[PATCH v1 00/15] create power sequencing subsystem

[PATCH v1 00/15] create power sequencing subsystem

[Dmitry Baryshkov]

This is a proposed power sequencer subsystem. This is a
generification of the MMC pwrseq code. The subsystem tries to abstract
the idea of complex power-up/power-down/reset of the devices.

The primary set of devices that promted me to create this patchset is
the Qualcomm BT+WiFi family of chips. They reside on serial+platform
or serial + SDIO interfaces (older generations) or on serial+PCIe (newer
generations).  They require a set of external voltage regulators to be
powered on and (some of them) have separate WiFi and Bluetooth enable
GPIOs.

The major drawback for now is the lack of proper PCIe integration
At this moment support for PCIe is hacked up to be able to test the
PCIe part of qca6390. Proper PCIe support would require automatically
powering up the devices before the scan basing on the proper device
structure in the device tree. This two last patches are noted as WIP and
are included into the patchset for the purpose of testing WiFi on newer
chips (like qca6390/qca6391).

Changes since RFC v2:
 - Add documentation for the pwrseq code. Document data structures,
   macros and exported functions.
 - Export of_pwrseq_xlate_onecell()
 - Add separate pwrseq_set_drvdata() function to follow the typical API
   design
 - Remove pwrseq_get_optional()/devm_pwrseq_get_optional()
 - Moved code to handle old mmc-pwrseq binding to the MMC patch
 - Split of_pwrseq_xlate_onecell() support to a separate patch

Changes since RFC v1:
 - Provider pwrseq fallback support
 - Implement fallback support in pwrseq_qca.
 - Mmove susclk handling to pwrseq_qca.
 - Significantly simplify hci_qca.c changes, by dropping all legacy
   code. Now hci_qca uses only pwrseq calls to power up/down bluetooth
   parts of the chip.




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[PATCH v1 01/15] dt-bindings: add pwrseq device tree bindings

[Dmitry Baryshkov]

Add device tree bindings for the new power sequencer subsystem.
Consumers would reference pwrseq nodes using "foo-pwrseq" properties.
Providers would use '#pwrseq-cells' property to declare the amount of
cells in the pwrseq specifier.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 .../bindings/power/pwrseq/pwrseq.yaml         | 32 +++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/power/pwrseq/pwrseq.yaml

diff --git a/Documentation/devicetree/bindings/power/pwrseq/pwrseq.yaml b/Documentation/devicetree/bindings/power/pwrseq/pwrseq.yaml
new file mode 100644
index 000000000000..4a8f6c0218bf
--- /dev/null
+++ b/Documentation/devicetree/bindings/power/pwrseq/pwrseq.yaml
@@ -0,0 +1,32 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/power/pwrseq/pwrseq.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Power Sequencer devices
+
+maintainers:
+  - Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
+
+properties:
+  "#powerseq-cells":
+    description:
+      Number of cells in a pwrseq specifier.
+
+patternProperties:
+  ".*-pwrseq$":
+    description: Power sequencer supply phandle(s) for this node
+
+additionalProperties: true
+
+examples:
+  - |
+    qca_pwrseq: qca-pwrseq {
+      #pwrseq-cells = <1>;
+    };
+
+    bluetooth {
+      bt-pwrseq = <&qca_pwrseq 1>;
+    };
+...
-- 
2.33.0


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Re: [PATCH v1 01/15] dt-bindings: add pwrseq device tree bindings

[Rob Herring]

On Wed, Oct 06, 2021 at 06:53:53AM +0300, Dmitry Baryshkov wrote:
> Add device tree bindings for the new power sequencer subsystem.
> Consumers would reference pwrseq nodes using "foo-pwrseq" properties.
> Providers would use '#pwrseq-cells' property to declare the amount of
> cells in the pwrseq specifier.

Please use get_maintainers.pl.

This is not a pattern I want to encourage, so NAK on a common binding.

> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> ---
>  .../bindings/power/pwrseq/pwrseq.yaml         | 32 +++++++++++++++++++
>  1 file changed, 32 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/power/pwrseq/pwrseq.yaml
> 
> diff --git a/Documentation/devicetree/bindings/power/pwrseq/pwrseq.yaml b/Documentation/devicetree/bindings/power/pwrseq/pwrseq.yaml
> new file mode 100644
> index 000000000000..4a8f6c0218bf
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/power/pwrseq/pwrseq.yaml
> @@ -0,0 +1,32 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/power/pwrseq/pwrseq.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Power Sequencer devices
> +
> +maintainers:
> +  - Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> +
> +properties:
> +  "#powerseq-cells":
> +    description:
> +      Number of cells in a pwrseq specifier.
> +
> +patternProperties:
> +  ".*-pwrseq$":
> +    description: Power sequencer supply phandle(s) for this node
> +
> +additionalProperties: true
> +
> +examples:
> +  - |
> +    qca_pwrseq: qca-pwrseq {
> +      #pwrseq-cells = <1>;
> +    };
> +
> +    bluetooth {
> +      bt-pwrseq = <&qca_pwrseq 1>;
> +    };
> +...
> -- 
> 2.33.0
> 
> 

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Re: [PATCH v1 01/15] dt-bindings: add pwrseq device tree bindings

[Dmitry Baryshkov]

On 26/10/2021 15:53, Rob Herring wrote:
> On Wed, Oct 06, 2021 at 06:53:53AM +0300, Dmitry Baryshkov wrote:
>> Add device tree bindings for the new power sequencer subsystem.
>> Consumers would reference pwrseq nodes using "foo-pwrseq" properties.
>> Providers would use '#pwrseq-cells' property to declare the amount of
>> cells in the pwrseq specifier.
> 
> Please use get_maintainers.pl.
> 
> This is not a pattern I want to encourage, so NAK on a common binding.


Could you please spend a few more words, describing what is not 
encouraged? The whole foo-subsys/#subsys-cells structure?

Or just specifying the common binding?

> 
>>
>> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
>> ---
>>   .../bindings/power/pwrseq/pwrseq.yaml         | 32 +++++++++++++++++++
>>   1 file changed, 32 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/power/pwrseq/pwrseq.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/power/pwrseq/pwrseq.yaml b/Documentation/devicetree/bindings/power/pwrseq/pwrseq.yaml
>> new file mode 100644
>> index 000000000000..4a8f6c0218bf
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/power/pwrseq/pwrseq.yaml
>> @@ -0,0 +1,32 @@
>> +# SPDX-License-Identifier: GPL-2.0
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/power/pwrseq/pwrseq.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Power Sequencer devices
>> +
>> +maintainers:
>> +  - Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
>> +
>> +properties:
>> +  "#powerseq-cells":
>> +    description:
>> +      Number of cells in a pwrseq specifier.
>> +
>> +patternProperties:
>> +  ".*-pwrseq$":
>> +    description: Power sequencer supply phandle(s) for this node
>> +
>> +additionalProperties: true
>> +
>> +examples:
>> +  - |
>> +    qca_pwrseq: qca-pwrseq {
>> +      #pwrseq-cells = <1>;
>> +    };
>> +
>> +    bluetooth {
>> +      bt-pwrseq = <&qca_pwrseq 1>;
>> +    };
>> +...
>> -- 
>> 2.33.0
>>
>>


-- 
With best wishes
Dmitry

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Re: [PATCH v1 01/15] dt-bindings: add pwrseq device tree bindings

[Rob Herring]

On Tue, Oct 26, 2021 at 9:42 AM Dmitry Baryshkov
<dmitry.baryshkov@linaro.org> wrote:
>
> On 26/10/2021 15:53, Rob Herring wrote:
> > On Wed, Oct 06, 2021 at 06:53:53AM +0300, Dmitry Baryshkov wrote:
> >> Add device tree bindings for the new power sequencer subsystem.
> >> Consumers would reference pwrseq nodes using "foo-pwrseq" properties.
> >> Providers would use '#pwrseq-cells' property to declare the amount of
> >> cells in the pwrseq specifier.
> >
> > Please use get_maintainers.pl.
> >
> > This is not a pattern I want to encourage, so NAK on a common binding.
>
>
> Could you please spend a few more words, describing what is not
> encouraged? The whole foo-subsys/#subsys-cells structure?

No, that's generally how common provider/consumer style bindings work.

> Or just specifying the common binding?

If we could do it again, I would not have mmc pwrseq binding. The
properties belong in the device's node. So don't generalize the mmc
pwrseq binding.

It's a kernel problem if the firmware says there's a device on a
'discoverable' bus and the kernel can't discover it. I know you have
the added complication of a device with 2 interfaces, but please,
let's solve one problem at a time.

Rob

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Re: [PATCH v1 01/15] dt-bindings: add pwrseq device tree bindings

[Dmitry Baryshkov]

On 28/10/2021 00:53, Rob Herring wrote:
> On Tue, Oct 26, 2021 at 9:42 AM Dmitry Baryshkov
> <dmitry.baryshkov@linaro.org> wrote:
>>
>> On 26/10/2021 15:53, Rob Herring wrote:
>>> On Wed, Oct 06, 2021 at 06:53:53AM +0300, Dmitry Baryshkov wrote:
>>>> Add device tree bindings for the new power sequencer subsystem.
>>>> Consumers would reference pwrseq nodes using "foo-pwrseq" properties.
>>>> Providers would use '#pwrseq-cells' property to declare the amount of
>>>> cells in the pwrseq specifier.
>>>
>>> Please use get_maintainers.pl.
>>>
>>> This is not a pattern I want to encourage, so NAK on a common binding.
>>
>>
>> Could you please spend a few more words, describing what is not
>> encouraged? The whole foo-subsys/#subsys-cells structure?
> 
> No, that's generally how common provider/consumer style bindings work.
> 
>> Or just specifying the common binding?
> 
> If we could do it again, I would not have mmc pwrseq binding. The
> properties belong in the device's node. So don't generalize the mmc
> pwrseq binding.
> 
> It's a kernel problem if the firmware says there's a device on a
> 'discoverable' bus and the kernel can't discover it. I know you have
> the added complication of a device with 2 interfaces, but please,
> let's solve one problem at a time.

The PCI bus handling is a separate topic for now (as you have seen from 
the clearly WIP patches targeting just testing of qca6390's wifi part).

For me there are three parts of the device:
- power regulator / device embedded power domain.
- WiFi
- Bluetooth

With the power regulator being a complex and a bit nasty beast. It has 
several regulators beneath, which have to be powered up in a proper way.
Next platforms might bring additional requirements common to both WiFi 
and BT parts (like having additional clocks, etc). It is externally 
controlled (after providing power to it you have to tell, which part of 
the chip is required by pulling up the WiFi and/or BT enable GPIOs.

Having to duplicate this information in BT and WiFi cases results in 
non-aligned bindings (with WiFi and BT parts using different set of 
properties and different property names) and non-algined drivers (so the 
result of the powerup would depend on the order of drivers probing).

So far I still suppose that having a single separate entity controlling 
the powerup of such chips is the right thing to do.

I'd prefer to use the power-domain bindings (as the idea seems to be 
aligned here), but as the power-domain is used for the in-chip power 
domains, we had to invent the pwrseq name.

-- 
With best wishes
Dmitry

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Re: [PATCH v1 01/15] dt-bindings: add pwrseq device tree bindings

[Srinivas Kandagatla]

On 02/11/2021 15:26, Dmitry Baryshkov wrote:
> On 28/10/2021 00:53, Rob Herring wrote:
>> On Tue, Oct 26, 2021 at 9:42 AM Dmitry Baryshkov
>> <dmitry.baryshkov@linaro.org> wrote:
>>>
>>> On 26/10/2021 15:53, Rob Herring wrote:
>>>> On Wed, Oct 06, 2021 at 06:53:53AM +0300, Dmitry Baryshkov wrote:
>>>>> Add device tree bindings for the new power sequencer subsystem.
>>>>> Consumers would reference pwrseq nodes using "foo-pwrseq" properties.
>>>>> Providers would use '#pwrseq-cells' property to declare the amount of
>>>>> cells in the pwrseq specifier.
>>>>
>>>> Please use get_maintainers.pl.
>>>>
>>>> This is not a pattern I want to encourage, so NAK on a common binding.
>>>
>>>
>>> Could you please spend a few more words, describing what is not
>>> encouraged? The whole foo-subsys/#subsys-cells structure?
>>
>> No, that's generally how common provider/consumer style bindings work.
>>
>>> Or just specifying the common binding?
>>
>> If we could do it again, I would not have mmc pwrseq binding. The
>> properties belong in the device's node. So don't generalize the mmc
>> pwrseq binding.
>>
>> It's a kernel problem if the firmware says there's a device on a
>> 'discoverable' bus and the kernel can't discover it. I know you have
>> the added complication of a device with 2 interfaces, but please,
>> let's solve one problem at a time.

Just to keep this topic updated with some pointers [1] to changes done 
to solve same problem in USB Hub. These patches 
(drivers/usb/misc/onboard_usb_hub*) have been merged since last year July.

It looks like we can take some inspiration from this to address PCIE Bus 
issue aswell.

Thanks to Neil to point this.

[1] 
https://lore.kernel.org/lkml/20220630193530.2608178-1-mka@chromium.org/T/


--srini
> 
> The PCI bus handling is a separate topic for now (as you have seen from 
> the clearly WIP patches targeting just testing of qca6390's wifi part).
> 
> For me there are three parts of the device:
> - power regulator / device embedded power domain.
> - WiFi
> - Bluetooth
> 
> With the power regulator being a complex and a bit nasty beast. It has 
> several regulators beneath, which have to be powered up in a proper way.
> Next platforms might bring additional requirements common to both WiFi 
> and BT parts (like having additional clocks, etc). It is externally 
> controlled (after providing power to it you have to tell, which part of 
> the chip is required by pulling up the WiFi and/or BT enable GPIOs.
> 
> Having to duplicate this information in BT and WiFi cases results in 
> non-aligned bindings (with WiFi and BT parts using different set of 
> properties and different property names) and non-algined drivers (so the 
> result of the powerup would depend on the order of drivers probing).
> 
> So far I still suppose that having a single separate entity controlling 
> the powerup of such chips is the right thing to do.
> 
> I'd prefer to use the power-domain bindings (as the idea seems to be 
> aligned here), but as the power-domain is used for the in-chip power 
> domains, we had to invent the pwrseq name.
> 

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[PATCH v1 02/15] power: add power sequencer subsystem

[Dmitry Baryshkov]

