linux-kernel - Re: /sys rules Re: [RFC PATCH] fpga: Introduce new fpga subsystem

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Message-ID: <523B05E6.90605@monstr.eu>
Date:	Thu, 19 Sep 2013 16:10:46 +0200
From:	Michal Simek <monstr@...str.eu>
To:	Greg KH <greg@...ah.com>
CC:	Pavel Machek <pavel@...x.de>, Michal Simek <monstr@...str.eu>,
	Alan Tull <atull@...era.com>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Jason Cooper <jason@...edaemon.net>,
	Michal Simek <michal.simek@...inx.com>,
	linux-kernel@...r.kernel.org, Dinh Nguyen <dinguyen@...era.com>,
	Philip Balister <philip@...ister.org>,
	Alessandro Rubini <rubini@...dd.com>,
	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Cesar Eduardo Barros <cesarb@...arb.net>,
	Joe Perches <joe@...ches.com>,
	"David S. Miller" <davem@...emloft.net>,
	Stephen Warren <swarren@...dia.com>,
	Arnd Bergmann <arnd@...db.de>,
	David Brown <davidb@...eaurora.org>,
	Dom Cobley <popcornmix@...il.com>
Subject: Re: /sys rules Re: [RFC PATCH] fpga: Introduce new fpga subsystem

On 09/19/2013 04:06 PM, Greg KH wrote:
> On Thu, Sep 19, 2013 at 02:52:37PM +0200, Pavel Machek wrote:
>> On Thu 2013-09-19 13:22:00, Michal Simek wrote:
>>> On 09/19/2013 01:17 PM, Pavel Machek wrote:
>>
>>>>> Status is just there and for my zynq devcfg driver I do export some status
>>>>> bits.
>>>>>
>>>>> root@...alinux:~# cat /sys/class/fpga/fpga0/status
>>>>> partial_bitstream_status: 0
>>>>> prog_done_status: 1
>>>>> dbg_lock_status: 0
>>>>> seu_lock_status: 0
>>>>> aes_en_lock_status: 0
>>>>> aes_status: 0
>>>>> seu_status: 0
>>>>> spniden_status: 1
>>>>> spiden_status: 1
>>>>> niden_status: 1
>>>>> dbgen_status: 1
>>>>> dap_en_status: 7
>>>>
>>>> This is single file? If so, it needs to be changed. Greg is rather
>>>> clear about that.
>>>
>>> Don't you have a link to these rules? I have seen any paragraph from Greg
>>> about it but I forget where was it.
>>
>> "one value per file" and "there must be documentation in
>> Documentation/ for each file" are the rules, iirc.
>>
>> There's Documentation/sysfs-rules.txt, but it does not seem too
>> relevant.
> 
> Documentation/filesystems/sysfs.txt says it.  It probably should be
> added to sysfs-rules.txt as well, but the odds that anyone ever reads
> the documentation is so low I doubt it's even worth it.
> 
> Also, all sysfs files have to be documented in Documentation/ABI/ which
> this patch does not do :(
> 
> And yes, multiple values in a single sysfs file is not allowed at all.
> 

ok. I will read that. This is output from my fpga end driver - nothing
what I have sent for review.
Can you please look at origin patch and tell me what you think about it?

Thanks,
Michal




-- 
Michal Simek, Ing. (M.Eng), OpenPGP -> KeyID: FE3D1F91
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel - Microblaze cpu - http://www.monstr.eu/fdt/
Maintainer of Linux kernel - Xilinx Zynq ARM architecture
Microblaze U-BOOT custodian and responsible for u-boot arm zynq platform



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