Get videomode from devicetree in a format appropriate for the backend. drm_display_mode and fb_videomode are supported atm. Uses the display signal timings from of_display_timings
Signed-off-by: Philipp Zabel p.zabel@pengutronix.de Signed-off-by: Steffen Trumtrar s.trumtrar@pengutronix.de --- drivers/of/Kconfig | 6 ++++++ drivers/of/Makefile | 1 + drivers/of/of_videomode.c | 47 ++++++++++++++++++++++++++++++++++++++++++ include/linux/of_videomode.h | 15 ++++++++++++++ 4 files changed, 69 insertions(+) create mode 100644 drivers/of/of_videomode.c create mode 100644 include/linux/of_videomode.h
diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig index 781e773..0575ffe 100644 --- a/drivers/of/Kconfig +++ b/drivers/of/Kconfig @@ -89,4 +89,10 @@ config OF_DISPLAY_TIMINGS help helper to parse display timings from the devicetree
+config OF_VIDEOMODE + def_bool y + depends on VIDEOMODE + help + helper to get videomodes from the devicetree + endmenu # OF diff --git a/drivers/of/Makefile b/drivers/of/Makefile index c8e9603..09d556f 100644 --- a/drivers/of/Makefile +++ b/drivers/of/Makefile @@ -12,3 +12,4 @@ obj-$(CONFIG_OF_PCI) += of_pci.o obj-$(CONFIG_OF_PCI_IRQ) += of_pci_irq.o obj-$(CONFIG_OF_MTD) += of_mtd.o obj-$(CONFIG_OF_DISPLAY_TIMINGS) += of_display_timings.o +obj-$(CONFIG_OF_VIDEOMODE) += of_videomode.o diff --git a/drivers/of/of_videomode.c b/drivers/of/of_videomode.c new file mode 100644 index 0000000..91a26fc --- /dev/null +++ b/drivers/of/of_videomode.c @@ -0,0 +1,47 @@ +/* + * generic videomode helper + * + * Copyright (c) 2012 Steffen Trumtrar s.trumtrar@pengutronix.de, Pengutronix + * + * This file is released under the GPLv2 + */ +#include <linux/of.h> +#include <linux/of_display_timings.h> +#include <linux/of_videomode.h> +#include <linux/export.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 + * 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_timing_list instead. + **/ +int of_get_videomode(struct device_node *np, struct videomode *vm, int index) +{ + struct display_timings *disp; + int ret; + + disp = of_get_display_timing_list(np); + if (!disp) { + pr_err("%s: no timings specified\n", __func__); + return -EINVAL; + } + + if (index == OF_USE_NATIVE_MODE) + index = disp->native_mode; + + ret = videomode_from_timing(disp, vm, index); + if (ret) + return ret; + + display_timings_release(disp); + + return 0; +} +EXPORT_SYMBOL_GPL(of_get_videomode); diff --git a/include/linux/of_videomode.h b/include/linux/of_videomode.h new file mode 100644 index 0000000..01518e6 --- /dev/null +++ b/include/linux/of_videomode.h @@ -0,0 +1,15 @@ +/* + * Copyright 2012 Steffen Trumtrar s.trumtrar@pengutronix.de + * + * videomode of-helpers + * + * This file is released under the GPLv2 + */ + +#ifndef __LINUX_OF_VIDEOMODE_H +#define __LINUX_OF_VIDEOMODE_H + +#include <linux/videomode.h> + +int of_get_videomode(struct device_node *np, struct videomode *vm, int index); +#endif /* __LINUX_OF_VIDEOMODE_H */