Commit 4d594dd3 authored by Yuvaraj Kumar C D's avatar Yuvaraj Kumar C D Committed by Olof Johansson

ARM: exynos: dts: Update 5250 arch timer node with clock frequency

Without the "clock-frequency" property in arch timer node, could able
to see the below crash dump.

[<c0014e28>] (unwind_backtrace+0x0/0xf4) from [<c0011808>] (show_stack+0x10/0x14)
[<c0011808>] (show_stack+0x10/0x14) from [<c036ac1c>] (dump_stack+0x7c/0xb0)
[<c036ac1c>] (dump_stack+0x7c/0xb0) from [<c01ab760>] (Ldiv0_64+0x8/0x18)
[<c01ab760>] (Ldiv0_64+0x8/0x18) from [<c0062f60>] (clockevents_config.part.2+0x1c/0x74)
[<c0062f60>] (clockevents_config.part.2+0x1c/0x74) from [<c0062fd8>] (clockevents_config_and_register+0x20/0x2c)
[<c0062fd8>] (clockevents_config_and_register+0x20/0x2c) from [<c02b8e8c>] (arch_timer_setup+0xa8/0x134)
[<c02b8e8c>] (arch_timer_setup+0xa8/0x134) from [<c04b47b4>] (arch_timer_init+0x1f4/0x24c)
[<c04b47b4>] (arch_timer_init+0x1f4/0x24c) from [<c04b40d8>] (clocksource_of_init+0x34/0x58)
[<c04b40d8>] (clocksource_of_init+0x34/0x58) from [<c049ed8c>] (time_init+0x20/0x2c)
[<c049ed8c>] (time_init+0x20/0x2c) from [<c049b95c>] (start_kernel+0x1e0/0x39c)

THis is because the Exynos u-boot, for example on the Chromebooks, doesn't set
up the CNTFRQ register as expected by arch_timer. Instead, we have to specify
the frequency in the device tree like this.
Signed-off-by: default avatarYuvaraj Kumar C D <yuvaraj.cd@samsung.com>
[olof: Changed subject, added comment, elaborated on commit message]
Signed-off-by: default avatarOlof Johansson <olof@lixom.net>
parent 98ead6e0
...@@ -96,6 +96,11 @@ timer { ...@@ -96,6 +96,11 @@ timer {
<1 14 0xf08>, <1 14 0xf08>,
<1 11 0xf08>, <1 11 0xf08>,
<1 10 0xf08>; <1 10 0xf08>;
/* Unfortunately we need this since some versions of U-Boot
* on Exynos don't set the CNTFRQ register, so we need the
* value from DT.
*/
clock-frequency = <24000000>;
}; };
mct@101C0000 { mct@101C0000 {
......
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