linux-kernel - Re: [PATCH v2] mmc: dw_mmc: add support for the other bit of sdio interrupt

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Message-ID: <CAD=FV=Wmb0ZhB1WmK9SPg28LWB3zv9oNj0peTx3Ybt_KMSv7bw@mail.gmail.com>
Date:	Fri, 31 Oct 2014 08:55:12 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Jaehoon Chung <jh80.chung@...sung.com>
Cc:	Addy Ke <addy.ke@...k-chips.com>, Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Seungwon Jeon <tgih.jun@...sung.com>,
	Chris Ball <chris@...ntf.net>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Dinh Nguyen <dinguyen@...era.com>,
	Heiko Stübner <heiko@...ech.de>,
	Olof Johansson <olof@...om.net>,
	Sonny Rao <sonnyrao@...omium.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
	"zhenfu.fang" <zhenfu.fang@...k-chips.com>,
	Eddie Cai <cf@...k-chips.com>, lintao <lintao@...k-chips.com>,
	chenfen <chenfen@...k-chips.com>, zyf <zyf@...k-chips.com>,
	Jianqun Xu <xjq@...k-chips.com>,
	Tao Huang <huangtao@...k-chips.com>,
	Chris <zyw@...k-chips.com>,
	姚智情 <yzq@...k-chips.com>,
	han jiang <hj@...k-chips.com>,
	Kever Yang <kever.yang@...k-chips.com>,
	zhangqing <zhangqing@...k-chips.com>,
	Lin Huang <hl@...k-chips.com>
Subject: Re: [PATCH v2] mmc: dw_mmc: add support for the other bit of sdio interrupt

Jaehoon,

On Fri, Oct 31, 2014 at 1:45 AM, Jaehoon Chung <jh80.chung@...sung.com> wrote:
> Hi, Addy.
>
> On 10/31/2014 12:50 PM, Addy Ke wrote:
>> The bit of sdio interrupt is 16 in designware implementation,
>> but it is 24 in RK3288. This patch add sdio_id0 for the number
>> of slot0 in the SDIO interrupt registers, which can be set in
>> platform DT table, such as:
>> - rockchip,sdio-interrupt-slot0 = <8>;
>
> I have a question. (It's not important question)
> You mentioned the sdio-irq bit used from 24 to 31, right?
> Then what interrupts are used from 16 to 23 at RK3288? Just reserved?

In my TRM 16 shows as "data_nobusy".  A quick search doesn't show any
documentation for what this means.  17-23 and 25-31 are reserved.

Note that (of course) there's no actual support for more than one slot
on rk3288, so claiming that "24-31" is SDIO INT is a little silly, but
I agree that it's probably is the best way to fit into the existing
code until someone gets around to removing the whole multi-slot cruft.
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