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Message-ID: <1032450702.626703.1355955227194.JavaMail.root@mail.savoirfairelinux.com> Date: Wed, 19 Dec 2012 17:13:47 -0500 (EST) From: Vivien Didelot <vivien.didelot@...oirfairelinux.com> To: Grant Likely <grant.likely@...retlab.ca> Cc: linux-kernel@...r.kernel.org, Jerome Oufella <jerome.oufella@...oirfairelinux.com>, Linus Walleij <linus.walleij@...aro.org> Subject: Re: [PATCH v2] gpio: add TS-5500 DIO blocks support Hi Grant, > Please take a look at either send me a follow-on patch to convert it > to use gpio-generic, or tell my why gpio-generic isn't appropriate here. The gpio-generic driver is not appropriate here because Technologic Systems x86-based platforms do not use a typical GPIO implementation. To name a few specificities: - The GPIOs are available through ioport and not iomem - There are input-only/output-only/input-output lines on the same block - The number of GPIOs differs between blocks (currently 11, 13 and 14 pins) - A single bit in a control register drives the direction of 4 input/output lines, while the register's other bits have different functions. IMHO these considerations justify a specific GPIO driver to support these Technologic Systems pin blocks. Regards, Vivien -- 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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