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tty: of_serial: support for 32 bit accesses

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Some platforms e.g. TI Davinci require 32-bit accesses to the UARTs.
The of_serial driver currently registers all UARTs as UPIO_MEM.  Add a
new attribute "reg-io-width" to allow the port to be registered with
different IO width requirements.

Acked-by: Alan Cox <[email protected]>
Signed-off-by: Jamie Iles <[email protected]>
Signed-off-by: Grant Likely <[email protected]>
This commit is contained in:
Jamie Iles 2011-06-27 13:32:34 +01:00 • committed by Grant Likely
commit 7423734e19
2 changed files with 20 additions and 0 deletions
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3
Documentation/devicetree/bindings/tty/serial/of-serial.txt
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@ -19,6 +19,9 @@ Optional properties:
- current-speed : the current active speed of the UART.
- reg-offset : offset to apply to the mapbase from the start of the registers.
- reg-shift : quantity to shift the register offsets by.
- reg-io-width : the size (in bytes) of the IO accesses that should be
performed on the device. There are some systems that require 32-bit
accesses to the UART (e.g. TI davinci).
- used-by-rtas : set to indicate that the port is in use by the OpenFirmware
RTAS and should not be registered.