linux-kernel - Re: [PATCH v2 2/2] arm64: dts: hi6220: add resets property into dwmmc nodes

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Message-id: <f5dfafbb-39df-4edb-03b8-57c0e34c912f@samsung.com>
Date:   Fri, 28 Oct 2016 20:52:49 +0900
From:   Jaehoon Chung <jh80.chung@...sung.com>
To:     Leo Yan <leo.yan@...aro.org>
Cc:     Vincent Guittot <vincent.guittot@...aro.org>,
        John Stultz <john.stultz@...aro.org>,
        Guodong Xu <guodong.xu@...aro.org>,
        Wei Xu <xuwei5@...ilicon.com>,
        Rob Herring <robh+dt@...nel.org>,
        Rob Herring <rob.herring@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Xinliang Liu <xinliang.liu@...aro.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Fathi Boudra <fathi.boudra@...aro.org>,
        LAK <linux-arm-kernel@...ts.infradead.org>,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: Re: [PATCH v2 2/2] arm64: dts: hi6220: add resets property into dwmmc
 nodes

Hi,

On 10/28/2016 07:19 PM, Leo Yan wrote:
> On Fri, Oct 28, 2016 at 06:54:58PM +0900, Jaehoon Chung wrote:
> 
> [...]
> 
>>>>> Could you share the log? Is there any log about failure?
>>>>
>>>> Sure, please see below log:
>>>
>>> It's related with -EPROBE_DEFER..I'm not sure but if CONFIG_RESET_CONTROLLER is enabled, it's searching for reset controller.
>>> Maybe hi6220 has handled the reset controller(?)...
>>>
>>> I'm checking devm_reset_control_xxx...It's possible to occur the other boards which enabled RESET_CONTROLLER..
>>
>> Could you check the below thing..
>>
>>         /* find reset controller when exist */
>> -       pdata->rstc = devm_reset_control_get_optional(dev, NULL);
>> +       pdata->rstc = devm_reset_control_get_optional(dev, "dwmci-reset");
>>         if (IS_ERR(pdata->rstc)) {
>>                 if (PTR_ERR(pdata->rstc) == -EPROBE_DEFER)
>>                         return ERR_PTR(-EPROBE_DEFER);
> 
> Confirmed with this fixing, the kernel can bootup successfully.
> 
> Thanks for this.

Thanks for checking this..If this approach is not bad, i will send the patch.
Or if there are other good approaches, let me know, plz.

Best Regards,
Jaehoon Chung

> 
>> To prevent the wrong controlling, how about adding "#reset-names" for dwmmc controller?
>>
>>
>> Best Regards,
>> Jaehoon Chung
> 
> 
>