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mfd: Allow mapping regulator supplies to MFD device from children

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Occasionally, it is useful to map supplies from a child device onto the
MFD device. A typical usecase for this would be if the MFD device is
represented as a single node in device tree. All supplies will be
defined in device tree as existing on the MFD device. When a child
depends on frameworks which might have no knowledge of MFD to lookup
supplies on its behalf the supply will not be found.

This patch adds a list of supplies that should be looked up on the
parent rather than the child as part of the mfd_cell structure.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Charles Keepax 2013-10-15 20:14:21 +01:00 committed by Mark Brown
parent a06ccd9c37
commit 7fcd427465
2 changed files with 23 additions and 5 deletions
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22
drivers/mfd/mfd-core.c
View File

@ -20,6 +20,7 @@
#include <linux/module.h>
#include <linux/irqdomain.h>
#include <linux/of.h>
#include <linux/regulator/consumer.h>
static struct device_type mfd_dev_type = {
.name = "mfd_device",
@ -99,6 +100,13 @@ static int mfd_add_device(struct device *parent, int id,
pdev->dev.dma_mask = parent->dma_mask;
pdev->dev.dma_parms = parent->dma_parms;
ret = devm_regulator_bulk_register_supply_alias(
&pdev->dev, cell->parent_supplies,
parent, cell->parent_supplies,
cell->num_parent_supplies);
if (ret < 0)
goto fail_res;
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)) {
@ -112,12 +120,12 @@ static int mfd_add_device(struct device *parent, int id,
ret = platform_device_add_data(pdev,
cell->platform_data, cell->pdata_size);
if (ret)
goto fail_res;
goto fail_alias;
}
ret = mfd_platform_add_cell(pdev, cell);
if (ret)
goto fail_res;
goto fail_alias;
for (r = 0; r < cell->num_resources; r++) {
res[r].name = cell->resources[r].name;
@ -152,17 +160,17 @@ static int mfd_add_device(struct device *parent, int id,
if (!cell->ignore_resource_conflicts) {
ret = acpi_check_resource_conflict(&res[r]);
if (ret)
goto fail_res;
goto fail_alias;
}
}
ret = platform_device_add_resources(pdev, res, cell->num_resources);
if (ret)
goto fail_res;
goto fail_alias;
ret = platform_device_add(pdev);
if (ret)
goto fail_res;
goto fail_alias;
if (cell->pm_runtime_no_callbacks)
pm_runtime_no_callbacks(&pdev->dev);
@ -171,6 +179,10 @@ static int mfd_add_device(struct device *parent, int id,
return 0;
fail_alias:
devm_regulator_bulk_unregister_supply_alias(&pdev->dev,
cell->parent_supplies,
cell->num_parent_supplies);
fail_res:
kfree(res);
fail_device:

6
include/linux/mfd/core.h
View File

@ -59,6 +59,12 @@ struct mfd_cell {
* pm_runtime_no_callbacks().
*/
bool pm_runtime_no_callbacks;
/* A list of regulator supplies that should be mapped to the MFD
* device rather than the child device when requested
*/
const char **parent_supplies;
int num_parent_supplies;
};
/*