linux-kernel - AT91: SPI: On implementing peripheral chip select decoding

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>] [day] [month] [year] [list]

Date:	Fri, 13 May 2011 17:37:39 +0100
From:	Christian Gagneraud <chris@...hworks.ie>
To:	linux-kernel@...r.kernel.org
Subject: AT91: SPI: On implementing peripheral chip select decoding

Hi there,

The AT91SAM9G20 SPI controller (and possibly other SAM9 or other SoC) 
has the ability to work with CS decoding, thus allowing up to 15 
peripherals with only 4 CS lines (CS[0:3]=0xF meaning no peripheral 
selected).
I would like to know if anyone has experimented with this feature, or if 
anyone has advices/ideas on how to add support for this feature in the 
linux kernel.

Before starting to work on this, I would like to know if this feature is 
common on other platforms or if it's AT91 specific.
In the former case, it might be wise to include it in the SPI subsystem, 
and in the latter case keep it inside AT91 code.

Chris

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/