2011/4/28 Barry Song <21cnbao@xxxxxxxxx>: > Hi Philip, > > 2011/4/26 Philip Rakity <prakity@xxxxxxxxxxx>: >> >> Barry, >> >> How are interrupts from SDIO devices handled ?  SDIO devices use one of the pins to signal a interrupt to the host when data is availabe. > > Good question. in fact, it is impossible to support both sharing all > data bus and sdio interrupt in hardware except that hardware gives a > special design with data1. Otherwise, controllers with shared pins > requested at runtime will not support sdio devices with interrupts. So the point is that leaving get/put_shared_pins implementation to bottom level drivers. Let the bottom level handle possible details. > >> >> Philip >> >> On Apr 26, 2011, at 12:27 AM, Barry Song wrote: >> >>> Hi Wolfram, >>> >>> 2011/4/26 Wolfram Sang <w.sang@xxxxxxxxxxxxxx>: >>>>>> * Where is the patch that implements the get_shared_pins() hook in >>>>>> Âyour driver? >>>>> We send the common level patch ahead to get the upstream agreement so >>>>> that we can maintain our bottom level sdhci codes better. We will send >>>>> the special driver patch after some time. >>>> >>>> Hmm, why should be there a functionality if there is no user for it? A >>>> reference user helps people understand how it is intended to be used. >>> >>> completely right. Of course this patch is based on real applications >>> and SoCs. We are using ARASAN sd controller IP, it can be configurated >>> to use shared pins mode in SoC design. And it looks like it is a >>> common requirement to save chip footprint by sharing data bus between >>> multi-controllers. >>> >>> Just because Our SoCs are still on the way to opensource and mainline. >>> Even our arch/arm/mach-xxx hasn't been merged yet. Our target is >>> syncing our codes with mainline. So as a modification to sdhci common >>> level, we just get upstream's opinion for local maintaining earlier. >>> >>> Anyway, this patch may be applied later after our others are ready. Or >>> it can be now so that other SoC companies can use this feature. >>> >>>> >>>> Regards, >>>> >>>>  Wolfram >>>> >>>> -- >>>> Pengutronix e.K.              | Wolfram Sang        Â| >>>> Industrial Linux Solutions         | http://www.pengutronix.de/ Â| >>>> >> >> > -barry > -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
