1 files changed, 139 insertions, 0 deletions
diff --git a/include/board.h b/include/board.h
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index 0000000000..9dc78684f8
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+++ b/include/board.h
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+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * (C) Copyright 2017
+ * Mario Six,  Guntermann & Drunck GmbH, mario.six@gdsys.cc
+ */
+
+/*
+ * This uclass encapsulates hardware methods to gather information about a
+ * board or a specific device such as hard-wired GPIOs on GPIO expanders,
+ * read-only data in flash ICs, or similar.
+ *
+ * The interface offers functions to read the usual standard data types (bool,
+ * int, string) from the device, each of which is identified by a static
+ * numeric ID (which will usually be defined as a enum in a header file).
+ *
+ * If for example the board had a read-only serial number flash IC, we could
+ * call
+ *
+ * ret = board_detect(dev);
+ * if (ret) {
+ *	debug("board device not found.");
+ *	return ret;
+ * }
+ *
+ * ret = board_get_int(dev, ID_SERIAL_NUMBER, &serial);
+ * if (ret) {
+ *	debug("Error when reading serial number from device.");
+ *	return ret;
+ * }
+ *
+ * to read the serial number.
+ */
+
+struct board_ops {
+	/**
+	 * detect() - Run the hardware info detection procedure for this
+	 *	      device.
+	 * @dev:      The device containing the information
+	 *
+	 * This operation might take a long time (e.g. read from EEPROM,
+	 * check the presence of a device on a bus etc.), hence this is not
+	 * done in the probe() method, but later during operation in this
+	 * dedicated method.
+	 *
+	 * Return: 0 if OK, -ve on error.
+	 */
+	int (*detect)(struct udevice *dev);
+
+	/**
+	 * get_bool() - Read a specific bool data value that describes the
+	 *		hardware setup.
+	 * @dev:	The board instance to gather the data.
+	 * @id:		A unique identifier for the bool value to be read.
+	 * @val:	Pointer to a buffer that receives the value read.
+	 *
+	 * Return: 0 if OK, -ve on error.
+	 */
+	int (*get_bool)(struct udevice *dev, int id, bool *val);
+
+	/**
+	 * get_int() - Read a specific int data value that describes the
+	 *	       hardware setup.
+	 * @dev:       The board instance to gather the data.
+	 * @id:        A unique identifier for the int value to be read.
+	 * @val:       Pointer to a buffer that receives the value read.
+	 *
+	 * Return: 0 if OK, -ve on error.
+	 */
+	int (*get_int)(struct udevice *dev, int id, int *val);
+
+	/**
+	 * get_str() - Read a specific string data value that describes the
+	 *	       hardware setup.
+	 * @dev:	The board instance to gather the data.
+	 * @id:		A unique identifier for the string value to be read.
+	 * @size:	The size of the buffer to receive the string data.
+	 * @val:	Pointer to a buffer that receives the value read.
+	 *
+	 * Return: 0 if OK, -ve on error.
+	 */
+	int (*get_str)(struct udevice *dev, int id, size_t size, char *val);
+};
+
+#define board_get_ops(dev)	((struct board_ops *)(dev)->driver->ops)
+
+/**
+ * board_detect() - Run the hardware info detection procedure for this device.
+ *
+ * @dev:	The device containing the information
+ *
+ * Return: 0 if OK, -ve on error.
+ */
+int board_detect(struct udevice *dev);
+
+/**
+ * board_get_bool() - Read a specific bool data value that describes the
+ *		      hardware setup.
+ * @dev:	The board instance to gather the data.
+ * @id:		A unique identifier for the bool value to be read.
+ * @val:	Pointer to a buffer that receives the value read.
+ *
+ * Return: 0 if OK, -ve on error.
+ */
+int board_get_bool(struct udevice *dev, int id, bool *val);
+
+/**
+ * board_get_int() - Read a specific int data value that describes the
+ *		     hardware setup.
+ * @dev:	The board instance to gather the data.
+ * @id:		A unique identifier for the int value to be read.
+ * @val:	Pointer to a buffer that receives the value read.
+ *
+ * Return: 0 if OK, -ve on error.
+ */
+int board_get_int(struct udevice *dev, int id, int *val);
+
+/**
+ * board_get_str() - Read a specific string data value that describes the
+ *		     hardware setup.
+ * @dev:	The board instance to gather the data.
+ * @id:		A unique identifier for the string value to be read.
+ * @size:	The size of the buffer to receive the string data.
+ * @val:	Pointer to a buffer that receives the value read.
+ *
+ * Return: 0 if OK, -ve on error.
+ */
+int board_get_str(struct udevice *dev, int id, size_t size, char *val);
+
+/**
+ * board_get() - Return the board device for the board in question.
+ * @devp: Pointer to structure to receive the board device.
+ *
+ * Since there can only be at most one board instance, the API can supply a
+ * function that returns the unique device. This is especially useful for use
+ * in board files.
+ *
+ * Return: 0 if OK, -ve on error.
+ */
+int board_get(struct udevice **devp);