drm: rockchip: Add basic drm driver

[Dan Carpenter]

Hello Mark Yao,

The patch 2048e3286f34: "drm: rockchip: Add basic drm driver" from
Aug 22, 2014, leads to the following static checker warning:

	drivers/gpu/drm/rockchip/rockchip_drm_vop.c:1383 vop_bind()
	warn: unsigned 'vop->irq' is never less than zero.

drivers/gpu/drm/rockchip/rockchip_drm_vop.c
  1381  
  1382          vop->irq = platform_get_irq(pdev, 0);
  1383          if (vop->irq < 0) {
                    ^^^^^^^^^^^^
Doesn't work.

  1384                  dev_err(dev, "cannot find irq for vop\n");
  1385                  return vop->irq;
  1386          }
  1387  

	drivers/gpu/drm/rockchip/rockchip_drm_vop.c:1188 vop_create_crtc()
	warn: missing error code here? 'of_get_child_by_name()' failed.

  1184          port = of_get_child_by_name(dev->of_node, "port");
  1185          if (!port) {
  1186                  DRM_ERROR("no port node found in %s\n",
  1187                            dev->of_node->full_name);

Probably, "ret = -ENODEV;"

  1188                  goto err_cleanup_crtc;
  1189          }
  1190  


regards,
dan carpenter