[sw, dif] Add headers for the last remaining IPs

- Added the DIF header file for the last remaining IPs for which the DIF
effort has not yet begun. These are adc ctrl, flash ctrl, pattgen, spi
host and sysrst ctrl.

Signed-off-by: Srikrishna Iyer <sriyer@google.com>

sw/device/lib/dif/dif_adc_ctrl.h

@@ -0,0 +1,26 @@
+// Copyright lowRISC contributors.
+// Licensed under the Apache License, Version 2.0, see LICENSE for details.
+// SPDX-License-Identifier: Apache-2.0
+
+#ifndef OPENTITAN_SW_DEVICE_LIB_DIF_DIF_ADC_CTRL_H_
+#define OPENTITAN_SW_DEVICE_LIB_DIF_DIF_ADC_CTRL_H_
+
+/**
+ * @file
+ * @brief <a href="/hw/ip/adc_ctrl/doc/">ADC Controller</a> Device Interface
+ * Functions
+ */
+
+#include "sw/device/lib/dif/autogen/dif_adc_ctrl_autogen.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif  // __cplusplus
+
+// TODO: Add DIFs.
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif  // __cplusplus
+
+#endif  // OPENTITAN_SW_DEVICE_LIB_DIF_DIF_ADC_CTRL_H_

sw/device/lib/dif/dif_flash_ctrl.h

@@ -0,0 +1,26 @@
+// Copyright lowRISC contributors.
+// Licensed under the Apache License, Version 2.0, see LICENSE for details.
+// SPDX-License-Identifier: Apache-2.0
+
+#ifndef OPENTITAN_SW_DEVICE_LIB_DIF_DIF_FLASH_CTRL_H_
+#define OPENTITAN_SW_DEVICE_LIB_DIF_DIF_FLASH_CTRL_H_
+
+/**
+ * @file
+ * @brief <a href="/hw/ip/flash_ctrl/doc/">Flash Controller</a> Device
+ * Interface Functions
+ */
+
+#include "sw/device/lib/dif/autogen/dif_flash_ctrl_autogen.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif  // __cplusplus
+
+// TODO: Add DIFs.
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif  // __cplusplus
+
+#endif  // OPENTITAN_SW_DEVICE_LIB_DIF_DIF_FLASH_CTRL_H_

sw/device/lib/dif/dif_pattgen.h

@@ -0,0 +1,26 @@
+// Copyright lowRISC contributors.
+// Licensed under the Apache License, Version 2.0, see LICENSE for details.
+// SPDX-License-Identifier: Apache-2.0
+
+#ifndef OPENTITAN_SW_DEVICE_LIB_DIF_DIF_PATTGEN_H_
+#define OPENTITAN_SW_DEVICE_LIB_DIF_DIF_PATTGEN_H_
+
+/**
+ * @file
+ * @brief <a href="/hw/ip/pattgen/doc/">Pattern Generator</a> Device Interface
+ * Functions
+ */
+
+#include "sw/device/lib/dif/autogen/dif_pattgen_autogen.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif  // __cplusplus
+
+// TODO: Add DIFs.
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif  // __cplusplus
+
+#endif  // OPENTITAN_SW_DEVICE_LIB_DIF_DIF_PATTGEN_H_

sw/device/lib/dif/dif_spi_host.h

@@ -0,0 +1,26 @@
+// Copyright lowRISC contributors.
+// Licensed under the Apache License, Version 2.0, see LICENSE for details.
+// SPDX-License-Identifier: Apache-2.0
+
+#ifndef OPENTITAN_SW_DEVICE_LIB_DIF_DIF_SPI_HOST_H_
+#define OPENTITAN_SW_DEVICE_LIB_DIF_DIF_SPI_HOST_H_
+
+/**
+ * @file
+ * @brief <a href="/hw/ip/spi_host/doc/">SPI Host</a> Device Interface
+ * Functions
+ */
+
+#include "sw/device/lib/dif/autogen/dif_spi_host_autogen.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif  // __cplusplus
+
+// TODO: Add DIFs.
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif  // __cplusplus
+
+#endif  // OPENTITAN_SW_DEVICE_LIB_DIF_DIF_SPI_HOST_H_

sw/device/lib/dif/dif_sysrst_ctrl.h

@@ -0,0 +1,26 @@
+// Copyright lowRISC contributors.
+// Licensed under the Apache License, Version 2.0, see LICENSE for details.
+// SPDX-License-Identifier: Apache-2.0
+
+#ifndef OPENTITAN_SW_DEVICE_LIB_DIF_DIF_SYSRST_CTRL_H_
+#define OPENTITAN_SW_DEVICE_LIB_DIF_DIF_SYSRST_CTRL_H_
+
+/**
+ * @file
+ * @brief <a href="/hw/ip/sysrst_ctrl/doc/">System Reset Controller</a> Device
+ * Interface Functions
+ */
+
+#include "sw/device/lib/dif/autogen/dif_sysrst_ctrl_autogen.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif  // __cplusplus
+
+// TODO: Add DIFs.
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif  // __cplusplus
+
+#endif  // OPENTITAN_SW_DEVICE_LIB_DIF_DIF_SYSRST_CTRL_H_