> -----Original Message----- > From: Ohad Ben-Cohen [mailto:o...@wizery.com] > Sent: Tuesday, July 06, 2010 6:48 AM > To: Nicolas Pitre > Cc: linux-wirel...@vger.kernel.org; linux-...@vger.kernel.org; linux- > o...@vger.kernel.org; linux-arm-ker...@lists.infradead.org; > li...@arm.linux.org.uk; Chikkature Rajashekar Madhusudhan; Luciano Coelho; > Andrew Morton; San Mehat; Pandita, Vikram > Subject: Re: [PATCH 05/15] omap: hsmmc: add virtual card detect support > > On Tue, Jul 6, 2010 at 1:22 PM, Ohad Ben-Cohen <o...@wizery.com> wrote: > > Note: the wl1271 device does support standard card detection, but > > AFAIK there's a limitation to use that with the specific omap > > controller the device is hardwired to. I will try to get more info > > about that, but probably Madhu can comment on that better. > > > Some correction and additional info: > > The wl1271 device has an issue which makes the standard card detect > mechanism irrelevant: it is always up, even if the power enable gpio > input of the device is down (the power enable input does not supply > the power to the chip, it's just logical digital high/low input upon > which the device reacts). That's why we must use software control for > emulating card detect with that device. > > In addition, as far as I could find out, the card detect mechanism on > the ZOOM is implemented by mechanical means, and thus is not relevant > for hardwired embedded SDIO devices (I'm not even sure card detect is > supported for the 3rd mmc controller).
The card detect is supported through T2 GPIO interrupts only for MMC1 and MMC2. Such a mechanism is not present for MMC3 to which the WLAN chip is hardwired. Regards, Madhu -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
