linux-kernel - Re: [PATCH] usb: dwc3-exynos fix unspecified suspend clk error handling

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Message-ID: <20170110185943.qxwnzjg6zzy4zbki@kozik-lap>
Date:   Tue, 10 Jan 2017 20:59:43 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Shuah Khan <shuahkh@....samsung.com>
Cc:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Anand Moon <linux.amoon@...il.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Javier Martinez Canillas <javier@....samsung.com>,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>,
        Linux USB Mailing List <linux-usb@...r.kernel.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb: dwc3-exynos fix unspecified suspend clk error
 handling

On Tue, Jan 10, 2017 at 11:37:24AM -0700, Shuah Khan wrote:
> On 01/10/2017 11:23 AM, Bartlomiej Zolnierkiewicz wrote:
> > I also think that regardless of what is decided on making susp_clk
> > non-optional for some Exynos SoCs we should probably remove the debug
> > message as it doesn't bring useful information and may be confusing.
> > 
> > Shuah, can you take care of this?
> 
> Yes. This message as it reads now is not only confusing, but also can
> lead users to think something is wrong.
> 
> I can get rid of it or I could change it from info to debug and change
> it to read:
> 
> "Optional Suspend clock isn't found. Diver operation isn't impacted"

It is even more confusing. If the clock is required (by binding, by
hardware) - make it an error. If it is completely not important - do not
print anything. If it is optional but helpful (enabling clock gives
someything) then print something... but it is not that case.

Best regards,
Krzysztof