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authorBen Dooks <ben-linux@fluff.org>2010-05-24 12:13:30 +0900
committerBen Dooks <ben-linux@fluff.org>2010-05-28 19:31:31 +0900
commitd192baeaa7a068b4e5151a34b4121d99938e396d (patch)
treeb32e615deb177edd1d673dde9faebea43447c44d /Documentation
parent941439267820c6811f44f247caefe823d4e4f5cd (diff)
downloadlinux-2.6.34-ux500-d192baeaa7a068b4e5151a34b4121d99938e396d.tar.gz
ARM: SAMSUNG: Documentation: add documentation on GPIO code
Add some documentation in Documentation/arm/Samsung for the GPIO code and where to look for the necessary functions. Update the S3C24XX case as well. Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/arm/Samsung-S3C24XX/GPIO.txt2
-rw-r--r--Documentation/arm/Samsung-S3C24XX/Overview.txt4
-rw-r--r--Documentation/arm/Samsung/GPIO.txt42
3 files changed, 48 insertions, 0 deletions
diff --git a/Documentation/arm/Samsung-S3C24XX/GPIO.txt b/Documentation/arm/Samsung-S3C24XX/GPIO.txt
index 228ecb61d2f..816d6071669 100644
--- a/Documentation/arm/Samsung-S3C24XX/GPIO.txt
+++ b/Documentation/arm/Samsung-S3C24XX/GPIO.txt
@@ -12,6 +12,8 @@ Introduction
of the s3c2410 GPIO system, please read the Samsung provided
data-sheet/users manual to find out the complete list.
+ See Documentation/arm/Samsung/GPIO.txt for the core implemetation.
+
GPIOLIB
-------
diff --git a/Documentation/arm/Samsung-S3C24XX/Overview.txt b/Documentation/arm/Samsung-S3C24XX/Overview.txt
index 0f11fcc1d51..c12bfc1a00c 100644
--- a/Documentation/arm/Samsung-S3C24XX/Overview.txt
+++ b/Documentation/arm/Samsung-S3C24XX/Overview.txt
@@ -218,6 +218,10 @@ GPIO
As of v2.6.34, the move towards using gpiolib support is almost
complete, and very little of the old calls are left.
+ See Documentation/arm/Samsung-S3C24XX/GPIO.txt for the S3C24XX specific
+ support and Documentation/arm/Samsung/GPIO.txt for the core Samsung
+ implementation.
+
Clock Management
----------------
diff --git a/Documentation/arm/Samsung/GPIO.txt b/Documentation/arm/Samsung/GPIO.txt
new file mode 100644
index 00000000000..05850c62abe
--- /dev/null
+++ b/Documentation/arm/Samsung/GPIO.txt
@@ -0,0 +1,42 @@
+ Samsung GPIO implementation
+ ===========================
+
+Introduction
+------------
+
+This outlines the Samsung GPIO implementation and the architecture
+specfic calls provided alongisde the drivers/gpio core.
+
+
+S3C24XX (Legacy)
+----------------
+
+See Documentation/arm/Samsung-S3C24XX/GPIO.txt for more information
+about these devices. Their implementation is being brought into line
+with the core samsung implementation described in this document.
+
+
+GPIOLIB integration
+-------------------
+
+The gpio implementation uses gpiolib as much as possible, only providing
+specific calls for the items that require Samsung specific handling, such
+as pin special-function or pull resistor control.
+
+GPIO numbering is synchronised between the Samsung and gpiolib system.
+
+
+PIN configuration
+-----------------
+
+Pin configuration is specific to the Samsung architecutre, with each SoC
+registering the necessary information for the core gpio configuration
+implementation to configure pins as necessary.
+
+The s3c_gpio_cfgpin() and s3c_gpio_setpull() provide the means for a
+driver or machine to change gpio configuration.
+
+See arch/arm/plat-samsung/include/plat/gpio-cfg.h for more information
+on these functions.
+
+