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Subject[PATCH] drm/panel: simple: Support reset GPIOs
Date
The panel common bindings provide a gpios-reset property which is
active low by default. Let's support it in the simple driver.

De-asserting the reset pin implies a physical high, which in turns is
a logic low.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
---
drivers/gpu/drm/panel/panel-simple.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index 5d487686d25c..15dd495c347d 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -110,6 +110,7 @@ struct panel_simple {
struct i2c_adapter *ddc;

struct gpio_desc *enable_gpio;
+ struct gpio_desc *reset_gpio;

struct drm_display_mode override_mode;
};
@@ -433,12 +434,21 @@ static int panel_simple_probe(struct device *dev, const struct panel_desc *desc)
if (IS_ERR(panel->supply))
return PTR_ERR(panel->supply);

+ panel->reset_gpio = devm_gpiod_get_optional(dev, "reset",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(panel->reset_gpio)) {
+ err = PTR_ERR(panel->reset_gpio);
+ if (err != -EPROBE_DEFER)
+ dev_err(dev, "failed to request reset pin: %d\n", err);
+ return err;
+ }
+
panel->enable_gpio = devm_gpiod_get_optional(dev, "enable",
GPIOD_OUT_LOW);
if (IS_ERR(panel->enable_gpio)) {
err = PTR_ERR(panel->enable_gpio);
if (err != -EPROBE_DEFER)
- dev_err(dev, "failed to request GPIO: %d\n", err);
+ dev_err(dev, "failed to request enable pin: %d\n", err);
return err;
}

--
2.20.1
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