diff options
Diffstat (limited to 'arch/arm/include/asm')
| -rw-r--r-- | arch/arm/include/asm/arch-rockchip/clock.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/arm/include/asm/arch-rockchip/clock.h b/arch/arm/include/asm/arch-rockchip/clock.h index 2e5ba86..8a0376c 100644 --- a/arch/arm/include/asm/arch-rockchip/clock.h +++ b/arch/arm/include/asm/arch-rockchip/clock.h @@ -36,6 +36,26 @@ static inline int rk_pll_id(enum rk_clk_id clk_id) } /** + * clk_get_divisor() - Calculate the required clock divisior + * + * Given an input rate and a required output_rate, calculate the Rockchip + * divisor needed to achieve this. + * + * @input_rate: Input clock rate in Hz + * @output_rate: Output clock rate in Hz + * @return divisor register value to use + */ +static inline u32 clk_get_divisor(ulong input_rate, uint output_rate) +{ + uint clk_div; + + clk_div = input_rate / output_rate; + clk_div = (clk_div + 1) & 0xfffe; + + return clk_div; +} + +/** * rockchip_get_cru() - get a pointer to the clock/reset unit registers * * @return pointer to registers, or -ve error on error |