Subject: [PATCHv3] ARM: socfpga: dts: Add support for SD/MMC

From: [email-masked] (Stephen Warren)
Date: Tue, 13 Aug 2013 14:10:58 -0600

On 08/13/2013 01:58 PM, Dinh Nguyen wrote:
> On Tue, 2013-08-13 at 13:52 -0600, Stephen Warren wrote:
>> On 08/12/2013 09:49 AM, dinguyen at altera.com wrote:
>>> From: Dinh Nguyen <[email-masked]>
>>>
>>> Add bindings for SD/MMC for SOCFPGA.
>>> Add "syscon" to the "altr,sys-mgr" binding.

>>> diff --git a/arch/arm/boot/dts/socfpga.dtsi b/arch/arm/boot/dts/socfpga.dtsi
>>
>>>  		sysmgr at ffd08000 {
>>> -				compatible = "altr,sys-mgr";
>>> +				compatible = "altr,sys-mgr", "syscon";
>>
>> That seems like an unrelated change?
> 
> This patch is to enable SD/MMC for SOCFPGA. The "syscon" is needed in
> dw_mmc-socfpga.c as the clock phases for the SD IP is controlled by
> registers in "altr,sys-mgr".

But nothing in the dwmmc nodes refers to the syscon node, so how can the
syscon driver possibly provide services to the MMC driver; the MMC
driver won't be able to find it. I hope there's no back-door assumption
that some syscon exists, and that there's only one of them...