[PATCH 5.10 062/575] reset: socfpga: add empty driver allowing consumers to probe

[Greg Kroah-Hartman]

From: Paweł Anikiel <pan@xxxxxxxxxxxx>

[ Upstream commit 3ad60b4b3570937f3278509fe6797a5093ce53f8 ]

The early reset driver doesn't ever probe, which causes consuming
devices to be unable to probe. Add an empty driver to set this device
as available, allowing consumers to probe.

Signed-off-by: Paweł Anikiel <pan@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210920124141.1166544-4-pan@xxxxxxxxxxxx
Signed-off-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/reset/reset-socfpga.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/drivers/reset/reset-socfpga.c b/drivers/reset/reset-socfpga.c
index bdd9842961960..f9fa7fde7afb1 100644
--- a/drivers/reset/reset-socfpga.c
+++ b/drivers/reset/reset-socfpga.c
@@ -85,3 +85,29 @@ void __init socfpga_reset_init(void)
 	for_each_matching_node(np, socfpga_early_reset_dt_ids)
 		a10_reset_init(np);
 }
+
+/*
+ * The early driver is problematic, because it doesn't register
+ * itself as a driver. This causes certain device links to prevent
+ * consumer devices from probing. The hacky solution is to register
+ * an empty driver, whose only job is to attach itself to the reset
+ * manager and call probe.
+ */
+static const struct of_device_id socfpga_reset_dt_ids[] = {
+	{ .compatible = "altr,rst-mgr", },
+	{ /* sentinel */ },
+};
+
+static int reset_simple_probe(struct platform_device *pdev)
+{
+	return 0;
+}
+
+static struct platform_driver reset_socfpga_driver = {
+	.probe	= reset_simple_probe,
+	.driver = {
+		.name		= "socfpga-reset",
+		.of_match_table	= socfpga_reset_dt_ids,
+	},
+};
+builtin_platform_driver(reset_socfpga_driver);
-- 
2.33.0