Basing on MMC's pwrseq support code, add separate power sequencer
subsystem. It will be used by other drivers to handle device power up
requirements.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 Documentation/driver-api/index.rst  |   1 +
 Documentation/driver-api/pwrseq.rst |  77 +++++
 drivers/power/Kconfig               |   1 +
 drivers/power/Makefile              |   1 +
 drivers/power/pwrseq/Kconfig        |  14 +
 drivers/power/pwrseq/Makefile       |   6 +
 drivers/power/pwrseq/core.c         | 448 ++++++++++++++++++++++++++++
 include/linux/pwrseq/consumer.h     |  82 +++++
 include/linux/pwrseq/driver.h       | 160 ++++++++++
 9 files changed, 790 insertions(+)
 create mode 100644 Documentation/driver-api/pwrseq.rst
 create mode 100644 drivers/power/pwrseq/Kconfig
 create mode 100644 drivers/power/pwrseq/Makefile
 create mode 100644 drivers/power/pwrseq/core.c
 create mode 100644 include/linux/pwrseq/consumer.h
 create mode 100644 include/linux/pwrseq/driver.h

diff --git a/Documentation/driver-api/index.rst b/Documentation/driver-api/index.rst
index c57c609ad2eb..15f51c08db1f 100644
--- a/Documentation/driver-api/index.rst
+++ b/Documentation/driver-api/index.rst
@@ -94,6 +94,7 @@ available subsections can be seen below.
    ptp
    phy/index
    pwm
+   pwrseq
    pldmfw/index
    rfkill
    serial/index
diff --git a/Documentation/driver-api/pwrseq.rst b/Documentation/driver-api/pwrseq.rst
new file mode 100644
index 000000000000..df7cfce0f792
--- /dev/null
+++ b/Documentation/driver-api/pwrseq.rst
@@ -0,0 +1,77 @@
+.. Copyright 2021 Linaro Ltd.
+
+..   This documentation is free software; you can redistribute
+..   it and/or modify it under the terms of the GNU General Public
+..   License version 2 as published by the Free Software Foundation.
+
+====================
+Power Sequencing API
+====================
+
+:Author: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
+:Author: Ulf Hansson <ulf.hansson@linaro.org> (original MMC pwrseq)
+
+Introduction
+============
+
+This framework is designed to provide a standard kernel interface to
+handle power sequencing requirements for different devices.
+
+The intention is to provide a generic way to handle power sequencing of complex
+devices sitting on a variety of busses. First implementation comes from MMC
+SDIO/eMMC code, not generified to support other kinds of devices.
+
+Glossary
+--------
+
+The pwrseq API uses a number of terms which may not be familiar:
+
+Power sequencer
+
+    Electronic device (or part of it) that supplies power to other devices.
+    Unlike regulators (which typically handle single voltage), power sequencer
+    handles several voltage inputs. Also it does not provide an exact voltage
+    output. Instead it makes sure that the consumers (see below) are powered on
+    when required.
+
+Consumer
+
+    Electronic device which consumes power provided by a power sequencer.
+
+Consumer driver interface
+=========================
+
+This offers a similar API to the kernel clock or regulator framework. Consumer
+drivers use `get <#API-pwrseq-get>`__ and
+`put <#API-pwrseq-put>`__ operations to acquire and release
+power sequencers. Functions are provided to `power on
+<#API-pwrseq-full-power-on>`__ and `power off <#API-pwrseq-power-off>`__ the
+power sequencer.
+
+A stub version of this API is provided when the power sequencer framework is
+not in use in order to minimise the need to use ifdefs.
+
+Power sequencer driver interface
+================================
+
+Drivers for power sequencers register the sequencer within the pwrseq
+core, providing operations structures to the core.
+
+API reference
+=============
+
+Due to limitations of the kernel documentation framework and the
+existing layout of the source code the entire regulator API is
+documented here.
+
+.. kernel-doc:: include/linux/pwrseq/consumer.h
+   :internal:
+
+.. kernel-doc:: include/linux/pwrseq/driver.h
+   :internal:
+
+.. kernel-doc:: include/linux/pwrseq/fallback.h
+   :internal:
+
+.. kernel-doc:: drivers/power/pwrseq/core.c
+   :export:
diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index 696bf77a7042..c87cd2240a74 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -1,3 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0-only
+source "drivers/power/pwrseq/Kconfig"
 source "drivers/power/reset/Kconfig"
 source "drivers/power/supply/Kconfig"
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index effbf0377f32..1dbce454a8c4 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -1,3 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0-only
 obj-$(CONFIG_POWER_RESET)	+= reset/
 obj-$(CONFIG_POWER_SUPPLY)	+= supply/
+obj-$(CONFIG_PWRSEQ)		+= pwrseq/
diff --git a/drivers/power/pwrseq/Kconfig b/drivers/power/pwrseq/Kconfig
new file mode 100644
index 000000000000..dab8f4d860fe
--- /dev/null
+++ b/drivers/power/pwrseq/Kconfig
@@ -0,0 +1,14 @@
+# SPDX-License-Identifier: GPL-2.0-only
+menuconfig PWRSEQ
+	bool "Power Sequencer drivers"
+	help
+	  Provides support for special power sequencing drivers. Power
+	  sequencer is an entity providing abstraced power on/power off/reset
+	  operations for the connected devices. Possible usages include MMC
+	  SDIO devices, some complex WiFi/BT chips, controlled USB hubs, etc.
+
+	  Say Y here to enable support for such devices.
+
+if PWRSEQ
+
+endif
diff --git a/drivers/power/pwrseq/Makefile b/drivers/power/pwrseq/Makefile
new file mode 100644
index 000000000000..108429ff6445
--- /dev/null
+++ b/drivers/power/pwrseq/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for power sequencer drivers.
+#
+
+obj-$(CONFIG_PWRSEQ) += core.o
diff --git a/drivers/power/pwrseq/core.c b/drivers/power/pwrseq/core.c
new file mode 100644
index 000000000000..d29b4b97b95c
--- /dev/null
+++ b/drivers/power/pwrseq/core.c
@@ -0,0 +1,448 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2021 (c) Linaro Ltd.
+ * Author: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
+ *
+ * Based on phy-core.c:
+ * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
+ */
+
+#include <linux/device.h>
+#include <linux/idr.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/pwrseq/consumer.h>
+#include <linux/pwrseq/driver.h>
+#include <linux/slab.h>
+
+#define	to_pwrseq(a)	(container_of((a), struct pwrseq, dev))
+
+static DEFINE_IDA(pwrseq_ida);
+static DEFINE_MUTEX(pwrseq_provider_mutex);
+static LIST_HEAD(pwrseq_provider_list);
+
+/**
+ * struct pwrseq_provider - a 
+ */
+struct pwrseq_provider {
+	struct device		*dev;
+	struct module		*owner;
+	struct list_head	list;
+	void			*data;
+	struct pwrseq * (*of_xlate)(void *data, struct of_phandle_args *args);
+};
+
+/**
+ * pwrseq_put() - release the pwrseq
+ * @pwrseq: the pwrseq returned by pwrseq_get()
+ *
+ * Releases a refcount on the pwrseq instance received from pwrseq_get().
+ */
+void pwrseq_put(struct pwrseq *pwrseq)
+{
+	module_put(pwrseq->owner);
+	put_device(&pwrseq->dev);
+}
+EXPORT_SYMBOL_GPL(pwrseq_put);
+
+static struct pwrseq_provider *of_pwrseq_provider_lookup(struct device_node *node)
+{
+	struct pwrseq_provider *pwrseq_provider;
+
+	list_for_each_entry(pwrseq_provider, &pwrseq_provider_list, list) {
+		if (pwrseq_provider->dev->of_node == node)
+			return pwrseq_provider;
+	}
+
+	return ERR_PTR(-EPROBE_DEFER);
+}
+
+static struct pwrseq *_of_pwrseq_get(struct device *dev, const char *id)
+{
+	struct pwrseq_provider *pwrseq_provider;
+	struct pwrseq *pwrseq;
+	struct of_phandle_args args;
+	char prop_name[64]; /* 64 is max size of property name */
+	int ret;
+
+	snprintf(prop_name, sizeof(prop_name), "%s-pwrseq", id);
+	ret = of_parse_phandle_with_args(dev->of_node, prop_name, "#pwrseq-cells", 0, &args);
+	if (ret == -ENOENT)
+		return NULL;
+	else if (ret < 0)
+		return ERR_PTR(ret);
+
+	mutex_lock(&pwrseq_provider_mutex);
+	pwrseq_provider = of_pwrseq_provider_lookup(args.np);
+	if (IS_ERR(pwrseq_provider) || !try_module_get(pwrseq_provider->owner)) {
+		pwrseq = ERR_PTR(-EPROBE_DEFER);
+		goto out_unlock;
+	}
+
+	if (!of_device_is_available(args.np)) {
+		dev_warn(pwrseq_provider->dev, "Requested pwrseq is disabled\n");
+		pwrseq = ERR_PTR(-ENODEV);
+		goto out_put_module;
+	}
+
+	pwrseq = pwrseq_provider->of_xlate(pwrseq_provider->data, &args);
+
+out_put_module:
+	module_put(pwrseq_provider->owner);
+
+out_unlock:
+	mutex_unlock(&pwrseq_provider_mutex);
+	of_node_put(args.np);
+
+	return pwrseq;
+}
+
+/**
+ * pwrseq_get() - lookup and obtain a reference to a pwrseq
+ * @dev: device for which to get the pwrseq
+ * @id: name of the pwrseq from device's point of view
+ *
+ * Returns the pwrseq instance, after getting a refcount to it; or
+ * NULL if there is no such pwrseq. The caller is responsible for
+ * calling pwrseq_put() to release that count.
+ */
+struct pwrseq * pwrseq_get(struct device *dev, const char *id)
+{
+	struct pwrseq *pwrseq;
+
+	pwrseq = _of_pwrseq_get(dev, id);
+	if (IS_ERR_OR_NULL(pwrseq))
+		return pwrseq;
+
+	if (!try_module_get(pwrseq->owner))
+		return ERR_PTR(-EPROBE_DEFER);
+
+	get_device(&pwrseq->dev);
+
+	return pwrseq;
+}
+EXPORT_SYMBOL_GPL(pwrseq_get);
+
+static void devm_pwrseq_release(struct device *dev, void *res)
+{
+	struct pwrseq *pwrseq = *(struct pwrseq **)res;
+
+	pwrseq_put(pwrseq);
+}
+
+/**
+ * devm_pwrseq_get() - lookup and obtain a reference to a pwrseq
+ * @dev: device for which to get the pwrseq
+ * @id: name of the pwrseq from device's point of view
+ *
+ * Devres-managed variant of pwrseq_get().
+ * Returns the pwrseq instance, after getting a refcount to it; or
+ * NULL if there is no such pwrseq. Gets the pwrseq using pwrseq_get(), and
+ * associates it with the a device using devres. On driver detach, returned
+ * pwrseq is automatically put using pwrseq_put(), removing the need to call it
+ * manually.
+ */
+struct pwrseq * devm_pwrseq_get(struct device *dev, const char *id)
+{
+	struct pwrseq **ptr, *pwrseq;
+
+	ptr = devres_alloc(devm_pwrseq_release, sizeof(*ptr), GFP_KERNEL);
+	if (!ptr)
+		return ERR_PTR(-ENOMEM);
+
+	pwrseq = pwrseq_get(dev, id);
+	if (!IS_ERR_OR_NULL(pwrseq)) {
+		*ptr = pwrseq;
+		devres_add(dev, ptr);
+	} else {
+		devres_free(ptr);
+	}
+
+	return pwrseq;
+}
+EXPORT_SYMBOL_GPL(devm_pwrseq_get);
+
+/**
+ * pwrseq_pre_power_on() - perform pre-power on actions
+ * @pwrseq: pwrseq instance
+ *
+ * Perform pre-powering on actions, like pulling reset pin.  This function
+ * should be called before device is being powered on. Typical usage would
+ * include MMC cards, where pwrseq subsystem is combined with the MMC power
+ * controls.
+ * In most cases there is no need to call it directly, use
+ * @pwrseq_full_power_on() instead.
+ */
+int pwrseq_pre_power_on(struct pwrseq *pwrseq)
+{
+	if (pwrseq && pwrseq->ops->pre_power_on)
+		return pwrseq->ops->pre_power_on(pwrseq);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(pwrseq_pre_power_on);
+
+/**
+ * pwrseq_power_on() - power on the device
+ * @pwrseq: pwrseq instance
+ *
+ * Power on the device and perform post-power on actions, like pulling reset
+ * or enable pin. In most cases there is no need to call it directly, use
+ * @pwrseq_full_power_on() instead.
+ */
+int pwrseq_power_on(struct pwrseq *pwrseq)
+{
+	if (pwrseq && pwrseq->ops->power_on)
+		return pwrseq->ops->power_on(pwrseq);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(pwrseq_power_on);
+
+/**
+ * pwrseq_power_off() - power off the device
+ * @pwrseq: pwrseq instance
+ *
+ * Power off the device clearly.
+ */
+void pwrseq_power_off(struct pwrseq *pwrseq)
+{
+	if (pwrseq && pwrseq->ops->power_off)
+		pwrseq->ops->power_off(pwrseq);
+}
+EXPORT_SYMBOL_GPL(pwrseq_power_off);
+
+/**
+ * pwrseq_reset() - reset powered device
+ * @pwrseq: pwrseq instance
+ *
+ * Reset the device controlled by the power sequencer.
+ */
+void pwrseq_reset(struct pwrseq *pwrseq)
+{
+	if (pwrseq && pwrseq->ops->reset)
+		pwrseq->ops->reset(pwrseq);
+}
+EXPORT_SYMBOL_GPL(pwrseq_reset);
+
+static void pwrseq_dev_release(struct device *dev)
+{
+	struct pwrseq *pwrseq = to_pwrseq(dev);
+
+	ida_free(&pwrseq_ida, pwrseq->id);
+	of_node_put(dev->of_node);
+	kfree(pwrseq);
+}
+
+static struct class pwrseq_class = {
+	.name = "pwrseq",
+	.dev_release = pwrseq_dev_release,
+};
+
+/**
+ * __pwrseq_create() - internal helper for pwrseq_create
+ * @dev: parent device
+ * @owner: the module providing callbacks.
+ * @ops: pwrseq device callbacks
+ *
+ * This is an internal helper for pwrseq_create which should not be called
+ * directly.
+ *
+ * Return: created instance or the wrapped error code.
+ */
+struct pwrseq *__pwrseq_create(struct device *dev, struct module *owner, const struct pwrseq_ops *ops)
+{
+	struct pwrseq *pwrseq;
+	int ret;
+
+	if (WARN_ON(!dev))
+		return ERR_PTR(-EINVAL);
+
+	pwrseq = kzalloc(sizeof(*pwrseq), GFP_KERNEL);
+	if (!pwrseq)
+		return ERR_PTR(-ENOMEM);
