linux-kernel - Re: [PATCH v6 1/2] sdhci-of-arasan: Add device tree parameter xlnx-fails-without-test-cd bit

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Date:   Fri, 9 Sep 2016 08:36:12 +0200
From:   Michal Simek <michal.simek@...inx.com>
To:     Zach Brown <zach.brown@...com>, <adrian.hunter@...el.com>
CC:     <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>, <soren.brinkmann@...inx.com>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v6 1/2] sdhci-of-arasan: Add device tree parameter
 xlnx-fails-without-test-cd bit

On 8.9.2016 21:42, 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 without the CD bit.
> 
> The device property "xlnx-fails-without-test-cd" will let the arasan
> driver know the controller does not have the CD line wired and that the
> controller does not function without it.
> 
> Signed-off-by: Zach Brown <zach.brown@...com>
> ---
> v2:
>  * improved commit messages
>  * removed fake-cd device property
>  * removed fake-cd quirk
>  * use broken-cd device property
>  * documented new usage of broken-cd
> v3:
>  * removed new usage of broken-cd
>  * created fails-without-test-cd device property
>  * created arasan controller specific quirk
> v4:
>  * changed fails-without-test-cd to xlnx-fails-without-test-cd
>  * removed extra blank line
> v5:
>  * Fixed style mistake
>  * Changed (1 << 0 ) to BIT(0)
> v6:
>  * Fixed style mistakes
>  * Condensed unnecessarily long variable names
>  * Removed line wraps that were no longer necessary.
>  * Rebased changes off Ulf's mmc tree's next branch.
> 
> 
>  Documentation/devicetree/bindings/mmc/arasan,sdhci.txt | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> df --gt /Documentation/devicetree/bindings/mmc/arasan,sdhci.txt b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
> index 3404afa..e71f043 100644
> --- a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
> +++ b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
> @@ -21,6 +21,10 @@ Required Properties:
>    - interrupts: Interrupt specifier
>    - interrupt-parent: Phandle for the interrupt controller that services
>  		      interrupts for this device.
> +Optional Properties:
> +- xlnx-fails-without-test-cd: when present, the controller doesn't work when

xlnx, here.

Thanks,
Michal