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driver: clock: stm32: boost voltage when clock exceeds 80MHz

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This patch activates the boost mode for the main regulator
when the system frequency above 80MHz for stm32l4Rx/stm32l4Sx
soc series.
To save power, the boost mode should be disabled below 80MHz.

Signed-off-by: Francois Ramu <francois.ramu@st.com>
This commit is contained in:
Francois Ramu 2020-02-26 09:07:02 +01:00 committed by Maureen Helm
parent 5c0687e58b
commit f41ff24a3a
1 changed files with 6 additions and 0 deletions
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6
drivers/clock_control/clock_stm32l4_wb.c
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@ -30,6 +30,12 @@ void config_pll_init(LL_UTILS_PLLInitTypeDef *pllinit)
pllinit->PLLM = pllm(CONFIG_CLOCK_STM32_PLL_M_DIVISOR);
pllinit->PLLN = CONFIG_CLOCK_STM32_PLL_N_MULTIPLIER;
pllinit->PLLR = pllr(CONFIG_CLOCK_STM32_PLL_R_DIVISOR);
#ifdef PWR_CR5_R1MODE
/* set power boost mode for sys clock greater than 80MHz */
if (sys_clock_hw_cycles_per_sec() >= MHZ(80)) {
LL_PWR_EnableRange1BoostMode();
}
#endif /* PWR_CR5_R1MODE */
}
#endif /* CONFIG_CLOCK_STM32_SYSCLK_SRC_PLL */