+
+	ret = ida_alloc(&pwrseq_ida, GFP_KERNEL);
+	if (ret < 0)
+		goto free_pwrseq;
+
+	pwrseq->id = ret;
+
+	device_initialize(&pwrseq->dev);
+
+	pwrseq->dev.class = &pwrseq_class;
+	pwrseq->dev.parent = dev;
+	pwrseq->dev.of_node = of_node_get(dev->of_node);
+	pwrseq->ops = ops;
+	pwrseq->owner = owner;
+
+	ret = dev_set_name(&pwrseq->dev, "pwrseq-%s.%u", dev_name(dev), pwrseq->id);
+	if (ret)
+		goto put_dev;
+
+	ret = device_add(&pwrseq->dev);
+	if (ret)
+		goto put_dev;
+
+	return pwrseq;
+
+put_dev:
+	/* will call pwrseq_dev_release() to free resources */
+	put_device(&pwrseq->dev);
+
+	return ERR_PTR(ret);
+
+free_pwrseq:
+	kfree(pwrseq);
+
+	return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_GPL(__pwrseq_create);
+
+void pwrseq_destroy(struct pwrseq *pwrseq)
+{
+	device_unregister(&pwrseq->dev);
+}
+EXPORT_SYMBOL_GPL(pwrseq_destroy);
+
+static void devm_pwrseq_destroy(struct device *dev, void *res)
+{
+	struct pwrseq *pwrseq = *(struct pwrseq **)res;
+
+	pwrseq_destroy(pwrseq);
+}
+
+/**
+ * __devm_pwrseq_create() - devres-managed version of __pwrseq_create
+ * @dev: parent device
+ * @owner: the module providing callbacks.
+ * @ops: pwrseq device callbacks
+ *
+ * This is the devres-managed version of __pwrseq_create(). It is an internal
+ * helper which should not be called directly.
+ *
+ * Return: created instance or the wrapped error code.
+ */
+struct pwrseq *__devm_pwrseq_create(struct device *dev, struct module *owner, const struct pwrseq_ops *ops)
+{
+	struct pwrseq **ptr, *pwrseq;
+
+	ptr = devres_alloc(devm_pwrseq_destroy, sizeof(*ptr), GFP_KERNEL);
+	if (!ptr)
+		return ERR_PTR(-ENOMEM);
+
+	pwrseq = __pwrseq_create(dev, owner, ops);
+	if (!IS_ERR(pwrseq)) {
+		*ptr = pwrseq;
+		devres_add(dev, ptr);
+	} else {
+		devres_free(ptr);
+	}
+
+	return pwrseq;
+}
+EXPORT_SYMBOL_GPL(__devm_pwrseq_create);
+
+/**
+ * __of_pwrseq_provider_register - internal version of of_pwrseq_provider_register
+ * @dev: handling device
+ * @owner: the module providing callbacks.
+ * @xlate: xlate function returning pwrseq instance corresponding to OF args
+ * @data: provider-specific data to be passed to xlate function
+ *
+ * This is an internal helper of of_pwrseq_provider_register, it should not be
+ * called directly.
+ */
+struct pwrseq_provider *__of_pwrseq_provider_register(struct device *dev,
+	struct module *owner,
+	struct pwrseq * (*of_xlate)(void *data,
+				    struct of_phandle_args *args),
+	void *data)
+{
+	struct pwrseq_provider *pwrseq_provider;
+
+	pwrseq_provider = kzalloc(sizeof(*pwrseq_provider), GFP_KERNEL);
+	if (!pwrseq_provider)
+		return ERR_PTR(-ENOMEM);
+
+	if (!fwnode_property_present(dev->fwnode, "#pwrseq-cells"))
+		dev_warn(dev, "no #pwrseq-cells property found, please add the property to the provider\n");
+
+	pwrseq_provider->dev = dev;
+	pwrseq_provider->owner = owner;
+	pwrseq_provider->of_xlate = of_xlate;
+	pwrseq_provider->data = data;
+
+	mutex_lock(&pwrseq_provider_mutex);
+	list_add_tail(&pwrseq_provider->list, &pwrseq_provider_list);
+	mutex_unlock(&pwrseq_provider_mutex);
+
+	return pwrseq_provider;
+}
+EXPORT_SYMBOL_GPL(__of_pwrseq_provider_register);
+
+/**
+ * of_pwrseq_provider_unregister() - unregister pwrseq provider
+ * @pwrseq_provider: pwrseq provider to unregister
+ *
+ * Unregister pwrseq provider previously registered by of_pwrseq_provider_register().
+ */
+void of_pwrseq_provider_unregister(struct pwrseq_provider *pwrseq_provider)
+{
+	if (IS_ERR(pwrseq_provider))
+		return;
+
+	mutex_lock(&pwrseq_provider_mutex);
+	list_del(&pwrseq_provider->list);
+	kfree(pwrseq_provider);
+	mutex_unlock(&pwrseq_provider_mutex);
+}
+EXPORT_SYMBOL_GPL(of_pwrseq_provider_unregister);
+
+static void devm_pwrseq_provider_unregister(struct device *dev, void *res)
+{
+	struct pwrseq_provider *pwrseq_provider = *(struct pwrseq_provider **)res;
+
+	of_pwrseq_provider_unregister(pwrseq_provider);
+}
+
+/**
+ * __devm_of_pwrseq_provider_register - internal version of devm_of_pwrseq_provider_register
+ * @dev: handling device
+ * @owner: the module providing callbacks.
+ * @xlate: xlate function returning pwrseq instance corresponding to OF args
+ * @data: provider-specific data to be passed to xlate function
+ *
+ * This is an internal helper of devm_of_pwrseq_provider_register, it should
+ * not be called directly.
+ */
+struct pwrseq_provider *__devm_of_pwrseq_provider_register(struct device *dev,
+	struct module *owner,
+	struct pwrseq * (*of_xlate)(void *data,
+				    struct of_phandle_args *args),
+	void *data)
+{
+	struct pwrseq_provider **ptr, *pwrseq_provider;
+
+	ptr = devres_alloc(devm_pwrseq_provider_unregister, sizeof(*ptr), GFP_KERNEL);
+	if (!ptr)
+		return ERR_PTR(-ENOMEM);
+
+	pwrseq_provider = __of_pwrseq_provider_register(dev, owner, of_xlate, data);
+	if (!IS_ERR(pwrseq_provider)) {
+		*ptr = pwrseq_provider;
+		devres_add(dev, ptr);
+	} else {
+		devres_free(ptr);
+	}
+
+	return pwrseq_provider;
+}
+EXPORT_SYMBOL_GPL(__devm_of_pwrseq_provider_register);
+
+static int __init pwrseq_core_init(void)
+{
+	return class_register(&pwrseq_class);
+}
+device_initcall(pwrseq_core_init);
diff --git a/include/linux/pwrseq/consumer.h b/include/linux/pwrseq/consumer.h
new file mode 100644
index 000000000000..7c8efefd3184
--- /dev/null
+++ b/include/linux/pwrseq/consumer.h
@@ -0,0 +1,82 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (c) 2021 Linaro Ltd.
+ */
+
+#ifndef __LINUX_PWRSEQ_CONSUMER_H__
+#define __LINUX_PWRSEQ_CONSUMER_H__
+
+struct pwrseq;
+struct device;
+
+#if defined(CONFIG_PWRSEQ)
+
+struct pwrseq *__must_check pwrseq_get(struct device *dev, const char *id);
+struct pwrseq *__must_check devm_pwrseq_get(struct device *dev, const char *id);
+
+void pwrseq_put(struct pwrseq *pwrseq);
+
+int pwrseq_pre_power_on(struct pwrseq *pwrseq);
+int pwrseq_power_on(struct pwrseq *pwrseq);
+void pwrseq_power_off(struct pwrseq *pwrseq);
+void pwrseq_reset(struct pwrseq *pwrseq);
+
+#else
+
+static inline struct pwrseq *__must_check
+pwrseq_get(struct device *dev, const char *id)
+{
+	return NULL;
+}
+
+static inline struct pwrseq *__must_check
+devm_pwrseq_get(struct device *dev, const char *id)
+{
+	return NULL;
+}
+
+static inline void pwrseq_put(struct pwrseq *pwrseq)
+{
+}
+
+static inline int pwrseq_pre_power_on(struct pwrseq *pwrseq)
+{
+	return -ENOSYS;
+}
+
+static inline int pwrseq_power_on(struct pwrseq *pwrseq)
+{
+	return -ENOSYS;
+}
+
+static inline void pwrseq_power_off(struct pwrseq *pwrseq)
+{
+}
+
+static inline void pwrseq_reset(struct pwrseq *pwrseq)
+{
+}
+
+#endif
+
+/**
+ * pwrseq_full_power_on() - Perform full power on of the sequencer
+ * @pwrseq: the power sequencer to power on
+ *
+ * Perform full power on of the sequencer, including pre power on and
+ * power on steps.
+ *
+ * Return: 0 upon no error; -error upon error.
+ */
+static inline int pwrseq_full_power_on(struct pwrseq *pwrseq)
+{
+	int ret;
+
+	ret = pwrseq_pre_power_on(pwrseq);
+	if (ret)
+		return ret;
+
+	return pwrseq_power_on(pwrseq);
+}
+
+#endif /* __LINUX_PWRSEQ_CONSUMER_H__ */
diff --git a/include/linux/pwrseq/driver.h b/include/linux/pwrseq/driver.h
new file mode 100644
index 000000000000..bdb8a25a8504
--- /dev/null
+++ b/include/linux/pwrseq/driver.h
@@ -0,0 +1,160 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (c) 2021 Linaro Ltd.
+ */
+
+#ifndef __LINUX_PWRSEQ_DRIVER_H__
+#define __LINUX_PWRSEQ_DRIVER_H__
+
+#include <linux/device.h>
+
+struct pwrseq;
+
+/**
+ * struct pwrseq_ops - power sequencer operations.
+ *
+ * @pre_power_on: Perform pre powering operations (like ensuring that the
+ *                device will be held in the reset)
+ * @power_on: Power on the sequencer, making sure that the consumer
+ *            devices can be operated
+ * @power_off: Power off the sequencer, removing power from the comsumer
+ *             device (if possible)
+ * @reset: Reset the consumer device
+ */
+struct pwrseq_ops {
+	int (*pre_power_on)(struct pwrseq *pwrseq);
+	int (*power_on)(struct pwrseq *pwrseq);
+	void (*power_off)(struct pwrseq *pwrseq);
+	void (*reset)(struct pwrseq *pwrseq);
+};
+
+struct module;
+
+/**
+ * struct pwrseq - private pwrseq data
+ *
+ * Power sequencer device, one for each power sequencer.
+ *
+ * This should *not* be used directly by anything except the pwrseq core.
+ */
+struct pwrseq {
+	struct device dev;
+	const struct pwrseq_ops *ops;
+	unsigned int id;
+	struct module *owner;
+};
+
+struct pwrseq *__pwrseq_create(struct device *dev, struct module *owner, const struct pwrseq_ops *ops);
+struct pwrseq *__devm_pwrseq_create(struct device *dev, struct module *owner, const struct pwrseq_ops *ops);
+
+/**
+ * pwrseq_create() - create pwrseq instance
+ * @dev: parent device
+ * @ops: pwrseq device callbacks
+ *
+ * Create new pwrseq instance parenting with @dev using provided @ops set of
+ * callbacks. Create instance should be destroyed using @pwrseq_destroy().
+ *
+ * Return: created instance or the wrapped error code.
+ */
+#define pwrseq_create(dev, ops, data) __pwrseq_create((dev), THIS_MODULE, (ops))
+
+/**
+ * devm_pwrseq_create() - devres-managed version of pwrseq_create
+ * @dev: parent device
+ * @ops: pwrseq device callbacks
+ *
+ * This is the devres-managed version of pwrseq_create(). It creates new
+ * pwrseq instance parenting with @dev using provided @ops set of
+ * callbacks. Returned object is destroyed automatically, one must not call
+ * pwrseq_destroy().
+ *
+ * Return: created instance or the wrapped error code.
+ */
+#define devm_pwrseq_create(dev, ops, data) __devm_pwrseq_create((dev), THIS_MODULE, (ops))
+
+void pwrseq_destroy(struct pwrseq *pwrseq);
+
+/**
+ * pwrseq_set_data() - get drv-specific data for the pwrseq
+ * @pwrseq: the pwrseq to get driver data for
+ * @data: the data to set
+ *
+ * Sets the driver-specific data for the provided powrseq instance.
+ */
+static inline void pwrseq_set_drvdata(struct pwrseq *pwrseq, void *data)
+{
+	dev_set_drvdata(&pwrseq->dev, data);
+}
+
+/**
+ * pwrseq_get_data() - get drv-specific data for the pwrseq
+ * @pwrseq: the pwrseq to get driver data for
+ *
+ * Returns driver-specific data for the provided powrseq instance.
+ */
+static inline void *pwrseq_get_drvdata(struct pwrseq *pwrseq)
+{
+	return dev_get_drvdata(&pwrseq->dev);
+}
+
+/**
+ * of_pwrseq_provider_register() - register OF pwrseq provider
+ * @dev: handling device
+ * @xlate: xlate function returning pwrseq instance corresponding to OF args
+ * @data: provider-specific data to be passed to xlate function
+ *
+ * This macros registers OF-specific pwrseq provider. Pwrseq core will call
+ * specified @xlate function to retrieve pwrseq instance corresponding to
+ * device tree arguments. Returned pwrseq provider should be unregistered using
+ * of_pwrseq_provider_unregister().
+ */
+#define of_pwrseq_provider_register(dev, xlate, data)	\
+	__of_pwrseq_provider_register((dev), THIS_MODULE, (xlate), (data))
+
+/**
+ * devm_of_pwrseq_provider_register() - devres-managed version of of_pwrseq_provider_register
+ * @dev: handling device
+ * @xlate: xlate function returning pwrseq instance corresponding to OF args
+ * @data: provider-specific data to be passed to xlate function
+ *
+ * This is a devres-managed version of of_pwrseq_provider_register().
+ * This macros registers OF-specific pwrseq provider. Pwrseq core will call
+ * specified @xlate function to retrieve pwrseq instance corresponding to
+ * device tree arguments. Returned pwrseq provider is automatically
+ * unregistered, without the need to call of_pwrseq_provider_unregister().
+ */
+#define devm_of_pwrseq_provider_register(dev, xlate, data)	\
+	__devm_of_pwrseq_provider_register((dev), THIS_MODULE, (xlate), (data))
+
+struct of_phandle_args;
+
+struct pwrseq_provider *__of_pwrseq_provider_register(struct device *dev,
+	struct module *owner,
+	struct pwrseq * (*of_xlate)(void *data,
+				    struct of_phandle_args *args),
+	void *data);
+struct pwrseq_provider *__devm_of_pwrseq_provider_register(struct device *dev,
+	struct module *owner,
+	struct pwrseq * (*of_xlate)(void *data,
+				    struct of_phandle_args *args),
+	void *data);
+void of_pwrseq_provider_unregister(struct pwrseq_provider *pwrseq_provider);
+
+/**
+ * of_pwrseq_xlate_single() - returns the pwrseq instance from pwrseq provider
+ * @data: the pwrseq provider data
+ * @args: of_phandle_args (not used here)
+ *
+ * Intended to be used by pwrseq provider for the common case where
+ * #pwrseq-cells is 0. For other cases where #pwrseq-cells is greater than '0',
+ * the pwrseq provider should provide a custom of_xlate function that reads the
+ * *args* and returns the appropriate pwrseq.
+ */
+static inline struct pwrseq *of_pwrseq_xlate_single(void *data,
+						    struct of_phandle_args *args)
+{
+	return data;
+}
+
+#endif /* __LINUX_PWRSEQ_DRIVER_H__ */
-- 
2.33.0


