linux-kernel - Re: [PATCH v5 05/12] dt: bindings: Add bindings for Marvell Xenon SD Host Controller

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Date:   Fri, 27 Jan 2017 18:25:56 +0100
From:   Gregory CLEMENT <gregory.clement@...e-electrons.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        "linux-mmc\@vger.kernel.org" <linux-mmc@...r.kernel.org>,
        Jason Cooper <jason@...edaemon.net>,
        Andrew Lunn <andrew@...n.ch>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        "linux-arm-kernel\@lists.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Mike Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        "devicetree\@vger.kernel.org" <devicetree@...r.kernel.org>,
        Ziji Hu <huziji@...vell.com>, Jimmy Xu <zmxu@...vell.com>,
        Jisheng Zhang <jszhang@...vell.com>,
        Nadav Haklai <nadavh@...vell.com>, Ryan Gao <ygao@...vell.com>,
        Doug Jones <dougj@...vell.com>, Victor Gu <xigu@...vell.com>,
        "Wei\(SOCP\) Liu" <liuw@...vell.com>,
        Wilson Ding <dingwei@...vell.com>,
        Yehuda Yitschak <yehuday@...vell.com>,
        Ma rcin Wojtas <mw@...ihalf.com>,
        Hanna Hawa <hannah@...vell.com>,
        Kostya Porotchkin <kostap@...vell.com>
Subject: Re: [PATCH v5 05/12] dt: bindings: Add bindings for Marvell Xenon SD Host Controller

Hi Ulf,
 
 On ven., janv. 27 2017, Ulf Hansson <ulf.hansson@...aro.org> wrote:

>>
>> But I am curious to know why do you think we could use it without any
>> need. Are you aware of some abuse of this property?
>
> Yes.
>

Actually I was hopping that you point some examples :)

But as you point mmc-ddr-3_3v I found my answers here:
http://www.spinics.net/lists/linux-mmc/msg38602.html

>>
>>>
>>> Perhaps you can elaborate exactly why it makes sense for your case. Or
>>> perhaps we already discussed this, in either case, please re-fresh my
>>> mind.
>>
>> For instance we need it now on the 7040DB board which does not have the
>> 1.8V signal voltage available.
>
> It it's better to describe what the controller/board support, instead
> of what it doesn't.
>
> I think you should be able to use other existing mmc DT bindings
> (perhaps also you need the brand new "mmc-ddr-3_3v"), instead of the
> "no-1-8-v".

OK I will try with this one. And if it works, I wonder if it worth
mentioning it as it is also part of the mmc binding.

Gregory

>
> Kind regards
> Uffe

-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com