Re: [PATCH 11/13] fbdev: omapfb: use of_graph_get_next_port()

[kernel test robot <lkp@intel.com>]

Hi Kuninori,

kernel test robot noticed the following build warnings:

[auto build test WARNING on broonie-sound/for-next]
[also build test WARNING on linus/master v6.8-rc1 next-20240125]
[cannot apply to robh/for-next drm-misc/drm-misc-next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Kuninori-Morimoto/of-property-add-port-base-loop/20240123-081427
base:   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next
patch link:    https://lore.kernel.org/r/874jf4ud77.wl-kuninori.morimoto.gx%40renesas.com
patch subject: [PATCH 11/13] fbdev: omapfb: use of_graph_get_next_port()
config: i386-buildonly-randconfig-003-20240127 (https://download.01.org/0day-ci/archive/20240127/202401272336.CCkvpjde-lkp@intel.com/config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240127/202401272336.CCkvpjde-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202401272336.CCkvpjde-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/video/fbdev/omap2/omapfb/dss/dss.c: In function 'dss_init_ports':
   drivers/video/fbdev/omap2/omapfb/dss/dss.c:925:9: error: implicit declaration of function 'of_graph_get_next_port'; did you mean 'of_get_next_parent'? [-Werror=implicit-function-declaration]
     port = of_graph_get_next_port(parent, NULL);
            ^~~~~~~~~~~~~~~~~~~~~~
            of_get_next_parent
>> drivers/video/fbdev/omap2/omapfb/dss/dss.c:925:7: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
     port = of_graph_get_next_port(parent, NULL);
          ^
   drivers/video/fbdev/omap2/omapfb/dss/dss.c:956:10: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
       (port = of_graph_get_next_port(parent, port)) != NULL);
             ^
   drivers/video/fbdev/omap2/omapfb/dss/dss.c: In function 'dss_uninit_ports':
   drivers/video/fbdev/omap2/omapfb/dss/dss.c:972:7: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
     port = of_graph_get_next_port(parent, NULL);
          ^
   drivers/video/fbdev/omap2/omapfb/dss/dss.c:1003:17: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
     } while ((port = of_graph_get_next_port(parent, port)) != NULL);
                    ^
   cc1: some warnings being treated as errors


vim +925 drivers/video/fbdev/omap2/omapfb/dss/dss.c

   915	
   916	static int dss_init_ports(struct platform_device *pdev)
   917	{
   918		struct device_node *parent = pdev->dev.of_node;
   919		struct device_node *port;
   920		int r, ret = 0;
   921	
   922		if (parent == NULL)
   923			return 0;
   924	
 > 925		port = of_graph_get_next_port(parent, NULL);
   926		if (!port)
   927			return 0;
   928	
   929		if (dss.feat->num_ports == 0)
   930			return 0;
   931	
   932		do {
   933			enum omap_display_type port_type;
   934			u32 reg;
   935	
   936			r = of_property_read_u32(port, "reg", &reg);
   937			if (r)
   938				reg = 0;
   939	
   940			if (reg >= dss.feat->num_ports)
   941				continue;
   942	
   943			port_type = dss.feat->ports[reg];
   944	
   945			switch (port_type) {
   946			case OMAP_DISPLAY_TYPE_DPI:
   947				ret = dpi_init_port(pdev, port);
   948				break;
   949			case OMAP_DISPLAY_TYPE_SDI:
   950				ret = sdi_init_port(pdev, port);
   951				break;
   952			default:
   953				break;
   954			}
   955		} while (!ret &&
   956			 (port = of_graph_get_next_port(parent, port)) != NULL);
   957	
   958		if (ret)
   959			dss_uninit_ports(pdev);
   960	
   961		return ret;
   962	}
   963	

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