LEDC: improved support for ESP32-C3 and refactored divisor calculation

As ESP32C3 does not have support for REF_TICK source clock, it is now not
possible to select it anymore.
Auto cfg clock has been improved for all boards.

components/hal/esp32/include/hal/ledc_ll.h

@@ -22,6 +22,27 @@
 #include "soc/ledc_struct.h"
 
 #define LEDC_LL_GET_HW() &LEDC
+#define LEDC_LL_FRACTIONAL_BITS    (8)
+#define LEDC_LL_FRACTIONAL_MAX     ((1 << LEDC_LL_FRACTIONAL_BITS) - 1)
+
+#define LEDC_LL_GLOBAL_CLOCKS { \
+                                LEDC_USE_APB_CLK, \
+                                LEDC_USE_RTC8M_CLK, \
+                            }
+#define LEDC_LL_TIMER_SPECIFIC_CLOCKS \
+                            {\
+                                { \
+                                    .clk = LEDC_REF_TICK, \
+                                    .freq = LEDC_REF_CLK_HZ, \
+                                } \
+                            }
+
+/* On ESP32, APB clock is a timer-specific clock only in fast clock mode */
+#define LEDC_LL_IS_TIMER_SPECIFIC_CLOCK(SPEED, CLK) (\
+                                                     ((CLK) == LEDC_USE_REF_TICK) || \
+                                                     ((SPEED) == LEDC_HIGH_SPEED_MODE && (CLK) == LEDC_USE_APB_CLK) \
+                                                    )
+
 
 #ifdef __cplusplus
 extern "C" {