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[PATCH v1 03/15] pwrseq: port MMC's pwrseq drivers to new pwrseq subsystem

[Dmitry Baryshkov]

Port MMC's all pwrseq drivers to new pwrseq subsystem.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 .../pwrseq}/mmc-pwrseq-emmc.yaml              |   6 +-
 .../pwrseq}/mmc-pwrseq-sd8787.yaml            |   6 +-
 .../pwrseq}/mmc-pwrseq-simple.yaml            |   6 +-
 drivers/mmc/core/Kconfig                      |  32 ----
 drivers/mmc/core/Makefile                     |   3 -
 drivers/mmc/core/pwrseq_emmc.c                | 120 -------------
 drivers/mmc/core/pwrseq_sd8787.c              | 117 -------------
 drivers/mmc/core/pwrseq_simple.c              | 164 ------------------
 drivers/power/pwrseq/Kconfig                  |  32 ++++
 drivers/power/pwrseq/Makefile                 |   4 +
 drivers/power/pwrseq/pwrseq_emmc.c            | 121 +++++++++++++
 drivers/power/pwrseq/pwrseq_sd8787.c          | 108 ++++++++++++
 drivers/power/pwrseq/pwrseq_simple.c          | 162 +++++++++++++++++
 include/linux/pwrseq/driver.h                 |   4 +-
 14 files changed, 444 insertions(+), 441 deletions(-)
 rename Documentation/devicetree/bindings/{mmc => power/pwrseq}/mmc-pwrseq-emmc.yaml (91%)
 rename Documentation/devicetree/bindings/{mmc => power/pwrseq}/mmc-pwrseq-sd8787.yaml (86%)
 rename Documentation/devicetree/bindings/{mmc => power/pwrseq}/mmc-pwrseq-simple.yaml (92%)
 delete mode 100644 drivers/mmc/core/pwrseq_emmc.c
 delete mode 100644 drivers/mmc/core/pwrseq_sd8787.c
 delete mode 100644 drivers/mmc/core/pwrseq_simple.c
 create mode 100644 drivers/power/pwrseq/pwrseq_emmc.c
 create mode 100644 drivers/power/pwrseq/pwrseq_sd8787.c
 create mode 100644 drivers/power/pwrseq/pwrseq_simple.c

diff --git a/Documentation/devicetree/bindings/mmc/mmc-pwrseq-emmc.yaml b/Documentation/devicetree/bindings/power/pwrseq/mmc-pwrseq-emmc.yaml
similarity index 91%
rename from Documentation/devicetree/bindings/mmc/mmc-pwrseq-emmc.yaml
rename to Documentation/devicetree/bindings/power/pwrseq/mmc-pwrseq-emmc.yaml
index 1fc7e620f328..a5e14e4a19b3 100644
--- a/Documentation/devicetree/bindings/mmc/mmc-pwrseq-emmc.yaml
+++ b/Documentation/devicetree/bindings/power/pwrseq/mmc-pwrseq-emmc.yaml
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0
 %YAML 1.2
 ---
-$id: http://devicetree.org/schemas/mmc/mmc-pwrseq-emmc.yaml#
+$id: http://devicetree.org/schemas/power/pwrseq/mmc-pwrseq-emmc.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
 title: Simple eMMC hardware reset provider binding
@@ -32,6 +32,9 @@ properties:
       reset procedure as described in Jedec 4.4 specification, the
       gpio line should be defined as GPIO_ACTIVE_LOW.
 
