The Gateworks System Controller (GSC) is an I2C slave controller
implemented with an MSP430 micro-controller whose firmware embeds the
following features:
- I/O expander (16 GPIO's) using PCA955x protocol
- Real Time Clock using DS1672 protocol
- User EEPROM using AT24 protocol
- HWMON using custom protocol
- Interrupt controller with tamper detect, user pushbotton
- Watchdog controller capable of full board power-cycle
- Power Control capable of full board power-cycle
see http://trac.gateworks.com/wiki/gsc for more details
Signed-off-by: Tim Harvey
Acked-for-MFD-by: Lee Jones
---
v10:
- fix typo and gramatical errors in Kconfig and comment block
- drop unused i2c device-id table
- added Lee's ack in s-o-b
v9:
- rebase against 5.7-rc2
- cleanup gsc_powerdown() by using BIT(), put_unaligned_le32(), and avoid
unnecessary assignments
- rename GSC_CTRL_1 SLEEP related defines to simplify
- add better description and sub-module info to driver description
- whitespace changes per review
- remove unused irq_data pointer in ddata
- remove unnecesary i2c_set_clientdata
- use devm_i2c_new_dummy_device to avoid need of free's
- change regsiter definitions to enum
- export gsc_{read,write} instead of sharing them via ddata
v8:
- whitespace fixes
- describe sub-devices in Kconfig
- add error print for invalid command
- update copyright
- use devm_of_platform_populate
- use probe_new
- move hwmon's regmap init to hwmon
v7:
- remove irq from private data struct
v6:
- remove duplicate signature and fix commit log
v5:
- simplify powerdown function
v4:
- remove hwmon max reg check/define
- fix powerdown function
v3:
- rename gsc->gateworks-gsc
- remove uncecessary include for linux/mfd/core.h
- upercase I2C in comments
- remove i2c debug
- remove uncecessary comments
- don't use KBUILD_MODNAME for name
- remove unnecessary v1/v2/v3 tracking
- unregister hwmon i2c adapter on remove
v2:
- change license comment block style
- remove COMPILE_TEST (Randy)
- fixed whitespace issues
- replaced a printk with dev_err
---
MAINTAINERS | 8 ++
drivers/mfd/Kconfig | 15 +++
drivers/mfd/Makefile| 1 +
drivers/mfd/gateworks-gsc.c | 278
include/linux/mfd/gsc.h | 76
5 files changed, 378 insertions(+)
create mode 100644 drivers/mfd/gateworks-gsc.c
create mode 100644 include/linux/mfd/gsc.h
diff --git a/MAINTAINERS b/MAINTAINERS
index 091ec22..c78a014 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -7028,6 +7028,14 @@ F: kernel/futex.c
F: tools/perf/bench/futex*
F: tools/testing/selftests/futex/
+GATEWORKS SYSTEM CONTROLLER (GSC) DRIVER
+M: Tim Harvey
+M: Robert Jones
+S: Maintained
+F: Documentation/devicetree/bindings/mfd/gateworks-gsc.yaml
+F: drivers/mfd/gateworks-gsc.c
+F: include/linux/mfd/gsc.h
+
GASKET DRIVER FRAMEWORK
M: Rob Springer
M: Todd Poynor
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 0a59249..05448e7 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -407,6 +407,21 @@ config MFD_EXYNOS_LPASS
Select this option to enable support for Samsung Exynos Low Power
Audio Subsystem.
+config MFD_GATEWORKS_GSC
+ tristate "Gateworks System Controller"
+ depends on (I2C && OF)
+ select MFD_CORE
+ select REGMAP_I2C
+ select REGMAP_IRQ
+ help
+ Enable support for the Gateworks System Controller (GSC) found
+ on Gateworks Single Board Computers supporting system functions
+ such as push-button monitor, multiple ADC's for voltage and
+ temperature monitoring, fan controller and watchdog monitor.
+ This driver provides common support for accessing the device.
+ Additional drivers must be enabled in order to use the
+ functionality of the device.
+
config MFD_MC13XXX
tristate
depends on (SPI_MASTER || I2C)
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index f935d10..ed433ae 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_MFD_BCM590XX)+= bcm590xx.o
obj-$(CONFIG_MFD_BD9571MWV)+= bd9571mwv.o
obj-$(CONFIG_MFD_CROS_EC_DEV) += cros_ec_dev.o
obj-$(CONFIG_MFD_EXYNOS_LPASS) += exynos-lpass.o
+obj-$(CONFIG_MFD_GATEWORKS_GSC)+= gateworks-gsc.o
obj-$(CONFIG_HTC_PASIC3) += htc-pasic3.o
obj-$(CONFIG_HTC_I2CPLD) += htc-i2cpld.o
diff --git a/drivers/mfd/gateworks-gsc.c b/drivers/mfd/gateworks-gsc.c
new file mode 100644
index ..d43a4dd
--- /dev/null
+++ b/drivers/mfd/gateworks-gsc.c
@@ -0,0 +1,278 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * The Gateworks System Controller (GSC) is a multi-function
+ * device designed for use in Gateworks Single Board Computers.
+ * The control interface is I2C, with an interrupt. The device supports
+ * system functions such as push-button monitoring, multiple ADC's for
+ * voltage and tempera
