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 --- drivers/gpu/drm/bridge/simple-bridge.c | 22 ++++++++++++++++++---- 1 file changed, 18 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/bridge/simple-bridge.c b/drivers/gpu/drm/bridge/simple-bridge.c index 20866c1230de..70e6092bdf6c 100644 --- a/drivers/gpu/drm/bridge/simple-bridge.c +++ b/drivers/gpu/drm/bridge/simple-bridge.c @@ -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) {