+  "#pwrseq-cells":
+    const: 0
+
 required:
   - compatible
   - reset-gpios
@@ -43,6 +46,7 @@ examples:
     #include <dt-bindings/gpio/gpio.h>
     sdhci0_pwrseq {
       compatible = "mmc-pwrseq-emmc";
+      #pwrseq-cells = <0>;
       reset-gpios = <&gpio1 12 GPIO_ACTIVE_LOW>;
     };
 ...
diff --git a/Documentation/devicetree/bindings/mmc/mmc-pwrseq-sd8787.yaml b/Documentation/devicetree/bindings/power/pwrseq/mmc-pwrseq-sd8787.yaml
similarity index 86%
rename from Documentation/devicetree/bindings/mmc/mmc-pwrseq-sd8787.yaml
rename to Documentation/devicetree/bindings/power/pwrseq/mmc-pwrseq-sd8787.yaml
index 9e2396751030..7876be05573d 100644
--- a/Documentation/devicetree/bindings/mmc/mmc-pwrseq-sd8787.yaml
+++ b/Documentation/devicetree/bindings/power/pwrseq/mmc-pwrseq-sd8787.yaml
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0
 %YAML 1.2
 ---
-$id: http://devicetree.org/schemas/mmc/mmc-pwrseq-sd8787.yaml#
+$id: http://devicetree.org/schemas/power/pwrseq/mmc-pwrseq-sd8787.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
 title: Marvell SD8787 power sequence provider binding
@@ -25,6 +25,9 @@ properties:
     description:
       contains a reset GPIO specifier with the default active state
 
+  "#pwrseq-cells":
+    const: 0
+
 required:
   - compatible
   - powerdown-gpios
@@ -37,6 +40,7 @@ examples:
     #include <dt-bindings/gpio/gpio.h>
     wifi_pwrseq: wifi_pwrseq {
       compatible = "mmc-pwrseq-sd8787";
+      #pwrseq-cells = <0>;
       powerdown-gpios = <&twl_gpio 0 GPIO_ACTIVE_LOW>;
       reset-gpios = <&twl_gpio 1 GPIO_ACTIVE_LOW>;
     };
diff --git a/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.yaml b/Documentation/devicetree/bindings/power/pwrseq/mmc-pwrseq-simple.yaml
similarity index 92%
rename from Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.yaml
rename to Documentation/devicetree/bindings/power/pwrseq/mmc-pwrseq-simple.yaml
index 226fb191913d..3eff40fd347e 100644
--- a/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.yaml
+++ b/Documentation/devicetree/bindings/power/pwrseq/mmc-pwrseq-simple.yaml
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0
 %YAML 1.2
 ---
-$id: http://devicetree.org/schemas/mmc/mmc-pwrseq-simple.yaml#
+$id: http://devicetree.org/schemas/power/pwrseq/mmc-pwrseq-simple.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
 title: Simple MMC power sequence provider binding
@@ -47,6 +47,9 @@ properties:
       Delay in us after asserting the reset-gpios (if any)
       during power off of the card.
 
+  "#pwrseq-cells":
+    const: 0
+
 required:
   - compatible
 
@@ -57,6 +60,7 @@ examples:
     #include <dt-bindings/gpio/gpio.h>
     sdhci0_pwrseq {
       compatible = "mmc-pwrseq-simple";
+      #pwrseq-cells = <0>;
       reset-gpios = <&gpio1 12 GPIO_ACTIVE_LOW>;
       clocks = <&clk_32768_ck>;
       clock-names = "ext_clock";
diff --git a/drivers/mmc/core/Kconfig b/drivers/mmc/core/Kconfig
index 6f25c34e4fec..cf7df64ce009 100644
--- a/drivers/mmc/core/Kconfig
+++ b/drivers/mmc/core/Kconfig
@@ -2,38 +2,6 @@
 #
 # MMC core configuration
 #
-config PWRSEQ_EMMC
-	tristate "HW reset support for eMMC"
-	default y
-	depends on OF
-	help
-	  This selects Hardware reset support aka pwrseq-emmc for eMMC
-	  devices. By default this option is set to y.
-
-	  This driver can also be built as a module. If so, the module
-	  will be called pwrseq_emmc.
-
-config PWRSEQ_SD8787
-	tristate "HW reset support for SD8787 BT + Wifi module"
-	depends on OF && (MWIFIEX || BT_MRVL_SDIO || LIBERTAS_SDIO || WILC1000_SDIO)
-	help
-	  This selects hardware reset support for the SD8787 BT + Wifi
-	  module. By default this option is set to n.
-
-	  This driver can also be built as a module. If so, the module
-	  will be called pwrseq_sd8787.
-
-config PWRSEQ_SIMPLE
-	tristate "Simple HW reset support for MMC"
-	default y
-	depends on OF
-	help
-	  This selects simple hardware reset support aka pwrseq-simple for MMC
-	  devices. By default this option is set to y.
-
-	  This driver can also be built as a module. If so, the module
-	  will be called pwrseq_simple.
-
 config MMC_BLOCK
 	tristate "MMC block device driver"
 	depends on BLOCK
diff --git a/drivers/mmc/core/Makefile b/drivers/mmc/core/Makefile
index 6a907736cd7a..322eb69bd00e 100644
--- a/drivers/mmc/core/Makefile
+++ b/drivers/mmc/core/Makefile
@@ -10,9 +10,6 @@ mmc_core-y			:= core.o bus.o host.o \
 				   sdio_cis.o sdio_io.o sdio_irq.o \
 				   slot-gpio.o regulator.o
 mmc_core-$(CONFIG_OF)		+= pwrseq.o
-obj-$(CONFIG_PWRSEQ_SIMPLE)	+= pwrseq_simple.o
-obj-$(CONFIG_PWRSEQ_SD8787)	+= pwrseq_sd8787.o
-obj-$(CONFIG_PWRSEQ_EMMC)	+= pwrseq_emmc.o
 mmc_core-$(CONFIG_DEBUG_FS)	+= debugfs.o
 obj-$(CONFIG_MMC_BLOCK)		+= mmc_block.o
 mmc_block-objs			:= block.o queue.o
diff --git a/drivers/mmc/core/pwrseq_emmc.c b/drivers/mmc/core/pwrseq_emmc.c
deleted file mode 100644
index f6dde9edd7a3..000000000000
--- a/drivers/mmc/core/pwrseq_emmc.c
+++ /dev/null
@@ -1,120 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (C) 2015, Samsung Electronics Co., Ltd.
- *
- * Author: Marek Szyprowski <m.szyprowski@samsung.com>
- *
- * Simple eMMC hardware reset provider
- */
-#include <linux/delay.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/platform_device.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/device.h>
-#include <linux/err.h>
-#include <linux/gpio/consumer.h>
-#include <linux/reboot.h>
-
-#include <linux/mmc/host.h>
-
-#include "pwrseq.h"
-
-struct mmc_pwrseq_emmc {
-	struct mmc_pwrseq pwrseq;
-	struct notifier_block reset_nb;
-	struct gpio_desc *reset_gpio;
-};
-
-#define to_pwrseq_emmc(p) container_of(p, struct mmc_pwrseq_emmc, pwrseq)
-
-static void mmc_pwrseq_emmc_reset(struct mmc_host *host)
-{
-	struct mmc_pwrseq_emmc *pwrseq =  to_pwrseq_emmc(host->pwrseq);
-
-	gpiod_set_value_cansleep(pwrseq->reset_gpio, 1);
-	udelay(1);
-	gpiod_set_value_cansleep(pwrseq->reset_gpio, 0);
-	udelay(200);
-}
-
-static int mmc_pwrseq_emmc_reset_nb(struct notifier_block *this,
-				    unsigned long mode, void *cmd)
-{
-	struct mmc_pwrseq_emmc *pwrseq = container_of(this,
-					struct mmc_pwrseq_emmc, reset_nb);
-	gpiod_set_value(pwrseq->reset_gpio, 1);
-	udelay(1);
-	gpiod_set_value(pwrseq->reset_gpio, 0);
-	udelay(200);
-
-	return NOTIFY_DONE;
-}
-
-static const struct mmc_pwrseq_ops mmc_pwrseq_emmc_ops = {
-	.reset = mmc_pwrseq_emmc_reset,
-};
-
-static int mmc_pwrseq_emmc_probe(struct platform_device *pdev)
-{
-	struct mmc_pwrseq_emmc *pwrseq;
-	struct device *dev = &pdev->dev;
-
-	pwrseq = devm_kzalloc(dev, sizeof(*pwrseq), GFP_KERNEL);
-	if (!pwrseq)
-		return -ENOMEM;
-
-	pwrseq->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
-	if (IS_ERR(pwrseq->reset_gpio))
-		return PTR_ERR(pwrseq->reset_gpio);
-
-	if (!gpiod_cansleep(pwrseq->reset_gpio)) {
-		/*
-		 * register reset handler to ensure emmc reset also from
-		 * emergency_reboot(), priority 255 is the highest priority
-		 * so it will be executed before any system reboot handler.
-		 */
-		pwrseq->reset_nb.notifier_call = mmc_pwrseq_emmc_reset_nb;
-		pwrseq->reset_nb.priority = 255;
-		register_restart_handler(&pwrseq->reset_nb);
-	} else {
-		dev_notice(dev, "EMMC reset pin tied to a sleepy GPIO driver; reset on emergency-reboot disabled\n");
-	}
-
-	pwrseq->pwrseq.ops = &mmc_pwrseq_emmc_ops;
-	pwrseq->pwrseq.dev = dev;
-	pwrseq->pwrseq.owner = THIS_MODULE;
-	platform_set_drvdata(pdev, pwrseq);
-
-	return mmc_pwrseq_register(&pwrseq->pwrseq);
-}
-
-static int mmc_pwrseq_emmc_remove(struct platform_device *pdev)
-{
-	struct mmc_pwrseq_emmc *pwrseq = platform_get_drvdata(pdev);
-
-	unregister_restart_handler(&pwrseq->reset_nb);
-	mmc_pwrseq_unregister(&pwrseq->pwrseq);
-
-	return 0;
-}
-
-static const struct of_device_id mmc_pwrseq_emmc_of_match[] = {
-	{ .compatible = "mmc-pwrseq-emmc",},
-	{/* sentinel */},
-};
-
-MODULE_DEVICE_TABLE(of, mmc_pwrseq_emmc_of_match);
-
-static struct platform_driver mmc_pwrseq_emmc_driver = {
-	.probe = mmc_pwrseq_emmc_probe,
-	.remove = mmc_pwrseq_emmc_remove,
-	.driver = {
-		.name = "pwrseq_emmc",
-		.of_match_table = mmc_pwrseq_emmc_of_match,
-	},
-};
-
-module_platform_driver(mmc_pwrseq_emmc_driver);
-MODULE_LICENSE("GPL v2");
diff --git a/drivers/mmc/core/pwrseq_sd8787.c b/drivers/mmc/core/pwrseq_sd8787.c
deleted file mode 100644
index 2e120ad83020..000000000000
--- a/drivers/mmc/core/pwrseq_sd8787.c
+++ /dev/null
@@ -1,117 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * pwrseq_sd8787.c - power sequence support for Marvell SD8787 BT + Wifi chip
- *
- * Copyright (C) 2016 Matt Ranostay <matt@ranostay.consulting>
- *
- * Based on the original work pwrseq_simple.c
- *  Copyright (C) 2014 Linaro Ltd
- *  Author: Ulf Hansson <ulf.hansson@linaro.org>
- */
-
-#include <linux/delay.h>
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/platform_device.h>
-#include <linux/module.h>
-#include <linux/of.h>
-#include <linux/slab.h>
-#include <linux/device.h>
-#include <linux/err.h>
-#include <linux/gpio/consumer.h>
-
-#include <linux/mmc/host.h>
-
-#include "pwrseq.h"
-
-struct mmc_pwrseq_sd8787 {
-	struct mmc_pwrseq pwrseq;
-	struct gpio_desc *reset_gpio;
-	struct gpio_desc *pwrdn_gpio;
-	u32 reset_pwrdwn_delay_ms;
-};
-
-#define to_pwrseq_sd8787(p) container_of(p, struct mmc_pwrseq_sd8787, pwrseq)
-
-static void mmc_pwrseq_sd8787_pre_power_on(struct mmc_host *host)
-{
-	struct mmc_pwrseq_sd8787 *pwrseq = to_pwrseq_sd8787(host->pwrseq);
-
-	gpiod_set_value_cansleep(pwrseq->reset_gpio, 1);
-
-	msleep(pwrseq->reset_pwrdwn_delay_ms);
-	gpiod_set_value_cansleep(pwrseq->pwrdn_gpio, 1);
-}
-
-static void mmc_pwrseq_sd8787_power_off(struct mmc_host *host)
-{
-	struct mmc_pwrseq_sd8787 *pwrseq = to_pwrseq_sd8787(host->pwrseq);
-
-	gpiod_set_value_cansleep(pwrseq->pwrdn_gpio, 0);
-	gpiod_set_value_cansleep(pwrseq->reset_gpio, 0);
-}
-
-static const struct mmc_pwrseq_ops mmc_pwrseq_sd8787_ops = {
-	.pre_power_on = mmc_pwrseq_sd8787_pre_power_on,
-	.power_off = mmc_pwrseq_sd8787_power_off,
-};
-
-static const u32 sd8787_delay_ms = 300;
-static const u32 wilc1000_delay_ms = 5;
-
-static const struct of_device_id mmc_pwrseq_sd8787_of_match[] = {
-	{ .compatible = "mmc-pwrseq-sd8787", .data = &sd8787_delay_ms },
-	{ .compatible = "mmc-pwrseq-wilc1000", .data = &wilc1000_delay_ms },
-	{/* sentinel */},
-};
-MODULE_DEVICE_TABLE(of, mmc_pwrseq_sd8787_of_match);
-
-static int mmc_pwrseq_sd8787_probe(struct platform_device *pdev)
-{
-	struct mmc_pwrseq_sd8787 *pwrseq;
-	struct device *dev = &pdev->dev;
-	const struct of_device_id *match;
-
-	pwrseq = devm_kzalloc(dev, sizeof(*pwrseq), GFP_KERNEL);
-	if (!pwrseq)
-		return -ENOMEM;
-
-	match = of_match_node(mmc_pwrseq_sd8787_of_match, pdev->dev.of_node);
-	pwrseq->reset_pwrdwn_delay_ms = *(u32 *)match->data;
-
-	pwrseq->pwrdn_gpio = devm_gpiod_get(dev, "powerdown", GPIOD_OUT_LOW);
-	if (IS_ERR(pwrseq->pwrdn_gpio))
-		return PTR_ERR(pwrseq->pwrdn_gpio);
-
-	pwrseq->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
-	if (IS_ERR(pwrseq->reset_gpio))
-		return PTR_ERR(pwrseq->reset_gpio);
-
-	pwrseq->pwrseq.dev = dev;
-	pwrseq->pwrseq.ops = &mmc_pwrseq_sd8787_ops;
-	pwrseq->pwrseq.owner = THIS_MODULE;
-	platform_set_drvdata(pdev, pwrseq);
-
-	return mmc_pwrseq_register(&pwrseq->pwrseq);
-}
-
-static int mmc_pwrseq_sd8787_remove(struct platform_device *pdev)
-{
-	struct mmc_pwrseq_sd8787 *pwrseq = platform_get_drvdata(pdev);
-
-	mmc_pwrseq_unregister(&pwrseq->pwrseq);
-
-	return 0;
-}
-
-static struct platform_driver mmc_pwrseq_sd8787_driver = {
-	.probe = mmc_pwrseq_sd8787_probe,
-	.remove = mmc_pwrseq_sd8787_remove,
-	.driver = {
-		.name = "pwrseq_sd8787",
-		.of_match_table = mmc_pwrseq_sd8787_of_match,
-	},
-};
-
-module_platform_driver(mmc_pwrseq_sd8787_driver);
-MODULE_LICENSE("GPL v2");
diff --git a/drivers/mmc/core/pwrseq_simple.c b/drivers/mmc/core/pwrseq_simple.c
deleted file mode 100644
index ea4d3670560e..000000000000
--- a/drivers/mmc/core/pwrseq_simple.c
+++ /dev/null
@@ -1,164 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- *  Copyright (C) 2014 Linaro Ltd
- *
- * Author: Ulf Hansson <ulf.hansson@linaro.org>
- *
- *  Simple MMC power sequence management
- */
-#include <linux/clk.h>
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/platform_device.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/device.h>
-#include <linux/err.h>
-#include <linux/gpio/consumer.h>
-#include <linux/delay.h>
-#include <linux/property.h>
-
-#include <linux/mmc/host.h>
-
-#include "pwrseq.h"
-
-struct mmc_pwrseq_simple {
-	struct mmc_pwrseq pwrseq;
-	bool clk_enabled;
-	u32 post_power_on_delay_ms;
-	u32 power_off_delay_us;
-	struct clk *ext_clk;
-	struct gpio_descs *reset_gpios;
-};
-
-#define to_pwrseq_simple(p) container_of(p, struct mmc_pwrseq_simple, pwrseq)
-
-static void mmc_pwrseq_simple_set_gpios_value(struct mmc_pwrseq_simple *pwrseq,
-					      int value)
-{
-	struct gpio_descs *reset_gpios = pwrseq->reset_gpios;
-
-	if (!IS_ERR(reset_gpios)) {
-		unsigned long *values;
-		int nvalues = reset_gpios->ndescs;
-
-		values = bitmap_alloc(nvalues, GFP_KERNEL);
-		if (!values)
-			return;
-
-		if (value)
-			bitmap_fill(values, nvalues);
-		else
-			bitmap_zero(values, nvalues);
-
-		gpiod_set_array_value_cansleep(nvalues, reset_gpios->desc,
-					       reset_gpios->info, values);
-
-		kfree(values);
-	}
-}
-
-static void mmc_pwrseq_simple_pre_power_on(struct mmc_host *host)
-{
-	struct mmc_pwrseq_simple *pwrseq = to_pwrseq_simple(host->pwrseq);
-
-	if (!IS_ERR(pwrseq->ext_clk) && !pwrseq->clk_enabled) {
-		clk_prepare_enable(pwrseq->ext_clk);
-		pwrseq->clk_enabled = true;
-	}
-
-	mmc_pwrseq_simple_set_gpios_value(pwrseq, 1);
-}
-
-static void mmc_pwrseq_simple_post_power_on(struct mmc_host *host)
-{
-	struct mmc_pwrseq_simple *pwrseq = to_pwrseq_simple(host->pwrseq);
-
-	mmc_pwrseq_simple_set_gpios_value(pwrseq, 0);
-
-	if (pwrseq->post_power_on_delay_ms)
-		msleep(pwrseq->post_power_on_delay_ms);
-}
-
-static void mmc_pwrseq_simple_power_off(struct mmc_host *host)
-{
-	struct mmc_pwrseq_simple *pwrseq = to_pwrseq_simple(host->pwrseq);
-
-	mmc_pwrseq_simple_set_gpios_value(pwrseq, 1);
-
-	if (pwrseq->power_off_delay_us)
-		usleep_range(pwrseq->power_off_delay_us,
-			2 * pwrseq->power_off_delay_us);
-
-	if (!IS_ERR(pwrseq->ext_clk) && pwrseq->clk_enabled) {
-		clk_disable_unprepare(pwrseq->ext_clk);
-		pwrseq->clk_enabled = false;
-	}
-}
-
-static const struct mmc_pwrseq_ops mmc_pwrseq_simple_ops = {
-	.pre_power_on = mmc_pwrseq_simple_pre_power_on,
-	.post_power_on = mmc_pwrseq_simple_post_power_on,
-	.power_off = mmc_pwrseq_simple_power_off,
-};
-
-static const struct of_device_id mmc_pwrseq_simple_of_match[] = {
-	{ .compatible = "mmc-pwrseq-simple",},
-	{/* sentinel */},
-};
-MODULE_DEVICE_TABLE(of, mmc_pwrseq_simple_of_match);
-
-static int mmc_pwrseq_simple_probe(struct platform_device *pdev)
-{
-	struct mmc_pwrseq_simple *pwrseq;
-	struct device *dev = &pdev->dev;
-
-	pwrseq = devm_kzalloc(dev, sizeof(*pwrseq), GFP_KERNEL);
-	if (!pwrseq)
-		return -ENOMEM;
-
-	pwrseq->ext_clk = devm_clk_get(dev, "ext_clock");
-	if (IS_ERR(pwrseq->ext_clk) && PTR_ERR(pwrseq->ext_clk) != -ENOENT)
-		return PTR_ERR(pwrseq->ext_clk);
-
-	pwrseq->reset_gpios = devm_gpiod_get_array(dev, "reset",
-							GPIOD_OUT_HIGH);
-	if (IS_ERR(pwrseq->reset_gpios) &&
-	    PTR_ERR(pwrseq->reset_gpios) != -ENOENT &&
-	    PTR_ERR(pwrseq->reset_gpios) != -ENOSYS) {
-		return PTR_ERR(pwrseq->reset_gpios);
-	}
-
-	device_property_read_u32(dev, "post-power-on-delay-ms",
-				 &pwrseq->post_power_on_delay_ms);
-	device_property_read_u32(dev, "power-off-delay-us",
-				 &pwrseq->power_off_delay_us);
-
-	pwrseq->pwrseq.dev = dev;
-	pwrseq->pwrseq.ops = &mmc_pwrseq_simple_ops;
-	pwrseq->pwrseq.owner = THIS_MODULE;
-	platform_set_drvdata(pdev, pwrseq);
-
-	return mmc_pwrseq_register(&pwrseq->pwrseq);
-}
-
-static int mmc_pwrseq_simple_remove(struct platform_device *pdev)
-{
-	struct mmc_pwrseq_simple *pwrseq = platform_get_drvdata(pdev);
-
-	mmc_pwrseq_unregister(&pwrseq->pwrseq);
-
-	return 0;
-}
-
-static struct platform_driver mmc_pwrseq_simple_driver = {
-	.probe = mmc_pwrseq_simple_probe,
-	.remove = mmc_pwrseq_simple_remove,
-	.driver = {
-		.name = "pwrseq_simple",
-		.of_match_table = mmc_pwrseq_simple_of_match,
-	},
-};
-
-module_platform_driver(mmc_pwrseq_simple_driver);
-MODULE_LICENSE("GPL v2");
diff --git a/drivers/power/pwrseq/Kconfig b/drivers/power/pwrseq/Kconfig
index dab8f4d860fe..1985f13d9193 100644
--- a/drivers/power/pwrseq/Kconfig
+++ b/drivers/power/pwrseq/Kconfig
@@ -11,4 +11,36 @@ menuconfig PWRSEQ
 
