fdt: Support for ISA busses

[u-boot] / drivers / core / Kconfig

diff --git a/drivers/core/Kconfig b/drivers/core/Kconfig
index c5c9d2a42e5c943572740feac34042915696b266..87495614c2d5907864c07cfd2e4d08ce5ead3a25 100644 (file)
--- a/drivers/core/Kconfig
+++ b/drivers/core/Kconfig
@@ -178,4 +178,27 @@ config SPL_OF_TRANSLATE
          used for the address translation. This function is faster and
          smaller in size than fdt_translate_address().
 
+config OF_ISA_BUS
+       bool
+       depends on OF_TRANSLATE
+       help
+         Is this option is enabled then support for the ISA bus will
+         be included for addresses read from DT. This is something that
+         should be known to be required or not based upon the board
+         being targetted, and whether or not it makes use of an ISA bus.
+
+         The bus is matched based upon its node name equalling "isa". The
+         busses #address-cells should equal 2, with the first cell being
+         used to hold flags & flag 0x1 indicating that the address range
+         should be accessed using I/O port in/out accessors. The second
+         cell holds the offset into ISA bus address space. The #size-cells
+         property should equal 1, and of course holds the size of the
+         address range used by a device.
+
+         If this option is not enabled then support for the ISA bus is
+         not included and any such busses used in DT will be treated as
+         typical simple-bus compatible busses. This will lead to
+         mistranslation of device addresses, so ensure that this is
+         enabled if your board does include an ISA bus.
+
 endmenu