[alsa-devel] [asoc:topic/drm 1/1] drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c:88:21: error: storage size of 'of_ep' isn't known

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git topic/drm
head:   e3839bd6f56a291f00a4c3737eb15ca0344a82a9
commit: e3839bd6f56a291f00a4c3737eb15ca0344a82a9 [1/1] drm: dw-hdmi-i2s: add .get_dai_id callback for ALSA SoC
config: i386-allmodconfig (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout e3839bd6f56a291f00a4c3737eb15ca0344a82a9
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c:85:42: warning: 'struct snd_soc_component' declared inside parameter list will not be visible outside of this definition or declaration
    static int dw_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
                                             ^~~~~~~~~~~~~~~~~
   drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c: In function 'dw_hdmi_i2s_get_dai_id':
>> drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c:88:21: error: storage size of 'of_ep' isn't known
     struct of_endpoint of_ep;
                        ^~~~~
>> drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c:91:8: error: implicit declaration of function 'of_graph_parse_endpoint' [-Werror=implicit-function-declaration]
     ret = of_graph_parse_endpoint(endpoint, &of_ep);
           ^~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c:88:21: warning: unused variable 'of_ep' [-Wunused-variable]
     struct of_endpoint of_ep;
                        ^~~~~
   drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c: At top level:
>> drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c:108:2: error: unknown field 'get_dai_id' specified in initializer
     .get_dai_id = dw_hdmi_i2s_get_dai_id,
     ^
>> drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c:108:16: error: initialization from incompatible pointer type [-Werror=incompatible-pointer-types]
     .get_dai_id = dw_hdmi_i2s_get_dai_id,
                   ^~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c:108:16: note: (near initialization for 'dw_hdmi_i2s_ops.digital_mute')
   cc1: some warnings being treated as errors

vim +88 drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c

    79	
    80		dw_hdmi_audio_disable(hdmi);
    81	
    82		hdmi_write(audio, HDMI_AUD_CONF0_SW_RESET, HDMI_AUD_CONF0);
    83	}
    84	
  > 85	static int dw_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
    86					  struct device_node *endpoint)
    87	{
  > 88		struct of_endpoint of_ep;
    89		int ret;
    90	
  > 91		ret = of_graph_parse_endpoint(endpoint, &of_ep);
    92		if (ret < 0)
    93			return ret;
    94	
    95		/*
    96		 * HDMI sound should be located as reg = <2>
    97		 * Then, it is sound port 0
    98		 */
    99		if (of_ep.port == 2)
   100			return 0;
   101	
   102		return -EINVAL;
   103	}
   104	
   105	static struct hdmi_codec_ops dw_hdmi_i2s_ops = {
   106		.hw_params	= dw_hdmi_i2s_hw_params,
   107		.audio_shutdown	= dw_hdmi_i2s_audio_shutdown,
 > 108		.get_dai_id	= dw_hdmi_i2s_get_dai_id,
   109	};
   110	
   111	static int snd_dw_hdmi_probe(struct platform_device *pdev)

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