 if PWRSEQ
 
+config PWRSEQ_EMMC
+	tristate "HW reset support for eMMC"
+	default y
+	depends on OF
+	help
+	  This selects Hardware reset support aka pwrseq-emmc for eMMC
+	  devices. By default this option is set to y.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called pwrseq_emmc.
+
+config PWRSEQ_SD8787
+	tristate "HW reset support for SD8787 BT + Wifi module"
+	depends on OF
+	help
+	  This selects hardware reset support for the SD8787 BT + Wifi
+	  module. By default this option is set to n.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called pwrseq_sd8787.
+
+config PWRSEQ_SIMPLE
+	tristate "Simple HW reset support"
+	default y
+	depends on OF
+	help
+	  This selects simple hardware reset support aka pwrseq-simple.
+	  By default this option is set to y.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called pwrseq_simple.
+
 endif
diff --git a/drivers/power/pwrseq/Makefile b/drivers/power/pwrseq/Makefile
index 108429ff6445..6f359d228843 100644
--- a/drivers/power/pwrseq/Makefile
+++ b/drivers/power/pwrseq/Makefile
@@ -4,3 +4,7 @@
 #
 
 obj-$(CONFIG_PWRSEQ) += core.o
+
+obj-$(CONFIG_PWRSEQ_EMMC)	+= pwrseq_emmc.o
+obj-$(CONFIG_PWRSEQ_SD8787)	+= pwrseq_sd8787.o
+obj-$(CONFIG_PWRSEQ_SIMPLE)	+= pwrseq_simple.o
diff --git a/drivers/power/pwrseq/pwrseq_emmc.c b/drivers/power/pwrseq/pwrseq_emmc.c
new file mode 100644
index 000000000000..954bbb44979d
--- /dev/null
+++ b/drivers/power/pwrseq/pwrseq_emmc.c
@@ -0,0 +1,121 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2015, Samsung Electronics Co., Ltd.
+ *
+ * Author: Marek Szyprowski <m.szyprowski@samsung.com>
+ *
+ * Simple eMMC hardware reset provider
+ */
+#include <linux/delay.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/reboot.h>
+#include <linux/pwrseq/driver.h>
+
+struct pwrseq_emmc {
+	struct notifier_block reset_nb;
+	struct gpio_desc *reset_gpio;
+};
+
+static void pwrseq_ereset(struct pwrseq *pwrseq)
+{
+	struct pwrseq_emmc *pwrseq_emmc = pwrseq_get_drvdata(pwrseq);
+
+	gpiod_set_value_cansleep(pwrseq_emmc->reset_gpio, 1);
+	udelay(1);
+	gpiod_set_value_cansleep(pwrseq_emmc->reset_gpio, 0);
+	udelay(200);
+}
+
+static int pwrseq_ereset_nb(struct notifier_block *this,
+				    unsigned long mode, void *cmd)
+{
+	struct pwrseq_emmc *pwrseq_emmc = container_of(this,
+					struct pwrseq_emmc, reset_nb);
+	gpiod_set_value(pwrseq_emmc->reset_gpio, 1);
+	udelay(1);
+	gpiod_set_value(pwrseq_emmc->reset_gpio, 0);
+	udelay(200);
+
+	return NOTIFY_DONE;
+}
+
+static const struct pwrseq_ops pwrseq_eops = {
+	.reset = pwrseq_ereset,
+};
+
+static int pwrseq_eprobe(struct platform_device *pdev)
+{
+	struct pwrseq_emmc *pwrseq_emmc;
+	struct pwrseq *pwrseq;
+	struct pwrseq_provider *provider;
+	struct device *dev = &pdev->dev;
+
+	pwrseq_emmc = devm_kzalloc(dev, sizeof(*pwrseq_emmc), GFP_KERNEL);
+	if (!pwrseq_emmc)
+		return -ENOMEM;
+
+	pwrseq_emmc->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(pwrseq_emmc->reset_gpio))
+		return PTR_ERR(pwrseq_emmc->reset_gpio);
+
+	if (!gpiod_cansleep(pwrseq_emmc->reset_gpio)) {
+		/*
+		 * register reset handler to ensure emmc reset also from
+		 * emergency_reboot(), priority 255 is the highest priority
+		 * so it will be executed before any system reboot handler.
+		 */
+		pwrseq_emmc->reset_nb.notifier_call = pwrseq_ereset_nb;
+		pwrseq_emmc->reset_nb.priority = 255;
+		register_restart_handler(&pwrseq_emmc->reset_nb);
+	} else {
+		dev_notice(dev, "EMMC reset pin tied to a sleepy GPIO driver; reset on emergency-reboot disabled\n");
+	}
+
+	platform_set_drvdata(pdev, pwrseq_emmc);
+
+	pwrseq = devm_pwrseq_create(dev, &pwrseq_eops);
+	if (IS_ERR(pwrseq))
+		return PTR_ERR(pwrseq);
+
+	pwrseq_set_drvdata(pwrseq, pwrseq_emmc);
+
+	provider = devm_of_pwrseq_provider_register(dev, of_pwrseq_xlate_single, pwrseq);
+
+	return PTR_ERR_OR_ZERO(provider);
+}
+
+static int pwrseq_eremove(struct platform_device *pdev)
+{
+	struct pwrseq_emmc *pwrseq_emmc = platform_get_drvdata(pdev);
+
+	unregister_restart_handler(&pwrseq_emmc->reset_nb);
+
+	return 0;
+}
+
+static const struct of_device_id pwrseq_eof_match[] = {
+	{ .compatible = "mmc-pwrseq-emmc",},
+	{/* sentinel */},
+};
+
+MODULE_DEVICE_TABLE(of, pwrseq_eof_match);
+
+static struct platform_driver pwrseq_edriver = {
+	.probe = pwrseq_eprobe,
+	.remove = pwrseq_eremove,
+	.driver = {
+		.name = "pwrseq_emmc",
+		.of_match_table = pwrseq_eof_match,
+	},
+};
+
+module_platform_driver(pwrseq_edriver);
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/power/pwrseq/pwrseq_sd8787.c b/drivers/power/pwrseq/pwrseq_sd8787.c
new file mode 100644
index 000000000000..aeb80327f40d
--- /dev/null
+++ b/drivers/power/pwrseq/pwrseq_sd8787.c
@@ -0,0 +1,108 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * pwrseq_sd8787.c - power sequence support for Marvell SD8787 BT + Wifi chip
+ *
+ * Copyright (C) 2016 Matt Ranostay <matt@ranostay.consulting>
+ *
+ * Based on the original work pwrseq_sd8787.c
+ *  Copyright (C) 2014 Linaro Ltd
+ *  Author: Ulf Hansson <ulf.hansson@linaro.org>
+ */
+
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/of_device.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+
+#include <linux/pwrseq/driver.h>
+
+struct pwrseq_sd8787 {
+	struct gpio_desc *reset_gpio;
+	struct gpio_desc *pwrdn_gpio;
+	u32 reset_pwrdwn_delay_ms;
+};
+
+static int pwrseq_sd8787_pre_power_on(struct pwrseq *pwrseq)
+{
+	struct pwrseq_sd8787 *pwrseq_sd8787 = pwrseq_get_drvdata(pwrseq);
+
+	gpiod_set_value_cansleep(pwrseq_sd8787->reset_gpio, 1);
+
+	msleep(pwrseq_sd8787->reset_pwrdwn_delay_ms);
+	gpiod_set_value_cansleep(pwrseq_sd8787->pwrdn_gpio, 1);
+
+	return 0;
+}
+
+static void pwrseq_sd8787_power_off(struct pwrseq *pwrseq)
+{
+	struct pwrseq_sd8787 *pwrseq_sd8787 = pwrseq_get_drvdata(pwrseq);
+
+	gpiod_set_value_cansleep(pwrseq_sd8787->pwrdn_gpio, 0);
+	gpiod_set_value_cansleep(pwrseq_sd8787->reset_gpio, 0);
+}
+
+static const struct pwrseq_ops pwrseq_sd8787_ops = {
+	.pre_power_on = pwrseq_sd8787_pre_power_on,
+	.power_off = pwrseq_sd8787_power_off,
+};
+
+static const u32 sd8787_delay_ms = 300;
+static const u32 wilc1000_delay_ms = 5;
+
+static const struct of_device_id pwrseq_sd8787_of_match[] = {
+	{ .compatible = "mmc-pwrseq-sd8787", .data = &sd8787_delay_ms },
+	{ .compatible = "mmc-pwrseq-wilc1000", .data = &wilc1000_delay_ms },
+	{/* sentinel */},
+};
+MODULE_DEVICE_TABLE(of, pwrseq_sd8787_of_match);
+
+static int pwrseq_sd8787_probe(struct platform_device *pdev)
+{
+	struct pwrseq_sd8787 *pwrseq_sd8787;
+	struct pwrseq *pwrseq;
+	struct pwrseq_provider *provider;
+	struct device *dev = &pdev->dev;
+
+	pwrseq_sd8787 = devm_kzalloc(dev, sizeof(*pwrseq_sd8787), GFP_KERNEL);
+	if (!pwrseq_sd8787)
+		return -ENOMEM;
+
+	pwrseq_sd8787->reset_pwrdwn_delay_ms = *(u32 *)of_device_get_match_data(dev);
+
+	pwrseq_sd8787->pwrdn_gpio = devm_gpiod_get(dev, "powerdown", GPIOD_OUT_LOW);
+	if (IS_ERR(pwrseq_sd8787->pwrdn_gpio))
+		return PTR_ERR(pwrseq_sd8787->pwrdn_gpio);
+
+	pwrseq_sd8787->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(pwrseq_sd8787->reset_gpio))
+		return PTR_ERR(pwrseq_sd8787->reset_gpio);
+
+	pwrseq = devm_pwrseq_create(dev, &pwrseq_sd8787_ops);
+	if (IS_ERR(pwrseq))
+		return PTR_ERR(pwrseq);
+
+	pwrseq_set_drvdata(pwrseq, pwrseq_sd8787);
+
+	provider = devm_of_pwrseq_provider_register(dev, of_pwrseq_xlate_single, pwrseq);
+
+	return PTR_ERR_OR_ZERO(provider);
+}
+
+static struct platform_driver pwrseq_sd8787_driver = {
+	.probe = pwrseq_sd8787_probe,
+	.driver = {
+		.name = "pwrseq_sd8787",
+		.of_match_table = pwrseq_sd8787_of_match,
+	},
+};
+
+module_platform_driver(pwrseq_sd8787_driver);
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/power/pwrseq/pwrseq_simple.c b/drivers/power/pwrseq/pwrseq_simple.c
new file mode 100644
index 000000000000..4889fd5a11e0
--- /dev/null
+++ b/drivers/power/pwrseq/pwrseq_simple.c
@@ -0,0 +1,162 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  Copyright (C) 2014 Linaro Ltd
+ *
+ * Author: Ulf Hansson <ulf.hansson@linaro.org>
+ *
+ *  Simple MMC power sequence management
+ */
+#include <linux/clk.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/delay.h>
+#include <linux/property.h>
+#include <linux/pwrseq/driver.h>
+
+struct pwrseq_simple {
+	bool clk_enabled;
+	u32 post_power_on_delay_ms;
+	u32 power_off_delay_us;
+	struct clk *ext_clk;
+	struct gpio_descs *reset_gpios;
+};
+
+static int pwrseq_simple_set_gpios_value(struct pwrseq_simple *pwrseq_simple,
+					 int value)
+{
+	struct gpio_descs *reset_gpios = pwrseq_simple->reset_gpios;
+	unsigned long *values;
+	int nvalues;
+	int ret;
+
+	if (IS_ERR(reset_gpios))
+		return PTR_ERR(reset_gpios);
+
+	nvalues = reset_gpios->ndescs;
+
+	values = bitmap_alloc(nvalues, GFP_KERNEL);
+	if (!values)
+		return -ENOMEM;
+
+	if (value)
+		bitmap_fill(values, nvalues);
+	else
+		bitmap_zero(values, nvalues);
+
+	ret = gpiod_set_array_value_cansleep(nvalues, reset_gpios->desc,
+				       reset_gpios->info, values);
+	kfree(values);
+
+	return ret;
+}
+
+static int pwrseq_simple_pre_power_on(struct pwrseq *pwrseq)
+{
+	struct pwrseq_simple *pwrseq_simple = pwrseq_get_drvdata(pwrseq);
+
+	if (!IS_ERR(pwrseq_simple->ext_clk) && !pwrseq_simple->clk_enabled) {
+		clk_prepare_enable(pwrseq_simple->ext_clk);
+		pwrseq_simple->clk_enabled = true;
+	}
+
+	return pwrseq_simple_set_gpios_value(pwrseq_simple, 1);
+}
+
+static int pwrseq_simple_power_on(struct pwrseq *pwrseq)
+{
+	struct pwrseq_simple *pwrseq_simple = pwrseq_get_drvdata(pwrseq);
+	int ret;
+
+	ret = pwrseq_simple_set_gpios_value(pwrseq_simple, 0);
+	if (ret)
+		return ret;
+
+	if (pwrseq_simple->post_power_on_delay_ms)
+		msleep(pwrseq_simple->post_power_on_delay_ms);
+
+	return 0;
+}
+
+static void pwrseq_simple_power_off(struct pwrseq *pwrseq)
+{
+	struct pwrseq_simple *pwrseq_simple = pwrseq_get_drvdata(pwrseq);
+
+	pwrseq_simple_set_gpios_value(pwrseq_simple, 1);
+
+	if (pwrseq_simple->power_off_delay_us)
+		usleep_range(pwrseq_simple->power_off_delay_us,
+			2 * pwrseq_simple->power_off_delay_us);
+
+	if (!IS_ERR(pwrseq_simple->ext_clk) && pwrseq_simple->clk_enabled) {
+		clk_disable_unprepare(pwrseq_simple->ext_clk);
+		pwrseq_simple->clk_enabled = false;
+	}
+}
+
+static const struct pwrseq_ops pwrseq_simple_ops = {
+	.pre_power_on = pwrseq_simple_pre_power_on,
+	.power_on = pwrseq_simple_power_on,
+	.power_off = pwrseq_simple_power_off,
+};
+
+static const struct of_device_id pwrseq_simple_of_match[] = {
+	{ .compatible = "mmc-pwrseq-simple",}, /* MMC-specific compatible */
+	{/* sentinel */},
+};
+MODULE_DEVICE_TABLE(of, pwrseq_simple_of_match);
+
+static int pwrseq_simple_probe(struct platform_device *pdev)
+{
+	struct pwrseq_simple *pwrseq_simple;
+	struct pwrseq *pwrseq;
+	struct pwrseq_provider *provider;
+	struct device *dev = &pdev->dev;
+
+	pwrseq_simple = devm_kzalloc(dev, sizeof(*pwrseq_simple), GFP_KERNEL);
+	if (!pwrseq_simple)
+		return -ENOMEM;
+
+	pwrseq_simple->ext_clk = devm_clk_get(dev, "ext_clock");
+	if (IS_ERR(pwrseq_simple->ext_clk) && PTR_ERR(pwrseq_simple->ext_clk) != -ENOENT)
+		return PTR_ERR(pwrseq_simple->ext_clk);
+
+	pwrseq_simple->reset_gpios = devm_gpiod_get_array(dev, "reset",
+							GPIOD_OUT_HIGH);
+	if (IS_ERR(pwrseq_simple->reset_gpios) &&
+	    PTR_ERR(pwrseq_simple->reset_gpios) != -ENOENT &&
+	    PTR_ERR(pwrseq_simple->reset_gpios) != -ENOSYS) {
+		return PTR_ERR(pwrseq_simple->reset_gpios);
+	}
+
+	device_property_read_u32(dev, "post-power-on-delay-ms",
+				 &pwrseq_simple->post_power_on_delay_ms);
+	device_property_read_u32(dev, "power-off-delay-us",
+				 &pwrseq_simple->power_off_delay_us);
+
+	pwrseq = devm_pwrseq_create(dev, &pwrseq_simple_ops);
+	if (IS_ERR(pwrseq))
+		return PTR_ERR(pwrseq);
+
+	pwrseq_set_drvdata(pwrseq, pwrseq_simple);
+
+	provider = devm_of_pwrseq_provider_register(dev, of_pwrseq_xlate_single, pwrseq);
+
+	return PTR_ERR_OR_ZERO(provider);
+}
+
+static struct platform_driver pwrseq_simple_driver = {
+	.probe = pwrseq_simple_probe,
+	.driver = {
+		.name = "pwrseq_simple",
+		.of_match_table = pwrseq_simple_of_match,
+	},
+};
+
+module_platform_driver(pwrseq_simple_driver);
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/pwrseq/driver.h b/include/linux/pwrseq/driver.h
index bdb8a25a8504..0ca1d0311ab6 100644
--- a/include/linux/pwrseq/driver.h
+++ b/include/linux/pwrseq/driver.h
@@ -57,7 +57,7 @@ struct pwrseq *__devm_pwrseq_create(struct device *dev, struct module *owner, co
  *
  * Return: created instance or the wrapped error code.
  */
-#define pwrseq_create(dev, ops, data) __pwrseq_create((dev), THIS_MODULE, (ops))
+#define pwrseq_create(dev, ops) __pwrseq_create((dev), THIS_MODULE, (ops))
 
 /**
  * devm_pwrseq_create() - devres-managed version of pwrseq_create
@@ -71,7 +71,7 @@ struct pwrseq *__devm_pwrseq_create(struct device *dev, struct module *owner, co
  *
  * Return: created instance or the wrapped error code.
  */
-#define devm_pwrseq_create(dev, ops, data) __devm_pwrseq_create((dev), THIS_MODULE, (ops))
+#define devm_pwrseq_create(dev, ops) __devm_pwrseq_create((dev), THIS_MODULE, (ops))
 
 void pwrseq_destroy(struct pwrseq *pwrseq);
 
-- 
2.33.0


_______________________________________________
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ath10k@lists.infradead.org
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[PATCH v1 04/15] mmc: core: switch to new pwrseq subsystem

[Dmitry Baryshkov]

Drop old MMC pwrseq code and use new pwrseq subsystem instead.
Individual drivers are already ported to new subsystem.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/mmc/core/Makefile   |   1 -
 drivers/mmc/core/core.c     |   9 ++-
 drivers/mmc/core/host.c     |   8 ++-
 drivers/mmc/core/mmc.c      |   3 +-
 drivers/mmc/core/pwrseq.c   | 117 ------------------------------------
 drivers/mmc/core/pwrseq.h   |  58 ------------------
 drivers/power/pwrseq/core.c |   8 +++
 include/linux/mmc/host.h    |   4 +-
 8 files changed, 20 insertions(+), 188 deletions(-)
 delete mode 100644 drivers/mmc/core/pwrseq.c
 delete mode 100644 drivers/mmc/core/pwrseq.h

diff --git a/drivers/mmc/core/Makefile b/drivers/mmc/core/Makefile
index 322eb69bd00e..a504d873cf8e 100644
--- a/drivers/mmc/core/Makefile
+++ b/drivers/mmc/core/Makefile
@@ -9,7 +9,6 @@ mmc_core-y			:= core.o bus.o host.o \
 				   sdio.o sdio_ops.o sdio_bus.o \
 				   sdio_cis.o sdio_io.o sdio_irq.o \
 				   slot-gpio.o regulator.o
-mmc_core-$(CONFIG_OF)		+= pwrseq.o
 mmc_core-$(CONFIG_DEBUG_FS)	+= debugfs.o
 obj-$(CONFIG_MMC_BLOCK)		+= mmc_block.o
 mmc_block-objs			:= block.o queue.o
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 240c5af793dc..c4b08067ab9f 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -41,7 +41,6 @@
 #include "bus.h"
 #include "host.h"
 #include "sdio_bus.h"
-#include "pwrseq.h"
 
 #include "mmc_ops.h"
 #include "sd_ops.h"
@@ -1322,7 +1321,7 @@ void mmc_power_up(struct mmc_host *host, u32 ocr)
 	if (host->ios.power_mode == MMC_POWER_ON)
 		return;
 
-	mmc_pwrseq_pre_power_on(host);
+	pwrseq_pre_power_on(host->pwrseq);
 
 	host->ios.vdd = fls(ocr) - 1;
 	host->ios.power_mode = MMC_POWER_UP;
@@ -1337,7 +1336,7 @@ void mmc_power_up(struct mmc_host *host, u32 ocr)
 	 */
 	mmc_delay(host->ios.power_delay_ms);
 
-	mmc_pwrseq_post_power_on(host);
+	pwrseq_power_on(host->pwrseq);
 
 	host->ios.clock = host->f_init;
 
@@ -1356,7 +1355,7 @@ void mmc_power_off(struct mmc_host *host)
 	if (host->ios.power_mode == MMC_POWER_OFF)
 		return;
 
-	mmc_pwrseq_power_off(host);
+	pwrseq_power_off(host->pwrseq);
 
 	host->ios.clock = 0;
 	host->ios.vdd = 0;
@@ -1986,7 +1985,7 @@ EXPORT_SYMBOL(mmc_set_blocklen);
 
 static void mmc_hw_reset_for_init(struct mmc_host *host)
 {
-	mmc_pwrseq_reset(host);
+	pwrseq_reset(host->pwrseq);
 
 	if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
 		return;
diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
index d4683b1d263f..aa5326db7c60 100644
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -28,7 +28,6 @@
 #include "crypto.h"
 #include "host.h"
 #include "slot-gpio.h"
-#include "pwrseq.h"
 #include "sdio_ops.h"
 
 #define cls_dev_to_mmc_host(d)	container_of(d, struct mmc_host, class_dev)
@@ -422,7 +421,11 @@ int mmc_of_parse(struct mmc_host *host)
 	device_property_read_u32(dev, "post-power-on-delay-ms",
 				 &host->ios.power_delay_ms);
 
