coresight: stm: Allow to build coresight-stm as a module

- Kconfig becomes a tristate, to allow =m
- add a stm_remove function, for module unload
- add a MODULE_DEVICE_TABLE for autoloading on boot

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Suzuki K Poulose <Suzuki.Poulose@arm.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Russell King <linux@armlinux.org.uk>
Tested-by: Mike Leach <mike.leach@linaro.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Kim Phillips <kim.phillips@arm.com>
Signed-off-by: Tingwei Zhang <tingwei@codeaurora.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20200928163513.70169-8-mathieu.poirier@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 19 insertions, 1 deletions

diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c
index 2ba819a47cf6..b0ad912651a9 100644
--- a/drivers/hwtracing/coresight/coresight-stm.c
+++ b/drivers/hwtracing/coresight/coresight-stm.c
@@ -951,6 +951,17 @@ stm_unregister:
 	return ret;
 }
 
+static int __exit stm_remove(struct amba_device *adev)
+{
+	struct stm_drvdata *drvdata = dev_get_drvdata(&adev->dev);
+
+	coresight_unregister(drvdata->csdev);
+
+	stm_unregister_device(&drvdata->stm);
+
+	return 0;
+}
+
 #ifdef CONFIG_PM
 static int stm_runtime_suspend(struct device *dev)
 {
@@ -983,6 +994,8 @@ static const struct amba_id stm_ids[] = {
 	{ 0, 0},
 };
 
+MODULE_DEVICE_TABLE(amba, stm_ids);
+
 static struct amba_driver stm_driver = {
 	.drv = {
 		.name   = "coresight-stm",
@@ -991,7 +1004,12 @@ static struct amba_driver stm_driver = {
 		.suppress_bind_attrs = true,
 	},
 	.probe          = stm_probe,
+	.remove         = stm_remove,
 	.id_table	= stm_ids,
 };
 
-builtin_amba_driver(stm_driver);
+module_amba_driver(stm_driver);
+
+MODULE_AUTHOR("Pratik Patel <pratikp@codeaurora.org>");
+MODULE_DESCRIPTION("Arm CoreSight System Trace Macrocell driver");
+MODULE_LICENSE("GPL v2");