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mfd: Make MFD core code Device Tree and IRQ domain aware

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During Device Tree enablement of the ab8500 and db8500-prcmu drivers,
a decision was made to omit registration through the MFD API and use
Device Tree directly. However, because MFD devices have a different
address space and the ab8500 and db8500 both use I2C to communicate,
this causes issues with address translation during execution of
of_platform_populate(). So the solution is to make the MFD core aware
of Device Tree and have it assign the correct node pointers instead.

To make this work the MFD core also needs to be awere of IRQ domains,
as Device Tree insists on IRQ domain compatibility. So, instead of
providing an irq-base via platform code, in the DT case we simply
look up the IRQ domain and map to the correct virtual IRQ.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Lee Jones 2012-06-29 19:01:03 +02:00 committed by Samuel Ortiz
parent 822672a7b4
commit c94bb233a9
3 changed files with 28 additions and 4 deletions
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1
drivers/mfd/Kconfig
View File

@ -7,6 +7,7 @@ menu "Multifunction device drivers"
config MFD_CORE
tristate
select IRQ_DOMAIN
default n
config MFD_88PM860X

30
drivers/mfd/mfd-core.c
View File

@ -18,6 +18,8 @@
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/irqdomain.h>
#include <linux/of.h>
int mfd_cell_enable(struct platform_device *pdev)
{
@ -76,6 +78,8 @@ static int mfd_add_device(struct device *parent, int id,
{
struct resource *res;
struct platform_device *pdev;
struct device_node *np = NULL;
struct irq_domain *domain = NULL;
int ret = -ENOMEM;
int r;
@ -89,6 +93,16 @@ static int mfd_add_device(struct device *parent, int id,
pdev->dev.parent = parent;
if (parent->of_node && cell->of_compatible) {
for_each_child_of_node(parent->of_node, np) {
if (of_device_is_compatible(np, cell->of_compatible)) {
pdev->dev.of_node = np;
domain = irq_find_host(parent->of_node);
break;
}
}
}
if (cell->pdata_size) {
ret = platform_device_add_data(pdev,
cell->platform_data, cell->pdata_size);
@ -112,10 +126,18 @@ static int mfd_add_device(struct device *parent, int id,
res[r].end = mem_base->start +
cell->resources[r].end;
} else if (cell->resources[r].flags & IORESOURCE_IRQ) {
res[r].start = irq_base +
cell->resources[r].start;
res[r].end = irq_base +
cell->resources[r].end;
if (domain) {
/* Unable to create mappings for IRQ ranges. */
WARN_ON(cell->resources[r].start !=
cell->resources[r].end);
res[r].start = res[r].end = irq_create_mapping(
domain, cell->resources[r].start);
} else {
res[r].start = irq_base +
cell->resources[r].start;
res[r].end = irq_base +
cell->resources[r].end;
}
} else {
res[r].parent = cell->resources[r].parent;
res[r].start = cell->resources[r].start;

1
include/linux/mfd/core.h
View File

@ -36,6 +36,7 @@ struct mfd_cell {
/* platform data passed to the sub devices drivers */
void *platform_data;
size_t pdata_size;
const char *of_compatible;
/*
* These resources can be specified relative to the parent device.