ARM: OMAP2+: Add function to read GPMC settings from device-tree

Adds a function to read the various GPMC chip-select settings from
device-tree and store them in the gpmc_settings structure.

Update the GPMC device-tree binding documentation to describe these
options.

Signed-off-by: Jon Hunter <jon-hunter@ti.com>
Tested-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/bus/ti-gpmc.txt b/Documentation/devicetree/bindings/bus/ti-gpmc.txt
index 5ddb2e9efaaa..6fde1cfe51f8 100644
--- a/Documentation/devicetree/bindings/bus/ti-gpmc.txt
+++ b/Documentation/devicetree/bindings/bus/ti-gpmc.txt
@@ -65,6 +65,29 @@ The following are only applicable to OMAP3+ and AM335x:
  - gpmc,wr-access
  - gpmc,wr-data-mux-bus
 
+GPMC chip-select settings properties for child nodes. All are optional.
+
+- gpmc,burst-length     Page/burst length. Must be 4, 8 or 16.
+- gpmc,burst-wrap       Enables wrap bursting
+- gpmc,burst-read       Enables read page/burst mode
+- gpmc,burst-write      Enables write page/burst mode
+- gpmc,device-nand      Device is NAND
+- gpmc,device-width     Total width of device(s) connected to a GPMC
+                        chip-select in bytes. The GPMC supports 8-bit
+                        and 16-bit devices and so this property must be
+                        1 or 2.
+- gpmc,mux-add-data     Address and data multiplexing configuration.
+                        Valid values are 1 for address-address-data
+                        multiplexing mode and 2 for address-data
+                        multiplexing mode.
+- gpmc,sync-read        Enables synchronous read. Defaults to asynchronous
+                        is this is not set.
+- gpmc,sync-write       Enables synchronous writes. Defaults to asynchronous
+                        is this is not set.
+- gpmc,wait-pin         Wait-pin used by client. Must be less than
+                        "gpmc,num-waitpins".
+- gpmc,wait-on-read     Enables wait monitoring on reads.
+- gpmc,wait-on-write    Enables wait monitoring on writes.
 
 Example for an AM33xx board: