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>

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 f455182b108653b058564c517f72d6bf4d4d83f8..e9c78ce880e600c3413a4d96f5cc39d72f4d59ff 100644 (file)
--- 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 d8555f9edc509ce9f203c1c517959a6fe6e33159..3a0704b0d7398110ba13a7fd7c37fb75a25fffb6 100644 (file)
--- 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);