esp-idf/components/soc/esp32/include/soc/clk_tree_defs.h

/*
 * SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
 *
 * SPDX-License-Identifier: Apache-2.0
 */
#pragma once

#ifdef __cplusplus
extern "C" {
#endif

/*
 ************************* ESP32 Root Clock Source ****************************
 * 1) Internal 8MHz RC Oscillator: RC_FAST (usually referred as FOSC or CK8M/CLK8M in TRM and reg. description)
 *
 *    This RC oscillator generates a ~8.5MHz clock signal output as the RC_FAST_CLK.
 *    The ~8.5MHz signal output is also passed into a configurable divider, which by default divides the input clock
 *    frequency by 256, to generate a RC_FAST_D256_CLK (usually referred as 8md256 or simply d256 in reg. description).
 *
 *    The exact frequency of RC_FAST_CLK can be computed in runtime through calibration on the RC_FAST_D256_CLK.
 *
 * 2) External 2~40MHz Crystal Clock: XTAL
 *
 * 3) Internal 150kHz RC Oscillator: RC_SLOW (usually referrred as RTC in TRM or reg. description)
 *
 *    This RC oscillator generates a ~150kHz clock signal output as the RC_SLOW_CLK. The exact frequency of this clock
 *    can be computed in runtime through calibration.
 *
 * 4) External 32kHz Crystal Clock (optional): XTAL32K
 *
 *    The clock source for this XTAL32K_CLK can be either a 32kHz crystal connecting to the 32K_XP and 32K_XN pins
 *    or a 32kHz clock signal generated by an external circuit. The external signal must be connected to the 32K_XN pin.
 *    Additionally, a 1nF capacitor must be placed between the 32K_XP pin and ground. In this case, the 32K_XP pin
 *    cannot be used as a GPIO pin.
 *
 *    XTAL32K_CLK can also be calibrated to get its exact frequency.
 */

/* With the default value of CK8M_DFREQ = 172, RC_FAST clock frequency is 8.5 MHz +/- 7% */
#define SOC_CLK_RC_FAST_FREQ_APPROX         8500000                             /*!< Approximate RC_FAST_CLK frequency in Hz */
/* With the default value of DCAP, range is +/- 5% */
#define SOC_CLK_RC_SLOW_FREQ_APPROX         150000                              /*!< Approximate RC_SLOW_CLK frequency in Hz */
#define SOC_CLK_RC_FAST_D256_FREQ_APPROX    (SOC_CLK_RC_FAST_FREQ_APPROX / 256) /*!< Approximate RC_FAST_D256_CLK frequency in Hz */
#define SOC_CLK_XTAL32K_FREQ_APPROX         32768                               /*!< Approximate XTAL32K_CLK frequency in Hz */

// Naming convention: SOC_ROOT_CLK_{loc}_{type}_[attr]
// {loc}: EXT, INT
// {type}: XTAL, RC
// [attr] - optional: [frequency], FAST, SLOW
/**
 * @brief Root clock
 */
typedef enum {
    SOC_ROOT_CLK_INT_RC_FAST,          /*!< Internal 8MHz RC oscillator */
    SOC_ROOT_CLK_INT_RC_SLOW,          /*!< Internal 150kHz RC oscillator */
    SOC_ROOT_CLK_EXT_XTAL,             /*!< External 2~40MHz crystal */
    SOC_ROOT_CLK_EXT_XTAL32K,          /*!< External 32kHz crystal/clock signal */
} soc_root_clk_t;

/**
 * @brief CPU_CLK mux inputs, which are the supported clock sources for the CPU_CLK
 * @note Enum values are matched with the register field values on purpose
 */
typedef enum {
    SOC_CPU_CLK_SRC_XTAL = 0,              /*!< Select XTAL_CLK as CPU_CLK source */
    SOC_CPU_CLK_SRC_PLL = 1,               /*!< Select PLL_CLK as CPU_CLK source (PLL_CLK is the output of 40MHz crystal oscillator frequency multiplier, can be 480MHz or 320MHz) */
    SOC_CPU_CLK_SRC_RC_FAST = 2,           /*!< Select RC_FAST_CLK as CPU_CLK source */
    SOC_CPU_CLK_SRC_APLL = 3,              /*!< Select APLL_CLK as CPU_CLK source */
    SOC_CPU_CLK_SRC_INVALID,               /*!< Invalid CPU_CLK source */
} soc_cpu_clk_src_t;

