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drivers: serial: nrfx_uarte: Add requesting of HSFLL GD clock when fast UARTE (uart120) is used #82103

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drivers: serial: nrfx_uarte: Add requesting of HSFLL GD clock when fast UARTE (uart120) is used #82103

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Commits on Dec 3, 2024

  1. drivers: serial: nrfx_uarte: Add support for non ISR PM mode 

    When fast UARTE instance is used (e.g. UARTE120 in nrf54h20), PM actions
are not ISR safe because they include communication over IPC so they can
only be called from the thread context. Extend driver to support both
PM modes. When non ISR mode is used then uart_rx_enable() and uart_tx()
will return error if they are called from ISR and resume operation
would need to be called because device is suspended. On completion,
driver is calling pm_device_runtime_put_async which can be called from
the ISR context.

Additionally, suspending in the TXSTOPPED and RXTO events has been
moved after user callback. It allows to support the case where
uart_rx_enable() or uart_tx() are called from that callback context.
Since suspending is called after returning from the callback it will
not trigger suspend action because API called in the callback context
will increment the usage counter (when pm_device_runtime_get() is
called).

Signed-off-by: Krzysztof Chruściński <[email protected]>
    @nordic-krch
    nordic-krch committed Dec 3, 2024
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  2. drivers: serial: nrfx_uarte: Request hsfll clock for fast instance 

    Request fast global domain to run at 320 MHz during fast UARTE
activity. As request is asynchronous it cannot be called from
an ISR. Due to complexity to handle that without device runtime
power management a requirement is added so that if fast UARTE
is used device runtime PM must be enabled. Clock is request
and released in PM resume and suspended actions which in case
of fast UARTE are only called from thread context.

Signed-off-by: Krzysztof Chruściński <[email protected]>
    @nordic-krch
    nordic-krch committed Dec 3, 2024
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  3. tests: drivers: uart: async_api: nrf54h20dk: Enable device PM 

    Enable device runtime PM for nrf54h20dk/nrf54h20/cpuapp where
fast UARTE (uart120) is tested.

Signed-off-by: Krzysztof Chruściński <[email protected]>
    @nordic-krch
    nordic-krch committed Dec 3, 2024
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