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drm/panel: lvds: Add support for the power-supply property

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A significant number of panels need to power up a regulator in order to
operate properly. Add support for the power-supply property to enable and
disable such a regulator whenever needed.

Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Link: https://patchwork.freedesktop.org/patch/msgid/0c0819bdf88fa948188df95e57a10820a8a4548d.1513854122.git-series.maxime.ripard@free-electrons.com
This commit is contained in:
Maxime Ripard 2017-12-21 12:02:28 +01:00
parent 2e7e2ebc68
commit a1c55bccf6
No known key found for this signature in database
GPG key ID: D2B4C094214DAF74
1 changed files with 23 additions and 0 deletions
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23
drivers/gpu/drm/panel/panel-lvds.c
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@ -17,6 +17,7 @@
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <drm/drmP.h>
@ -39,6 +40,7 @@ struct panel_lvds {
bool data_mirror;
struct backlight_device *backlight;
struct regulator *supply;
struct gpio_desc *enable_gpio;
struct gpio_desc *reset_gpio;
@ -69,6 +71,9 @@ static int panel_lvds_unprepare(struct drm_panel *panel)
if (lvds->enable_gpio)
gpiod_set_value_cansleep(lvds->enable_gpio, 0);
if (lvds->supply)
regulator_disable(lvds->supply);
return 0;
}
@ -76,6 +81,17 @@ static int panel_lvds_prepare(struct drm_panel *panel)
{
struct panel_lvds *lvds = to_panel_lvds(panel);
if (lvds->supply) {
int err;
err = regulator_enable(lvds->supply);
if (err < 0) {
dev_err(lvds->dev, "failed to enable supply: %d\n",
err);
return err;
}
}
if (lvds->enable_gpio)
gpiod_set_value_cansleep(lvds->enable_gpio, 1);
@ -196,6 +212,13 @@ static int panel_lvds_probe(struct platform_device *pdev)
if (ret < 0)
return ret;
lvds->supply = devm_regulator_get_optional(lvds->dev, "power");
if (IS_ERR(lvds->supply)) {
ret = PTR_ERR(lvds->supply);
dev_err(lvds->dev, "failed to request regulator: %d\n", ret);
return ret;
}
/* Get GPIOs and backlight controller. */
lvds->enable_gpio = devm_gpiod_get_optional(lvds->dev, "enable",
GPIOD_OUT_LOW);