linux-kernel - [PATCH 4/5] drm/bridge: display-connector: Extend match support for non-DT based systems

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Date: Tue, 23 Jan 2024 00:32:19 +0800
From: Sui Jingfeng <sui.jingfeng@...ux.dev>
To: David Airlie <airlied@...il.com>
Cc: Neil Armstrong <neil.armstrong@...aro.org>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	Daniel Vetter <daniel@...ll.ch>,
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	Sui Jingfeng <sui.jingfeng@...ux.dev>
Subject: [PATCH 4/5] drm/bridge: display-connector: Extend match support for non-DT based systems

On which case the driver is not probed by OF, Instead, a fwnode is
associated to the platform device before this driver is probed. The newly
added code is intended to be used on non-DT environment. It is assumed
that there is a string fwnode property associated with the platform device,
the name of the string property is compatible, the value of the string
property is used to get platform match data.

Signed-off-by: Sui Jingfeng <sui.jingfeng@...ux.dev>
---
 drivers/gpu/drm/bridge/display-connector.c | 24 +++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/display-connector.c b/drivers/gpu/drm/bridge/display-connector.c
index 08bd5695ddae..eb7e194e7735 100644
--- a/drivers/gpu/drm/bridge/display-connector.c
+++ b/drivers/gpu/drm/bridge/display-connector.c
@@ -202,6 +202,24 @@ static int display_connector_get_supply(struct platform_device *pdev,
 	return PTR_ERR_OR_ZERO(conn->supply);
 }
 
+static const void *display_connector_get_match_data(const struct device *dev)
+{
+	const struct of_device_id *matches = dev->driver->of_match_table;
+
+	/* Try to get the match data by software node */
+	while (matches) {
+		if (!matches->compatible[0])
+			break;
+
+		if (device_is_compatible(dev, matches->compatible))
+			return matches->data;
+
+		matches++;
+	}
+
+	return NULL;
+}
+
 static int display_connector_probe(struct platform_device *pdev)
 {
 	struct display_connector *conn;
@@ -215,7 +233,10 @@ static int display_connector_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, conn);
 
-	type = (uintptr_t)of_device_get_match_data(&pdev->dev);
+	if (pdev->dev.of_node)
+		type = (uintptr_t)of_device_get_match_data(&pdev->dev);
+	else
+		type = (uintptr_t)display_connector_get_match_data(&pdev->dev);
 
 	/* Get the exact connector type. */
 	switch (type) {
@@ -434,3 +455,4 @@ module_platform_driver(display_connector_driver);
 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@...asonboard.com>");
 MODULE_DESCRIPTION("Display connector driver");
 MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:display-connector");
-- 
2.25.1