linux-kernel - Re: [PATCH v7 5/7] watchdog: Add Nuvoton NCT6694 WDT support

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Message-ID: <9b451153-41b4-4c15-a586-01cb5126e207@wanadoo.fr>
Date: Fri, 7 Feb 2025 21:30:47 +0100
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: Ming Yu <a0282524688@...il.com>, tmyu0@...oton.com, lee@...nel.org,
 linus.walleij@...aro.org, brgl@...ev.pl, andi.shyti@...nel.org,
 mkl@...gutronix.de, mailhol.vincent@...adoo.fr, andrew+netdev@...n.ch,
 davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 pabeni@...hat.com, wim@...ux-watchdog.org, linux@...ck-us.net,
 jdelvare@...e.com, alexandre.belloni@...tlin.com
Cc: linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
 linux-i2c@...r.kernel.org, linux-can@...r.kernel.org,
 netdev@...r.kernel.org, linux-watchdog@...r.kernel.org,
 linux-hwmon@...r.kernel.org, linux-rtc@...r.kernel.org,
 linux-usb@...r.kernel.org
Subject: Re: [PATCH v7 5/7] watchdog: Add Nuvoton NCT6694 WDT support

Le 07/02/2025 à 08:45, Ming Yu a écrit :
> This driver supports Watchdog timer functionality for NCT6694 MFD
> device based on USB interface.

...

> +static int nct6694_wdt_probe(struct platform_device *pdev)
> +{
> +	const struct mfd_cell *cell = mfd_get_cell(pdev);
> +	struct device *dev = &pdev->dev;
> +	struct nct6694 *nct6694 = dev_get_drvdata(pdev->dev.parent);
> +	struct nct6694_wdt_data *data;
> +	struct watchdog_device *wdev;
> +
> +	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
> +	if (!data)
> +		return -ENOMEM;
> +
> +	data->msg = devm_kzalloc(dev, sizeof(union nct6694_wdt_msg),
> +				 GFP_KERNEL);
> +	if (!data->msg)
> +		return -ENOMEM;
> +
> +	data->dev = dev;
> +	data->nct6694 = nct6694;
> +	data->wdev_idx = cell->id;
> +
> +	wdev = &data->wdev;
> +	wdev->info = &nct6694_wdt_info;
> +	wdev->ops = &nct6694_wdt_ops;
> +	wdev->timeout = timeout;
> +	wdev->pretimeout = pretimeout;
> +	if (timeout < pretimeout) {
> +		dev_warn(data->dev, "pretimeout < timeout. Setting to zero\n");
> +		wdev->pretimeout = 0;
> +	}
> +
> +	wdev->min_timeout = 1;
> +	wdev->max_timeout = 255;
> +
> +	devm_mutex_init(dev, &data->lock);

Error handling?
(also apply for patch 1/7 and 6/7)

> +
> +	platform_set_drvdata(pdev, data);
> +
> +	watchdog_set_drvdata(&data->wdev, data);
> +	watchdog_set_nowayout(&data->wdev, nowayout);
> +	watchdog_stop_on_reboot(&data->wdev);
> +
> +	return devm_watchdog_register_device(dev, &data->wdev);
> +}

...

CJ