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syscon: dm: Add a new method to get a regmap from DTS

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syscon_regmap_lookup_by_phandle() can be used to get the regmap of a syscon
device from a reference in the DTS. It operates similarly to the linux
version of the namesake function.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Jean-Jacques Hiblot 2018-11-29 10:57:37 +01:00 committed by Marek Vasut
parent 4d3825c191
commit 6c3af1f24e
4 changed files with 69 additions and 2 deletions
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6
arch/sandbox/dts/test.dts
View file

@ -460,6 +460,8 @@
test4 {
compatible = "denx,u-boot-probe-test";
first-syscon = <&syscon0>;
second-sys-ctrl = <&another_system_controller>;
};
};
@ -540,12 +542,12 @@
};
};
syscon@0 {
syscon0: syscon@0 {
compatible = "sandbox,syscon0";
reg = <0x10 16>;
};
syscon@1 {
another_system_controller: syscon@1 {
compatible = "sandbox,syscon1";
reg = <0x20 5
0x28 6

23
drivers/core/syscon-uclass.c
View file

@ -53,6 +53,29 @@ static int syscon_pre_probe(struct udevice *dev)
#endif
}
struct regmap *syscon_regmap_lookup_by_phandle(struct udevice *dev,
const char *name)
{
struct udevice *syscon;
struct regmap *r;
int err;
err = uclass_get_device_by_phandle(UCLASS_SYSCON, dev,
name, &syscon);
if (err) {
dev_dbg(dev, "unable to find syscon device\n");
return ERR_PTR(err);
}
r = syscon_get_regmap(syscon);
if (!r) {
dev_dbg(dev, "unable to find regmap\n");
return ERR_PTR(-ENODEV);
}
return r;
}
int syscon_get_by_driver_data(ulong driver_data, struct udevice **devp)
{
struct udevice *dev;

13
include/syscon.h
View file

@ -73,6 +73,19 @@ int syscon_get_by_driver_data(ulong driver_data, struct udevice **devp);
*/
struct regmap *syscon_get_regmap_by_driver_data(ulong driver_data);
/**
* syscon_regmap_lookup_by_phandle() - Look up a controller by a phandle
*
* This operates by looking up the given name in the device (device
* tree property) of the device using the system controller.
*
* @dev: Device using the system controller
* @name: Name of property referring to the system controller
* @return A pointer to the regmap if found, ERR_PTR(-ve) on error
*/
struct regmap *syscon_regmap_lookup_by_phandle(struct udevice *dev,
const char *name);
/**
* syscon_get_first_range() - get the first memory range from a syscon regmap
*

29
test/dm/syscon.c
View file

@ -6,6 +6,7 @@
#include <common.h>
#include <dm.h>
#include <syscon.h>
#include <regmap.h>
#include <asm/test.h>
#include <dm/test.h>
#include <test/ut.h>
@ -43,3 +44,31 @@ static int dm_test_syscon_by_driver_data(struct unit_test_state *uts)
return 0;
}
DM_TEST(dm_test_syscon_by_driver_data, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
/* Test system controller by phandle */
static int dm_test_syscon_by_phandle(struct unit_test_state *uts)
{
struct udevice *dev;
struct regmap *map;
ut_assertok(uclass_get_device_by_name(UCLASS_TEST_PROBE, "test4",
&dev));
ut_assertok_ptr(syscon_regmap_lookup_by_phandle(dev, "first-syscon"));
map = syscon_regmap_lookup_by_phandle(dev, "first-syscon");
ut_assert(map);
ut_assert(!IS_ERR(map));
ut_asserteq(1, map->range_count);
ut_assertok_ptr(syscon_regmap_lookup_by_phandle(dev,
"second-sys-ctrl"));
map = syscon_regmap_lookup_by_phandle(dev, "second-sys-ctrl");
ut_assert(map);
ut_assert(!IS_ERR(map));
ut_asserteq(4, map->range_count);
ut_assert(IS_ERR(syscon_regmap_lookup_by_phandle(dev, "not-present")));
return 0;
}
DM_TEST(dm_test_syscon_by_phandle, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);