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

Sui Jingfeng
2024-01-22T16:32:42Z

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@linux.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@ideasonboard.com>");
MODULE_DESCRIPTION("Display connector driver");
MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:display-connector");
--
2.25.1