/**
 * @brief RTC_SLOW_CLK mux inputs, which are the supported clock sources for the RTC_SLOW_CLK
 * @note Enum values are matched with the register field values on purpose
 */
typedef enum {
    SOC_RTC_SLOW_CLK_SRC_RC_SLOW = 0,      /*!< Select RC_SLOW_CLK as RTC_SLOW_CLK source */
    SOC_RTC_SLOW_CLK_SRC_XTAL32K = 1,      /*!< Select XTAL32K_CLK as RTC_SLOW_CLK source */
    SOC_RTC_SLOW_CLK_SRC_RC_FAST_D256 = 2, /*!< Select RC_FAST_D256_CLK (referred as FOSC_DIV or 8m_d256/8md256 in TRM and reg. description) as RTC_SLOW_CLK source */
    SOC_RTC_SLOW_CLK_SRC_INVALID,          /*!< Invalid RTC_SLOW_CLK source */
} soc_rtc_slow_clk_src_t;

/**
 * @brief RTC_FAST_CLK mux inputs, which are the supported clock sources for the RTC_FAST_CLK
 * @note Enum values are matched with the register field values on purpose
 */
typedef enum {
    SOC_RTC_FAST_CLK_SRC_XTAL_D4 = 0,      /*!< Select XTAL_D4_CLK (may referred as XTAL_CLK_DIV_4) as RTC_FAST_CLK source */
    SOC_RTC_FAST_CLK_SRC_XTAL_DIV = SOC_RTC_FAST_CLK_SRC_XTAL_D4, /*!< Alias name for `SOC_RTC_FAST_CLK_SRC_XTAL_D4` */
    SOC_RTC_FAST_CLK_SRC_RC_FAST = 1,      /*!< Select RC_FAST_CLK as RTC_FAST_CLK source */
    SOC_RTC_FAST_CLK_SRC_INVALID,          /*!< Invalid RTC_FAST_CLK source */
} soc_rtc_fast_clk_src_t;

// Naming convention: SOC_MOD_CLK_{[upstream]clock_name}_[attr]
// {[upstream]clock_name}: APB, APLL, (BB)PLL, etc.
// [attr] - optional: FAST, SLOW, D<divider>, F<freq>
/**
 * @brief Supported clock sources for modules (CPU, peripherals, RTC, etc.)
 *
 * @note enum starts from 1, to save 0 for special purpose
 */
typedef enum {
    // For CPU domain
    SOC_MOD_CLK_CPU = 1,                       /*!< CPU_CLK can be sourced from XTAL, PLL, RC_FAST, or APLL by configuring soc_cpu_clk_src_t */
    // For RTC domain
    SOC_MOD_CLK_RTC_FAST,                      /*!< RTC_FAST_CLK can be sourced from XTAL_D4 or RC_FAST by configuring soc_rtc_fast_clk_src_t */
    SOC_MOD_CLK_RTC_SLOW,                      /*!< RTC_SLOW_CLK can be sourced from RC_SLOW, XTAL32K, or RC_FAST_D256 by configuring soc_rtc_slow_clk_src_t */
    // For digital domain: peripherals, WIFI, BLE
    SOC_MOD_CLK_APB,                           /*!< APB_CLK is highly dependent on the CPU_CLK source */
    SOC_MOD_CLK_PLL_D2,                        /*!< PLL_D2_CLK is derived from PLL, it has a fixed divider of 2 */
    SOC_MOD_CLK_PLL_F160M,                     /*!< PLL_F160M_CLK is derived from PLL, and has a fixed frequency of 160MHz */
    SOC_MOD_CLK_XTAL32K,                       /*!< XTAL32K_CLK comes from the external 32kHz crystal, passing a clock gating to the peripherals */
    SOC_MOD_CLK_RC_FAST,                       /*!< RC_FAST_CLK comes from the internal 8MHz rc oscillator, passing a clock gating to the peripherals */
    SOC_MOD_CLK_RC_FAST_D256,                  /*!< RC_FAST_D256_CLK comes from the internal 8MHz rc oscillator, divided by 256, and passing a clock gating to the peripherals */
    SOC_MOD_CLK_XTAL,                          /*!< XTAL_CLK comes from the external crystal (2~40MHz) */
    SOC_MOD_CLK_REF_TICK,                      /*!< REF_TICK is derived from APB, it has a fixed frequency of 1MHz even when APB frequency changes */
    SOC_MOD_CLK_APLL,                          /*!< APLL is sourced from PLL, and its frequency is configurable through APLL configuration registers */
    SOC_MOD_CLK_INVALID,                       /*!< Indication of the end of the available module clock sources */
} soc_module_clk_t;

