linux-kernel - Re: [PATCH v6 2/4] [media] platform: Add Synopsys Designware HDMI RX Controller Driver

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Date:   Fri, 7 Jul 2017 11:52:30 +0200
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Jose Abreu <Jose.Abreu@...opsys.com>,
        kbuild test robot <lkp@...el.com>
Cc:     kbuild-all@...org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Carlos Palminha <CARLOS.PALMINHA@...opsys.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Sylwester Nawrocki <snawrocki@...nel.org>
Subject: Re: [PATCH v6 2/4] [media] platform: Add Synopsys Designware HDMI RX
 Controller Driver

On 07/07/17 11:34, Jose Abreu wrote:
> On 06-07-2017 21:52, kbuild test robot wrote:
>>    drivers/media//platform/dwc/dw-hdmi-rx.c: In function 'dw_hdmi_registered':
>>>> drivers/media//platform/dwc/dw-hdmi-rx.c:1452:9: error: implicit declaration of function 'v4l2_async_subnotifier_register' [-Werror=implicit-function-declaration]
>>      return v4l2_async_subnotifier_register(&dw_dev->sd,
>>             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>    drivers/media//platform/dwc/dw-hdmi-rx.c: In function 'dw_hdmi_unregistered':
>>>> drivers/media//platform/dwc/dw-hdmi-rx.c:1462:2: error: implicit declaration of function 'v4l2_async_subnotifier_unregister' [-Werror=implicit-function-declaration]
>>      v4l2_async_subnotifier_unregister(&dw_dev->v4l2_notifier);
> 
> This one is expected. Required patch was not merged yet.
> 
>>      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>    drivers/media//platform/dwc/dw-hdmi-rx.c: In function 'dw_hdmi_parse_dt':
>>    drivers/media//platform/dwc/dw-hdmi-rx.c:1555:22: warning: unused variable 'notifier' [-Wunused-variable]
>>      struct device_node *notifier, *phy_node, *np = dw_dev->of_node;
>>                          ^~~~~~~~
>>    drivers/media//platform/dwc/dw-hdmi-rx.c: In function 'dw_hdmi_rx_probe':
>>    drivers/media//platform/dwc/dw-hdmi-rx.c:1765:1: warning: label 'err_phy' defined but not used [-Wunused-label]
>>     err_phy:
>>     ^~~~~~~
>>    cc1: some warnings being treated as errors
>>
>>
> 
> These two is due to cec not being enabled. I hate to wrap this
> around a #ifdef but is either this or extract cec to a separate
> file, which I don't think is the best solution because the cec
> code is quite small.

The notifier functions can also be used if CEC_NOTIFIER isn't set.
See cec-notifier.h for the stub functions.

That will help somewhat.

Regards,

	Hans