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authorJohn Linn <john.linn@xilinx.com>2008-04-03 03:22:19 +0400
committerJosh Boyer <jwboyer@linux.vnet.ibm.com>2008-04-24 22:32:46 +0400
commitb912b5e2cfb35c02c9c79d3f6e31753f3be4dd83 (patch)
treef9b09696b097dc85cb69d0b28c321cdc92c6afe4 /Documentation/powerpc
parent2f0b45f846735b486c0383740d3959941c4721a4 (diff)
downloadlinux-b912b5e2cfb35c02c9c79d3f6e31753f3be4dd83.tar.xz
[POWERPC] Xilinx: of_serial support for Xilinx uart 16550.
The Xilinx 16550 uart core is not a standard 16550 because it uses word-based addressing rather than byte-based addressing. With additional properties it is compatible with the open firmware 'ns16550' compatible binding. This code updates the of_serial driver to handle the reg-offset and reg-shift properties to enable this core to be used. Signed-off-by: John Linn <john.linn@xilinx.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Diffstat (limited to 'Documentation/powerpc')
-rw-r--r--Documentation/powerpc/booting-without-of.txt11
1 files changed, 11 insertions, 0 deletions
diff --git a/Documentation/powerpc/booting-without-of.txt b/Documentation/powerpc/booting-without-of.txt
index 4cc780024e6c..cf89e8cfd5bf 100644
--- a/Documentation/powerpc/booting-without-of.txt
+++ b/Documentation/powerpc/booting-without-of.txt
@@ -2601,6 +2601,17 @@ platforms are moved over to use the flattened-device-tree model.
differ between different families. May be
'virtex2p', 'virtex4', or 'virtex5'.
+ vi) Xilinx Uart 16550
+
+ Xilinx UART 16550 devices are very similar to the NS16550 but with
+ different register spacing and an offset from the base address.
+
+ Requred properties:
+ - clock-frequency : Frequency of the clock input
+ - reg-offset : A value of 3 is required
+ - reg-shift : A value of 2 is required
+
+
p) Freescale Synchronous Serial Interface
The SSI is a serial device that communicates with audio codecs. It can