drivers: esp32: SDHC implementation

Implementation of SDHC driver for ESP32

Signed-off-by: Raffael Rostagno <raffael.rostagno@espressif.com>

dts/bindings/sdhc/espressif,esp32-sdhc-slot.yaml

@@ -0,0 +1,76 @@
+# Copyright (c) 2024 Espressif Systems (Shanghai) Co., Ltd.
+# SPDX-License-Identifier: Apache-2.0
+
+description: Espressif ESP32 SDHC controller slot
+
+compatible: "espressif,esp32-sdhc-slot"
+
+include: [sdhc.yaml, pinctrl-device.yaml]
+
+properties:
+  reg:
+    required: true
+
+  pinctrl-0:
+    required: true
+
+  pinctrl-names:
+    required: true
+
+  bus-width:
+    type: int
+    enum:
+      - 1
+      - 4
+    default: 4
+    description: SD bus width in bits
+
+  clk-pin:
+    type: int
+    description: |
+      Clock pin for ESP32 and SoC models with fixed pins for SDIO.
+      For devices with GPIO matrix support, configuration shall be done
+      using pin control (pinctrl-0 field).
+
+  cmd-pin:
+    type: int
+    description: |
+      Command pin for ESP32 and SoC models with fixed pins for SDIO.
+      For devices with GPIO matrix support, configuration shall be done
+      using pin control (pinctrl-0 field).
+
+  d0-pin:
+    type: int
+    description: |
+      Data 0 pin for ESP32 and SoC models with fixed pins for SDIO.
+      For devices with GPIO matrix support, configuration shall be done
+      using pin control (pinctrl-0 field).
+
+  d1-pin:
+    type: int
+    description: |
+      Data 1 pin for ESP32 and SoC models with fixed pins for SDIO.
+      For devices with GPIO matrix support, configuration shall be done
+      using pin control (pinctrl-0 field).
+
+  d2-pin:
+    type: int
+    description: |
+      Data 2 pin for ESP32 and SoC models with fixed pins for SDIO.
+      For devices with GPIO matrix support, configuration shall be done
+      using pin control (pinctrl-0 field).
+
+  d3-pin:
+    type: int
+    description: |
+      Data 3 pin for ESP32 and SoC models with fixed pins for SDIO.
+      For devices with GPIO matrix support, configuration shall be done
+      using pin control (pinctrl-0 field).
+
+  pwr-gpios:
+    type: phandle-array
+    description: |
+      Power pin
+      This is a configurable pin to deliver power supply to the SD card.
+      It is configured as a GPIO in order to execute power toggles and
+      reinitialize the SD slave when necessary.

dts/bindings/sdhc/espressif,esp32-sdhc.yaml

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+# Copyright (c) 2024 Espressif Systems (Shanghai) Co., Ltd.
+# SPDX-License-Identifier: Apache-2.0
+
+description: Espressif ESP32 SDHC controller
+
+compatible: "espressif,esp32-sdhc"
+
+include: [base.yaml]
+
+properties:
+  reg:
+    required: true
+
+  interrupts:
+    required: true