linux-kernel - Re: [PATCH 1/9] mfd: Add driver for Photonicat power management MCU

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Message-ID: <d79dbfae-d50b-45e5-b430-be8106bbb03c@web.de>
Date: Sat, 7 Sep 2024 10:10:07 +0200
From: Markus Elfring <Markus.Elfring@....de>
To: Junhao Xie <bigfoot@...ssfun.cn>, devicetree@...r.kernel.org,
 linux-hwmon@...r.kernel.org, linux-leds@...r.kernel.org,
 linux-pm@...r.kernel.org, linux-rtc@...r.kernel.org,
 linux-watchdog@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-rockchip@...ts.infradead.org
Cc: LKML <linux-kernel@...r.kernel.org>,
 Alexandre Belloni <alexandre.belloni@...tlin.com>,
 Chukun Pan <amadeus@....edu.cn>, Conor Dooley <conor+dt@...nel.org>,
 Günter Röck <linux@...ck-us.net>,
 Heiko Stübner <heiko@...ech.de>,
 Jean Delvare <jdelvare@...e.com>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Lee Jones <lee@...nel.org>, Pavel Machek <pavel@....cz>,
 Rob Herring <robh@...nel.org>, Sebastian Reichel <sre@...nel.org>,
 Wim Van Sebroeck <wim@...ux-watchdog.org>
Subject: Re: [PATCH 1/9] mfd: Add driver for Photonicat power management MCU

…
> +++ b/drivers/mfd/photonicat-pmu.c
> @@ -0,0 +1,501 @@
…
> +int pcat_pmu_execute(struct pcat_request *request)
> +{
…

Under which circumstances would you become interested to apply statements
like the following?


> +	mutex_lock(&pmu->reply_lock);
> +	if (request->frame_id == 0)
> +		request->frame_id = atomic_inc_return(&pmu->frame);
> +	pmu->reply = request;
> +	mutex_unlock(&pmu->reply_lock);
…

A) guard(mutex)(&pmu->reply_lock);
   https://elixir.bootlin.com/linux/v6.11-rc6/source/include/linux/mutex.h#L196



> +		spin_lock_irqsave(&pmu->bus_lock, flags);
> +		ret = pcat_pmu_raw_write(pmu, request->frame_id, req->cmd,
> +					 true, req->data, req->size);
> +		spin_unlock_irqrestore(&pmu->bus_lock, flags);
…

B) guard(spinlock_irqsave)(&pmu->bus_lock);
   https://elixir.bootlin.com/linux/v6.11-rc6/source/include/linux/spinlock.h#L572


Regards,
Markus