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authorEzequiel Garcia <ezequiel.garcia@free-electrons.com>2014-11-04 10:21:33 -0300
committerDaniel Lezcano <daniel.lezcano@linaro.org>2014-11-26 13:51:08 +0100
commit4a22d9c93af1f2b2c40354c4bc59fd007f33f05e (patch)
tree490a796cf43f6e08c474ff71df8023a47603f2ec
parent8067042ad9543b410b7dc355ec312c2b61979eec (diff)
clocksource: armada-370-xp: Use the reference clock on A375 SoC
The 25 MHz reference clock has better stability so its use is preferred over the core clock. This commit takes advantage of the already introduced Armada 375 devicetree compatible string and adds a new timer initialization. If available, the timer will use the reference clock (named as 'fixed'). Otherwise, it falls back to the previous behavior. Acked-by: Jason Cooper <jason@lakedaemon.net> Acked-by: Gregory CLEMENT <gregory.clement@free-electrons.com> Acked-by: Wim Van Sebroeck <wim@iguana.be> Reviewed-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Tested-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
-rw-r--r--Documentation/devicetree/bindings/timer/marvell,armada-370-xp-timer.txt9
-rw-r--r--drivers/clocksource/time-armada-370-xp.c28
2 files changed, 34 insertions, 3 deletions
diff --git a/Documentation/devicetree/bindings/timer/marvell,armada-370-xp-timer.txt b/Documentation/devicetree/bindings/timer/marvell,armada-370-xp-timer.txt
index f455182b1086..e9c78ce880e6 100644
--- a/Documentation/devicetree/bindings/timer/marvell,armada-370-xp-timer.txt
+++ b/Documentation/devicetree/bindings/timer/marvell,armada-370-xp-timer.txt
@@ -2,8 +2,10 @@ Marvell Armada 370 and Armada XP Timers
---------------------------------------
Required properties:
-- compatible: Should be either "marvell,armada-370-timer" or
- "marvell,armada-xp-timer" as appropriate.
+- compatible: Should be one of the following
+ "marvell,armada-370-timer",
+ "marvell,armada-375-timer",
+ "marvell,armada-xp-timer".
- interrupts: Should contain the list of Global Timer interrupts and
then local timer interrupts
- reg: Should contain location and length for timers register. First
@@ -13,7 +15,8 @@ Required properties:
Clocks required for compatible = "marvell,armada-370-timer":
- clocks : Must contain a single entry describing the clock input
-Clocks required for compatible = "marvell,armada-xp-timer":
+Clocks required for compatibles = "marvell,armada-xp-timer",
+ "marvell,armada-375-timer":
- clocks : Must contain an entry for each entry in clock-names.
- clock-names : Must include the following entries:
"nbclk" (L2/coherency fabric clock),
diff --git a/drivers/clocksource/time-armada-370-xp.c b/drivers/clocksource/time-armada-370-xp.c
index d8555f9edc50..3a0704b0d739 100644
--- a/drivers/clocksource/time-armada-370-xp.c
+++ b/drivers/clocksource/time-armada-370-xp.c
@@ -301,6 +301,34 @@ static void __init armada_xp_timer_init(struct device_node *np)
CLOCKSOURCE_OF_DECLARE(armada_xp, "marvell,armada-xp-timer",
armada_xp_timer_init);
+static void __init armada_375_timer_init(struct device_node *np)
+{
+ struct clk *clk;
+
+ clk = of_clk_get_by_name(np, "fixed");
+ if (!IS_ERR(clk)) {
+ clk_prepare_enable(clk);
+ timer_clk = clk_get_rate(clk);
+ } else {
+
+ /*
+ * This fallback is required in order to retain proper
+ * devicetree backwards compatibility.
+ */
+ clk = of_clk_get(np, 0);
+
+ /* Must have at least a clock */
+ BUG_ON(IS_ERR(clk));
+ clk_prepare_enable(clk);
+ timer_clk = clk_get_rate(clk) / TIMER_DIVIDER;
+ timer25Mhz = false;
+ }
+
+ armada_370_xp_timer_common_init(np);
+}
+CLOCKSOURCE_OF_DECLARE(armada_375, "marvell,armada-375-timer",
+ armada_375_timer_init);
+
static void __init armada_370_timer_init(struct device_node *np)
{
struct clk *clk = of_clk_get(np, 0);

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