irqchip support for Cirrus Logic Madera codecs

This adds the support for the interrupt controller on the Cirrus Logic Madera codecs. The irqchip patch has dependencies on the MFD tree.

Lee - can you take both these through the MFD tree? The irqchip patch has dependencies on headers in MFD that aren't upstream yet so submitting it to the irqchip tree breaks that tree.

Richard Fitzgerald (2):
mfd: madera: Add irqchip data pointer into struct madera
irqchip: Add driver for Cirrus Logic Madera codecs

 MAINTAINERS                        |   2 +
 drivers/irqchip/Kconfig            |   3 +
 drivers/irqchip/Makefile           |   1 +
 drivers/irqchip/irq-madera.c       | 256 +++++++++++++++++++++++++++++++++++++
 include/linux/irqchip/irq-madera.h | 132 +++++++++++++++++++
 include/linux/mfd/madera/core.h    |   2 +
 6 files changed, 396 insertions(+)
 create mode 100644 drivers/irqchip/irq-madera.c
 create mode 100644 include/linux/irqchip/irq-madera.h

2.11.0

Put the pointer to struct regmap_irq_chip_data into the parent mfd structure so that the child irqchip driver does not need a trivial private structure to store only this pointer. As the irqchip child driver already has a pointer to the parent struct madera it can use that to store the pointer. This also means that the irqchip driver does not need a double-indirection from its local struct to get at the parent struct madera.

---
 include/linux/mfd/madera/core.h | 2 ++
 1 file changed, 2 insertions(+)

index c332681848ef..fe69c0f4398f 100644
@@ -148,6 +148,7 @@ struct snd_soc_dapm_context;
  * @internal_dcvdd:	true if DCVDD is supplied from the internal LDO1
  * @pdata:		our pdata
  * @irq_dev:		the irqchip child driver device
+ * @irq_data:		pointer to irqchip data for the child irqchip driver
  * @irq:		host irq number from SPI or I2C configuration
  * @out_clamp:		indicates output clamp state for each analogue output
  * @out_shorted:	indicates short circuit state for each analogue output

@@ -175,6 +176,7 @@ struct madera {
 	struct madera_pdata pdata;
 
 	struct device *irq_dev;
+	struct regmap_irq_chip_data *irq_data;
 	int irq;
 
 	unsigned int num_micbias;

2.11.0

For my own reference:

Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

The Cirrus Logic Madera codecs (Cirrus Logic CS47L35/85/90/91 and WM1840) are highly complex devices containing up to 7 programmable DSPs and many other internal sources of interrupts plus a number of GPIOs that can be used as interrupt inputs. The large number (>150) of internal interrupt sources are managed by an on-board interrupt controller.

This driver provides the handling for the interrupt controller. As the codec is accessed via regmap, we can make use of the generic IRQ functionality from regmap to do most of the work. Only around half of the possible interrupt source are currently of interest from the driver so only this subset is defined. Others can be added in future if needed.

The KConfig options are not user-configurable because this driver is mandatory so is automatically included when the parent MFD driver is selected.

---
Can this patch go through the MFD tree? It has dependencies on headers from MFD that aren't upstream yet.

---
 MAINTAINERS                        |   2 +
 drivers/irqchip/Kconfig            |   3 +
 drivers/irqchip/Makefile           |   1 +
 drivers/irqchip/irq-madera.c       | 256 +++++++++++++++++++++++++++++++++++++
 include/linux/irqchip/irq-madera.h | 132 +++++++++++++++++++
 5 files changed, 394 insertions(+)
 create mode 100644 drivers/irqchip/irq-madera.c
 create mode 100644 include/linux/irqchip/irq-madera.h

index 187b8a164083..c55e8bc485dc 100644
@@ -3594,8 +3594,10 @@ W:	https://github.com/CirrusLogic/linux-drivers/wiki
 S:	Supported
 F:	Documentation/devicetree/bindings/mfd/madera.txt
 F:	Documentation/devicetree/bindings/pinctrl/cirrus,madera-pinctrl.txt
+F:	include/linux/irqchip/irq-madera*
 F:	include/linux/mfd/madera/*
 F:	drivers/gpio/gpio-madera*
+F:	drivers/irqchip/irq-madera*
 F:	drivers/mfd/madera*
 F:	drivers/mfd/cs47l*
 F:	drivers/pinctrl/cirrus/*

index 96451b581452..43d953cbcfd7 100644
@@ -150,6 +150,9 @@ config IMGPDC_IRQ
 	select GENERIC_IRQ_CHIP
 	select IRQ_DOMAIN
 
+config MADERA_IRQ
+	tristate
+
 config IRQ_MIPS_CPU
 	bool
 	select GENERIC_IRQ_CHIP

index b822199445ff..f839c4f2ed39 100644
@@ -89,3 +89,4 @@ obj-$(CONFIG_GOLDFISH_PIC) 		+= irq-goldfish-pic.o
 obj-$(CONFIG_NDS32)			+= irq-ativic32.o
 obj-$(CONFIG_QCOM_PDC)			+= qcom-pdc.o
 obj-$(CONFIG_SIFIVE_PLIC)		+= irq-sifive-plic.o
+obj-$(CONFIG_MADERA_IRQ)		+= irq-madera.o

2.11.0