diff options
Diffstat (limited to 'drivers/video/of_videomode.c')
| -rw-r--r-- | drivers/video/of_videomode.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/drivers/video/of_videomode.c b/drivers/video/of_videomode.c new file mode 100644 index 000000000..67aff2421 --- /dev/null +++ b/drivers/video/of_videomode.c @@ -0,0 +1,51 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * generic videomode helper + * + * Copyright (c) 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>, Pengutronix + */ +#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("%pOF: no timings specified\n", np); + return -EINVAL; + } + + if (index == OF_USE_NATIVE_MODE) + index = disp->native_mode; + + ret = videomode_from_timings(disp, vm, index); + + display_timings_release(disp); + + return ret; +} +EXPORT_SYMBOL_GPL(of_get_videomode); |