arm: add support for PDU001
This patch adds support for the PDU001 board.
Signed-off-by: Felix Brack <fb@ltec.ch>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/board/eets/pdu001/board.h b/board/eets/pdu001/board.h
new file mode 100644
index 0000000..3474e6a
--- /dev/null
+++ b/board/eets/pdu001/board.h
@@ -0,0 +1,38 @@
+/*
+ * board.h
+ *
+ * EETS GmbH PDU001 board information header
+ *
+ * Copyright (C) 2018 EETS GmbH - http://www.eets.ch/
+ *
+ * Copyright (C) 2011, Texas Instruments, Incorporated - http://www.ti.com/
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#ifndef _BOARD_H_
+#define _BOARD_H_
+
+/*
+ * We have two pin mux functions that must exist. First we need I2C0 to
+ * access the TPS65910 PMIC located on the M2 computing module.
+ * Second, if we want low-level debugging or a early UART (ie. before the
+ * pin controller driver is running), we need one of the UART ports UART0 to
+ * UART5 (usually UART3 since it is wired to K2).
+ * In case of I2C0 access we explicitly don't rely on the the ROM but we could
+ * do so as we use the primary mode (mode 0) for I2C0.
+ * All other multiplexing and pin configuration is done by the DT once it
+ * gets parsed by the pin controller driver.
+ * However we relay on the ROM to configure the pins of MMC0 (eMMC) as well
+ * as MMC1 (microSD card-cage) since these are our boot devices.
+ */
+void enable_uart0_pin_mux(void);
+void enable_uart1_pin_mux(void);
+void enable_uart2_pin_mux(void);
+void enable_uart3_pin_mux(void);
+void enable_uart4_pin_mux(void);
+void enable_uart5_pin_mux(void);
+void enable_uart_pin_mux(u32 addr);
+void enable_i2c0_pin_mux(void);
+
+#endif