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clocksource: armada-370-xp: Introduce new compatibles

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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>
This commit is contained in:
Ezequiel Garcia 2013-08-13 11:43:13 -03:00 committed by Daniel Lezcano
parent 573145f08c
commit 7cd6392c9b
1 changed files with 39 additions and 15 deletions
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54
drivers/clocksource/time-armada-370-xp.c
View file

@ -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_xp_local_timer_ops = {
.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_init(struct device_node *np)
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_init(struct device_node *np)
#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);