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boards: nucleo_f746zg: Use dts for clocks configuration

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Convert board to use of device tree for clocks configuration.

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
This commit is contained in:
Erwan Gouriou 2021-04-15 15:44:48 +02:00 • committed by Carles Cufí
commit b095d6ce76
2 changed files with 24 additions and 21 deletions
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23
boards/arm/nucleo_f746zg/nucleo_f746zg.dts
View file

@ -61,6 +61,29 @@
};
};
&clk_hse {
hse-bypass;
clock-frequency = <DT_FREQ_M(8)>; /* STLink 8MHz clock */
status = "okay";
};
&pll {
div-m = <4>;
mul-n = <72>;
div-p = <2>;
div-q = <3>;
clocks = <&clk_hse>;
status = "okay";
};
&rcc {
clocks = <&pll>;
clock-frequency = <DT_FREQ_M(72)>;
ahb-prescaler = <1>;
apb1-prescaler = <2>;
apb2-prescaler = <1>;
};
&usart2 {
pinctrl-0 = <&usart2_tx_pd5 &usart2_rx_pd6
&usart2_rts_pd4 &usart2_cts_pd3>;

22
boards/arm/nucleo_f746zg/nucleo_f746zg_defconfig
View file

@ -2,8 +2,6 @@
CONFIG_SOC_SERIES_STM32F7X=y
CONFIG_SOC_STM32F746XX=y
# 72MHz system clock (CubeMX Defaults)
CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=72000000
# Enable MPU
CONFIG_ARM_MPU=y
@ -24,23 +22,5 @@ CONFIG_PINMUX=y
# Enable GPIO
CONFIG_GPIO=y
# Clock Configuration
# Enable Clocks
CONFIG_CLOCK_CONTROL=y
# STLINK provides 8MHz clock input
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
# Nucleo-144 boards do not have an external oscillator, so just use
# the 8MHz clock signal coming from integrated STLink
CONFIG_CLOCK_STM32_HSE_BYPASS=y
# Produce 72MHz clock at PLL output
CONFIG_CLOCK_STM32_PLL_M_DIVISOR=4
CONFIG_CLOCK_STM32_PLL_N_MULTIPLIER=72
CONFIG_CLOCK_STM32_PLL_P_DIVISOR=2
CONFIG_CLOCK_STM32_PLL_Q_DIVISOR=3
CONFIG_CLOCK_STM32_AHB_PRESCALER=1
CONFIG_CLOCK_STM32_APB1_PRESCALER=2
CONFIG_CLOCK_STM32_APB2_PRESCALER=1