//////////////////////////////////////////////////SYSTIMER///////////////////////////////////////////////////////////////

/**
 * @brief Type of SYSTIMER clock source
 */
typedef enum {
    SYSTIMER_CLK_SRC_XTAL = SOC_MOD_CLK_XTAL,       /*!< SYSTIMER source clock is XTAL */
    SYSTIMER_CLK_SRC_DEFAULT = SOC_MOD_CLK_XTAL,    /*!< SYSTIMER source clock default choice is XTAL */
} soc_periph_systimer_clk_src_t;

//////////////////////////////////////////////////GPTimer///////////////////////////////////////////////////////////////

/**
 * @brief Array initializer for all supported clock sources of GPTimer
 *
 * The following code can be used to iterate all possible clocks:
 * @code{c}
 * soc_periph_gptimer_clk_src_t gptimer_clks[] = (soc_periph_gptimer_clk_src_t)SOC_GPTIMER_CLKS;
 * for (size_t i = 0; i< sizeof(gptimer_clks) / sizeof(gptimer_clks[0]); i++) {
 *     soc_periph_gptimer_clk_src_t clk = gptimer_clks[i];
 *     // Test GPTimer with the clock `clk`
 * }
 * @endcode
 */
#define SOC_GPTIMER_CLKS {SOC_MOD_CLK_APB}

/**
 * @brief Type of GPTimer clock source
 */
typedef enum {
    GPTIMER_CLK_SRC_APB = SOC_MOD_CLK_APB,     /*!< Select APB as the source clock */
    GPTIMER_CLK_SRC_DEFAULT = SOC_MOD_CLK_APB, /*!< Select APB as the default choice */
} soc_periph_gptimer_clk_src_t;

/**
 * @brief Type of Timer Group clock source, reserved for the legacy timer group driver
 */
typedef enum {
    TIMER_SRC_CLK_APB = SOC_MOD_CLK_APB,     /*!< Timer group source clock is APB */
    TIMER_SRC_CLK_DEFAULT = SOC_MOD_CLK_APB, /*!< Timer group source clock default choice is APB */
} soc_periph_tg_clk_src_legacy_t;

//////////////////////////////////////////////////LCD///////////////////////////////////////////////////////////////////

/**
 * @brief Array initializer for all supported clock sources of LCD
 */
#define SOC_LCD_CLKS {SOC_MOD_CLK_PLL_F160M}

/**
 * @brief Type of LCD clock source
 */
typedef enum {
    LCD_CLK_SRC_PLL160M = SOC_MOD_CLK_PLL_F160M, /*!< Select PLL_160M as the source clock */
    LCD_CLK_SRC_DEFAULT = SOC_MOD_CLK_PLL_F160M, /*!< Select PLL_160M as the default choice */
} soc_periph_lcd_clk_src_t;

//////////////////////////////////////////////////RMT///////////////////////////////////////////////////////////////////

/**
 * @brief Array initializer for all supported clock sources of RMT
 */
#define SOC_RMT_CLKS {SOC_MOD_CLK_APB, SOC_MOD_CLK_REF_TICK}

/**
 * @brief Type of RMT clock source
 */
typedef enum {
    RMT_CLK_SRC_APB = SOC_MOD_CLK_APB,           /*!< Select APB as the source clock */
    RMT_CLK_SRC_REF_TICK = SOC_MOD_CLK_REF_TICK, /*!< Select REF_TICK as the source clock */
    RMT_CLK_SRC_DEFAULT = SOC_MOD_CLK_APB,       /*!< Select APB as the default choice */
} soc_periph_rmt_clk_src_t;

/**
 * @brief Type of RMT clock source, reserved for the legacy RMT driver
 */
typedef enum {
    RMT_BASECLK_APB = SOC_MOD_CLK_APB,      /*!< RMT source clock is APB CLK */
    RMT_BASECLK_REF = SOC_MOD_CLK_REF_TICK, /*!< RMT source clock is REF_TICK */
    RMT_BASECLK_DEFAULT = SOC_MOD_CLK_APB,  /*!< RMT source clock default choice is APB */
} soc_periph_rmt_clk_src_legacy_t;

