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From:   Chunyan Zhang <zhang.lyra@gmail.com>
To:     Daniel Lezcano <daniel.lezcano@linaro.org>,
        Thomas Gleixner <tglx@linutronix.de>
Cc:     Saravana Kannan <saravanak@google.com>,
        Baolin Wang <baolin.wang7@gmail.com>,
        Orson Zhai <orsonzhai@gmail.com>,
        Chunyan Zhang <zhang.lyra@gmail.com>,
        Chunyan Zhang <chunyan.zhang@unisoc.com>,
        LKML <linux-kernel@vger.kernel.org>
Subject: [PATCH v3 2/3] clocksource/drivers/timer-of: Add a boilerplate macro for timer module driver
Date:   Fri, 20 Aug 2021 17:47:30 +0800
Message-Id: <20210820094731.1890536-3-zhang.lyra@gmail.com>
In-Reply-To: <20210820094731.1890536-1-zhang.lyra@gmail.com>
References: <20210820094731.1890536-1-zhang.lyra@gmail.com>
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From: Chunyan Zhang <chunyan.zhang@unisoc.com>

To support module build, platform driver structs, .probe(), match table and
module macros need to be added to the timer driver. So this patch provides
a macro to take care of these things, and that would reduce the repeat
code lines in every sigle driver.

Since timer module should support loading only, we use
builtin_platform_driver() which doesn't include module_exit() to make
sure timer modules wouldn't be unloaded.

Signed-off-by: Chunyan Zhang <chunyan.zhang@unisoc.com>
---
 drivers/clocksource/timer-of.c | 13 +++++++++++++
 drivers/clocksource/timer-of.h | 15 +++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/drivers/clocksource/timer-of.c b/drivers/clocksource/timer-of.c
index 7f108978fd51..ecd7f7379400 100644
--- a/drivers/clocksource/timer-of.c
+++ b/drivers/clocksource/timer-of.c
@@ -8,7 +8,9 @@
 #include <linux/interrupt.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
+#include <linux/of_device.h>
 #include <linux/of_irq.h>
+#include <linux/platform_device.h>
 #include <linux/slab.h>
 
 #include "timer-of.h"
@@ -229,3 +231,14 @@ void timer_of_cleanup(struct timer_of *to)
 	if (to->flags & TIMER_OF_BASE)
 		timer_of_base_exit(&to->of_base);
 }
+
+int platform_timer_probe(struct platform_device *pdev)
+{
+	int (*init_cb)(struct device_node *node);
+	struct device_node *np = pdev->dev.of_node;
+
+	init_cb = of_device_get_match_data(&pdev->dev);
+
+	return init_cb(np);
+}
+EXPORT_SYMBOL_GPL(platform_timer_probe);
diff --git a/drivers/clocksource/timer-of.h b/drivers/clocksource/timer-of.h
index 1b8cfac5900a..04a476da01bb 100644
--- a/drivers/clocksource/timer-of.h
+++ b/drivers/clocksource/timer-of.h
@@ -3,6 +3,7 @@
 #define __TIMER_OF_H__
 
 #include <linux/clockchips.h>
+#include <linux/platform_device.h>
 
 #define TIMER_OF_BASE	0x1
 #define TIMER_OF_CLOCK	0x2
@@ -71,4 +72,18 @@ extern int timer_of_init(struct device_node *np,
 
 extern void timer_of_cleanup(struct timer_of *to);
 
+extern int platform_timer_probe(struct platform_device *pdev);
+
+#define TIMER_PLATFORM_DECLEAR(desc, drv_name, table)		\
+MODULE_DEVICE_TABLE(of, table);					\
+static struct platform_driver drv_name##_driver = {		\
+	.probe  = platform_timer_probe,				\
+	.driver = {						\
+		.name = #drv_name,				\
+		.of_match_table = table,			\
+	},							\
+};								\
+builtin_platform_driver(drv_name##_driver);			\
+MODULE_DESCRIPTION(desc);					\
+MODULE_LICENSE("GPL")
 #endif
-- 
2.25.1