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boards: nucleo_g474re: Use dts for clocks configuration

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Convert board to use of device tree for clocks configuration.

Signed-off-by: Alexandre Bourdiol <alexandre.bourdiol@st.com>
This commit is contained in:
Alexandre Bourdiol 2021-04-29 15:11:59 +02:00 • committed by Anas Nashif
commit 8737587f2c
2 changed files with 24 additions and 35 deletions
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23
boards/arm/nucleo_g474re/nucleo_g474re.dts
View file

@ -51,6 +51,29 @@
};
};
&clk_hse {
clock-frequency = <DT_FREQ_M(24)>;
status = "okay";
};
&pll {
div-m = <6>;
mul-n = <85>;
div-p = <7>;
div-q = <2>;
div-r = <2>;
clocks = <&clk_hse>;
status = "okay";
};
&rcc {
clocks = <&pll>;
clock-frequency = <DT_FREQ_M(170)>;
ahb-prescaler = <1>;
apb1-prescaler = <1>;
apb2-prescaler = <1>;
};
&usart1 {
pinctrl-0 = <&usart1_tx_pc4 &usart1_rx_pc5>;
current-speed = <115200>;

36
boards/arm/nucleo_g474re/nucleo_g474re_defconfig
View file

@ -3,14 +3,6 @@
CONFIG_SOC_SERIES_STM32G4X=y
CONFIG_SOC_STM32G474XX=y
# 170MHz system clock only in 'boost power' mode.
# RM0440, section 5.1.5 states that the R1MODE bit
# must be cleared before system can be 170MHz.
CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=170000000
# 150MHz system clock in 'normal power' mode
# CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=150000000
# enable uart driver
CONFIG_SERIAL=y
@ -20,35 +12,9 @@ CONFIG_PINMUX=y
# enable GPIO
CONFIG_GPIO=y
# clock configuration
# Enable Clocks
CONFIG_CLOCK_CONTROL=y
# Use PLLCLK for SYSCLK
CONFIG_CLOCK_STM32_SYSCLK_SRC_PLL=y
# Use HSE (24MHz) to feed into PLL
CONFIG_CLOCK_STM32_PLL_SRC_HSE=y
CONFIG_CLOCK_STM32_HSE_CLOCK=24000000
CONFIG_CLOCK_STM32_PLL_P_DIVISOR=7
CONFIG_CLOCK_STM32_PLL_Q_DIVISOR=2
CONFIG_CLOCK_STM32_PLL_R_DIVISOR=2
# Produce 150MHz clock at PLLCLK output
# CONFIG_CLOCK_STM32_PLL_M_DIVISOR=4
# CONFIG_CLOCK_STM32_PLL_N_MULTIPLIER=75
# Produce 170MHz clock at PLLCLK output
CONFIG_CLOCK_STM32_PLL_M_DIVISOR=6
CONFIG_CLOCK_STM32_PLL_N_MULTIPLIER=85
# Produce Max (150MHz or 170MHz) HCLK
CONFIG_CLOCK_STM32_AHB_PRESCALER=1
# Produce Max (150MHz or 170MHz) APB1 clocks and APB2 clocks
CONFIG_CLOCK_STM32_APB1_PRESCALER=1
CONFIG_CLOCK_STM32_APB2_PRESCALER=1
# Console
CONFIG_CONSOLE=y
CONFIG_UART_CONSOLE=y