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From 9cb47bf175645d15f97e6d964dd4a4f089275ef5 Mon Sep 17 00:00:00 2001
From: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Date: Tue, 13 Aug 2013 11:43:13 -0300
Subject: [PATCH 168/203] clocksource: armada-370-xp: Introduce new compatibles
The Armada XP SoC clocksource driver cannot work without the 25 MHz
fixed timer. Therefore it's appropriate to introduce a new compatible
string and use it to set the 25 MHz fixed timer.
The 'marvell,timer-25MHz' property will be marked as deprecated.
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
---
drivers/clocksource/time-armada-370-xp.c | 54 +++++++++++++++++++++++---------
1 file changed, 39 insertions(+), 15 deletions(-)
--- a/drivers/clocksource/time-armada-370-xp.c
+++ b/drivers/clocksource/time-armada-370-xp.c
@@ -13,6 +13,19 @@
*
* Timer 0 is used as free-running clocksource, while timer 1 is
* used as clock_event_device.
+ *
+ * ---
+ * Clocksource driver for Armada 370 and Armada XP SoC.
+ * This driver implements one compatible string for each SoC, given
+ * each has its own characteristics:
+ *
+ * * Armada 370 has no 25 MHz fixed timer.
+ *
+ * * Armada XP cannot work properly without such 25 MHz fixed timer as
+ * doing otherwise leads to using a clocksource whose frequency varies
+ * when doing cpufreq frequency changes.
+ *
+ * See Documentation/devicetree/bindings/timer/marvell,armada-370-xp-timer.txt
*/
#include <linux/init.h>
@@ -212,7 +225,7 @@ static struct local_timer_ops armada_370
.stop = armada_370_xp_timer_stop,
};
-static void __init armada_370_xp_timer_init(struct device_node *np)
+static void __init armada_370_xp_timer_common_init(struct device_node *np)
{
u32 clr = 0, set = 0;
int res;
@@ -221,20 +234,10 @@ static void __init armada_370_xp_timer_i
WARN_ON(!timer_base);
local_base = of_iomap(np, 1);
- if (of_find_property(np, "marvell,timer-25Mhz", NULL)) {
- /* The fixed 25MHz timer is available so let's use it */
+ if (timer25Mhz)
set = TIMER0_25MHZ;
- timer_clk = 25000000;
- } else {
- unsigned long rate = 0;
- struct clk *clk = of_clk_get(np, 0);
- WARN_ON(IS_ERR(clk));
- rate = clk_get_rate(clk);
- timer_clk = rate / TIMER_DIVIDER;
-
+ else
clr = TIMER0_25MHZ;
- timer25Mhz = false;
- }
timer_ctrl_clrset(clr, set);
local_timer_ctrl_clrset(clr, set);
@@ -288,5 +291,26 @@ static void __init armada_370_xp_timer_i
#endif
}
}
-CLOCKSOURCE_OF_DECLARE(armada_370_xp, "marvell,armada-370-xp-timer",
- armada_370_xp_timer_init);
+
+static void __init armada_xp_timer_init(struct device_node *np)
+{
+ /* The fixed 25MHz timer is required, timer25Mhz is true by default */
+ timer_clk = 25000000;
+
+ armada_370_xp_timer_common_init(np);
+}
+CLOCKSOURCE_OF_DECLARE(armada_xp, "marvell,armada-xp-timer",
+ armada_xp_timer_init);
+
+static void __init armada_370_timer_init(struct device_node *np)
+{
+ struct clk *clk = of_clk_get(np, 0);
+
+ WARN_ON(IS_ERR(clk));
+ timer_clk = clk_get_rate(clk) / TIMER_DIVIDER;
+ timer25Mhz = false;
+
+ armada_370_xp_timer_common_init(np);
+}
+CLOCKSOURCE_OF_DECLARE(armada_370, "marvell,armada-370-timer",
+ armada_370_timer_init);
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