-	return mmc_pwrseq_alloc(host);
+	host->pwrseq = devm_pwrseq_get(dev, "mmc");
+	if (IS_ERR(host->pwrseq))
+		return PTR_ERR(host->pwrseq);
+
+	return 0;
 }
 
 EXPORT_SYMBOL(mmc_of_parse);
@@ -641,7 +644,6 @@ EXPORT_SYMBOL(mmc_remove_host);
  */
 void mmc_free_host(struct mmc_host *host)
 {
-	mmc_pwrseq_free(host);
 	put_device(&host->class_dev);
 }
 
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 29e58ffae379..d7e1c083fa12 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -24,7 +24,6 @@
 #include "mmc_ops.h"
 #include "quirks.h"
 #include "sd_ops.h"
-#include "pwrseq.h"
 
 #define DEFAULT_CMD6_TIMEOUT_MS	500
 #define MIN_CACHE_EN_TIMEOUT_MS 1600
@@ -2222,7 +2221,7 @@ static int _mmc_hw_reset(struct mmc_host *host)
 	} else {
 		/* Do a brute force power cycle */
 		mmc_power_cycle(host, card->ocr);
-		mmc_pwrseq_reset(host);
+		pwrseq_reset(host->pwrseq);
 	}
 	return mmc_init_card(host, card->ocr, card);
 }
diff --git a/drivers/mmc/core/pwrseq.c b/drivers/mmc/core/pwrseq.c
deleted file mode 100644
index ef675f364bf0..000000000000
--- a/drivers/mmc/core/pwrseq.c
+++ /dev/null
@@ -1,117 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- *  Copyright (C) 2014 Linaro Ltd
- *
- * Author: Ulf Hansson <ulf.hansson@linaro.org>
- *
- *  MMC power sequence management
- */
-#include <linux/kernel.h>
-#include <linux/err.h>
-#include <linux/module.h>
-#include <linux/of.h>
-
-#include <linux/mmc/host.h>
-
-#include "pwrseq.h"
-
-static DEFINE_MUTEX(pwrseq_list_mutex);
-static LIST_HEAD(pwrseq_list);
-
-int mmc_pwrseq_alloc(struct mmc_host *host)
-{
-	struct device_node *np;
-	struct mmc_pwrseq *p;
-
-	np = of_parse_phandle(host->parent->of_node, "mmc-pwrseq", 0);
-	if (!np)
-		return 0;
-
-	mutex_lock(&pwrseq_list_mutex);
-	list_for_each_entry(p, &pwrseq_list, pwrseq_node) {
-		if (p->dev->of_node == np) {
-			if (!try_module_get(p->owner))
-				dev_err(host->parent,
-					"increasing module refcount failed\n");
-			else
-				host->pwrseq = p;
-
-			break;
-		}
-	}
-
-	of_node_put(np);
-	mutex_unlock(&pwrseq_list_mutex);
-
-	if (!host->pwrseq)
-		return -EPROBE_DEFER;
-
-	dev_info(host->parent, "allocated mmc-pwrseq\n");
-
-	return 0;
-}
-
-void mmc_pwrseq_pre_power_on(struct mmc_host *host)
-{
-	struct mmc_pwrseq *pwrseq = host->pwrseq;
-
-	if (pwrseq && pwrseq->ops->pre_power_on)
-		pwrseq->ops->pre_power_on(host);
-}
-
-void mmc_pwrseq_post_power_on(struct mmc_host *host)
-{
-	struct mmc_pwrseq *pwrseq = host->pwrseq;
-
-	if (pwrseq && pwrseq->ops->post_power_on)
-		pwrseq->ops->post_power_on(host);
-}
-
-void mmc_pwrseq_power_off(struct mmc_host *host)
-{
-	struct mmc_pwrseq *pwrseq = host->pwrseq;
-
-	if (pwrseq && pwrseq->ops->power_off)
-		pwrseq->ops->power_off(host);
-}
-
-void mmc_pwrseq_reset(struct mmc_host *host)
-{
-	struct mmc_pwrseq *pwrseq = host->pwrseq;
-
-	if (pwrseq && pwrseq->ops->reset)
-		pwrseq->ops->reset(host);
-}
-
-void mmc_pwrseq_free(struct mmc_host *host)
-{
-	struct mmc_pwrseq *pwrseq = host->pwrseq;
-
-	if (pwrseq) {
-		module_put(pwrseq->owner);
-		host->pwrseq = NULL;
-	}
-}
-
-int mmc_pwrseq_register(struct mmc_pwrseq *pwrseq)
-{
-	if (!pwrseq || !pwrseq->ops || !pwrseq->dev)
-		return -EINVAL;
-
-	mutex_lock(&pwrseq_list_mutex);
-	list_add(&pwrseq->pwrseq_node, &pwrseq_list);
-	mutex_unlock(&pwrseq_list_mutex);
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(mmc_pwrseq_register);
-
-void mmc_pwrseq_unregister(struct mmc_pwrseq *pwrseq)
-{
-	if (pwrseq) {
-		mutex_lock(&pwrseq_list_mutex);
-		list_del(&pwrseq->pwrseq_node);
-		mutex_unlock(&pwrseq_list_mutex);
-	}
-}
-EXPORT_SYMBOL_GPL(mmc_pwrseq_unregister);
diff --git a/drivers/mmc/core/pwrseq.h b/drivers/mmc/core/pwrseq.h
deleted file mode 100644
index f3bb103db9ad..000000000000
--- a/drivers/mmc/core/pwrseq.h
+++ /dev/null
@@ -1,58 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * Copyright (C) 2014 Linaro Ltd
- *
- * Author: Ulf Hansson <ulf.hansson@linaro.org>
- */
-#ifndef _MMC_CORE_PWRSEQ_H
-#define _MMC_CORE_PWRSEQ_H
-
-#include <linux/types.h>
-
-struct mmc_host;
-struct device;
-struct module;
-
-struct mmc_pwrseq_ops {
-	void (*pre_power_on)(struct mmc_host *host);
-	void (*post_power_on)(struct mmc_host *host);
-	void (*power_off)(struct mmc_host *host);
-	void (*reset)(struct mmc_host *host);
-};
-
-struct mmc_pwrseq {
-	const struct mmc_pwrseq_ops *ops;
-	struct device *dev;
-	struct list_head pwrseq_node;
-	struct module *owner;
-};
-
-#ifdef CONFIG_OF
-
-int mmc_pwrseq_register(struct mmc_pwrseq *pwrseq);
-void mmc_pwrseq_unregister(struct mmc_pwrseq *pwrseq);
-
-int mmc_pwrseq_alloc(struct mmc_host *host);
-void mmc_pwrseq_pre_power_on(struct mmc_host *host);
-void mmc_pwrseq_post_power_on(struct mmc_host *host);
-void mmc_pwrseq_power_off(struct mmc_host *host);
-void mmc_pwrseq_reset(struct mmc_host *host);
-void mmc_pwrseq_free(struct mmc_host *host);
-
-#else
-
-static inline int mmc_pwrseq_register(struct mmc_pwrseq *pwrseq)
-{
-	return -ENOSYS;
-}
-static inline void mmc_pwrseq_unregister(struct mmc_pwrseq *pwrseq) {}
-static inline int mmc_pwrseq_alloc(struct mmc_host *host) { return 0; }
-static inline void mmc_pwrseq_pre_power_on(struct mmc_host *host) {}
-static inline void mmc_pwrseq_post_power_on(struct mmc_host *host) {}
-static inline void mmc_pwrseq_power_off(struct mmc_host *host) {}
-static inline void mmc_pwrseq_reset(struct mmc_host *host) {}
-static inline void mmc_pwrseq_free(struct mmc_host *host) {}
-
-#endif
-
-#endif
diff --git a/drivers/power/pwrseq/core.c b/drivers/power/pwrseq/core.c
index d29b4b97b95c..0aaba4e79a44 100644
--- a/drivers/power/pwrseq/core.c
+++ b/drivers/power/pwrseq/core.c
@@ -68,6 +68,14 @@ static struct pwrseq *_of_pwrseq_get(struct device *dev, const char *id)
 
 	snprintf(prop_name, sizeof(prop_name), "%s-pwrseq", id);
 	ret = of_parse_phandle_with_args(dev->of_node, prop_name, "#pwrseq-cells", 0, &args);
+
+	/*
+	 * Parsing failed. Try locating old bindings for mmc-pwrseq, which did
+	 * not use #pwrseq-cells.
+	 */
+	if (ret == -EINVAL && !strcmp(id, "mmc"))
+		ret = of_parse_phandle_with_args(dev->of_node, prop_name, NULL, 0, &args);
+
 	if (ret == -ENOENT)
 		return NULL;
 	else if (ret < 0)
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 0c0c9a0fdf57..f5daee6c1d7b 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -16,6 +16,7 @@
 #include <linux/mmc/pm.h>
 #include <linux/dma-direction.h>
 #include <linux/keyslot-manager.h>
+#include <linux/pwrseq/consumer.h>
 
 struct mmc_ios {
 	unsigned int	clock;			/* clock rate */
@@ -278,7 +279,6 @@ struct mmc_context_info {
 };
 
 struct regulator;
-struct mmc_pwrseq;
 
 struct mmc_supply {
 	struct regulator *vmmc;		/* Card power supply */
@@ -294,7 +294,7 @@ struct mmc_host {
 	struct device		class_dev;
 	int			index;
 	const struct mmc_host_ops *ops;
-	struct mmc_pwrseq	*pwrseq;
+	struct pwrseq		*pwrseq;
 	unsigned int		f_min;
 	unsigned int		f_max;
 	unsigned int		f_init;
-- 
2.33.0


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[PATCH v1 05/15] pwrseq: implement onecell helper

[Dmitry Baryshkov]

Provide of_pwrseq_xlate_onecell() - a helper easing implementation of
power sequencers using one cell to determine pwrseq instance to return.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/power/pwrseq/core.c   | 26 ++++++++++++++++++++++++++
 include/linux/pwrseq/driver.h | 12 ++++++++++++
 2 files changed, 38 insertions(+)

diff --git a/drivers/power/pwrseq/core.c b/drivers/power/pwrseq/core.c
index 0aaba4e79a44..3dffa52f65ee 100644
--- a/drivers/power/pwrseq/core.c
+++ b/drivers/power/pwrseq/core.c
@@ -449,6 +449,32 @@ struct pwrseq_provider *__devm_of_pwrseq_provider_register(struct device *dev,
 }
 EXPORT_SYMBOL_GPL(__devm_of_pwrseq_provider_register);
 
+/**
+ * of_pwrseq_xlate_single() - returns the pwrseq instance from pwrseq provider using single index
+ * @data: the pwrseq provider data, struct pwrseq_onecell_data
+ * @args: of_phandle_args containing single integer index
+ *
+ * Intended to be used by pwrseq provider for the common case where
+ * #pwrseq-cells is 1. It will return corresponding pwrseq instance.
+ */
+struct pwrseq *of_pwrseq_xlate_onecell(void *data, struct of_phandle_args *args)
+{
+	struct pwrseq_onecell_data *pwrseq_data = data;
+	unsigned int idx;
+
+	if (args->args_count != 1)
+		return ERR_PTR(-EINVAL);
+
+	idx = args->args[0];
+	if (idx >= pwrseq_data->num) {
+		pr_err("%s: invalid index %u\n", __func__, idx);
+		return ERR_PTR(-EINVAL);
+	}
+
+	return pwrseq_data->pwrseqs[idx];
+}
+EXPORT_SYMBOL_GPL(of_pwrseq_xlate_onecell);
+
 static int __init pwrseq_core_init(void)
 {
 	return class_register(&pwrseq_class);
diff --git a/include/linux/pwrseq/driver.h b/include/linux/pwrseq/driver.h
index 0ca1d0311ab6..8d46940981bf 100644
--- a/include/linux/pwrseq/driver.h
+++ b/include/linux/pwrseq/driver.h
@@ -157,4 +157,16 @@ static inline struct pwrseq *of_pwrseq_xlate_single(void *data,
 	return data;
 }
 
+/**
+ * struct pwrseq_onecell_data - pwrseq data for of_pwrseq_xlate_onecell
+ * @num: amount of instances in @owrseqs
+ * @pwrseqs: array of pwrseq instances
+ */
+struct pwrseq_onecell_data {
+	unsigned int num;
+	struct pwrseq *pwrseqs[];
+};
+
+struct pwrseq *of_pwrseq_xlate_onecell(void *data, struct of_phandle_args *args);
+
 #endif /* __LINUX_PWRSEQ_DRIVER_H__ */
-- 
2.33.0


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[PATCH v1 06/15] pwrseq: add support for QCA BT+WiFi power sequencer

[Dmitry Baryshkov]

Add support for power sequencer used in the Qualcomm BT+WiFi SoCs. They
require several external volate regulators and some of them use separate
BT and WiFi enable GPIO pins. This code is mostly extracted from the
hci_qca.c bluetooth driver and ath10k WiFi driver. Instead of having
each of them manage pins, different requirements, regulator types, move
this knowledge to the common power sequencer driver. Currently original
drivers are not stripped from the regulator code, this will be done
later (to keep compatibility with the old device trees).

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/power/pwrseq/Kconfig      |  14 ++
 drivers/power/pwrseq/Makefile     |   1 +
 drivers/power/pwrseq/pwrseq_qca.c | 373 ++++++++++++++++++++++++++++++
 3 files changed, 388 insertions(+)
 create mode 100644 drivers/power/pwrseq/pwrseq_qca.c

diff --git a/drivers/power/pwrseq/Kconfig b/drivers/power/pwrseq/Kconfig
index 1985f13d9193..7983e37c7855 100644
--- a/drivers/power/pwrseq/Kconfig
+++ b/drivers/power/pwrseq/Kconfig
@@ -22,6 +22,20 @@ config PWRSEQ_EMMC
 	  This driver can also be built as a module. If so, the module
 	  will be called pwrseq_emmc.
 
