fdt: Use device tree to provide SPI switch details

Rather than having the Seaboard SPI/UART switch in CONFIG options in the
header files, use the device tree to configure this

BUG=chromium-os:11623
TEST=build and boot U-Boot on Seaboard

Change-Id: If3b92b685b5fe31a97ef4bc3578a6aa00208d827
Reviewed-on: http://gerrit.chromium.org/gerrit/1661
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>

1 files changed, 20 insertions, 0 deletions

diff --git a/include/fdt_decode.h b/include/fdt_decode.h
index 303d5a8d33..7f9c1d5821 100644
--- a/include/fdt_decode.h
+++ b/include/fdt_decode.h
@@ -28,6 +28,8 @@
  * changes to support FDT are minimized.
  */
 
+#include <ns16550.h>
+
 /* A typedef for a physical address. We should move it to a generic place */
 #ifdef CONFIG_PHYS_64BIT
 typedef u64 addr_t;
@@ -46,6 +48,7 @@ typedef u32 addr_t;
  */
 enum fdt_compat_id {
 	COMPAT_UNKNOWN,
+	COMPAT_SPI_UART_SWITCH,		/* SPI / UART switch */
 
 	COMPAT_COUNT,
 };
@@ -71,6 +74,13 @@ struct fdt_uart {
 	enum fdt_compat_id compat; /* our selected driver */
 };
 
+/* Information about the spi/uart switch */
+struct fdt_spi_uart {
+	int gpio;			/* GPIO to control switch */
+	NS16550_t regs;			/* Address of UART affected */
+	u32 port;			/* Port number of UART affected */
+};
+
 /**
  * Return information from the FDT about the console UART. This looks for
  * an alias node called 'console' which must point to a UART. It then reads
@@ -115,3 +125,13 @@ void fdt_decode_uart_calc_divisor(struct fdt_uart *uart);
  * determining which driver will implement the decide described by the node.
  */
 enum fdt_compat_id fdt_decode_lookup(const void *blob, int node);
+
+/**
+ * Returns information from the FDT about the SPI / UART switch on tegra
+ * platforms.
+ *
+ * @param blob		FDT blob to use
+ * @param config	structure to use to return information
+ * @returns 0 on success, -ve on error, in which case config is unchanged
+ */
+int fdt_decode_get_spi_switch(const void *blob, struct fdt_spi_uart *config);