power sequencing updates for v6.12-rc1

- add support for the new PMU variant inside the WCN6855 chipset
 - add documentation for the subsystem
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Merge tag 'pwrseq-updates-for-v6.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux

Pull power sequencing updates from Bartosz Golaszewski:
 "There's one change adding support for a new PMU model and another
  adding documentation for the subsystem which probably should have been
  part of the initial commit but better late than never:

   - add support for the new PMU variant inside the WCN6855 chipset

   - add documentation for the subsystem"

* tag 'pwrseq-updates-for-v6.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux:
  Documentation: add a driver API doc for the power sequencing subsystem
  power: sequencing: qcom-wcn: add support for the WCN6855 PMU

Documentation/driver-api/index.rst

@@ -124,6 +124,7 @@ Subsystem-specific APIs
    pps
    ptp
    pwm
+   pwrseq
    regulator
    reset
    rfkill

Documentation/driver-api/pwrseq.rst

@@ -0,0 +1,95 @@
+.. SPDX-License-Identifier: GPL-2.0-only
+.. Copyright 2024 Linaro Ltd.
+
+====================
+Power Sequencing API
+====================
+
+:Author: Bartosz Golaszewski
+
+Introduction
+============
+
+This framework is designed to abstract complex power-up sequences that are
+shared between multiple logical devices in the linux kernel.
+
+The intention is to allow consumers to obtain a power sequencing handle
+exposed by the power sequence provider and delegate the actual requesting and
+control of the underlying resources as well as to allow the provider to
+mitigate any potential conflicts between multiple users behind the scenes.
+
+Glossary
+--------
+
+The power sequencing API uses a number of terms specific to the subsystem:
+
+Unit
+
+    A unit is a discreet chunk of a power sequence. For instance one unit may
+    enable a set of regulators, another may enable a specific GPIO. Units can
+    define dependencies in the form of other units that must be enabled before
+    it itself can be.
+
+Target
+
+    A target is a set of units (composed of the "final" unit and its
+    dependencies) that a consumer selects by its name when requesting a handle
+    to the power sequencer. Via the dependency system, multiple targets may
+    share the same parts of a power sequence but ignore parts that are
+    irrelevant.
+
+Descriptor
+
+    A handle passed by the pwrseq core to every consumer that serves as the
+    entry point to the provider layer. It ensures coherence between different
+    users and keeps reference counting consistent.
+
+Consumer interface
+==================
+
+The consumer API is aimed to be as simple as possible. The driver interested in
+getting a descriptor from the power sequencer should call pwrseq_get() and
+specify the name of the target it wants to reach in the sequence after calling
+pwrseq_power_up(). The descriptor can be released by calling pwrseq_put() and
+the consumer can request the powering down of its target with
+pwrseq_power_off(). Note that there is no guarantee that pwrseq_power_off()
+will have any effect as there may be multiple users of the underlying resources
+who may keep them active.
+
+Provider interface
+==================
+
+The provider API is admittedly not nearly as straightforward as the one for
+consumers but it makes up for it in flexibility.
+
+Each provider can logically split the power-up sequence into descrete chunks
+(units) and define their dependencies. They can then expose named targets that
+consumers may use as the final point in the sequence that they wish to reach.
+
+To that end the providers fill out a set of configuration structures and
+register with the pwrseq subsystem by calling pwrseq_device_register().
+
+Dynamic consumer matching
+-------------------------
+
+The main difference between pwrseq and other linux kernel providers is the
+mechanism for dynamic matching of consumers and providers. Every power sequence
+provider driver must implement the `match()` callback and pass it to the pwrseq
+core when registering with the subsystems.
+
+When a client requests a sequencer handle, the core will call this callback for
+every registered provider and let it flexibly figure out whether the proposed
+client device is indeed its consumer. For example: if the provider binds to the
+device-tree node representing a power management unit of a chipset and the
+consumer driver controls one of its modules, the provider driver may parse the
+relevant regulator supply properties in device tree and see if they lead from
+the PMU to the consumer.
+
+API reference
+=============
+
+.. kernel-doc:: include/linux/pwrseq/provider.h
+   :internal:
+
+.. kernel-doc:: drivers/power/sequencing/core.c
+   :export:

MAINTAINERS

@@ -18331,6 +18331,7 @@ M:	Bartosz Golaszewski <brgl@bgdev.pl>
 L:	linux-pm@vger.kernel.org
 S:	Maintained
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux.git
+F:	Documentation/driver-api/pwrseq.rst
 F:	drivers/power/sequencing/
 F:	include/linux/pwrseq/
 

drivers/power/sequencing/pwrseq-qcom-wcn.c

@@ -198,6 +198,13 @@ static const struct pwrseq_qcom_wcn_pdata pwrseq_qca6390_of_data = {
 	.gpio_enable_delay_ms = 100,
 };
 
+static const struct pwrseq_qcom_wcn_pdata pwrseq_wcn6855_of_data = {
+	.vregs = pwrseq_qca6390_vregs,
+	.num_vregs = ARRAY_SIZE(pwrseq_qca6390_vregs),
+	.pwup_delay_ms = 50,
+	.gpio_enable_delay_ms = 5,
+};
+
 static const char *const pwrseq_wcn7850_vregs[] = {
 	"vdd",
 	"vddio",
@@ -321,6 +328,10 @@ static const struct of_device_id pwrseq_qcom_wcn_of_match[] = {
 		.compatible = "qcom,qca6390-pmu",
 		.data = &pwrseq_qca6390_of_data,
 	},
+	{
+		.compatible = "qcom,wcn6855-pmu",
+		.data = &pwrseq_wcn6855_of_data,
+	},
 	{
 		.compatible = "qcom,wcn7850-pmu",
 		.data = &pwrseq_wcn7850_of_data,