linux-kernel - Re: [PATCH] GPIO: add support for NXP 74HC164 GPIO expander

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Date:	Sun, 29 Aug 2010 12:10:34 +0200
From:	Willy Tarreau <w@....eu>
To:	David Brownell <david-b@...bell.net>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Miguel Gaio <miguel.gaio@...xo.com>,
	Juhos Gabor <juhosg@...nwrt.org>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Florian Fainelli <florian@...nwrt.org>
Subject: Re: [PATCH] GPIO: add support for NXP 74HC164 GPIO expander

On Sat, Aug 28, 2010 at 04:18:51PM -0700, David Brownell wrote:
> 
> --- On Sat, 8/28/10, Florian Fainelli <florian@...nwrt.org> wrote:
> 
> > This patch adds support for
> > NXP's 74HC164 GPIO expander.
> 
> The 74164 parts are standard 74xxx series
> discrete logic parts sold by many vendors
> as 8 bit shift registers ... and in many
> logic series (HC, HCT, more).
> 
> At least describe this as generic to all
> those 8-bit shift registers, not just NXP.

Indeed, that was my concern too.

(...)
> p.s. I'd have to pull out my data sheet collection
> to verify, but it might be the 74163 which can
> be used as an 8 bit parallel to serial (input)
>  shift register...

no, it's the 74165. But it would be worth supporting
both !

Willy

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