriere@foss.st.com>

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drivers: stm32_iwdg: remove stm32_iwdg_refresh()

Remove unused stm32_iwdg_refresh() intended to refresh all registered
watchdog devices.

Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
Rev

drivers: stm32_iwdg: remove stm32_iwdg_refresh()

Remove unused stm32_iwdg_refresh() intended to refresh all registered
watchdog devices.

Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Signed-off-by: Etienne Carriere <etienne.carriere@foss.st.com>

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drivers: stm32_iwdg: provide timeout range

Implement watchdog service init handler that is needed by U-Boot
to get min/max timeout range.

Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
Re

drivers: stm32_iwdg: provide timeout range

Implement watchdog service init handler that is needed by U-Boot
to get min/max timeout range.

Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Signed-off-by: Etienne Carriere <etienne.carriere@foss.st.com>
Signed-off-by: Lionel Debieve <lionel.debieve@foss.st.com>

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drivers: stm32_iwdg: fix timeout configuration

Fix test on watchdog refresh command success used to program the
watchdog timeout.

Fixes: 0bdd7f5ba821 ("drivers: stm32_iwdg: implementation of indepe

drivers: stm32_iwdg: fix timeout configuration

Fix test on watchdog refresh command success used to program the
watchdog timeout.

Fixes: 0bdd7f5ba821 ("drivers: stm32_iwdg: implementation of independent watchdog")
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Signed-off-by: Etienne Carriere <etienne.carriere@foss.st.com>

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core: dt_driver: move related content from dt.h to dt_driver.h

Moves so-called dt_driver related declarations and definitions from
dt.h to dt_drivers.h. Incidentally adds an inline description to
en

core: dt_driver: move related content from dt.h to dt_driver.h

Moves so-called dt_driver related declarations and definitions from
dt.h to dt_drivers.h. Incidentally adds an inline description to
enum dt_driver_type. This change clarifies when a source file shall
include dt.h and/or dt_driver.h.

This change updates driver source files to include none, one or both of
these header files where applicable.

Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>

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core: replace _fdt_ prefix with fdt_ for device tree API

As per upstream discussion, there is no reason to keep _fdt_ prefix.
Replaces it with fdt_ for all occurrences.

Signed-off-by: Gatien Cheval

core: replace _fdt_ prefix with fdt_ for device tree API

As per upstream discussion, there is no reason to keep _fdt_ prefix.
Replaces it with fdt_ for all occurrences.

Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>

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drivers: stm32_iwdg: implementation of independent watchdog

Implements independent watchdog (IWDG) driver to help detecting
malfunctions due to software or hardware failures. IWDG instances
are cloc

drivers: stm32_iwdg: implementation of independent watchdog

Implements independent watchdog (IWDG) driver to help detecting
malfunctions due to software or hardware failures. IWDG instances
are clocked by an independent clock and stays active if the main
clock fails.

The driver mandates IWDG instances configuration from an embedded DTB.

For the list of features, refer to the reference manuals at:
https://wiki.st.com/stm32mpu/wiki/STM32MP15_resources

Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Lionel Debieve <lionel.debieve@foss.st.com>
Signed-off-by: Etienne Carriere <etienne.carriere@st.com>

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