mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-04 02:20:25 +00:00
bf802f5d54
This patch extends pmic_bind_children prefix matching. In addition to the node name the property regulator-name is used while trying to match prefixes. This allows assigning different drivers to regulator nodes named regulator@1 and regulator@10 for example. I have discarded the idea of using other properties then regulator-name as I do not see any benefit in using property compatible or even regulator-compatible. Of course I am open to change this if there are good reasons to do so. Signed-off-by: Felix Brack <fb@ltec.ch> Reviewed-by: Simon Glass <sjg@chromium.org>
63 lines
2.7 KiB
Text
63 lines
2.7 KiB
Text
Voltage/Current regulator
|
|
|
|
Binding:
|
|
The regulator devices don't use the "compatible" property. The binding is done
|
|
by the prefix of regulator node's name, or, if this fails, by the prefix of the
|
|
regulator's "regulator-name" property. Usually the pmic I/O driver will provide
|
|
the array of 'struct pmic_child_info' with the prefixes and compatible drivers.
|
|
The bind is done by calling function: pmic_bind_childs().
|
|
Example drivers:
|
|
pmic: drivers/power/pmic/max77686.c
|
|
regulator: drivers/power/regulator/max77686.c
|
|
|
|
For the node name e.g.: "prefix[:alpha:]num { ... }":
|
|
- the driver prefix should be: "prefix" - case sensitive
|
|
- the node name's "num" is set as "dev->driver_data" on bind
|
|
|
|
Example the prefix "ldo" will pass for: "ldo1", "ldo@1", "ldoreg@1, ...
|
|
|
|
Binding by means of the node's name is preferred. However if the node names
|
|
would produce ambiguous prefixes (like "regulator@1" and "regualtor@11") and you
|
|
can't or do not want to change them then binding against the "regulator-name"
|
|
property is possible. The syntax for the prefix of the "regulator-name" property
|
|
is the same as the one for the regulator's node name.
|
|
Use case: a regulator named "regulator@1" to be bound to a driver named
|
|
"LDO_DRV" and a regulator named "regualator@11" to be bound to an other driver
|
|
named "BOOST_DRV". Using prefix "regualtor@1" for driver matching would load
|
|
the same driver for both regulators, hence the prefix is ambiguous.
|
|
|
|
Optional properties:
|
|
- regulator-name: a string, required by the regulator uclass, used for driver
|
|
binding if binding by node's name prefix fails
|
|
- regulator-min-microvolt: a minimum allowed Voltage value
|
|
- regulator-max-microvolt: a maximum allowed Voltage value
|
|
- regulator-min-microamp: a minimum allowed Current value
|
|
- regulator-max-microamp: a maximum allowed Current value
|
|
- regulator-always-on: regulator should never be disabled
|
|
- regulator-boot-on: enabled by bootloader/firmware
|
|
|
|
Note
|
|
The "regulator-name" constraint is used for setting the device's uclass
|
|
platform data '.name' field. And the regulator device name is set from
|
|
it's node name. If "regulator-name" is not provided in dts, node name
|
|
is chosen for setting the device's uclass platform data '.name' field.
|
|
|
|
Other kernel-style properties, are currently not used.
|
|
|
|
Note:
|
|
For the regulator autoset from constraints, the framework expects that:
|
|
- regulator-min-microvolt is equal to regulator-max-microvolt
|
|
- regulator-min-microamp is equal to regulator-max-microamp
|
|
- regulator-always-on or regulator-boot-on is set
|
|
|
|
Example:
|
|
ldo0 {
|
|
/* Optional */
|
|
regulator-name = "VDDQ_EMMC_1.8V";
|
|
regulator-min-microvolt = <1800000>;
|
|
regulator-max-microvolt = <1800000>;
|
|
regulator-min-microamp = <100000>;
|
|
regulator-max-microamp = <100000>;
|
|
regulator-always-on;
|
|
regulator-boot-on;
|
|
};
|