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dm: syscon: Allow finding devices by driver data

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We have a way to find a regmap by its syscon driver data value. Add the same
for syscon itself.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2016-01-17 16:11:08 -07:00 committed by Bin Meng
parent 907eed2ce3
commit ac94b7bcbe
3 changed files with 50 additions and 12 deletions
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31
drivers/core/syscon-uclass.c
View file

@ -32,7 +32,7 @@ static int syscon_pre_probe(struct udevice *dev)
return regmap_init_mem(dev, &priv->regmap);
}
struct regmap *syscon_get_regmap_by_driver_data(ulong driver_data)
int syscon_get_by_driver_data(ulong driver_data, struct udevice **devp)
{
struct udevice *dev;
struct uclass *uc;
@ -40,22 +40,29 @@ struct regmap *syscon_get_regmap_by_driver_data(ulong driver_data)
ret = uclass_get(UCLASS_SYSCON, &uc);
if (ret)
return ERR_PTR(ret);
return ret;
uclass_foreach_dev(dev, uc) {
if (dev->driver_data == driver_data) {
struct syscon_uc_info *priv;
int ret;
ret = device_probe(dev);
if (ret)
return ERR_PTR(ret);
priv = dev_get_uclass_priv(dev);
return priv->regmap;
*devp = dev;
return device_probe(dev);
}
}
return ERR_PTR(-ENODEV);
return -ENODEV;
}
struct regmap *syscon_get_regmap_by_driver_data(ulong driver_data)
{
struct syscon_uc_info *priv;
struct udevice *dev;
int ret;
ret = syscon_get_by_driver_data(driver_data, &dev);
if (ret)
return ERR_PTR(ret);
priv = dev_get_uclass_priv(dev);
return priv->regmap;
}
void *syscon_get_first_range(ulong driver_data)

14
include/syscon.h
View file

@ -32,6 +32,20 @@ struct syscon_ops {
*/
struct regmap *syscon_get_regmap(struct udevice *dev);
/**
* syscon_get_regmap_by_driver_data() - Look up a controller by its ID
*
* Each system controller can be accessed by its driver data, which is
* assumed to be unique through the scope of all system controllers that
* are in use. This function looks up the controller given this driver data.
*
* @driver_data: Driver data value to look up
* @devp: Returns the controller correponding to @driver_data
* @return 0 on success, -ENODEV if the ID was not found, or other -ve error
* code
*/
int syscon_get_by_driver_data(ulong driver_data, struct udevice **devp);
/**
* syscon_get_regmap_by_driver_data() - Look up a controller by its ID
*

17
test/dm/syscon.c
View file

@ -29,3 +29,20 @@ static int dm_test_syscon_base(struct unit_test_state *uts)
return 0;
}
DM_TEST(dm_test_syscon_base, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
/* Test system controller finding */
static int dm_test_syscon_by_driver_data(struct unit_test_state *uts)
{
struct udevice *dev;
ut_assertok(syscon_get_by_driver_data(SYSCON0, &dev));
ut_asserteq(SYSCON0, dev->driver_data);
ut_assertok(syscon_get_by_driver_data(SYSCON1, &dev));
ut_asserteq(SYSCON1, dev->driver_data);
ut_asserteq(-ENODEV, syscon_get_by_driver_data(2, &dev));
return 0;
}
DM_TEST(dm_test_syscon_by_driver_data, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);