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drm/tilcdc: panel: Add support for enable GPIO

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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:
Ezequiel Garcia 2014-09-02 09:51:22 -03:00 committed by Dave Airlie
parent 12778fc143
commit d898ce0367
2 changed files with 34 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/devicetree/bindings/drm/tilcdc/panel.txt
View File

@ -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>;

37
drivers/gpu/drm/tilcdc/tilcdc_panel.c
View File

@ -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;