clocksource: samsung_pwm_timer: Add support for non-DT platforms

This patch extends the driver to support platforms that still use legacy
ATAGS-based boot, without device tree, by providing an exported function
that can be used from platform code to initialize the clocksource.

Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Olof Johansson <olof@lixom.net>

3 files changed, 17 insertions, 3 deletions

diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index ff5b6d87d65a..6d6174978f95 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -70,7 +70,6 @@ config CLKSRC_METAG_GENERIC
 
 config CLKSRC_SAMSUNG_PWM
         bool
-        depends on OF
         select CLKSRC_MMIO
         help
           This is a new clocksource driver for the PWM timer found in
diff --git a/drivers/clocksource/samsung_pwm_timer.c b/drivers/clocksource/samsung_pwm_timer.c
index e3257fae04e6..9f4bd6aa2343 100644
--- a/drivers/clocksource/samsung_pwm_timer.c
+++ b/drivers/clocksource/samsung_pwm_timer.c
@@ -356,7 +356,7 @@ static void __init samsung_timer_resources(void)
 /*
  * PWM master driver
  */
-static void __init samsung_pwm_clocksource_init(void)
+static void __init _samsung_pwm_clocksource_init(void)
 {
         u8 mask;
         int channel;
@@ -378,6 +378,17 @@ static void __init samsung_pwm_clocksource_init(void)
         samsung_clocksource_init();
 }
 
+void __init samsung_pwm_clocksource_init(void __iomem *base,
+                        unsigned int *irqs, struct samsung_pwm_variant *variant)
+{
+        pwm.base = base;
+        memcpy(&pwm.variant, variant, sizeof(pwm.variant));
+        memcpy(pwm.irq, irqs, SAMSUNG_PWM_NUM * sizeof(*irqs));
+
+        _samsung_pwm_clocksource_init();
+}
+
+#ifdef CONFIG_CLKSRC_OF
 static void __init samsung_pwm_alloc(struct device_node *np,
                                      const struct samsung_pwm_variant *variant)
 {
@@ -414,7 +425,7 @@ static void __init samsung_pwm_alloc(struct device_node *np,
                 return;
         }
 
-        samsung_pwm_clocksource_init();
+        _samsung_pwm_clocksource_init();
 }
 
 static const struct samsung_pwm_variant s3c24xx_variant = {
@@ -468,3 +479,4 @@ static void __init s5p_pwm_clocksource_init(struct device_node *np)
         samsung_pwm_alloc(np, &s5p_variant);
 }
 CLOCKSOURCE_OF_DECLARE(s5pc100_pwm, "samsung,s5pc100-pwm", s5p_pwm_clocksource_init);
+#endif
diff --git a/include/clocksource/samsung_pwm.h b/include/clocksource/samsung_pwm.h
index b1d8fe706f1a..5c449c8199e9 100644
--- a/include/clocksource/samsung_pwm.h
+++ b/include/clocksource/samsung_pwm.h
@@ -30,4 +30,7 @@ struct samsung_pwm_variant {
         bool has_tint_cstat;
 };
 
+void samsung_pwm_clocksource_init(void __iomem *base,
+                unsigned int *irqs, struct samsung_pwm_variant *variant);
+
 #endif /* __CLOCKSOURCE_SAMSUNG_PWM_H */