davinci: DA830/OMAP-L137 EVM: use runtime detection for UI card

This patch supports runtime detection of DA830 UI card and
eliminates the need for DA830_UI config option. Successful
probe of GPIO expander present on the UI card is used to
detect its presence. For this reason, GPIO_PCF857X is auto-
selected when DA830 EVM is configured. In case the UI card
is absent, the probe fails in reasonable time.

As a side effect this patch also gets rid of the voilation
of Documentation/SubmittingPatches section 2.2 in function
da830_evm_ui_expander_setup()

Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

1 files changed, 7 insertions, 10 deletions

diff --git a/arch/arm/mach-davinci/Kconfig b/arch/arm/mach-davinci/Kconfig
index 89548287ca0f..006144401c95 100644
--- a/arch/arm/mach-davinci/Kconfig
+++ b/arch/arm/mach-davinci/Kconfig
@@ -100,21 +100,18 @@ config MACH_DAVINCI_DA830_EVM
         bool "TI DA830/OMAP-L137 Reference Platform"
         default ARCH_DAVINCI_DA830
         depends on ARCH_DAVINCI_DA830
+        select GPIO_PCF857X
         help
           Say Y here to select the TI DA830/OMAP-L137 Evaluation Module.
 
-config DA830_UI
-        bool "DA830/OMAP-L137 UI (User Interface) board support"
-        depends on MACH_DAVINCI_DA830_EVM
-        help
-          Say Y here if you have the DA830/OMAP-L137 UI
-          (User Interface) board installed and you want to
-          enable the peripherals located on User Interface
-          board.
-
 choice
         prompt "Select DA830/OMAP-L137 UI board peripheral"
-        depends on DA830_UI
+        depends on MACH_DAVINCI_DA830_EVM
+        help
+          The presence of UI card on the DA830/OMAP-L137 EVM is detected
+          automatically based on successful probe of the I2C based GPIO
+          expander on that board. This option selected in this menu has
+          an effect only in case of a successful UI card detection.
 
 config DA830_UI_LCD
         bool "LCD"