Re: [PATCH] mmc:sdhci:add support to request/free pins for controllers sharing hardware bus

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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.

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
>>>>  your 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                |
>> Industrial Linux Solutions                 | http://www.pengutronix.de/  |
>> 

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