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linux-next/Documentation/devicetree
Cyrille Pitchen 05a051436b ARM: at91/dt: add a new DT property to support FIFOs on Atmel USARTs
This patch adds a new DT property, "atmel,fifo-size", to enable and set
the maximum number of data the RX and TX FIFOs can store on FIFO capable
USARTs.

Please be aware that the VERSION register can not be used to guess the
size of FIFOs. Indeed, for a given hardware version, the USARTs can be
integrated on Atmel SoCs with different FIFO sizes. Also the
"atmel,fifo-size" property is optional as older USARTs don't embed FIFO at
all.

Besides, the FIFO size can not be read or guessed from other registers:
When designing the FIFO feature, no dedicated registers were added to
store this size. Unsed spaces in the I/O register range are limited and
better reserved for future usages. Instead, the FIFO size of each
peripheral is documented in the programmer datasheet.

Finally, on a given SoC, there can be several instances of USART with
different FIFO sizes. This explain why we'd rather use a dedicated DT
property than use the "compatible" property.

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-07-23 18:00:42 -07:00
..
bindings ARM: at91/dt: add a new DT property to support FIFOs on Atmel USARTs 2015-07-23 18:00:42 -07:00
00-INDEX
booting-without-of.txt ARM: 8354/1: Documentation: devicetree: root node serial-number property documentation 2015-05-08 10:42:34 +01:00
changesets.txt
dynamic-resolution-notes.txt of: Introduce Device Tree resolve support. 2014-10-04 21:24:26 +01:00
of_unittest.txt Documentation: rename of_selftest.txt to of_unittest.txt 2015-03-25 00:50:53 -05:00
overlay-notes.txt Documentation: devicetree: Fix double words in Doumentation/devicetree 2015-01-28 15:13:11 -07:00
todo.txt of: Eliminate of_allnodes list 2014-11-04 13:29:38 +00:00
usage-model.txt