mfd: Add Cherry Trail Whiskey Cove PMIC driver

Add mfd driver for Intel CHT Whiskey Cove PMIC, based on various non
upstreamed CHT Whiskey Cove PMIC patches.

This is a somewhat minimal version which adds irqchip support and cells
for: ACPI PMIC opregion support, the i2c-controller driving the external
charger irc and the pwrsrc/extcon block.

Further cells can be added in the future if/when drivers are upstreamed
for them.

[The above patch caused a build error on some archetectures]

From: Arnd Bergmann <arnd@arndb.de>

I ran into a build error on ARM with a platform that has a non-standard
clk implementation:

drivers/clk/clk.o: In function `clk_disable':
clk.c:(.text.clk_disable+0x0): multiple definition of `clk_disable'
arch/arm/mach-omap1/clock.o:clock.c:(.text.clk_disable+0x0): first defined here
drivers/clk/clk.o: In function `clk_enable':
clk.c:(.text.clk_enable+0x0): multiple definition of `clk_enable'
arch/arm/mach-omap1/clock.o:clock.c:(.text.clk_enable+0x0): first defined here

The problem is a device driver that uses 'select COMMON_CLK', which is
generally a bad idea: selecting a subsystem should only be done from
a platform, otherwise we run into circular dependencies. The same driver
also selects 'GPIOLIB' and 'I2C', which has a similar effect.

This turns all three into 'depends on', as it should be.

Finally, we can limit the build to x86, unless we are compile testing.

First patch:
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

Fix for first patch (squashed):
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 2ca88fc4698d..44e7164b5063 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -475,6 +475,22 @@ config INTEL_SOC_PMIC_BXTWC
 	  thermal, charger and related power management functions
 	  on these systems.
 
+config INTEL_SOC_PMIC_CHTWC
+	tristate "Support for Intel Cherry Trail Whiskey Cove PMIC"
+	depends on ACPI && HAS_IOMEM && I2C=y && COMMON_CLK
+	depends on X86 || COMPILE_TEST
+	select MFD_CORE
+	select REGMAP_I2C
+	select REGMAP_IRQ
+	select I2C_DESIGNWARE_PLATFORM
+	help
+	  Select this option to enable support for the Intel Cherry Trail
+	  Whiskey Cove PMIC found on some Intel Cherry Trail systems.
+
+	  This option is a bool as it provides an ACPI OpRegion which must be
+	  available before any devices using it are probed. This option also
+	  causes the designware-i2c driver to be builtin for the same reason.
+
 config MFD_INTEL_LPSS
 	tristate
 	select COMMON_CLK