Messages in this thread Patch in this message |  | | From | Miquel Raynal <> | Subject | [PATCH] drm/panel: simple: Support reset GPIOs | Date | Fri, 13 Dec 2019 19:13:25 +0100 |
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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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