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

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Date:   Fri, 3 Sep 2021 11:07:46 -0500
From:   Rob Herring <robh@...nel.org>
To:     Samuel Holland <samuel@...lland.org>
Cc:     linux-kernel@...r.kernel.org, linux-sunxi@...ts.linux.dev,
        Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Icenowy Zheng <icenowy@...c.io>,
        linux-watchdog@...r.kernel.org, Maxime Ripard <mripard@...nel.org>,
        devicetree@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 1/3] dt-bindings: watchdog: sunxi: Add compatibles for
 R329

On Thu, 02 Sep 2021 17:57:48 -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@...lland.org>
> ---
> Changes v2 to v3:
>  - Add else case
>  - Add additional allwinner,sun50i-r329-wdt-reset compatible
> Changes v1 to v2:
>  - Switch clock-names from enum to const
>  - Add descriptions to "clocks" items
> 
>  .../watchdog/allwinner,sun4i-a10-wdt.yaml     | 42 ++++++++++++++++++-
>  1 file changed, 41 insertions(+), 1 deletion(-)
> 

Reviewed-by: Rob Herring <robh@...nel.org>