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