ARM: mach-shmobile: mackerel: clarify shdi/mmcif switch settings

* Pins 2 and 4 of switch 33 are documented as don't care on the PCB,
  my testing seems to confirm this.

* I have been unable to do anything sensible with S1 set to on.
  Am I missing something with regards to MMC1?

* Clarify which driver is needed for each switch setting.

* Should the AP4 board code be updated to allow the
  SHDI driver to access SHDI1 as the mackerel code does?

Signed-off-by: Simon Horman <horms@verge.net.au>
Acked-by: Yusuke Goda <yusuke.goda.sx@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 2 insertions, 3 deletions

diff --git a/arch/arm/mach-shmobile/board-mackerel.c b/arch/arm/mach-shmobile/board-mackerel.c
index 7b15d21f0f68..fb4213a4e15a 100644
--- a/arch/arm/mach-shmobile/board-mackerel.c
+++ b/arch/arm/mach-shmobile/board-mackerel.c
@@ -169,9 +169,8 @@
  *      SW1     |       SW33
  *              | bit1 | bit2 | bit3 | bit4
  * -------------+------+------+------+-------
- * MMC0   OFF   |  OFF |  ON  |  ON  |  X
- * MMC1   ON    |  OFF |  ON  |  X   | ON
- * SDHI1  OFF   |  ON  |   X  |  OFF | ON
+ * MMC0   OFF   |  OFF |   X  |  ON  |  X       (Use MMCIF)
+ * SDHI1  OFF   |  ON  |   X  |  OFF |  X       (Use MFD_SH_MOBILE_SDHI)
  *
  */