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authorJohn Linn <john.linn@xilinx.com>2008-04-02 19:22:19 -0400
committerJosh Boyer <jwboyer@linux.vnet.ibm.com>2008-04-24 14:32:46 -0400
commitb912b5e2cfb35c02c9c79d3f6e31753f3be4dd83 (patch)
treef9b09696b097dc85cb69d0b28c321cdc92c6afe4 /Documentation/powerpc/booting-without-of.txt
parent2f0b45f846735b486c0383740d3959941c4721a4 (diff)
[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/booting-without-of.txt')
-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.
2601 differ between different families. May be 2601 differ between different families. May be
2602 'virtex2p', 'virtex4', or 'virtex5'. 2602 'virtex2p', 'virtex4', or 'virtex5'.
2603 2603
2604 vi) Xilinx Uart 16550
2605
2606 Xilinx UART 16550 devices are very similar to the NS16550 but with
2607 different register spacing and an offset from the base address.
2608
2609 Requred properties:
2610 - clock-frequency : Frequency of the clock input
2611 - reg-offset : A value of 3 is required
2612 - reg-shift : A value of 2 is required
2613
2614
2604 p) Freescale Synchronous Serial Interface 2615 p) Freescale Synchronous Serial Interface
2605 2616
2606 The SSI is a serial device that communicates with audio codecs. It can 2617 The SSI is a serial device that communicates with audio codecs. It can