///////////////////////////////////////////////////UART/////////////////////////////////////////////////////////////////

/**
 * @brief Type of UART clock source, reserved for the legacy UART driver
 */
typedef enum {
    UART_SCLK_APB = SOC_MOD_CLK_APB,           /*!< UART source clock is APB CLK */
    UART_SCLK_REF_TICK = SOC_MOD_CLK_REF_TICK, /*!< UART source clock is REF_TICK */
    UART_SCLK_DEFAULT = SOC_MOD_CLK_APB,       /*!< UART source clock default choice is APB */
} soc_periph_uart_clk_src_legacy_t;

//////////////////////////////////////////////////MCPWM/////////////////////////////////////////////////////////////////

/**
 * @brief Array initializer for all supported clock sources of MCPWM Timer
 */
#define SOC_MCPWM_TIMER_CLKS {SOC_MOD_CLK_PLL_F160M}

/**
 * @brief Type of MCPWM timer clock source
 */
typedef enum {
    MCPWM_TIMER_CLK_SRC_PLL160M = SOC_MOD_CLK_PLL_F160M, /*!< Select PLL_F160M as the source clock */
    MCPWM_TIMER_CLK_SRC_DEFAULT = SOC_MOD_CLK_PLL_F160M, /*!< Select PLL_F160M as the default clock choice */
} soc_periph_mcpwm_timer_clk_src_t;

/**
 * @brief Array initializer for all supported clock sources of MCPWM Capture Timer
 */
#define SOC_MCPWM_CAPTURE_CLKS {SOC_MOD_CLK_APB}

/**
 * @brief Type of MCPWM capture clock source
 */
typedef enum {
    MCPWM_CAPTURE_CLK_SRC_APB = SOC_MOD_CLK_APB,     /*!< Select APB as the source clock */
    MCPWM_CAPTURE_CLK_SRC_DEFAULT = SOC_MOD_CLK_APB, /*!< Select APB as the default clock choice */
} soc_periph_mcpwm_capture_clk_src_t;

/**
 * @brief Array initializer for all supported clock sources of MCPWM Carrier
 */
#define SOC_MCPWM_CARRIER_CLKS {SOC_MOD_CLK_PLL_F160M}

/**
 * @brief Type of MCPWM carrier clock source
 */
typedef enum {
    MCPWM_CARRIER_CLK_SRC_PLL160M = SOC_MOD_CLK_PLL_F160M, /*!< Select PLL_F160M as the source clock */
    MCPWM_CARRIER_CLK_SRC_DEFAULT = SOC_MOD_CLK_PLL_F160M, /*!< Select PLL_F160M as the default clock choice */
} soc_periph_mcpwm_carrier_clk_src_t;

///////////////////////////////////////////////////I2S//////////////////////////////////////////////////////////////////
/**
 * @brief Array initializer for all supported clock sources of I2S
 */
#define SOC_I2S_CLKS {SOC_MOD_CLK_PLL_F160M, SOC_MOD_CLK_APLL}

/**
 * @brief I2S clock source enum
 *
 */
typedef enum {
    I2S_CLK_SRC_DEFAULT = SOC_MOD_CLK_PLL_F160M,                /*!< Select PLL_F160M as the default source clock  */
    I2S_CLK_SRC_PLL_160M = SOC_MOD_CLK_PLL_F160M,               /*!< Select PLL_F160M as the source clock */
    I2S_CLK_SRC_APLL = SOC_MOD_CLK_APLL,                        /*!< Select APLL as the source clock */
} soc_periph_i2s_clk_src_t;

/////////////////////////////////////////////////I2C////////////////////////////////////////////////////////////////////

/**
 * @brief Array initializer for all supported clock sources of I2C
 */
#define SOC_I2C_CLKS {SOC_MOD_CLK_APB}

/**
 * @brief Type of I2C clock source.
 */
typedef enum {
    I2C_CLK_SRC_APB = SOC_MOD_CLK_APB,
    I2C_CLK_SRC_DEFAULT = SOC_MOD_CLK_APB,
} soc_periph_i2c_clk_src_t;

/////////////////////////////////////////////////SPI////////////////////////////////////////////////////////////////////

/**
 * @brief Array initializer for all supported clock sources of SPI
 */
#define SOC_SPI_CLKS {SOC_MOD_CLK_APB}

