linux-kernel - Re: [PATCH 2/2] ARM: dts: MSM8974: Add pinctrl node

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]

Message-ID: <1396964805.28420.53.camel@iivanov-dev>
Date:	Tue, 08 Apr 2014 16:46:45 +0300
From:	"Ivan T. Ivanov" <iivanov@...sol.com>
To:	Timur Tabi <timur@...eaurora.org>
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	devicetree@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>,
	linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 2/2] ARM: dts: MSM8974: Add pinctrl node

On Tue, 2014-04-08 at 07:33 -0500, Timur Tabi wrote:
> Ivan T. Ivanov wrote:
> >> >I'm confused by this.  Isn't this information already defined in the
> >> >pinctrl-msm8x74.c driver?
> >> >
> >> >static const char * const blsp_spi8_groups[] = {
> >> >     "gpio45", "gpio46", "gpio47", "gpio48"
> >> >};
> > I am not sure that I understand the question. This is one of
> > possible ways to describe relationship between pins and functions.
> > As they are described is visible what is their real purpose.
> 
> Ok, let me rephrase.
> 
> The 8x74 pinctrl driver already contains this information.  It already 
> defines a "blsp_spi8" group consisting of GPIOs 45, 46, 47, and 48.
> 
> This patch adds that same exact information into the device tree.  Why 
> are we duplicating that information?  Why add it to the device tree when 
> it's already in the driver (and already working).

Probably. It was my natural way of thinking. Pin have a functions. 
It is easier if I measure signals to just look at the device
tree file. What are you suggesting?

> 
> Also, I don't see any code anywhere that uses these new device tree nodes.

This is easy to fix :-).

Regards,
Ivan

--
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/