MFD and GPIO for STA2X11

These two patches introduce multi-function device and GPIO support for the STA2X11 I/O Hub. It's an RFC for both as explained below.

- I think the MFD driver is ok. This MFD_STA2X11 config symbol is autoselected by CONFIG_STA2X11, which is pending in the "x86: initial support for sta2x11" patch, for which I need to send V2 later today, with some minor fixes. Similarly, <asm/sta2x11.h> is not upstream yet, so I'll need to resend later, I suppose.

- The GPIO patch has a quirk: I chose to register a single irq chip for 128 interrupts but the generic irq_chip only support 32 interrupts. I'm sure the hack I did (request the irq descs myself) is not good, but what is the best approach here? Using 4 generic irq chips or defining my own, non-generic one?

Thanks a lot
/alessandro

Alessandro Rubini (2):
mfd: Add driver for STA2X11 MFD block
gpio: add STA2X11 GPIO block

 drivers/gpio/Kconfig            |    9 +
 drivers/gpio/Makefile           |    1 +
 drivers/gpio/gpio-sta2x11.c     |  380 +++++++++++++++++++++++++++++++
 drivers/mfd/Kconfig             |    6 +
 drivers/mfd/Makefile            |    1 +
 drivers/mfd/sta2x11-mfd.c       |  470 +++++++++++++++++++++++++++++++++++++++
 include/linux/mfd/sta2x11-mfd.h |  186 +++++++++++++++
 7 files changed, 1053 insertions(+), 0 deletions(-)
 create mode 100644 drivers/gpio/gpio-sta2x11.c
 create mode 100644 drivers/mfd/sta2x11-mfd.c
 create mode 100644 include/linux/mfd/sta2x11-mfd.h

1.7.7.2

This is an RFC as described in the cover letter 0/2

---
 drivers/mfd/Kconfig             |    6 +
 drivers/mfd/Makefile            |    1 +
 drivers/mfd/sta2x11-mfd.c       |  470 +++++++++++++++++++++++++++++++++++++++
 include/linux/mfd/sta2x11-mfd.h |  186 +++++++++++++++
 4 files changed, 663 insertions(+), 0 deletions(-)
 create mode 100644 drivers/mfd/sta2x11-mfd.c
 create mode 100644 include/linux/mfd/sta2x11-mfd.h

index cd13e9f..36bee4a 100644
@@ -830,6 +830,12 @@ config MFD_INTEL_MSIC
 	  Passage) chip. This chip embeds audio, battery, GPIO, etc.
 	  devices used in Intel Medfield platforms.
 
+config MFD_STA2X11
+	bool "STA2X11 multi function device support"
+	depends on STA2X11
+	select MFD_CORE
+	select GPIO_STA2X11
+
 endmenu
 endif
 

index b953bab..c5db71b 100644
@@ -15,6 +15,7 @@ obj-$(CONFIG_MFD_DAVINCI_VOICECODEC)	+= davinci_voicecodec.o
 obj-$(CONFIG_MFD_DM355EVM_MSP)	+= dm355evm_msp.o
 obj-$(CONFIG_MFD_TI_SSP)	+= ti-ssp.o
 
+obj-$(CONFIG_MFD_STA2X11)	+= sta2x11-mfd.o
 obj-$(CONFIG_MFD_STMPE)		+= stmpe.o
 obj-$(CONFIG_STMPE_I2C)		+= stmpe-i2c.o
 obj-$(CONFIG_STMPE_SPI)		+= stmpe-spi.o

1.7.7.2

This introduces 128 gpio bits (for each device) and with interrupt support. It is tested and working, but it's still an RFC.

It still misses the alternate-function and pull-up/pull-down support. I don't know if it should be a different patch or merged in this the next time I submit.

Moreover, this is an RFC as described in the cover letter 0/2

---
 drivers/gpio/Kconfig        |    9 +
 drivers/gpio/Makefile       |    1 +
 drivers/gpio/gpio-sta2x11.c |  380 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 390 insertions(+), 0 deletions(-)
 create mode 100644 drivers/gpio/gpio-sta2x11.c

index d0c4118..fab6ca7 100644
@@ -149,6 +149,14 @@ config GPIO_PXA
 	help
 	  Say yes here to support the PXA GPIO device
 
+config GPIO_STA2X11
+	bool "STA2x11/ConneXt GPIO support"
+	depends on MFD_STA2X11
+	select GENERIC_IRQ_CHIP
+	help
+	  Say yes here to support the STA2x11/ConneXt GPIO device.
+	  The GPIO module has 128 GPIO pins with alternate functions.
+
 config GPIO_XILINX
 	bool "Xilinx GPIO support"
 	depends on PPC_OF || MICROBLAZE

@@ -489,4 +497,5 @@ config GPIO_TPS65910
 	help
 	  Select this option to enable GPIO driver for the TPS65910
 	  chip family.
+
 endif

index fa10df6..81a28cf 100644
@@ -45,6 +45,7 @@ obj-$(CONFIG_GPIO_RDC321X)	+= gpio-rdc321x.o
 obj-$(CONFIG_PLAT_SAMSUNG)	+= gpio-samsung.o
 obj-$(CONFIG_ARCH_SA1100)	+= gpio-sa1100.o
 obj-$(CONFIG_GPIO_SCH)		+= gpio-sch.o
+obj-$(CONFIG_GPIO_STA2X11)	+= gpio-sta2x11.o
 obj-$(CONFIG_GPIO_STMPE)	+= gpio-stmpe.o
 obj-$(CONFIG_GPIO_SX150X)	+= gpio-sx150x.o
 obj-$(CONFIG_GPIO_TC3589X)	+= gpio-tc3589x.o

1.7.7.2