linux-kernel - Re: [PATCH] uio/pdrv

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 31 Mar 2011 15:23:28 +0200
From:	Wolfram Sang <w.sang@...gutronix.de>
To:	John Williams <john.williams@...alogix.com>
Cc:	Michal Simek <monstr@...str.eu>,
	devicetree-discuss@...ts.ozlabs.org, grant.likely@...retlab.ca,
	linux-kernel@...r.kernel.org, hjk@...utronix.de, gregkh@...e.de
Subject: Re: [PATCH] uio/pdrv_genirq: Add OF support


>    Maybe I misunderstand you, in my view it is the responsibility of <vendor>
>    to create their DTS files to indicate they want <special-card1> to bind to
>    generic-uio.

Device tree is a OS-neutral hardware description language. "generic-uio"
is neither OS-neutral nor a hardware description. devicetree.org has
more information about this.

>    Our use-case is pretty clear, in FPGA-based systems it is common to create
>    arbitrary devices that developers just want to control from userspace,
>    with simple IRQ and IO capabilities (DMA can come later :). �They don't
>    need to bind to other kernel APIs or subsystems, and don't want to invest
>    in one-off kernel drivers that simply will never go upstream.

For that, the new_compatible-file would be suitable, I think.

>    UIO is perfect, and simply tagging the device as generic-uio in the DTS is
>    so simple, clean, and elegant.

Simple, yes (I do understand I wrote the first approach ;)) . Elegant,
not really, because it breaks core conventions of the device tree. For
your case it is a very conveniant hack, but it is still a hack.

Regards,

   Wolfram

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

Download attachment "signature.asc" of type "application/pgp-signature" (199 bytes)