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drm/bridge: simple-bridge: Add support for enable GPIO

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If an enable GPIO is declared in the firmware, assert it when enabling
the bridge and deassert it when disabling it.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Reviewed-by: Stefan Agner <stefan@agner.ch>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Tested-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200226112514.12455-14-laurent.pinchart@ideasonboard.com
This commit is contained in:
Laurent Pinchart 2020-02-26 13:24:33 +02:00 committed by Tomi Valkeinen
parent 272378ec0e
commit 2df6428e29
1 changed files with 18 additions and 4 deletions
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22
drivers/gpu/drm/bridge/simple-bridge.c
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@ -6,6 +6,7 @@
* Maxime Ripard <maxime.ripard@free-electrons.com>
*/
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/of_graph.h>
@ -30,6 +31,7 @@ struct simple_bridge {
struct i2c_adapter *ddc;
struct regulator *vdd;
struct gpio_desc *enable;
};
static inline struct simple_bridge *
@ -143,19 +145,23 @@ static int simple_bridge_attach(struct drm_bridge *bridge,
static void simple_bridge_enable(struct drm_bridge *bridge)
{
struct simple_bridge *sbridge = drm_bridge_to_simple_bridge(bridge);
int ret = 0;
int ret;
if (sbridge->vdd)
if (sbridge->vdd) {
ret = regulator_enable(sbridge->vdd);
if (ret)
DRM_ERROR("Failed to enable vdd regulator: %d\n", ret);
}
if (ret)
DRM_ERROR("Failed to enable vdd regulator: %d\n", ret);
gpiod_set_value_cansleep(sbridge->enable, 1);
}
static void simple_bridge_disable(struct drm_bridge *bridge)
{
struct simple_bridge *sbridge = drm_bridge_to_simple_bridge(bridge);
gpiod_set_value_cansleep(sbridge->enable, 0);
if (sbridge->vdd)
regulator_disable(sbridge->vdd);
}
@ -208,6 +214,14 @@ static int simple_bridge_probe(struct platform_device *pdev)
dev_dbg(&pdev->dev, "No vdd regulator found: %d\n", ret);
}
sbridge->enable = devm_gpiod_get_optional(&pdev->dev, "enable",
GPIOD_OUT_LOW);
if (IS_ERR(sbridge->enable)) {
if (PTR_ERR(sbridge->enable) != -EPROBE_DEFER)
dev_err(&pdev->dev, "Unable to retrieve enable GPIO\n");
return PTR_ERR(sbridge->enable);
}
sbridge->ddc = simple_bridge_retrieve_ddc(&pdev->dev);
if (IS_ERR(sbridge->ddc)) {
if (PTR_ERR(sbridge->ddc) == -ENODEV) {