linux-kernel - Re: [PATCH v8 2/2] rtc: sophgo: add rtc support for Sophgo CV1800 SoC

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Message-ID: <202404172121325952016a@mail.local>
Date: Wed, 17 Apr 2024 23:23:00 +0200
From: Alexandre Belloni <alexandre.belloni@...tlin.com>
To: Jingbao Qiu <qiujingbao.dlmu@...il.com>
Cc: robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
	conor+dt@...nel.org, paul.walmsley@...ive.com, palmer@...belt.com,
	aou@...s.berkeley.edu, linux-rtc@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	dlan@...too.org, inochiama@...look.com
Subject: Re: [PATCH v8 2/2] rtc: sophgo: add rtc support for Sophgo CV1800 SoC

Hello,

On 04/02/2024 12:41:43+0800, Jingbao Qiu wrote:
> +#define REG_ENABLE_FUN         BIT(0)
> +#define REG_DISABLE_FUN        0x00UL

I don't feel like these two macros make your code clearer, you should
probably simply use 0 and 1 in the proper locations.

> +static irqreturn_t cv1800_rtc_irq_handler(int irq, void *dev_id)
> +{
> +	struct rtc_device *rtc = dev_id;
> +
> +	rtc_update_irq(rtc, 1, RTC_IRQF | RTC_AF);

I'm pretty sure this would result in a crash...

> +
> +	return IRQ_HANDLED;
> +}
> +
> +	ret = devm_request_irq(&pdev->dev, rtc->irq, cv1800_rtc_irq_handler,
> +			       IRQF_TRIGGER_HIGH, "alarm", &pdev->dev);

.. you probably want to use rtc->rtc_dev here to fix this.

This also means that you have to request the irq late, else you are open
t a race condition anyway.

> +	if (ret)
> +		return dev_err_probe(&pdev->dev, ret,
> +				     "cannot register interrupt handler\n");
> +

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com