omap: mux: Add new style pin multiplexing code for omap3

Initially only for 34xx. This code allows us to:

- Make the code more generic as the omap internal signal
  names can stay the same across omap generations for some
  devices

- Map mux registers to GPIO registers that is needed for
  dynamic muxing of pins during off-idle

- Override bootloader mux values via kernel cmdline using
  omap_mux=some.signa1=0x1234,some.signal2=0x1234

- View and set the mux registers via debugfs if
  CONFIG_DEBUG_FS is enabled

Cc: Mike Rapoport <mike@compulab.co.il>
Cc: Benoit Cousson <b-cousson@ti.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 777dc8a32df8..4f62fcbce108 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1787,6 +1787,11 @@ and is between 256 and 4096 characters. It is defined in the file
                         waiting for the ACK, so if this is set too high
                         interrupts *may* be lost!
 
+        omap_mux=       [OMAP] Override bootloader pin multiplexing.
+                        Format: <mux_mode0.mode_name=value>...
+                        For example, to override I2C bus2:
+                        omap_mux=i2c2_scl.i2c2_scl=0x100,i2c2_sda.i2c2_sda=0x100
+
         opl3=           [HW,OSS]
                         Format: <io>