linux-kernel - Re: [PATCH] misc: add driver for Renesas R-Car Gyro-ADC/speed-pulse interfaces

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Message-ID: <51E0AA24.6070203@cogentembedded.com>
Date:	Sat, 13 Jul 2013 05:15:16 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Greg KH <gregkh@...uxfoundation.org>
CC:	arnd@...db.de, linux-kernel@...r.kernel.org,
	linux-sh@...r.kernel.org
Subject: Re: [PATCH] misc: add driver for Renesas R-Car Gyro-ADC/speed-pulse
 interfaces

Hello.

    Can't get to sleep, sigh...

On 07/13/2013 04:57 AM, Greg KH wrote:

>> Add the driver for Gyro-ADC/speed-pulse interfaces found in Renesas R-Car SoCs.
>> Though  being two separate devices, they have to be driven together because of
>> the shared start/stop register (located in Gyro-ADC still). At this time, only
>> speed-pulse interface is fully supported, the Gyro-ADC is just initialized and
>> started/stopped synchronously with the speed-pulse interface.  A user interface
>> is implemented via several sysfs files which allow to read and reset the speed-
>> pulse interface's registers.

> If you modify/create/remove sysfs files, you also have to document them
> in Documentation/ABI/ which is missing from this patch.

    I've looked there and didn't find the documentation for my closest
model driver, drivers/misc/ti_dac7512.c (or for many other drivers), so 
I thought I too can do without it.

> Your sysfs files are also being created in a "racy" way, i.e. after
> userspace is told about the device, please fix that as well.

    Not sure I understand you. Could you elaborate?

> And are you sure you want to control this through sysfs?  There's no
> other better user/kernel apis for it?

    I found none, besides ioctl(), as the device driven is rather 
unique. But I thought that sysfs is "ioctl() today", so I went with it...

> thanks,

> greg k-h

WBR, Sergei

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