[PATCH] clocksource/drivers/timer-mediatek: Make timer-mediatek become loadable module

[walter.chang at mediatek.com]

From: Chun-Hung Wu <chun-hung.wu at mediatek.com>

This patch makes the timer-mediatek driver which can
register an always-on timer as tick_broadcast_device
on MediaTek SoCs become loadable module in GKI.

This patch depends on the previous patch.
https://lore.kernel.org/lkml/20230208094813.20874-1-walter.chang@mediatek.com/T/#t

Signed-off-by: Chun-Hung Wu <chun-hung.wu at mediatek.com>
---
 drivers/clocksource/Kconfig          |  2 +-
 drivers/clocksource/timer-mediatek.c | 43 ++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+), 1 deletion(-)

diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index 4469e7f555e9..41345827055b 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -472,7 +472,7 @@ config SYS_SUPPORTS_SH_CMT
 	bool
 
 config MTK_TIMER
-	bool "Mediatek timer driver" if COMPILE_TEST
+	tristate "Mediatek timer driver"
 	depends on HAS_IOMEM
 	select TIMER_OF
 	select CLKSRC_MMIO
diff --git a/drivers/clocksource/timer-mediatek.c b/drivers/clocksource/timer-mediatek.c
index d5b29fd03ca2..806044ef391c 100644
--- a/drivers/clocksource/timer-mediatek.c
+++ b/drivers/clocksource/timer-mediatek.c
@@ -13,6 +13,9 @@
 #include <linux/clocksource.h>
 #include <linux/interrupt.h>
 #include <linux/irqreturn.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
 #include <linux/sched_clock.h>
 #include <linux/slab.h>
 #include "timer-of.h"
@@ -450,6 +453,46 @@ static int __init mtk_gpt_init(struct device_node *node)
 
 	return 0;
 }
+
+#ifdef MODULE
+static int mtk_timer_probe(struct platform_device *pdev)
+{
+	int (*timer_init)(struct device_node *node);
+	struct device_node *np = pdev->dev.of_node;
+
+	timer_init = of_device_get_match_data(&pdev->dev);
+	return timer_init(np);
+}
+
+static const struct of_device_id mtk_timer_match_table[] = {
+	{
+		.compatible = "mediatek,mt6577-timer",
+		.data = mtk_gpt_init,
+	},
+	{
+		.compatible = "mediatek,mt6765-timer",
+		.data = mtk_syst_init,
+	},
+	{
+		.compatible = "mediatek,mt6795-systimer",
+		.data = mtk_cpux_init,
+	},
+	{}
+};
+
+static struct platform_driver mtk_timer_driver = {
+	.probe = mtk_timer_probe,
+	.driver = {
+		.name = "mtk-timer",
+		.of_match_table = mtk_timer_match_table,
+	},
+};
+MODULE_DESCRIPTION("MEDIATEK Module Timer driver");
+MODULE_LICENSE("GPL v2");
+
+module_platform_driver(mtk_timer_driver);
+#else
 TIMER_OF_DECLARE(mtk_mt6577, "mediatek,mt6577-timer", mtk_gpt_init);
 TIMER_OF_DECLARE(mtk_mt6765, "mediatek,mt6765-timer", mtk_syst_init);
 TIMER_OF_DECLARE(mtk_mt6795, "mediatek,mt6795-systimer", mtk_cpux_init);
+#endif
-- 
2.18.0