esp32: Add LDO driver for ESP32-P4.

This commit adds support for the LDO driver for ESP32-P4 SOCs.

Signed-off-by: Artem Makarov <gh@artemy.nl>

docs/library/esp32.rst

@@ -613,3 +613,30 @@ supports 32-bit signed integers and blobs.
 .. method:: NVS.commit()
 
     Commits changes made by *set_xxx* methods to flash.
+
+.. _esp32.LDO:
+
+Low Dropout Voltage Regulator (LDO)
+-----------------------------------
+
+This class gives access to the Low Dropout Voltage Regulator (LDO) on the ESP32P4 chip.
+
+For more details see Espressif's `ESP-IDF LDO documentation.
+<https://docs.espressif.com/projects/esp-idf/en/stable/esp32p4/api-reference/peripherals/ldo_regulator.html>`_.
+
+.. class:: LDO(channel, voltage_mv, adjustable=False)
+
+    Create an object providing access to the Low Dropout Voltage Regulator for a given LDO *channel*.
+
+    Supported keyword arguments:
+
+      - *voltage_mv*: The voltage value to be set to the LDO channel, in millivolts
+      - *adjustable*: (Optional): Whether the LDO channel is adjustable, and the voltage can be updated by `adjust_voltage`
+
+.. method:: LDO.adjust_voltage(voltage_mv)
+
+    Adjust the voltage of the LDO channel.
+
+.. method:: LDO.release()
+
+    Release the LDO channel.

ports/esp32/esp32_common.cmake

@@ -138,6 +138,7 @@ list(APPEND MICROPY_SOURCE_PORT
     esp32_pcnt.c
     esp32_rmt.c
     esp32_ulp.c
+    esp32_ldo.c
     modesp32.c
     machine_hw_spi.c
     mpthreadport.c

