| 1 | |
| 2 | |
| 3 | * generic videomode helper
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| 4 | *
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| 5 | * Copyright (c) 2012 Steffen Trumtrar <[email protected]>, Pengutronix
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| 6 |
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| 7 | #include <linux/errno.h>
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| 8 | #include <linux/export.h>
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| 9 | #include <linux/of.h>
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| 10 | #include <video/display_timing.h>
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| 11 | #include <video/of_display_timing.h>
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| 12 | #include <video/of_videomode.h>
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| 13 | #include <video/videomode.h>
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| 14 |
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| 15 | |
| 16 | * of_get_videomode - get the videomode #<index> from devicetree
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| 17 | * @np: devicenode with the display_timings
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| 18 | * @vm: set to return value
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| 19 | * @index: index into list of display_timings
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| 20 | * (Set this to OF_USE_NATIVE_MODE to use whatever mode is
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| 21 | * specified as native mode in the DT.)
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| 22 | *
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| 23 | * DESCRIPTION:
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| 24 | * Get a list of all display timings and put the one
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| 25 | * specified by index into *vm. This function should only be used, if
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| 26 | * only one videomode is to be retrieved. A driver that needs to work
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| 27 | * with multiple/all videomodes should work with
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| 28 | * of_get_display_timings instead.
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| 29 | *
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| 30 | int of_get_videomode(struct device_node *np, struct videomode *vm,
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| 31 | int index)
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| 32 | {
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| 33 | struct display_timings *disp;
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| 34 | int ret;
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| 35 |
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| 36 | disp = of_get_display_timings(np);
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| 37 | if (!disp) {
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| 38 | pr_err("%pOF: no timings specified\n", np);
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| 39 | return -EINVAL;
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| 40 | }
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| 41 |
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| 42 | if (index == OF_USE_NATIVE_MODE)
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| 43 | index = disp->native_mode;
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| 44 |
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| 45 | ret = videomode_from_timings(disp, vm, index);
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| 46 |
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| 47 | display_timings_release(disp);
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| 48 |
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| 49 | return ret;
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| 50 | }
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| 51 | EXPORT_SYMBOL_GPL(of_get_videomode);
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