ARM: 6145/1: ux500 MTU clockrate correction

This adjusts the clockrate for the MTU timer. On the different
UX500 variants this rate is different. The platform can also have
been set up at hardware initialization, bootloader or early init
for different clock speeds. To have the clock framework available
early so the timers can use them, the clock initialization for
Nomadik and ux500 is moved to IRQ init time. A custom per-clock
callback is added to handle special cases like this.

This solves a user-visible bug: without this patch the current
UX500 platforms will not be synchronized to wall-clock time and
the platform will drift in time.

Acked-by: Rabin Vincent <rabin.vincent@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 7 insertions, 4 deletions

diff --git a/arch/arm/mach-nomadik/clock.c b/arch/arm/mach-nomadik/clock.c
index 2c471fc451d7..f035f4185274 100644
--- a/arch/arm/mach-nomadik/clock.c
+++ b/arch/arm/mach-nomadik/clock.c
@@ -32,7 +32,10 @@ void clk_disable(struct clk *clk)
 }
 EXPORT_SYMBOL(clk_disable);
 
-/* We have a fixed clock alone, for now */
+static struct clk clk_24 = {
+	.rate = 2400000,
+};
+
 static struct clk clk_48 = {
 	.rate = 48 * 1000 * 1000,
 };
@@ -50,6 +53,8 @@ static struct clk clk_default;
 	}
 
 static struct clk_lookup lookups[] = {
+	CLK(&clk_24, "mtu0"),
+	CLK(&clk_24, "mtu1"),
 	CLK(&clk_48, "uart0"),
 	CLK(&clk_48, "uart1"),
 	CLK(&clk_default, "gpio.0"),
@@ -59,10 +64,8 @@ static struct clk_lookup lookups[] = {
 	CLK(&clk_default, "rng"),
 };
 
-static int __init clk_init(void)
+int __init clk_init(void)
 {
 	clkdev_add_table(lookups, ARRAY_SIZE(lookups));
 	return 0;
 }
-
-arch_initcall(clk_init);