ports/esp32/esp32_ldo.c

@@ -0,0 +1,148 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2025 Artem Makarov
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <stdio.h>
+
+#include "py/runtime.h"
+#include "py/mphal.h"
+#include "modesp32.h"
+
+#if SOC_GP_LDO_SUPPORTED
+
+#include "esp_ldo_regulator.h"
+
+// LDO (Low-Dropout Regulator) Driver
+//
+// This module provides access to the internal LDO voltage regulators,
+// which can supply adjustable voltages to internal peripherals or external components.
+
+typedef struct _esp32_ldo_obj_t {
+    mp_obj_base_t base;
+    esp_ldo_channel_handle_t ldo_channel_handle;
+    int chan_id; // Cached for display
+    int voltage_mv; // Cached for display
+} esp32_ldo_obj_t;
+
+static mp_obj_t esp32_ldo_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
+    static const mp_arg_t allowed_args[] = {
+        {MP_QSTR_channel_id, MP_ARG_REQUIRED | MP_ARG_INT, },
+        {MP_QSTR_voltage_mv, MP_ARG_REQUIRED | MP_ARG_INT, },
+        {MP_QSTR_adjustable, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = false}},
+    };
+    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
+    mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
+
+    esp_ldo_channel_config_t channel_config = {
+        .chan_id = args[0].u_int,
+        .voltage_mv = args[1].u_int,
+        .flags.adjustable = args[2].u_bool,
+    };
+
+    esp32_ldo_obj_t *self = mp_obj_malloc(esp32_ldo_obj_t, &esp32_ldo_type);
+    self->ldo_channel_handle = NULL;
+    self->chan_id = args[0].u_int;
+    self->voltage_mv = args[1].u_int;
+
+    check_esp_err(esp_ldo_acquire_channel(&channel_config, &self->ldo_channel_handle));
+    return MP_OBJ_FROM_PTR(self);
+}
+
+static void esp32_ldo_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
+    (void)kind;
+    const esp32_ldo_obj_t *self = self_in;
+    if (self->ldo_channel_handle != NULL) {
+        mp_printf(print, "LDO(channel=%d, voltage=%dmV)", self->chan_id, self->voltage_mv);
+    } else {
+        mp_printf(print, "LDO(released)");
+    }
+}
+
+static mp_obj_t esp32_ldo_adjust_voltage(mp_obj_t self_in, mp_obj_t voltage_mv_in) {
+    esp32_ldo_obj_t *self = self_in;
+    mp_int_t voltage_mv = mp_obj_get_int(voltage_mv_in);
+
+    check_esp_err(esp_ldo_channel_adjust_voltage(self->ldo_channel_handle, voltage_mv));
+    self->voltage_mv = voltage_mv;
+    return mp_const_none;
+}
+
+MP_DEFINE_CONST_FUN_OBJ_2(esp32_ldo_adjust_voltage_obj, esp32_ldo_adjust_voltage);
+
+static mp_obj_t esp32_ldo_release(mp_obj_t self_in) {
+    esp32_ldo_obj_t *self = self_in;
+    if (self->ldo_channel_handle != NULL) {
+        check_esp_err(esp_ldo_release_channel(self->ldo_channel_handle));
+        self->ldo_channel_handle = NULL;
+    }
+    return mp_const_none;
+}
+
+MP_DEFINE_CONST_FUN_OBJ_1(esp32_ldo_release_obj, esp32_ldo_release);
+
+static mp_obj_t esp32_ldo_del(mp_obj_t self_in) {
+    esp32_ldo_obj_t *self = self_in;
+    if (self->ldo_channel_handle != NULL) {
+        esp_ldo_release_channel(self->ldo_channel_handle);
+        self->ldo_channel_handle = NULL;
+    }
+    return mp_const_none;
+}
+
+static MP_DEFINE_CONST_FUN_OBJ_1(esp32_ldo_del_obj, esp32_ldo_del);
+
+static mp_obj_t esp32_ldo_enter(mp_obj_t self_in) {
+    return self_in;
+}
+
+static MP_DEFINE_CONST_FUN_OBJ_1(esp32_ldo_enter_obj, esp32_ldo_enter);
+
+static mp_obj_t esp32_ldo_exit(size_t n_args, const mp_obj_t *args) {
+    (void)n_args;
+    return esp32_ldo_release(args[0]);
+}
+
+static MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(esp32_ldo_exit_obj, 4, 4, esp32_ldo_exit);
+
+static const mp_rom_map_elem_t esp32_ldo_locals_dict_table[] = {
+    {MP_ROM_QSTR(MP_QSTR_adjust_voltage), MP_ROM_PTR(&esp32_ldo_adjust_voltage_obj)},
+    {MP_ROM_QSTR(MP_QSTR_release), MP_ROM_PTR(&esp32_ldo_release_obj)},
+    {MP_ROM_QSTR(MP_QSTR___del__), MP_ROM_PTR(&esp32_ldo_del_obj)},
+    {MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&esp32_ldo_enter_obj)},
+    {MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&esp32_ldo_exit_obj)},
+};
+
+static MP_DEFINE_CONST_DICT(esp32_ldo_locals_dict, esp32_ldo_locals_dict_table);
+
+MP_DEFINE_CONST_OBJ_TYPE(
+    esp32_ldo_type,
+    MP_QSTR_LDO,
+    MP_TYPE_FLAG_NONE,
+    make_new, esp32_ldo_make_new,
+    print, esp32_ldo_print,
+    locals_dict, &esp32_ldo_locals_dict
+    );
+
+#endif // SOC_GP_LDO_SUPPORTED

ports/esp32/modesp32.c

@@ -355,6 +355,9 @@ static const mp_rom_map_elem_t esp32_module_globals_table[] = {
     #if CONFIG_IDF_TARGET_ESP32 || CONFIG_IDF_TARGET_ESP32S2 || CONFIG_IDF_TARGET_ESP32S3
     { MP_ROM_QSTR(MP_QSTR_ULP), MP_ROM_PTR(&esp32_ulp_type) },
     #endif
+    #if SOC_GP_LDO_SUPPORTED
+    { MP_ROM_QSTR(MP_QSTR_LDO), MP_ROM_PTR(&esp32_ldo_type) },
+    #endif
 
     { MP_ROM_QSTR(MP_QSTR_WAKEUP_ALL_LOW), MP_ROM_FALSE },
     { MP_ROM_QSTR(MP_QSTR_WAKEUP_ANY_HIGH), MP_ROM_TRUE },

ports/esp32/modesp32.h

@@ -82,6 +82,7 @@ extern const mp_obj_type_t esp32_nvs_type;
 extern const mp_obj_type_t esp32_partition_type;
 extern const mp_obj_type_t esp32_rmt_type;
 extern const mp_obj_type_t esp32_ulp_type;
+extern const mp_obj_type_t esp32_ldo_type;
 
 #if MICROPY_PY_ESP32_PCNT
 extern const mp_obj_type_t esp32_pcnt_type;