netdev - Re: [PATCH v1 0/9] Add Nuvoton NCT6694 MFD devices

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Message-ID: <20241025-modest-hasty-angelfish-1e9193-mkl@pengutronix.de>
Date: Fri, 25 Oct 2024 10:33:34 +0200
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: Ming Yu <a0282524688@...il.com>
Cc: tmyu0@...oton.com, lee@...nel.org, linus.walleij@...aro.org, 
	brgl@...ev.pl, andi.shyti@...nel.org, 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, 
	jic23@...nel.org, lars@...afoo.de, ukleinek@...nel.org, 
	alexandre.belloni@...tlin.com, 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-iio@...r.kernel.org, 
	linux-pwm@...r.kernel.org, linux-rtc@...r.kernel.org
Subject: Re: [PATCH v1 0/9] Add Nuvoton NCT6694 MFD devices

On 25.10.2024 16:22:01, Ming Yu wrote:
> Marc Kleine-Budde <mkl@...gutronix.de> 於 2024年10月24日 週四 下午7:57寫道：
> > On 24.10.2024 16:59:13, Ming Yu wrote:
> > > This patch series introduces support for Nuvoton NCT6694, a peripheral
> > > expander based on USB interface. It models the chip as an MFD driver
> > > (1/9), GPIO driver(2/9), I2C Adapter driver(3/9), CANfd driver(4/9),
> > > WDT driver(5/9), HWMON driver(6/9), IIO driver(7/9), PWM driver(8/9),
> > > and RTC driver(9/9).
> > >
> > > The MFD driver implements USB device functionality to issue
> > > custom-define USB bulk pipe packets for NCT6694. Each child device can
> > > use the USB functions nct6694_read_msg() and nct6694_write_msg() to issue
> > > a command. They can also register a handler function that will be called
> > > when the USB device receives its interrupt pipe.
> >
> > What about implementing a proper IRQ demux handler instead?

> I think the currently planned IRQ process meets expectations.
> Is there anything that needs improvement?

You can register the IRQs of the MFD device with the Linux kernel. This
way the devices can request a threaded IRQ handler directly via the
kernel function, instead of registering the callback.

With a threaded IRQ handler you can directly call the
nct6694_read_msg(), nct6694_write_msg() without the need to start a
workqueue from the callback.

Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde          |
Embedded Linux                   | https://www.pengutronix.de |
Vertretung Nürnberg              | Phone: +49-5121-206917-129 |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-9   |

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