linux-kernel - [PATCH 2/2] drm: bridge: add enable gpio for display-connector

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Message-Id: <20251028-enable-gpio-dp-connector-v1-2-2babdf1d2289@oss.qualcomm.com>
Date: Tue, 28 Oct 2025 20:56:50 +0530
From: Prahlad Valluru <venkata.valluru@....qualcomm.com>
To: David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <rfoss@...nel.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>
Cc: dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Prahlad Valluru <venkata.valluru@....qualcomm.com>
Subject: [PATCH 2/2] drm: bridge: add enable gpio for display-connector

In some cases, need gpio to be set for the connector
enable. Add optional enable gpio to display-connector.

Signed-off-by: Prahlad Valluru <venkata.valluru@....qualcomm.com>
---
 drivers/gpu/drm/bridge/display-connector.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/bridge/display-connector.c b/drivers/gpu/drm/bridge/display-connector.c
index e9f16dbc9535..52f5e4175e64 100644
--- a/drivers/gpu/drm/bridge/display-connector.c
+++ b/drivers/gpu/drm/bridge/display-connector.c
@@ -21,6 +21,7 @@ struct display_connector {
 	struct drm_bridge	bridge;
 
 	struct gpio_desc	*hpd_gpio;
+	struct gpio_desc	*enable_gpio;
 	int			hpd_irq;
 
 	struct regulator	*supply;
@@ -298,6 +299,12 @@ static int display_connector_probe(struct platform_device *pdev)
 					     "Unable to retrieve HPD GPIO\n");
 
 		conn->hpd_irq = gpiod_to_irq(conn->hpd_gpio);
+
+		conn->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
+							 GPIOD_OUT_HIGH);
+		if (IS_ERR(conn->enable_gpio))
+			return dev_err_probe(&pdev->dev, PTR_ERR(conn->enable_gpio),
+					     "Unable to retrieve enable GPIO\n");
 	} else {
 		conn->hpd_irq = -EINVAL;
 	}

-- 
2.34.1