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Date: Sat, 28 Aug 2010 16:18:51 -0700 (PDT) From: David Brownell <david-b@...bell.net> To: 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, 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. And not as "GPIO expanders"; data sheets describe them as shift registers. Kconfig can say that the shift registers are being used for GPIO (output) expansion. I suppose it's reasonable not to support the way these chips can be daisy-chained, but it'd be worth a comment, IMO; that strikes me as a think someone will add at some point, via some platform data (e.g.32 GPIO outputs from 4 chips). - Dave 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... -- 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/
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