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Subject[PATCH v7 1/5] mfd: mxs-lradc: Add support for mxs-lradc MFD
Add core files for mxs-lradc MFD driver.

Note: this patch won't compile in iio/testing without this patch:
a8f447be8056 ("mfd: Add resource managed APIs for mfd_add_devices")

Signed-off-by: Ksenija Stanojevic <>
Changes in v7:
- define macros ADC_CELL and TSC_CELL
- remove one cell and dynamically set them in the switch()
- fail in the touchscreen driver instead of mfd driver if
hardware doesn't contain a touchscreen

Changes in v6:
- update copyright
- add kernel-doc header for struct mxs-lradc
- add error message
- change EINVAL to ENODEV
- use PLATFORM_DEVID_NONE instead -1
- cosmetic fixes

Changes in v5:
- don't pass ioreammaped adress to platform cells
- move comment outside of struct mxs_lradc
- change type of argument in mxs_lradc_reg_set, mxs_lradc_reg_clear,
mxs_lradc_reg_wrt (struct mxs_lradc * -> void __iomem *)

Changes in v4:
- update copyright
- remove mxs_lradc_add_device function
- use struct mfd_cell in static form
- improve spacing
- remove unnecessary comment
- remove platform_get_irq
- remove touch_ret and use ret instead
- rename use_touchscreen to touchscreen_wire
- use goto statements
- remove irq[13], irq_count and irq_name from struct mxs_lradc
- remove all defines from inside the struct definition

Changes in v3:
- add note to commit message
- move switch statement into if(touch_ret == 0) branch

Changes in v2:
- do not change spacing in Kconfig
- make struct mfd_cell part of struct mxs_lradc
- use switch instead of if in mxs_lradc_irq_mask
- use only necessary header files in mxs_lradc.h
- use devm_mfd_add_device
- use separate function to register mfd device
- change licence to GPL
- add copyright

drivers/mfd/Kconfig | 17 +++++++++++++++++
drivers/mfd/Makefile | 1 +
2 files changed, 18 insertions(+)

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 2d1fb64..188c7d1 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -308,6 +308,23 @@ config MFD_MC13XXX_I2C
Select this if your MC13xxx is connected via an I2C bus.

+ tristate "Freescale i.MX23/i.MX28 LRADC"
+ depends on ARCH_MXS || COMPILE_TEST
+ select MFD_CORE
+ select STMP_DEVICE
+ help
+ Say yes here to build support for the Low Resolution
+ Analog-to-Digital Converter (LRADC) found on the i.MX23 and i.MX28
+ processors. This driver provides common support for accessing the
+ device, additional drivers must be enabled in order to use the
+ functionality of the device:
+ mxs-lradc-adc for ADC readings
+ mxs-lradc-ts for touchscreen support
+ This driver can also be built as a module. If so, the module will be
+ called mxs-lradc.
config MFD_MX25_TSADC
tristate "Freescale i.MX25 integrated Touchscreen and ADC unit"
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 2ba3ba3..c9f9c80 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -207,3 +207,4 @@ obj-$(CONFIG_INTEL_SOC_PMIC) += intel-soc-pmic.o
obj-$(CONFIG_MFD_MT6397) += mt6397-core.o

obj-$(CONFIG_MFD_ALTERA_A10SR) += altera-a10sr.o
+obj-$(CONFIG_MFD_MXS_LRADC) += mxs-lradc.o
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