Re: [PATCH v3 1/3] dt-bindings: watchdog: sunxi: Add compatibles for R329

Maxime Ripard
2021-09-03T09:30:15Z

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On Thu, Sep 02, 2021 at 05:57:48PM -0500, Samuel Holland wrote:
> On existing SoCs, the watchdog has a single clock input: HOSC (OSC24M)
> divided by 750. However, starting with R329, LOSC (OSC32k) is added as
> an alternative clock source, with a bit to switch between them.
>
> Since 24 MHz / 750 == 32 kHz, not 32.768 kHz, the hardware adjusts the
> cycle counts to keep the timeouts independent of the clock source. This
> keeps the programming interface backward-compatible.
>
> Furthermore, the R329 has two watchdogs: one for use by the ARM CPUs
> at 0x20000a0, and a second one for use by the DSPs at 0x7020400. The
> first of these adds two more new registers, to allow software to
> immediately assert the SoC reset signal. Add an additional "-reset"
> suffix to signify the presence of this feature.
>
> Signed-off-by: Samuel Holland <samuel@sholland.org>

Acked-by: Maxime Ripard <maxime@cerno.tech>

Thanks!
Maxime

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