SoCs of mtmips can use different CPU frequencies depending on the HW/SW configurations. For example mt7628 uses 580MHz clock if the input xtal frequency is 40MHz, and 575MHz clock if the xtal is 25MHz. Upon cold boot the CPU uses the xtal frequency directly.

So hardcoding the timer frequency (half of the CPU frequency) in CONFIG_SYS_MIPS_TIMER_FREQ is not a good idea for this case.

This patch adds a mtmips-specific field timer_freq to arch_global_data. This field will be used later in mtmips-specific get_tbclk() to provide accurate timer frequency in different boot stage.

Signed-off-by: Weijie Gao weijie.gao@mediatek.com --- Changes since v1: splitted from another patch. --- arch/mips/include/asm/global_data.h | 3 +++ 1 file changed, 3 insertions(+)

diff --git a/arch/mips/include/asm/global_data.h b/arch/mips/include/asm/global_data.h index 7b4ad083ba..4c30fab871 100644 --- a/arch/mips/include/asm/global_data.h +++ b/arch/mips/include/asm/global_data.h @@ -27,6 +27,9 @@ struct arch_global_data { #ifdef CONFIG_MIPS_L2_CACHE unsigned short l2_line_size; #endif +#ifdef CONFIG_ARCH_MTMIPS + unsigned long timer_freq; +#endif };

#include <asm-generic/global_data.h>