SSBI is the Qualcomm single-wire serial bus interface used to connect
the MSM devices to the PMIC and other devices.

Since SSBI only supports a single slave, the driver gets the name of the
slave device passed in from the board file through the master device's
platform data.

SSBI registers pretty early (postcore), so that the PMIC can come up
before the board init. This is useful if the board init requires the
use of gpios that are connected through the PMIC.

Based on a patch by Dima Zavin [off-list ref] that can be found at:
http://android.git.kernel.org/?p=kernel/msm.git;a=commitdiff;h=eb060bac4

This patch adds PMIC Arbiter support for the MSM8660. The PMIC Arbiter
is a hardware wrapper around the SSBI 2.0 controller that is designed to
overcome concurrency issues and security limitations.  A controller_type
field is added to the platform data to specify the type of the SSBI
controller (1.0, 2.0, or PMIC Arbiter).

Signed-off-by: Kenneth Heitke <redacted>
---
 arch/arm/mach-msm/Kconfig                 |   16 ++
 arch/arm/mach-msm/Makefile                |    1 +
 arch/arm/mach-msm/include/mach/msm_ssbi.h |   38 +++
 arch/arm/mach-msm/ssbi.c                  |  376 +++++++++++++++++++++++++++++
 4 files changed, 431 insertions(+), 0 deletions(-)
 create mode 100644 arch/arm/mach-msm/include/mach/msm_ssbi.h
 create mode 100644 arch/arm/mach-msm/ssbi.c

diff --git a/arch/arm/mach-msm/Kconfig b/arch/arm/mach-msm/Kconfig
index 997c5bd..f35c3d9 100644
--- a/arch/arm/mach-msm/Kconfig
+++ b/arch/arm/mach-msm/Kconfig

@@ -24,6 +24,7 @@ config ARCH_MSM7X30
 	select MSM_GPIOMUX
 	select MSM_PROC_COMM
 	select HAS_MSM_DEBUG_UART_PHYS
+	select HAS_MSM_SSBI
 
 config ARCH_QSD8X50
 	bool "QSD8X50"

@@ -46,6 +47,7 @@ config ARCH_MSM8X60
 	select MSM_V2_TLMM
 	select MSM_GPIOMUX
 	select MSM_SCM if SMP
+	select HAS_MSM_SSBI
 
 config ARCH_MSM8960
 	bool "MSM8960"

@@ -56,6 +58,7 @@ config ARCH_MSM8960
 	select MSM_V2_TLMM
 	select MSM_GPIOMUX
 	select MSM_SCM if SMP
+	select HAS_MSM_SSBI
 
 endchoice
 

@@ -190,6 +193,16 @@ choice
 endchoice
 endif
 
+config MSM_SSBI
+	bool "Qualcomm Single-wire Serial Bus Interface (SSBI)"
+	depends on HAS_MSM_SSBI
+	help
+	  If you say yes to this option, support will be included for the
+	  built-in SSBI interface on Qualcomm MSM family processors.
+
+	  This is required for communicating with Qualcomm PMICs and
+	  other devices that have the SSBI interface.
+