linux-kernel - [PATCH V4 04/11] coresight: Add helpers registering/removing both AMBA and platform drivers

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Message-Id: <20240123054608.1790189-5-anshuman.khandual@arm.com>
Date: Tue, 23 Jan 2024 11:16:01 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: linux-arm-kernel@...ts.infradead.org,
	suzuki.poulose@....com
Cc: Anshuman Khandual <anshuman.khandual@....com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Sudeep Holla <sudeep.holla@....com>,
	Mike Leach <mike.leach@...aro.org>,
	James Clark <james.clark@....com>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	coresight@...ts.linaro.org,
	linux-stm32@...md-mailman.stormreply.com,
	Leo Yan <leo.yan@...aro.org>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: [PATCH V4 04/11] coresight: Add helpers registering/removing both AMBA and platform drivers

This adds two different helpers i.e coresight_init_driver()/remove_driver()
enabling coresight devices to register or remove AMBA and platform drivers.

Cc: Suzuki K Poulose <suzuki.poulose@....com>
Cc: Mike Leach <mike.leach@...aro.org>
Cc: James Clark <james.clark@....com>
Cc: Leo Yan <leo.yan@...aro.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
Cc: coresight@...ts.linaro.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
 drivers/hwtracing/coresight/coresight-core.c | 29 ++++++++++++++++++++
 include/linux/coresight.h                    |  7 +++++
 2 files changed, 36 insertions(+)

diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c
index d7f0e231feb9..4e897cc5da81 100644
--- a/drivers/hwtracing/coresight/coresight-core.c
+++ b/drivers/hwtracing/coresight/coresight-core.c
@@ -1836,6 +1836,35 @@ static void __exit coresight_exit(void)
 module_init(coresight_init);
 module_exit(coresight_exit);
 
+int coresight_init_driver(const char *drv, struct amba_driver *amba_drv,
+			  struct platform_driver *pdev_drv)
+{
+	int ret;
+
+	ret = amba_driver_register(amba_drv);
+	if (ret) {
+		pr_err("%s: error registering AMBA driver\n", drv);
+		return ret;
+	}
+
+	ret = platform_driver_register(pdev_drv);
+	if (!ret)
+		return 0;
+
+	pr_err("%s: error registering platform driver\n", drv);
+	amba_driver_unregister(amba_drv);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(coresight_init_driver);
+
+void coresight_remove_driver(struct amba_driver *amba_drv,
+			     struct platform_driver *pdev_drv)
+{
+	amba_driver_unregister(amba_drv);
+	platform_driver_unregister(pdev_drv);
+}
+EXPORT_SYMBOL_GPL(coresight_remove_driver);
+
 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR("Pratik Patel <pratikp@...eaurora.org>");
 MODULE_AUTHOR("Mathieu Poirier <mathieu.poirier@...aro.org>");
diff --git a/include/linux/coresight.h b/include/linux/coresight.h
index a4cb7dd6ca23..7e1646d4863c 100644
--- a/include/linux/coresight.h
+++ b/include/linux/coresight.h
@@ -12,6 +12,8 @@
 #include <linux/io.h>
 #include <linux/perf_event.h>
 #include <linux/sched.h>
+#include <linux/amba/bus.h>
+#include <linux/platform_device.h>
 
 /* Peripheral id registers (0xFD0-0xFEC) */
 #define CORESIGHT_PERIPHIDR4	0xfd0
@@ -598,6 +600,11 @@ void coresight_relaxed_write64(struct coresight_device *csdev,
 			       u64 val, u32 offset);
 void coresight_write64(struct coresight_device *csdev, u64 val, u32 offset);
 
+int coresight_init_driver(const char *drv, struct amba_driver *amba_drv,
+			  struct platform_driver *pdev_drv);
+
+void coresight_remove_driver(struct amba_driver *amba_drv,
+			     struct platform_driver *pdev_drv);
 #else
 static inline struct coresight_device *
 coresight_register(struct coresight_desc *desc) { return NULL; }
-- 
2.25.1