drm/panel: use gpiod interface for enable GPIO
Use the new GPIO descriptor interface to handle the panel's enable GPIO.
This considerably simplifies the code.
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
[treding@nvidia.com: rework to improve readability]
Signed-off-by: Thierry Reding <treding@nvidia.com>
diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index 0231945..87cc238 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -22,9 +22,8 @@
*/
#include <linux/backlight.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
#include <linux/module.h>
-#include <linux/of_gpio.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
@@ -44,9 +43,6 @@
} size;
};
-/* TODO: convert to gpiod_*() API once it's been merged */
-#define GPIO_ACTIVE_LOW (1 << 0)
-
struct panel_simple {
struct drm_panel base;
bool enabled;
@@ -57,8 +53,7 @@
struct regulator *supply;
struct i2c_adapter *ddc;
- unsigned long enable_gpio_flags;
- int enable_gpio;
+ struct gpio_desc *enable_gpio;
};
static inline struct panel_simple *to_panel_simple(struct drm_panel *panel)
@@ -110,12 +105,8 @@
backlight_update_status(p->backlight);
}
- if (gpio_is_valid(p->enable_gpio)) {
- if (p->enable_gpio_flags & GPIO_ACTIVE_LOW)
- gpio_set_value(p->enable_gpio, 1);
- else
- gpio_set_value(p->enable_gpio, 0);
- }
+ if (p->enable_gpio)
+ gpiod_set_value(p->enable_gpio, 0);
regulator_disable(p->supply);
p->enabled = false;
@@ -137,12 +128,8 @@
return err;
}
- if (gpio_is_valid(p->enable_gpio)) {
- if (p->enable_gpio_flags & GPIO_ACTIVE_LOW)
- gpio_set_value(p->enable_gpio, 0);
- else
- gpio_set_value(p->enable_gpio, 1);
- }
+ if (p->enable_gpio)
+ gpiod_set_value(p->enable_gpio, 1);
if (p->backlight) {
p->backlight->props.power = FB_BLANK_UNBLANK;
@@ -185,7 +172,6 @@
{
struct device_node *backlight, *ddc;
struct panel_simple *panel;
- enum of_gpio_flags flags;
int err;
panel = devm_kzalloc(dev, sizeof(*panel), GFP_KERNEL);
@@ -199,29 +185,20 @@
if (IS_ERR(panel->supply))
return PTR_ERR(panel->supply);
- panel->enable_gpio = of_get_named_gpio_flags(dev->of_node,
- "enable-gpios", 0,
- &flags);
- if (gpio_is_valid(panel->enable_gpio)) {
- unsigned int value;
-
- if (flags & OF_GPIO_ACTIVE_LOW)
- panel->enable_gpio_flags |= GPIO_ACTIVE_LOW;
-
- err = gpio_request(panel->enable_gpio, "enable");
- if (err < 0) {
- dev_err(dev, "failed to request GPIO#%u: %d\n",
- panel->enable_gpio, err);
+ panel->enable_gpio = devm_gpiod_get(dev, "enable");
+ if (IS_ERR(panel->enable_gpio)) {
+ err = PTR_ERR(panel->enable_gpio);
+ if (err != -ENOENT) {
+ dev_err(dev, "failed to request GPIO: %d\n", err);
return err;
}
- value = (panel->enable_gpio_flags & GPIO_ACTIVE_LOW) != 0;
-
- err = gpio_direction_output(panel->enable_gpio, value);
+ panel->enable_gpio = NULL;
+ } else {
+ err = gpiod_direction_output(panel->enable_gpio, 0);
if (err < 0) {
- dev_err(dev, "failed to setup GPIO%u: %d\n",
- panel->enable_gpio, err);
- goto free_gpio;
+ dev_err(dev, "failed to setup GPIO: %d\n", err);
+ return err;
}
}
@@ -230,10 +207,8 @@
panel->backlight = of_find_backlight_by_node(backlight);
of_node_put(backlight);
- if (!panel->backlight) {
- err = -EPROBE_DEFER;
- goto free_gpio;
- }
+ if (!panel->backlight)
+ return -EPROBE_DEFER;
}
ddc = of_parse_phandle(dev->of_node, "ddc-i2c-bus", 0);
@@ -265,9 +240,6 @@
free_backlight:
if (panel->backlight)
put_device(&panel->backlight->dev);
-free_gpio:
- if (gpio_is_valid(panel->enable_gpio))
- gpio_free(panel->enable_gpio);
return err;
}
@@ -287,9 +259,6 @@
if (panel->backlight)
put_device(&panel->backlight->dev);
- if (gpio_is_valid(panel->enable_gpio))
- gpio_free(panel->enable_gpio);
-
regulator_disable(panel->supply);
return 0;