linux-kernel - Re: [PATCH v2 2/2] devicetree: Add devicetree bindings documentation for Cadence SPI

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

Date:	Fri, 4 Apr 2014 20:19:37 +0530
From:	Harini Katakam <harinikatakamlinux@...il.com>
To:	Mark Brown <broonie@...nel.org>
Cc:	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>, linux-spi@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] devicetree: Add devicetree bindings documentation
 for Cadence SPI

Hi Mark,

On Fri, Apr 4, 2014 at 8:12 PM, Mark Brown <broonie@...nel.org> wrote:
> On Fri, Apr 04, 2014 at 07:38:14PM +0530, Harini Katakam wrote:
>
>> OK. I understand.
>> Can you comment on the case where a decoder is used?
>
>> There is support for adding a decoder where extended slaves can be selected
>> through the IP's control register.
>> (This is not currently implemented in the driver but will be in the future.)
>
>> How should the driver know whether it is 4 or 16 select lines for example?
>> This has to be written to master->num_chipselect.
>
> That's the sort of case where it's useful yes - depending on how the
> implementation is done it may be sensible to just have a property
> specifying if a decoder is there (if it just changes the encoding in the
> register for example).

OK, great. That approach will work.

Regards,
Harini
--
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/