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boards: stm32: nucleo_f429zi: Configure clocks using dt

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Configure clock for these two boards using device tree.

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
This commit is contained in:
Erwan Gouriou 2021-04-07 17:10:14 +02:00 committed by Carles Cufí
parent a7989f64a3
commit 2f42f51bd8
2 changed files with 24 additions and 19 deletions
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24
boards/arm/nucleo_f429zi/nucleo_f429zi.dts
View file

@ -54,6 +54,30 @@
};
};
&clk_hse {
hse-bypass;
clock-frequency = <DT_FREQ_M(8)>; /* STLink 8MHz clock */
status = "okay";
};
&pll {
div-m = <8>;
mul-n = <336>;
div-p = <2>;
div-q = <7>;
clocks = <&clk_hse>;
status = "okay";
};
&rcc {
clocks = <&pll>;
clock-frequency = <DT_FREQ_M(168)>; /* highest value to get a precise USB clock */
ahb-prescaler = <1>;
apb1-prescaler = <4>;
apb2-prescaler = <2>;
};
&adc1 {
pinctrl-0 = <&adc1_in0_pa0>;
status = "okay";

19
boards/arm/nucleo_f429zi/nucleo_f429zi_defconfig
View file

@ -2,8 +2,6 @@
CONFIG_SOC_SERIES_STM32F4X=y
CONFIG_SOC_STM32F429XX=y
# 168MHz system clock (highest value to get a precise USB clock)
CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=168000000
# Enable MPU
CONFIG_ARM_MPU=y
@ -25,20 +23,3 @@ CONFIG_GPIO=y
# clock configuration
CONFIG_CLOCK_CONTROL=y
# Clock configuration for Cube Clock control driver
CONFIG_CLOCK_STM32_HSE_CLOCK=8000000
CONFIG_CLOCK_STM32_SYSCLK_SRC_PLL=y
# use HSE as PLL input
CONFIG_CLOCK_STM32_PLL_SRC_HSE=y
# however, the board does not have an external oscillator, so just use
# the 8MHz clock signal coming from integrated STLink
CONFIG_CLOCK_STM32_HSE_BYPASS=y
# produce 168MHz clock at PLL output
CONFIG_CLOCK_STM32_PLL_M_DIVISOR=8
CONFIG_CLOCK_STM32_PLL_N_MULTIPLIER=336
CONFIG_CLOCK_STM32_PLL_P_DIVISOR=2
CONFIG_CLOCK_STM32_PLL_Q_DIVISOR=7
CONFIG_CLOCK_STM32_AHB_PRESCALER=1
CONFIG_CLOCK_STM32_APB1_PRESCALER=4
CONFIG_CLOCK_STM32_APB2_PRESCALER=2