linux-kernel - Re: [PATCH 2/2] Watchdog: Add octeontx2 GTI watchdog driver

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Message-ID: <20230418210547.GA2322152-robh@kernel.org>
Date:   Tue, 18 Apr 2023 16:05:47 -0500
From:   Rob Herring <robh@...nel.org>
To:     Bharat Bhushan <bbhushan2@...vell.com>
Cc:     wim@...ux-watchdog.org, linux@...ck-us.net,
        krzysztof.kozlowski+dt@...aro.org, linux-watchdog@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] Watchdog: Add octeontx2 GTI watchdog driver

On Fri, Apr 14, 2023 at 03:53:42PM +0530, Bharat Bhushan wrote:
> GTI watchdog timer are programmed in "interrupt + del3t + reset mode"
> and del3t traps are not enabled.
> GTI watchdog exception flow is:
>  - 1st timer expiration generates watchdog interrupt.
>  - 2nd timer expiration is ignored
>  - On 3rd timer expiration will trigger a system-wide core reset.
> 
> Signed-off-by: Bharat Bhushan <bbhushan2@...vell.com>
> ---
>  drivers/watchdog/Kconfig         |   9 ++
>  drivers/watchdog/Makefile        |   1 +
>  drivers/watchdog/octeontx2_wdt.c | 238 +++++++++++++++++++++++++++++++
>  3 files changed, 248 insertions(+)
>  create mode 100644 drivers/watchdog/octeontx2_wdt.c
> 
> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> index f0872970daf9..31ff282c62ad 100644
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -2212,4 +2212,13 @@ config KEEMBAY_WATCHDOG
>  	  To compile this driver as a module, choose M here: the
>  	  module will be called keembay_wdt.
>  
> +config OCTEONTX2_WATCHDOG
> +	tristate "OCTEONTX2 Watchdog driver"
> +	depends on ARCH_THUNDER || (COMPILE_TEST && 64BIT)
> +	help
> +	 OCTEONTX2 GTI hardware supports watchdog timer. This watchdog timer are
> +	 programmed in "interrupt + del3t + reset" mode. On first expiry it will
> +	 generate interrupt. Second expiry (del3t) is ignored and system will reset
> +	 on final timer expiry.
> +
>  endif # WATCHDOG
> diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
> index 9cbf6580f16c..aa1b813ad1f9 100644
> --- a/drivers/watchdog/Makefile
> +++ b/drivers/watchdog/Makefile
> @@ -230,3 +230,4 @@ obj-$(CONFIG_MENZ069_WATCHDOG) += menz69_wdt.o
>  obj-$(CONFIG_RAVE_SP_WATCHDOG) += rave-sp-wdt.o
>  obj-$(CONFIG_STPMIC1_WATCHDOG) += stpmic1_wdt.o
>  obj-$(CONFIG_SL28CPLD_WATCHDOG) += sl28cpld_wdt.o
> +obj-$(CONFIG_OCTEONTX2_WATCHDOG) += octeontx2_wdt.o
> diff --git a/drivers/watchdog/octeontx2_wdt.c b/drivers/watchdog/octeontx2_wdt.c
> new file mode 100644
> index 000000000000..7b78a092e83f
> --- /dev/null
> +++ b/drivers/watchdog/octeontx2_wdt.c
> @@ -0,0 +1,238 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* Marvell Octeontx2 Watchdog driver
> + *
> + * Copyright (C) 2023 Marvell International Ltd.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/cpu.h>
> +#include <linux/interrupt.h>
> +#include <linux/of_platform.h>

It's doubtful you need anything from of_platform.h other than implicit 
includes. Use the header(s) you need directly.

Rob