linux-kernel - Re: [PATCH 1/2] sdhci-of-arasan: Add quirk and device tree parameter to fake CD bit

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Message-ID: <20160825151047.GO16583@xsjsorenbubuntu>
Date:   Thu, 25 Aug 2016 08:10:47 -0700
From:   Sören Brinkmann <soren.brinkmann@...inx.com>
To:     Zach Brown <zach.brown@...com>
CC:     <adrian.hunter@...el.com>, <robh+dt@...nel.org>,
        <ulf.hansson@...aro.org>, <mark.rutland@....com>,
        <linux-mmc@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <michal.simek@...inx.com>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/2] sdhci-of-arasan: Add quirk and device tree parameter
 to fake CD bit

On Wed, 2016-08-24 at 18:23:03 -0500, Zach Brown wrote:
> The sdhci controller on xilinx zynq devices will not function unless
> the cd bit is provided. http://www.xilinx.com/support/answers/61064.html
> In cases where it is impossible to provide the cd bit in hardware,
> setting the controller to test mode and then setting inserted to true
> will get the controller to function with out the cd bit.
> 
> The device property "fake-cd" will let the arasan driver know it needs
> to fake the cd bit for the controller inorder for the controller to
> function with a SD card that does not provide the CD bit.

I thought the CD is, if not pinned out, tied off to some valid logic
level. Isn't it enough to specify cd-inverted if needed to make it work
in those cases?

	Sören