/**
 * @brief Type of SPI clock source.
 */
typedef enum {
    SPI_CLK_SRC_DEFAULT = SOC_MOD_CLK_APB,      /*!< Select APB as SPI source clock */
    SPI_CLK_SRC_APB = SOC_MOD_CLK_APB,          /*!< Select APB as SPI source clock */
} soc_periph_spi_clk_src_t;

//////////////////////////////////////////////////SDM//////////////////////////////////////////////////////////////

/**
 * @brief Array initializer for all supported clock sources of SDM
 */
#define SOC_SDM_CLKS {SOC_MOD_CLK_APB}

/**
 * @brief Sigma Delta Modulator clock source
 */
typedef enum {
    SDM_CLK_SRC_APB = SOC_MOD_CLK_APB,     /*!< Select APB as the source clock */
    SDM_CLK_SRC_DEFAULT = SOC_MOD_CLK_APB, /*!< Select APB as the default clock choice */
} soc_periph_sdm_clk_src_t;

////////////////////////////////////////////////////DAC/////////////////////////////////////////////////////////////////

/**
 * @brief Array initializer for all supported clock sources of DAC digital controller
 */
#define SOC_DAC_DIGI_CLKS {SOC_MOD_CLK_PLL_D2, SOC_MOD_CLK_APLL}

/**
 * @brief DAC digital controller clock source
 *
 */
typedef enum {
    DAC_DIGI_CLK_SRC_PLLD2 = SOC_MOD_CLK_PLL_D2,    /*!< Select PLL_D2 as the source clock */
    DAC_DIGI_CLK_SRC_APLL = SOC_MOD_CLK_APLL,       /*!< Select APLL as the source clock */
    DAC_DIGI_CLK_SRC_DEFAULT = SOC_MOD_CLK_PLL_D2,  /*!< Select PLL_D2 as the default source clock  */
} soc_periph_dac_digi_clk_src_t;

/**
 * @brief Array initializer for all supported clock sources of DAC cosine wave generator
 */
#define SOC_DAC_COSINE_CLKS {SOC_MOD_CLK_RTC_FAST}

/**
 * @brief DAC cosine wave generator clock source
 *
 */
typedef enum {
    DAC_COSINE_CLK_SRC_RTC_FAST = SOC_MOD_CLK_RTC_FAST, /*!< Select RTC FAST as the source clock */
    DAC_COSINE_CLK_SRC_DEFAULT = SOC_MOD_CLK_RTC_FAST,  /*!< Select RTC FAST as the default source clock */
} soc_periph_dac_cosine_clk_src_t;

//////////////////////////////////////////////////TWAI/////////////////////////////////////////////////////////////////

/**
 * @brief Array initializer for all supported clock sources of TWAI
 */
#define SOC_TWAI_CLKS {SOC_MOD_CLK_APB}

/**
 * @brief TWAI clock source
 */
typedef enum {
    TWAI_CLK_SRC_APB = SOC_MOD_CLK_APB,     /*!< Select APB as the source clock */
    TWAI_CLK_SRC_DEFAULT = SOC_MOD_CLK_APB, /*!< Select APB as the default clock choice */
} soc_periph_twai_clk_src_t;

//////////////////////////////////////////////////ADC///////////////////////////////////////////////////////////////////

/**
 * @brief Array initializer for all supported clock sources of ADC digital controller
 */
#define SOC_ADC_DIGI_CLKS {SOC_MOD_CLK_APLL, SOC_MOD_CLK_PLL_F160M}

/**
 * @brief ADC digital controller clock source
 * @note  ADC DMA mode is clocked from I2S on ESP32, using `ADC_DIGI_` here for compatibility
 *        Its clock source is same as I2S
 */
typedef enum {
    ADC_DIGI_CLK_SRC_PLL_F160M = SOC_MOD_CLK_PLL_F160M, /*!< Select F160M as the source clock */
    ADC_DIGI_CLK_SRC_APLL = SOC_MOD_CLK_APLL,           /*!< Select APLL as the source clock */
    ADC_DIGI_CLK_SRC_DEFAULT = SOC_MOD_CLK_PLL_F160M,   /*!< Select F160M as the default clock choice */
} soc_periph_adc_digi_clk_src_t;

/**
 * @brief Array initializer for all supported clock sources of ADC RTC controller
 */
#define SOC_ADC_RTC_CLKS {SOC_MOD_CLK_RC_FAST}

