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
---
Changes in v4: - Fix word missing in commit log
Changes in v3: - in syscon_regmap_lookup_by_phandle(), use dev_dbg() instead of printf() - added unit test for syscon_regmap_lookup_by_phandle()
Changes in v2: None
arch/sandbox/dts/test.dts | 6 ++++-- drivers/core/syscon-uclass.c | 23 +++++++++++++++++++++++ include/syscon.h | 13 +++++++++++++ test/dm/syscon.c | 29 +++++++++++++++++++++++++++++ 4 files changed, 69 insertions(+), 2 deletions(-)
diff --git a/arch/sandbox/dts/test.dts b/arch/sandbox/dts/test.dts index 06d0e8c..369002e 100644 --- a/arch/sandbox/dts/test.dts +++ b/arch/sandbox/dts/test.dts @@ -311,6 +311,8 @@
test4 { compatible = "denx,u-boot-probe-test"; + first-syscon = <&syscon0>; + second-sys-ctrl = <&another_system_controller>; }; };
@@ -380,12 +382,12 @@ }; };
- syscon@0 { + syscon0: syscon@0 { compatible = "sandbox,syscon0"; reg = <0x10 4>; };
- syscon@1 { + another_system_controller: syscon@1 { compatible = "sandbox,syscon1"; reg = <0x20 5 0x28 6 diff --git a/drivers/core/syscon-uclass.c b/drivers/core/syscon-uclass.c index a69937e..739fddd 100644 --- a/drivers/core/syscon-uclass.c +++ b/drivers/core/syscon-uclass.c @@ -45,6 +45,29 @@ 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; diff --git a/include/syscon.h b/include/syscon.h index 5d52b1c..23d257a 100644 --- a/include/syscon.h +++ b/include/syscon.h @@ -74,6 +74,19 @@ 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 * * @driver_data: Driver data value to look up diff --git a/test/dm/syscon.c b/test/dm/syscon.c index c40f5fc..6f93e63 100644 --- a/test/dm/syscon.c +++ b/test/dm/syscon.c @@ -7,6 +7,7 @@ #include <common.h> #include <dm.h> #include <syscon.h> +#include <regmap.h> #include <asm/test.h> #include <dm/test.h> #include <test/ut.h> @@ -46,3 +47,31 @@ 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)); + if (!dev || IS_ERR(dev)) + return -ENODEV; + + ut_assertok_ptr(syscon_regmap_lookup_by_phandle(dev, "first-syscon")); + map = syscon_regmap_lookup_by_phandle(dev, "first-syscon"); + if (map && !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-controller"); + if (map && !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);