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| author | Greg Ungerer <gerg@uclinux.org> | 2014-09-28 23:24:04 +1000 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2014-10-01 19:21:51 +0100 |
| commit | df59fa7f4bca9658b75f0f5fee225b3a057475c5 (patch) | |
| tree | 6c01e397e59715c8043f0de634299f2273bac18b /Documentation | |
| parent | 7d1311b93e58ed55f3a31cc8f94c4b8fe988a2b9 (diff) | |
| download | linux-df59fa7f4bca9658b75f0f5fee225b3a057475c5.tar.bz2 | |
spi: orion: support armada extended baud rates
The Armada SoC family implementation of this SPI hardware module has
extended the configuration register to allow for a wider range of SPI
clock rates. Specifically the Serial Baud Rate Pre-selection bits in the
SPI Interface Configuration Register now also use bits 6 and 7 as well.
Modify the baud rate calculation to handle these differences for the
Armada case. Potentially a baud rate can be setup using a number of
different pre-scalar and scalar combinations. This code tries all
possible pre-scalar divisors (8 in total) to try and find the most
accurate set.
This change introduces (and documents) a new device tree compatible
device name "armada-370-spi" to support this.
Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Tested-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Reviewed-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/spi/spi-orion.txt | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/Documentation/devicetree/bindings/spi/spi-orion.txt b/Documentation/devicetree/bindings/spi/spi-orion.txt index a3ff50fc76fb..50c3a3de61c1 100644 --- a/Documentation/devicetree/bindings/spi/spi-orion.txt +++ b/Documentation/devicetree/bindings/spi/spi-orion.txt @@ -1,7 +1,7 @@ Marvell Orion SPI device Required properties: -- compatible : should be "marvell,orion-spi". +- compatible : should be "marvell,orion-spi" or "marvell,armada-370-spi". - reg : offset and length of the register set for the device - cell-index : Which of multiple SPI controllers is this. Optional properties: |