From: Fabio Estevam <fabio.estevam@xxxxxxxxxxxxx> Introduce a helper that can be used to retrieve the GPIO via devicetree that is used to turn on a display. Tested on a mx28evk board. Signed-off-by: Fabio Estevam <fabio.estevam@xxxxxxxxxxxxx> --- Changes since v1: - Fix return value drivers/video/Kconfig | 6 +++++ drivers/video/Makefile | 1 + drivers/video/of_display_enable_gpio.c | 43 ++++++++++++++++++++++++++++++++ include/video/of_display_gpio.h | 17 +++++++++++++ 4 files changed, 67 insertions(+) create mode 100644 drivers/video/of_display_enable_gpio.c create mode 100644 include/video/of_display_gpio.h diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig index 0181a87..7607f42 100644 --- a/drivers/video/Kconfig +++ b/drivers/video/Kconfig @@ -52,6 +52,12 @@ config OF_VIDEOMODE help helper to get videomodes from the devicetree +config OF_DISPLAY_ENABLE_GPIO + bool "Support for enabling a panel via GPIO from the devicetree" + depends on OF + help + helper to turning on a panel via gpio from the devicetree + config HDMI bool diff --git a/drivers/video/Makefile b/drivers/video/Makefile index 97f7b6d..4d3ec70 100644 --- a/drivers/video/Makefile +++ b/drivers/video/Makefile @@ -176,3 +176,4 @@ obj-$(CONFIG_DISPLAY_TIMING) += display_timing.o obj-$(CONFIG_OF_DISPLAY_TIMING) += of_display_timing.o obj-$(CONFIG_VIDEOMODE) += videomode.o obj-$(CONFIG_OF_VIDEOMODE) += of_videomode.o +obj-$(CONFIG_OF_DISPLAY_ENABLE_GPIO) += of_display_enable_gpio.o diff --git a/drivers/video/of_display_enable_gpio.c b/drivers/video/of_display_enable_gpio.c new file mode 100644 index 0000000..d556854 --- /dev/null +++ b/drivers/video/of_display_enable_gpio.c @@ -0,0 +1,43 @@ +/* + * generic helper for enabling a panel via GPIO from the devicetree + * + * Copyright 2013 Freescale Semiconductor, Inc. + * + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ + +#include <linux/export.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/of_gpio.h> + +int of_get_display_gpio_enable(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + int panel_enable, ret; + enum of_gpio_flags flags; + + panel_enable = of_get_named_gpio_flags(np, "panel-enable-gpios", 0, + &flags); + + if (gpio_is_valid(panel_enable)) { + unsigned long f = GPIOF_OUT_INIT_HIGH; + if (flags == OF_GPIO_ACTIVE_LOW) + f = GPIOF_OUT_INIT_LOW; + ret = devm_gpio_request_one(&pdev->dev, panel_enable, f, + "panel-enable"); + if (ret) { + dev_err(&pdev->dev, "failed to request gpio %d: %d\n", + panel_enable, ret); + return ret; + } + } + + return 0; +} +EXPORT_SYMBOL_GPL(of_get_display_gpio_enable); diff --git a/include/video/of_display_gpio.h b/include/video/of_display_gpio.h new file mode 100644 index 0000000..a56b6a1 --- /dev/null +++ b/include/video/of_display_gpio.h @@ -0,0 +1,17 @@ +/* + * Copyright 2013 Freescale Semiconductor, Inc. + * + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ + +#ifndef __LINUX_OF_DISPLAY_GPIO_H +#define __LINUX_OF_DISPLAY_GPIO_H + +int of_get_display_gpio_enable(struct platform_device *pdev); + +#endif -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-fbdev" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
