mirror of
https://github.com/torvalds/linux.git
synced 2024-12-05 02:23:16 +00:00
drm/tilcdc: panel: Add support for enable GPIO
In order to support the "enable GPIO" available in many panel devices, this commit adds a proper devicetree binding. By providing an enable GPIO in the devicetree, the driver can now turn off and on the panel device, and/or the backlight device. Both the backlight and the GPIO are optional properties. Tested-by: Darren Etheridge <detheridge@ti.com> Tested-by: Johannes Pointner <johannes.pointner@br-automation.com> Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar> Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
parent
12778fc143
commit
d898ce0367
@ -20,6 +20,7 @@ Required properties:
|
||||
|
||||
Optional properties:
|
||||
- backlight: phandle of the backlight device attached to the panel
|
||||
- enable-gpios: GPIO pin to enable or disable the panel
|
||||
|
||||
Recommended properties:
|
||||
- pinctrl-names, pinctrl-0: the pincontrol settings to configure
|
||||
@ -33,6 +34,7 @@ Example:
|
||||
pinctrl-names = "default";
|
||||
pinctrl-0 = <&bone_lcd3_cape_lcd_pins>;
|
||||
backlight = <&backlight>;
|
||||
enable-gpios = <&gpio3 19 0>;
|
||||
|
||||
panel-info {
|
||||
ac-bias = <255>;
|
||||
|
@ -18,6 +18,7 @@
|
||||
#include <linux/pinctrl/pinmux.h>
|
||||
#include <linux/pinctrl/consumer.h>
|
||||
#include <linux/backlight.h>
|
||||
#include <linux/gpio/consumer.h>
|
||||
#include <video/display_timing.h>
|
||||
#include <video/of_display_timing.h>
|
||||
#include <video/videomode.h>
|
||||
@ -29,6 +30,7 @@ struct panel_module {
|
||||
struct tilcdc_panel_info *info;
|
||||
struct display_timings *timings;
|
||||
struct backlight_device *backlight;
|
||||
struct gpio_desc *enable_gpio;
|
||||
};
|
||||
#define to_panel_module(x) container_of(x, struct panel_module, base)
|
||||
|
||||
@ -55,13 +57,17 @@ static void panel_encoder_dpms(struct drm_encoder *encoder, int mode)
|
||||
{
|
||||
struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
|
||||
struct backlight_device *backlight = panel_encoder->mod->backlight;
|
||||
struct gpio_desc *gpio = panel_encoder->mod->enable_gpio;
|
||||
|
||||
if (!backlight)
|
||||
return;
|
||||
if (backlight) {
|
||||
backlight->props.power = mode == DRM_MODE_DPMS_ON ?
|
||||
FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
|
||||
backlight_update_status(backlight);
|
||||
}
|
||||
|
||||
backlight->props.power = mode == DRM_MODE_DPMS_ON
|
||||
? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
|
||||
backlight_update_status(backlight);
|
||||
if (gpio)
|
||||
gpiod_set_value_cansleep(gpio,
|
||||
mode == DRM_MODE_DPMS_ON ? 1 : 0);
|
||||
}
|
||||
|
||||
static bool panel_encoder_mode_fixup(struct drm_encoder *encoder,
|
||||
@ -369,6 +375,25 @@ static int panel_probe(struct platform_device *pdev)
|
||||
dev_info(&pdev->dev, "found backlight\n");
|
||||
}
|
||||
|
||||
panel_mod->enable_gpio = devm_gpiod_get(&pdev->dev, "enable");
|
||||
if (IS_ERR(panel_mod->enable_gpio)) {
|
||||
ret = PTR_ERR(panel_mod->enable_gpio);
|
||||
if (ret != -ENOENT) {
|
||||
dev_err(&pdev->dev, "failed to request enable GPIO\n");
|
||||
goto fail_backlight;
|
||||
}
|
||||
|
||||
/* Optional GPIO is not here, continue silently. */
|
||||
panel_mod->enable_gpio = NULL;
|
||||
} else {
|
||||
ret = gpiod_direction_output(panel_mod->enable_gpio, 0);
|
||||
if (ret < 0) {
|
||||
dev_err(&pdev->dev, "failed to setup GPIO\n");
|
||||
goto fail_backlight;
|
||||
}
|
||||
dev_info(&pdev->dev, "found enable GPIO\n");
|
||||
}
|
||||
|
||||
mod = &panel_mod->base;
|
||||
pdev->dev.platform_data = mod;
|
||||
|
||||
@ -401,6 +426,8 @@ fail_timings:
|
||||
|
||||
fail_free:
|
||||
tilcdc_module_cleanup(mod);
|
||||
|
||||
fail_backlight:
|
||||
if (panel_mod->backlight)
|
||||
put_device(&panel_mod->backlight->dev);
|
||||
return ret;
|
||||
|
Loading…
Reference in New Issue
Block a user