/**
 * @brief ADC RTC controller clock source
 */
typedef enum {
    ADC_RTC_CLK_SRC_RC_FAST = SOC_MOD_CLK_RC_FAST,      /*!< Select RC_FAST as the source clock */
    ADC_RTC_CLK_SRC_DEFAULT = SOC_MOD_CLK_RC_FAST,      /*!< Select RC_FAST as the default clock choice */
} soc_periph_adc_rtc_clk_src_t;


//////////////////////////////////////////////////MWDT/////////////////////////////////////////////////////////////////

/**
 * @brief Array initializer for all supported clock sources of MWDT
 */
#define SOC_MWDT_CLKS {SOC_MOD_CLK_APB}

/**
 * @brief MWDT clock source
 */
typedef enum {
    MWDT_CLK_SRC_APB = SOC_MOD_CLK_APB,     /*!< Select APB as the source clock */
    MWDT_CLK_SRC_DEFAULT = SOC_MOD_CLK_APB, /*!< Select APB as the default clock choice */
} soc_periph_mwdt_clk_src_t;

//////////////////////////////////////////////////LEDC/////////////////////////////////////////////////////////////////

/**
 * @brief Array initializer for all supported clock sources of LEDC
 */
#define SOC_LEDC_CLKS {SOC_MOD_CLK_APB, SOC_MOD_CLK_RC_FAST, SOC_MOD_CLK_REF_TICK}

/**
 * @brief Type of LEDC clock source, reserved for the legacy LEDC driver
 */
typedef enum {
    LEDC_AUTO_CLK = 0,                              /*!< LEDC source clock will be automatically selected based on the giving resolution and duty parameter when init the timer*/
    LEDC_USE_APB_CLK = SOC_MOD_CLK_APB,             /*!< Select APB as the source clock */
    LEDC_USE_RC_FAST_CLK = SOC_MOD_CLK_RC_FAST,     /*!< Select RC_FAST as the source clock */
    LEDC_USE_REF_TICK = SOC_MOD_CLK_REF_TICK,       /*!< Select REF_TICK as the source clock */

    LEDC_USE_RTC8M_CLK __attribute__((deprecated("please use 'LEDC_USE_RC_FAST_CLK' instead"))) = LEDC_USE_RC_FAST_CLK,   /*!< Alias of 'LEDC_USE_RC_FAST_CLK' */
} soc_periph_ledc_clk_src_legacy_t;


//////////////////////////////////////////////////SDMMC///////////////////////////////////////////////////////////////

/**
 * @brief Array initializer for all supported clock sources of SDMMC
 */
#define SOC_SDMMC_CLKS {SOC_MOD_CLK_PLL_F160M}

/**
 * @brief Type of SDMMC clock source
 */
typedef enum {
    SDMMC_CLK_SRC_DEFAULT = SOC_MOD_CLK_PLL_F160M, /*!< Select PLL_160M as the default choice */
    SDMMC_CLK_SRC_PLL160M = SOC_MOD_CLK_PLL_F160M, /*!< Select PLL_160M as the source clock */
} soc_periph_sdmmc_clk_src_t;

//////////////////////////////////////////////CLOCK OUTPUT///////////////////////////////////////////////////////////
typedef enum {
    CLKOUT_SIG_I2S0     = 0,    /*!< I2S0 clock, depends on the i2s driver configuration */
    CLKOUT_SIG_PLL      = 1,    /*!< PLL_CLK is the output of crystal oscillator frequency multiplier */
    CLKOUT_SIG_RC_SLOW  = 4,    /*!< RC slow clock, depends on the RTC_CLK_SRC configuration */
    CLKOUT_SIG_XTAL     = 5,    /*!< Main crystal oscillator clock */
    CLKOUT_SIG_APLL     = 6,    /*!< Divided by PLL, frequency is configurable */
    CLKOUT_SIG_REF_TICK = 12,   /*!< Divided by APB clock, usually be 1MHz */
    CLKOUT_SIG_PLL_F80M = 13,   /*!< From PLL, usually be 80MHz */
    CLKOUT_SIG_RC_FAST  = 14,   /*!< RC fast clock, about 8MHz */
    CLKOUT_SIG_I2S1     = 15,   /*!< I2S1 clock, depends on the i2s driver configuration */
    CLKOUT_SIG_INVALID  = 0xFF,
} soc_clkout_sig_id_t;


#ifdef __cplusplus
}
#endif