linux-kernel - [PATCH 2/2] clocksource/drivers/sprd: Add module support to Spreadtrum timer

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Message-Id: <182aae1ed5e5d2b124f1a32686e5566c9a27c980.1585021186.git.baolin.wang7@gmail.com>
Date:   Tue, 24 Mar 2020 13:59:37 +0800
From:   Baolin Wang <baolin.wang7@...il.com>
To:     daniel.lezcano@...aro.org, tglx@...utronix.de
Cc:     saravanak@...gle.com, orsonzhai@...il.com, zhang.lyra@...il.com,
        baolin.wang7@...il.com, linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] clocksource/drivers/sprd: Add module support to Spreadtrum timer

Timers still have devices created for them. So, when compiling a timer
driver as a module, implement it as a normal platform device driver.

Signed-off-by: Saravana Kannan <saravanak@...gle.com>
Signed-off-by: Baolin Wang <baolin.wang7@...il.com>
---
 drivers/clocksource/Kconfig      |  2 +-
 drivers/clocksource/timer-sprd.c | 37 +++++++++++++++++++++++++++++++++++--
 2 files changed, 36 insertions(+), 3 deletions(-)

diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index cc909e4..404f7dc 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -481,7 +481,7 @@ config MTK_TIMER
 	  Support for Mediatek timer driver.
 
 config SPRD_TIMER
-	bool "Spreadtrum timer driver" if EXPERT
+	tristate "Spreadtrum timer driver" if EXPERT
 	depends on HAS_IOMEM
 	depends on (ARCH_SPRD || COMPILE_TEST)
 	default ARCH_SPRD
diff --git a/drivers/clocksource/timer-sprd.c b/drivers/clocksource/timer-sprd.c
index 430cb99..5461789 100644
--- a/drivers/clocksource/timer-sprd.c
+++ b/drivers/clocksource/timer-sprd.c
@@ -5,6 +5,8 @@
 
 #include <linux/init.h>
 #include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
 
 #include "timer-of.h"
 
@@ -141,7 +143,7 @@ static irqreturn_t sprd_timer_interrupt(int irq, void *dev_id)
 	},
 };
 
-static int __init sprd_timer_init(struct device_node *np)
+static int sprd_timer_init(struct device_node *np)
 {
 	int ret;
 
@@ -190,7 +192,7 @@ static void sprd_suspend_timer_disable(struct clocksource *cs)
 	.flags	= CLOCK_SOURCE_IS_CONTINUOUS | CLOCK_SOURCE_SUSPEND_NONSTOP,
 };
 
-static int __init sprd_suspend_timer_init(struct device_node *np)
+static int sprd_suspend_timer_init(struct device_node *np)
 {
 	int ret;
 
@@ -204,6 +206,37 @@ static int __init sprd_suspend_timer_init(struct device_node *np)
 	return 0;
 }
 
+#ifdef MODULE
+static int sprd_timer_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+
+	if (of_property_read_bool(np, "interrupts"))
+		return sprd_timer_init(np);
+
+	return sprd_suspend_timer_init(np);
+}
+
+static const struct of_device_id sprd_timer_match_table[] = {
+	{ .compatible = "sprd,sc9860-suspend-timer" },
+	{ .compatible = "sprd,sc9860-timer" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, sprd_timer_match_table);
+
+static struct platform_driver sprd_timer_driver = {
+	.probe		= sprd_timer_probe,
+	.driver		= {
+		.name	= "sprd-timer",
+		.of_match_table = sprd_timer_match_table,
+	},
+};
+module_platform_driver(sprd_timer_driver);
+
+#else
 TIMER_OF_DECLARE(sc9860_timer, "sprd,sc9860-timer", sprd_timer_init);
 TIMER_OF_DECLARE(sc9860_persistent_timer, "sprd,sc9860-suspend-timer",
 		 sprd_suspend_timer_init);
+#endif
+
+MODULE_LICENSE("GPL v2");
-- 
1.9.1