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spi: sh-msiof: Extend support to 3 native chip selects

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Currently only the MSIOF_SYNC signal can be used as a native chip
select.  Extend support to up to 3 native chipselects using the
MSIOF_SS1 and MSIOF_SS2 signals.

Inspired by a patch in the BSP by Hiromitsu Yamasaki.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Geert Uytterhoeven
2017-12-13 20:05:11 +01:00
committed by Mark Brown
parent 7ff0b53c40
commit 9cce882bed
2 changed files with 18 additions and 6 deletions
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6
Documentation/devicetree/bindings/spi/sh-msiof.txt
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@@ -36,7 +36,11 @@ Required properties:
Optional properties:
- clocks : Must contain a reference to the functional clock.
- num-cs : Total number of chip-selects (default is 1)
- num-cs : Total number of chip selects (default is 1).
Up to 3 native chip selects are supported:
0: MSIOF_SYNC
1: MSIOF_SS1
2: MSIOF_SS2
- dmas : Must contain a list of two references to DMA
specifiers, one for transmission, and one for
reception.