Subject: Re: [PATCH 1/2] watchdog: imx2_wdg: Alow ping on suspend
To:     Alistair Francis <alistair@alistair23.me>,
        linux-kernel@vger.kernel.org, linux@roeck-us.net,
        shawnguo@kernel.org, wim@linux-watchdog.org,
        linux-watchdog@vger.kernel.org, s.hauer@pengutronix.de,
        linux-arm-kernel@lists.infradead.org
Cc:     linux-imx@nxp.com, kernel@pengutronix.de, festevam@gmail.com,
        devicetree@vger.kernel.org, robh+dt@kernel.org
References: <20220109114120.386013-1-alistair@alistair23.me>
 <20220109114120.386013-2-alistair@alistair23.me>
From:   Stefan Wahren <stefan.wahren@i2se.com>
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Message-ID: <4c5df296-b930-f65f-1106-c00889f1cdc1@i2se.com>
Date:   Thu, 13 Jan 2022 19:55:58 +0100
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Precedence: bulk

Hi,

Am 09.01.22 um 12:41 schrieb Alistair Francis:
> The i.MX watchdog cannot be disabled by softwrae once it has been
s/softwrae/software/
> enabled. This means that it can't be stopped before suspend.
>
> For systems that enter low power mode this is fine, as the watchdog will
> be automatically stopped by hardwrae in low power mode. Not all i.MX
s/hardwrae/hardware/
> platforms support low power mode in the mainline kernel. For example the
> i.MX7D does not enter low power mode and so will be rebooted 2 minutes
> after entering freeze or mem sleep states.
>
> This patch introduces a device tree property "fsl,ping-during-suspend"
> that can be used to enable ping on suspend support for these systems.

Introducing vendor specific properties for Linux behavior should be
avoided. The DT should describe just the hardware.

In case i.mx7d is affected, how about enabling this workaround for
compatible fsl,imx7d-wdt? This has the advantage that in case low power
mode will be implemented
<https://elixir.bootlin.com/linux/latest/B/ident/fsl%2Cimx7d-wdt>, we
don't have to care about DTB files.

Best regards

>
> Signed-off-by: Alistair Francis <alistair@alistair23.me>
> ---
>  .../bindings/watchdog/fsl-imx-wdt.yaml        |  7 ++++++
>  drivers/watchdog/imx2_wdt.c                   | 22 +++++++++++++------
>  2 files changed, 22 insertions(+), 7 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/watchdog/fsl-imx-wdt.yaml b/Documentation/devicetree/bindings/watchdog/fsl-imx-wdt.yaml
> index fb7695515be1..b8660a3c456c 100644
> --- a/Documentation/devicetree/bindings/watchdog/fsl-imx-wdt.yaml
> +++ b/Documentation/devicetree/bindings/watchdog/fsl-imx-wdt.yaml
> @@ -55,6 +55,13 @@ properties:
>        If present, the watchdog device is configured to assert its
>        external reset (WDOG_B) instead of issuing a software reset.
>  
> +  fsl,ping-during-suspend:
> +    $ref: /schemas/types.yaml#/definitions/flag
> +    description: |
> +      If present, the kernel will ping the watchdog during suspend.
> +      This should be used on platforms that don't enter low power mode
> +      during suspend.
> +
>  required:
>    - compatible
>    - interrupts
> diff --git a/drivers/watchdog/imx2_wdt.c b/drivers/watchdog/imx2_wdt.c
> index 51bfb796898b..9a5fdb3173a8 100644
> --- a/drivers/watchdog/imx2_wdt.c
> +++ b/drivers/watchdog/imx2_wdt.c
> @@ -66,6 +66,7 @@ struct imx2_wdt_device {
>  	struct watchdog_device wdog;
>  	bool ext_reset;
>  	bool clk_is_on;
> +	bool no_ping;
>  };
>  
>  static bool nowayout = WATCHDOG_NOWAYOUT;
> @@ -312,12 +313,14 @@ static int __init imx2_wdt_probe(struct platform_device *pdev)
>  
>  	wdev->ext_reset = of_property_read_bool(dev->of_node,
>  						"fsl,ext-reset-output");
> +	wdev->no_ping = !of_property_read_bool(dev->of_node, "fsl,ping-during-suspend");
>  	platform_set_drvdata(pdev, wdog);
>  	watchdog_set_drvdata(wdog, wdev);
>  	watchdog_set_nowayout(wdog, nowayout);
>  	watchdog_set_restart_priority(wdog, 128);
>  	watchdog_init_timeout(wdog, timeout, dev);
> -	watchdog_stop_ping_on_suspend(wdog);
> +	if (wdev->no_ping)
> +		watchdog_stop_ping_on_suspend(wdog);
>  
>  	if (imx2_wdt_is_running(wdev)) {
>  		imx2_wdt_set_timeout(wdog, wdog->timeout);
> @@ -366,9 +369,11 @@ static int __maybe_unused imx2_wdt_suspend(struct device *dev)
>  		imx2_wdt_ping(wdog);
>  	}
>  
> -	clk_disable_unprepare(wdev->clk);
> +	if (wdev->no_ping) {
> +		clk_disable_unprepare(wdev->clk);
>  
> -	wdev->clk_is_on = false;
> +		wdev->clk_is_on = false;
> +	}
>  
>  	return 0;
>  }
> @@ -380,11 +385,14 @@ static int __maybe_unused imx2_wdt_resume(struct device *dev)
>  	struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
>  	int ret;
>  
> -	ret = clk_prepare_enable(wdev->clk);
> -	if (ret)
> -		return ret;
> +	if (wdev->no_ping) {
> +		ret = clk_prepare_enable(wdev->clk);
>  
> -	wdev->clk_is_on = true;
> +		if (ret)
> +			return ret;
> +
> +		wdev->clk_is_on = true;
> +	}
>  
>  	if (watchdog_active(wdog) && !imx2_wdt_is_running(wdev)) {
>  		/*