clock: esp32c6: enable and calibrate digital regulators

Enable the RTC-domain and main digital regulators early in clock init,
then load and program the factory/runtime calibrated bias values for
high-power and low-power regulators into the PMU. This ensures the
correct voltage/current settings for stable, low-noise clock operation
in active, modem and sleep modes.

Signed-off-by: Sylvio Alves <sylvio.alves@espressif.com>

drivers/clock_control/clock_control_esp32.c

@@ -646,6 +646,19 @@ static int esp32_cpu_clock_configure(const struct esp32_cpu_clock_config *cpu_cf
 	REG_SET_FIELD(LP_CLKRST_FOSC_CNTL_REG, LP_CLKRST_FOSC_DFREQ, rtc_clk_cfg.clk_8m_dfreq);
 	REGI2C_WRITE_MASK(I2C_DIG_REG, I2C_DIG_REG_SCK_DCAP, rtc_clk_cfg.slow_clk_dcap);
 	REG_SET_FIELD(LP_CLKRST_RC32K_CNTL_REG, LP_CLKRST_RC32K_DFREQ, rtc_clk_cfg.rc32k_dfreq);
+	REGI2C_WRITE_MASK(I2C_DIG_REG, I2C_DIG_REG_ENIF_RTC_DREG, 1);
+	REGI2C_WRITE_MASK(I2C_DIG_REG, I2C_DIG_REG_ENIF_DIG_DREG, 1);
+
+	uint32_t hp_cali_dbias = get_act_hp_dbias();
+	uint32_t lp_cali_dbias = get_act_lp_dbias();
+
+	SET_PERI_REG_BITS(PMU_HP_ACTIVE_HP_REGULATOR0_REG, PMU_HP_ACTIVE_HP_REGULATOR_DBIAS,
+			  hp_cali_dbias, PMU_HP_ACTIVE_HP_REGULATOR_DBIAS_S);
+	SET_PERI_REG_BITS(PMU_HP_MODEM_HP_REGULATOR0_REG, PMU_HP_MODEM_HP_REGULATOR_DBIAS,
+			  hp_cali_dbias, PMU_HP_MODEM_HP_REGULATOR_DBIAS_S);
+	SET_PERI_REG_BITS(PMU_HP_SLEEP_LP_REGULATOR0_REG, PMU_HP_SLEEP_LP_REGULATOR_DBIAS,
+			  lp_cali_dbias, PMU_HP_SLEEP_LP_REGULATOR_DBIAS_S);
+
 #else
 	REG_SET_FIELD(RTC_CNTL_REG, RTC_CNTL_SCK_DCAP, rtc_clk_cfg.slow_clk_dcap);
 	REG_SET_FIELD(RTC_CNTL_CLK_CONF_REG, RTC_CNTL_CK8M_DFREQ, rtc_clk_cfg.clk_8m_dfreq);
@@ -655,6 +668,9 @@ static int esp32_cpu_clock_configure(const struct esp32_cpu_clock_config *cpu_cf
 	REG_SET_FIELD(RTC_CNTL_CLK_CONF_REG, RTC_CNTL_CK8M_DIV_SEL, rtc_clk_cfg.clk_8m_div - 1);
 #elif defined(CONFIG_SOC_SERIES_ESP32C6)
 	clk_ll_rc_fast_tick_conf();
+
+	esp_rom_uart_tx_wait_idle(0);
+	rtc_clk_xtal_freq_update(rtc_clk_cfg.xtal_freq);
 #else
 	/* Configure 150k clock division */
 	rtc_clk_divider_set(rtc_clk_cfg.clk_rtc_clk_div);