linux-kernel - Re: [PATCHv4 1/1] [RFC] uartclk from serial

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Date:	Wed, 5 Sep 2012 13:36:41 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Tomas Hlavacek <tmshlvck@...il.com>
Cc:	alan@...ux.intel.com, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org, marek.vasut@...il.com
Subject: Re: [PATCHv4 1/1] [RFC] uartclk from serial_core exposed to sysfs

On Sun, Aug 19, 2012 at 08:34:45PM +0200, Tomas Hlavacek wrote:
> Added file /sys/devices/.../tty/ttySX/uartclk to allow reading
> uartclk value in struct uart_port in serial_core via sysfs.
> 
> It simplifies initialization verification of no-name cards that
> have non-standard oscillator speed while having no distinguishing
> PCI IDs to allow autodetection.
> 
> tty_register_device() has been generalized and refactored in order
> to add support for setting drvdata and attribute_group to the device.
> 
> Signed-off-by: Tomas Hlavacek <tmshlvck@...il.com>

This looks good, but it doesn't apply to my tty-next branch in
linux-next, so I can't apply it.

But, when you redo it, here's one tiny thing to change:

> +/**
> + *	tty_register_device_attr - register a tty device
> + *	@driver: the tty driver that describes the tty device
> + *	@index: the index in the tty driver for this tty device
> + *	@device: a struct device that is associated with this tty device.
> + *		This field is optional, if there is no known struct device
> + *		for this tty device it can be set to NULL safely.
> + *	@drvdata: Driver data to be set to device (NULL = do not touch).
> + *	@attr_grp: Attribute group to be set on device (NULL = do not touch).

No need to mention the NULL thing here, "do not touch" doesn't mean
much to me.

> +	if (attr_grp)
> +		dev->groups = attr_grp;
> +	if (drvdata)
> +		dev_set_drvdata(dev, drvdata);

No need to test for NULL, just set them, it can't really hurt, right?

thanks,

greg k-h
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