[ARM] MINI2440: Document the mini2440= kernel parameter

Also explains why the touchscreen support is not present,
and were to find a working one...

Signed-off-by: Michel Pollet <buserror@gmail.com>
[ben-linux@fluff.org: Fix header description]
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

1 files changed, 21 insertions, 0 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 5f66ba295c5d..4b765b7ded9f 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1351,6 +1351,27 @@ and is between 256 and 4096 characters. It is defined in the file
         min_addr=nn[KMG]        [KNL,BOOT,ia64] All physical memory below this
                         physical address is ignored.
 
+        mini2440=       [ARM,HW,KNL]
+                        Format:[0..2][b][c][t]
+                        Default: "0tb"
+                        MINI2440 configuration specification:
+                        0 - The attached screen is the 3.5" TFT
+                        1 - The attached screen is the 7" TFT
+                        2 - The VGA Shield is attached (1024x768)
+                        Leaving out the screen size parameter will not load
+                        the TFT driver, and the framebuffer will be left
+                        unconfigured.
+                        b - Enable backlight. The TFT backlight pin will be
+                        linked to the kernel VESA blanking code and a GPIO
+                        LED. This parameter is not necessary when using the
+                        VGA shield.
+                        c - Enable the s3c camera interface.
+                        t - Reserved for enabling touchscreen support. The
+                        touchscreen support is not enabled in the mainstream
+                        kernel as of 2.6.30, a preliminary port can be found
+                        in the "bleeding edge" mini2440 support kernel at
+                        http://repo.or.cz/w/linux-2.6/mini2440.git
+
         mminit_loglevel=
                         [KNL] When CONFIG_DEBUG_MEMORY_INIT is set, this
                         parameter allows control of the logging verbosity for