Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / video / of_videomode.c

diff --git a/kernel/drivers/video/of_videomode.c b/kernel/drivers/video/of_videomode.c
new file mode 100644 (file)
index 0000000..111c2d1
--- /dev/null
+++ b/kernel/drivers/video/of_videomode.c
@@ -0,0 +1,54 @@
+/*
+ * generic videomode helper
+ *
+ * Copyright (c) 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>, Pengutronix
+ *
+ * This file is released under the GPLv2
+ */
+#include <linux/errno.h>
+#include <linux/export.h>
+#include <linux/of.h>
+#include <video/display_timing.h>
+#include <video/of_display_timing.h>
+#include <video/of_videomode.h>
+#include <video/videomode.h>
+
+/**
+ * of_get_videomode - get the videomode #<index> from devicetree
+ * @np - devicenode with the display_timings
+ * @vm - set to return value
+ * @index - index into list of display_timings
+ *         (Set this to OF_USE_NATIVE_MODE to use whatever mode is
+ *          specified as native mode in the DT.)
+ *
+ * DESCRIPTION:
+ * Get a list of all display timings and put the one
+ * specified by index into *vm. This function should only be used, if
+ * only one videomode is to be retrieved. A driver that needs to work
+ * with multiple/all videomodes should work with
+ * of_get_display_timings instead.
+ **/
+int of_get_videomode(struct device_node *np, struct videomode *vm,
+                    int index)
+{
+       struct display_timings *disp;
+       int ret;
+
+       disp = of_get_display_timings(np);
+       if (!disp) {
+               pr_err("%s: no timings specified\n", of_node_full_name(np));
+               return -EINVAL;
+       }
+
+       if (index == OF_USE_NATIVE_MODE)
+               index = disp->native_mode;
+
+       ret = videomode_from_timings(disp, vm, index);
+       if (ret)
+               return ret;
+
+       display_timings_release(disp);
+
+       return 0;
+}
+EXPORT_SYMBOL_GPL(of_get_videomode);