linux-kernel - Re: [PATCH v3 5/6] watchdog: rzv2h: Add support for RZ/T2H

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Message-ID: <5e36cc05-1084-4abe-b3b1-fb54ad0318da@roeck-us.net>
Date: Fri, 5 Sep 2025 08:01:48 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Prabhakar <prabhakar.csengg@...il.com>,
 Wim Van Sebroeck <wim@...ux-watchdog.org>,
 Geert Uytterhoeven <geert+renesas@...der.be>,
 Wolfram Sang <wsa+renesas@...g-engineering.com>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Philipp Zabel <p.zabel@...gutronix.de>,
 Magnus Damm <magnus.damm@...il.com>
Cc: linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
 Biju Das <biju.das.jz@...renesas.com>,
 Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
 Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH v3 5/6] watchdog: rzv2h: Add support for RZ/T2H

On 8/4/25 12:57, Prabhakar wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> 
> Add support for the RZ/T2H watchdog timer. The RZ/T2H requires control of
> the watchdog counter using the WDT Debug Control Register (WDTDCR), which
> allows explicitly stopping and starting the counter. This behavior differs
> from RZ/V2H, which doesn't have WDTDCR, so the driver is extended to handle
> this requirement.
> 
> To support this, a new `wdtdcr` flag is introduced in the `rzv2h_of_data`
> structure. When set, the driver maps the WDTDCR register and uses it to
> control the watchdog counter in the start, stop, and restart callbacks.
> Additionally, the clock divisor and count source for RZ/T2H are defined
> to match its hardware configuration.
> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> Reviewed-by: Wolfram Sang <wsa+renesas@...g-engineering.com>

Reviewed-by: Guenter Roeck <linux@...ck-us.net>