imx-drm: imx-drm-core: skip components whose parent device is disabled

In a board setup which disables LDB device node completely by changing
status to 'disabled', and only enables HDMI device, we're running into
the problem that imx-drm master never succeeds in binding, and hence
HDMI does not come up either.

&ldb {
	status = "disabled";

	lvds-channel@1 {
		...
		status = "okay";
	};
};

The imx-drm-core should really skip the LVDS channels no matter what
lvds-channel's status is, if LDB device is disabled.  Let's consider
such setup a misconfiguration, give a warning in there and not add the
component.

Signed-off-by: Shawn Guo <shawn.guo@freescale.com>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/drivers/staging/imx-drm/imx-drm-core.c b/drivers/staging/imx-drm/imx-drm-core.c
index bc7f8bd227c7186a2e054d82a19c75ebcd72ea4a..c270c9ae6d27711d531ebb54a07b1cdc125be9da 100644 (file)
--- a/drivers/staging/imx-drm/imx-drm-core.c
+++ b/drivers/staging/imx-drm/imx-drm-core.c
@@ -675,6 +675,11 @@ static int imx_drm_platform_probe(struct platform_device *pdev)
                        if (!remote || !of_device_is_available(remote)) {
                                of_node_put(remote);
                                continue;
+                       } else if (!of_device_is_available(remote->parent)) {
+                               dev_warn(&pdev->dev, "parent device of %s is not available\n",
+                                        remote->full_name);
+                               of_node_put(remote);
+                               continue;
                        }
 
                        ret = imx_drm_add_component(&pdev->dev, remote);