+config PWRSEQ_QCA
+	tristate "Power Sequencer for Qualcomm WiFi + BT SoCs"
+	depends on OF
+	help
+	  If you say yes to this option, support will be included for Qualcomm
+	  WCN399x,QCA639x,QCA67xx families of hybrid WiFi and Bluetooth SoCs.
+	  Note, this driver supports only power control for these SoC, you
+	  still have to enable individual Bluetooth and WiFi drivers. This
+	  driver is only necessary on ARM platforms with these chips. PCIe
+	  cards handle power sequencing on their own.
+
+	  Say M here if you want to include support for Qualcomm WiFi+BT SoCs
+	  as a module. This will build a module called "pwrseq_qca".
+
 config PWRSEQ_SD8787
 	tristate "HW reset support for SD8787 BT + Wifi module"
 	depends on OF
diff --git a/drivers/power/pwrseq/Makefile b/drivers/power/pwrseq/Makefile
index 6f359d228843..556bf5582d47 100644
--- a/drivers/power/pwrseq/Makefile
+++ b/drivers/power/pwrseq/Makefile
@@ -6,5 +6,6 @@
 obj-$(CONFIG_PWRSEQ) += core.o
 
 obj-$(CONFIG_PWRSEQ_EMMC)	+= pwrseq_emmc.o
+obj-$(CONFIG_PWRSEQ_QCA)	+= pwrseq_qca.o
 obj-$(CONFIG_PWRSEQ_SD8787)	+= pwrseq_sd8787.o
 obj-$(CONFIG_PWRSEQ_SIMPLE)	+= pwrseq_simple.o
diff --git a/drivers/power/pwrseq/pwrseq_qca.c b/drivers/power/pwrseq/pwrseq_qca.c
new file mode 100644
index 000000000000..c15508cc80d2
--- /dev/null
+++ b/drivers/power/pwrseq/pwrseq_qca.c
@@ -0,0 +1,373 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021, Linaro Ltd.
+ *
+ * Author: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
+ *
+ * Power Sequencer for Qualcomm WiFi + BT SoCs
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/mod_devicetable.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/pwrseq/driver.h>
+#include <linux/regulator/consumer.h>
+
+/* susclk rate */
+#define SUSCLK_RATE_32KHZ	32768
+
+/*
+ * Voltage regulator information required for configuring the
+ * QCA WiFi+Bluetooth chipset
+ */
+struct qca_vreg {
+	const char *name;
+	unsigned int load_uA;
+};
+
+struct qca_device_data {
+	bool has_enable_gpios;
+
+	/*
+	 * VDDIO has to be enabled before the rest of regulators, so we treat
+	 * it separately
+	 */
+	struct qca_vreg vddio;
+
+	size_t num_vregs;
+	struct qca_vreg vregs[];
+};
+
+struct pwrseq_qca_common {
+	struct gpio_desc *sw_ctrl;
+	struct clk *susclk;
+
+	/*
+	 * Again vddio is separate so that it can be enabled before enabling
+	 * other regulators.
+	 */
+	struct regulator *vddio;
+	int num_vregs;
+	struct regulator_bulk_data vregs[];
+};
+
+struct pwrseq_qca_one {
+	struct pwrseq_qca_common *common;
+	struct gpio_desc *enable;
+};
+
+#define PWRSEQ_QCA_WIFI 0
+#define PWRSEQ_QCA_BT 1
+
+#define PWRSEQ_QCA_MAX 2
+
+struct pwrseq_qca {
+	struct pwrseq_qca_one pwrseq_qcas[PWRSEQ_QCA_MAX];
+	struct pwrseq_qca_common common;
+};
+
+static int pwrseq_qca_pre_power_on(struct pwrseq *pwrseq)
+{
+	struct pwrseq_qca_one *qca_one = pwrseq_get_drvdata(pwrseq);
+
+	if (qca_one->enable) {
+		gpiod_set_value_cansleep(qca_one->enable, 0);
+		msleep(50);
+	}
+
+	return 0;
+}
+
+static int pwrseq_qca_power_on(struct pwrseq *pwrseq)
+{
+	struct pwrseq_qca_one *qca_one = pwrseq_get_drvdata(pwrseq);
+	int ret;
+
+	if (qca_one->common->vddio) {
+		ret = regulator_enable(qca_one->common->vddio);
+		if (ret)
+			return ret;
+	}
+
+	ret = regulator_bulk_enable(qca_one->common->num_vregs, qca_one->common->vregs);
+	if (ret)
+		goto err_bulk;
+
+	ret = clk_prepare_enable(qca_one->common->susclk);
+	if (ret)
+		goto err_clk;
+
+	if (qca_one->enable) {
+		gpiod_set_value_cansleep(qca_one->enable, 1);
+		msleep(150);
+	}
+
+	if (qca_one->common->sw_ctrl) {
+		bool sw_ctrl_state = gpiod_get_value_cansleep(qca_one->common->sw_ctrl);
+		dev_dbg(&pwrseq->dev, "SW_CTRL is %d", sw_ctrl_state);
+	}
+
+	return 0;
+
+err_clk:
+	regulator_bulk_disable(qca_one->common->num_vregs, qca_one->common->vregs);
+err_bulk:
+	regulator_disable(qca_one->common->vddio);
+
+	return ret;
+}
+
+static void pwrseq_qca_power_off(struct pwrseq *pwrseq)
+{
+	struct pwrseq_qca_one *qca_one = pwrseq_get_drvdata(pwrseq);
+
+	if (qca_one->enable) {
+		gpiod_set_value_cansleep(qca_one->enable, 0);
+		msleep(50);
+	}
+
+	clk_disable_unprepare(qca_one->common->susclk);
+
+	regulator_bulk_disable(qca_one->common->num_vregs, qca_one->common->vregs);
+	regulator_disable(qca_one->common->vddio);
+
+	if (qca_one->common->sw_ctrl) {
+		bool sw_ctrl_state = gpiod_get_value_cansleep(qca_one->common->sw_ctrl);
+		dev_dbg(&pwrseq->dev, "SW_CTRL is %d", sw_ctrl_state);
+	}
+}
+
+static const struct pwrseq_ops pwrseq_qca_ops = {
+	.pre_power_on = pwrseq_qca_pre_power_on,
+	.power_on = pwrseq_qca_power_on,
+	.power_off = pwrseq_qca_power_off,
+};
+
+static int pwrseq_qca_common_init(struct device *dev, struct pwrseq_qca_common *qca_common,
+		const struct qca_device_data *data)
+{
+	int ret, i;
+
+	if (data->vddio.name) {
+		qca_common->vddio = devm_regulator_get(dev, data->vddio.name);
+		if (IS_ERR(qca_common->vddio))
+			return PTR_ERR(qca_common->vddio);
+
+		ret = regulator_set_load(qca_common->vddio, data->vddio.load_uA);
+		if (ret)
+			return ret;
+	}
+
+	qca_common->num_vregs = data->num_vregs;
+
+	for (i = 0; i < qca_common->num_vregs; i++)
+		qca_common->vregs[i].supply = data->vregs[i].name;
+
+	ret = devm_regulator_bulk_get(dev, qca_common->num_vregs, qca_common->vregs);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < qca_common->num_vregs; i++) {
+		if (!data->vregs[i].load_uA)
+			continue;
+
+		ret = regulator_set_load(qca_common->vregs[i].consumer, data->vregs[i].load_uA);
+		if (ret)
+			return ret;
+	}
+
+	qca_common->susclk = devm_clk_get_optional(dev, NULL);
+	if (IS_ERR(qca_common->susclk)) {
+		dev_err(dev, "failed to acquire clk\n");
+		return PTR_ERR(qca_common->susclk);
+	}
+
+	qca_common->sw_ctrl = devm_gpiod_get_optional(dev, "swctrl", GPIOD_IN);
+	if (IS_ERR(qca_common->sw_ctrl)) {
+		return dev_err_probe(dev, PTR_ERR(qca_common->sw_ctrl),
+				"failed to acquire SW_CTRL gpio\n");
+	} else if (!qca_common->sw_ctrl)
+		dev_info(dev, "No SW_CTRL gpio\n");
+
+	return 0;
+}
+
+static void pwrseq_qca_unprepare_susclk(void *data)
+{
+	struct pwrseq_qca_common *qca_common = data;
+
+	clk_disable_unprepare(qca_common->susclk);
+}
+
+static const struct qca_device_data qca_soc_data_default = {
+	.num_vregs = 0,
+	.has_enable_gpios = true,
+};
+
+static int pwrseq_qca_probe(struct platform_device *pdev)
+{
+	struct pwrseq_qca *pwrseq_qca;
+	struct pwrseq *pwrseq;
+	struct pwrseq_provider *provider;
+	struct device *dev = &pdev->dev;
+	struct pwrseq_onecell_data *onecell;
+	const struct qca_device_data *data;
+	int ret, i;
+
+	data = device_get_match_data(dev);
+	if (!data)
+		data = &qca_soc_data_default;
+
+	pwrseq_qca = devm_kzalloc(dev, struct_size(pwrseq_qca, common.vregs, data->num_vregs), GFP_KERNEL);
+	if (!pwrseq_qca)
+		return -ENOMEM;
+
+	onecell = devm_kzalloc(dev, struct_size(onecell, pwrseqs, PWRSEQ_QCA_MAX), GFP_KERNEL);
+	if (!onecell)
+		return -ENOMEM;
+
+	ret = pwrseq_qca_common_init(dev, &pwrseq_qca->common, data);
+	if (ret)
+		return ret;
+
+	if (data->has_enable_gpios) {
+		struct gpio_desc *gpiod;
+
+		gpiod = devm_gpiod_get_optional(dev, "wifi-enable", GPIOD_OUT_LOW);
+		if (IS_ERR(gpiod))
+			return dev_err_probe(dev, PTR_ERR(gpiod), "failed to acquire WIFI enable GPIO\n");
+		else if (!gpiod)
+			dev_warn(dev, "No WiFi enable GPIO declared\n");
+
+		pwrseq_qca->pwrseq_qcas[PWRSEQ_QCA_WIFI].enable = gpiod;
+
+		gpiod = devm_gpiod_get_optional(dev, "bt-enable", GPIOD_OUT_LOW);
+		if (IS_ERR(gpiod))
+			return dev_err_probe(dev, PTR_ERR(gpiod), "failed to acquire BT enable GPIO\n");
+		else if (!gpiod)
+			dev_warn(dev, "No BT enable GPIO declared\n");
+
+		pwrseq_qca->pwrseq_qcas[PWRSEQ_QCA_BT].enable = gpiod;
+	}
+
+	/* If we have no control over device's enablement, make sure that sleep clock is always running */
+	if (!pwrseq_qca->common.vddio ||
+	    !pwrseq_qca->common.num_vregs ||
+	    !(pwrseq_qca->pwrseq_qcas[PWRSEQ_QCA_BT].enable &&
+	      pwrseq_qca->pwrseq_qcas[PWRSEQ_QCA_WIFI].enable)) {
+		ret = clk_set_rate(pwrseq_qca->common.susclk, SUSCLK_RATE_32KHZ);
+		if (ret)
+			return ret;
+
+		ret = clk_prepare_enable(pwrseq_qca->common.susclk);
+		if (ret)
+			return ret;
+
+		ret = devm_add_action_or_reset(dev, pwrseq_qca_unprepare_susclk, &pwrseq_qca->common);
+		if (ret)
+			return ret;
+	}
+
+	for (i = 0; i < PWRSEQ_QCA_MAX; i++) {
+		pwrseq_qca->pwrseq_qcas[i].common = &pwrseq_qca->common;
+
+		pwrseq = devm_pwrseq_create(dev, &pwrseq_qca_ops);
+		if (IS_ERR(pwrseq))
+			return PTR_ERR(pwrseq);
+
+		pwrseq_set_drvdata(pwrseq, &pwrseq_qca->pwrseq_qcas[i]);
+
+		onecell->pwrseqs[i] = pwrseq;
+	}
+
+	onecell->num = PWRSEQ_QCA_MAX;
+
+	provider = devm_of_pwrseq_provider_register(dev, of_pwrseq_xlate_onecell, onecell);
+
+	return PTR_ERR_OR_ZERO(provider);
+}
+
+static const struct qca_device_data qca_soc_data_qca6390 = {
+	.vddio = { "vddio", 20000 },
+	.vregs = {
+		/* 2.0 V */
+		{ "vddpcie2", 15000 },
+		{ "vddrfa3", 400000 },
+
+		/* 0.95 V */
+		{ "vddaon", 100000 },
+		{ "vddpmu", 1250000 },
+		{ "vddrfa1", 200000 },
+
+		/* 1.35 V */
+		{ "vddrfa2", 400000 },
+		{ "vddpcie1", 35000 },
+	},
+	.num_vregs = 7,
+	.has_enable_gpios = true,
+};
+
+/* Shared between wcn3990 and wcn3991 */
+static const struct qca_device_data qca_soc_data_wcn3990 = {
+	.vddio = { "vddio", 15000 },
+	.vregs = {
+		{ "vddxo", 80000  },
+		{ "vddrf", 300000 },
+		{ "vddch0", 450000 },
+		{ "vddch1", 450000 },
+	},
+	.num_vregs = 4,
+};
+
+static const struct qca_device_data qca_soc_data_wcn3998 = {
+	.vddio = { "vddio", 10000 },
+	.vregs = {
+		{ "vddxo", 80000  },
+		{ "vddrf", 300000 },
+		{ "vddch0", 450000 },
+		{ "vddch1", 450000 },
+	},
+	.num_vregs = 4,
+};
+
+static const struct qca_device_data qca_soc_data_wcn6750 = {
+	.vddio = { "vddio", 5000 },
+	.vregs = {
+		{ "vddaon", 26000 },
+		{ "vddbtcxmx", 126000 },
+		{ "vddrfacmn", 12500 },
+		{ "vddrfa0p8", 102000 },
+		{ "vddrfa1p7", 302000 },
+		{ "vddrfa1p2", 257000 },
+		{ "vddrfa2p2", 1700000 },
+		{ "vddasd", 200 },
+	},
+	.num_vregs = 8,
+	.has_enable_gpios = true,
+};
+
+static const struct of_device_id pwrseq_qca_of_match[] = {
+	{ .compatible = "qcom,qca6174-pwrseq", },
+	{ .compatible = "qcom,qca6390-pwrseq", .data = &qca_soc_data_qca6390 },
+	{ .compatible = "qcom,qca9377-pwrseq" },
+	{ .compatible = "qcom,wcn3990-pwrseq", .data = &qca_soc_data_wcn3990 },
+	{ .compatible = "qcom,wcn3991-pwrseq", .data = &qca_soc_data_wcn3990 },
+	{ .compatible = "qcom,wcn3998-pwrseq", .data = &qca_soc_data_wcn3998 },
+	{ .compatible = "qcom,wcn6750-pwrseq", .data = &qca_soc_data_wcn6750 },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, pwrseq_qca_of_match);
+
+static struct platform_driver pwrseq_qca_driver = {
+	.probe = pwrseq_qca_probe,
+	.driver = {
+		.name = "pwrseq_qca",
+		.of_match_table = pwrseq_qca_of_match,
+	},
+};
+
+module_platform_driver(pwrseq_qca_driver);
+MODULE_LICENSE("GPL v2");
-- 
2.33.0


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[PATCH v1 07/15] pwrseq: add fallback support

[Dmitry Baryshkov]

Power sequencer support requires changing device tree. To ease migration
to pwrseq, add support for pwrseq 'fallback': let the power sequencer
driver register special handler that if matched will create pwrseq
instance basing on the consumer device tree data.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/power/pwrseq/Makefile   |  2 +-
 drivers/power/pwrseq/core.c     |  3 ++
 drivers/power/pwrseq/fallback.c | 88 +++++++++++++++++++++++++++++++++
 include/linux/pwrseq/fallback.h | 60 ++++++++++++++++++++++
 4 files changed, 152 insertions(+), 1 deletion(-)
 create mode 100644 drivers/power/pwrseq/fallback.c
 create mode 100644 include/linux/pwrseq/fallback.h

diff --git a/drivers/power/pwrseq/Makefile b/drivers/power/pwrseq/Makefile
index 556bf5582d47..949ec848cf00 100644
--- a/drivers/power/pwrseq/Makefile
+++ b/drivers/power/pwrseq/Makefile
@@ -3,7 +3,7 @@
 # Makefile for power sequencer drivers.
 #
 
-obj-$(CONFIG_PWRSEQ) += core.o
+obj-$(CONFIG_PWRSEQ) += core.o fallback.o
 
 obj-$(CONFIG_PWRSEQ_EMMC)	+= pwrseq_emmc.o
 obj-$(CONFIG_PWRSEQ_QCA)	+= pwrseq_qca.o
diff --git a/drivers/power/pwrseq/core.c b/drivers/power/pwrseq/core.c
index 3dffa52f65ee..30380ca6159a 100644
--- a/drivers/power/pwrseq/core.c
+++ b/drivers/power/pwrseq/core.c
@@ -14,6 +14,7 @@
 #include <linux/of.h>
 #include <linux/pwrseq/consumer.h>
 #include <linux/pwrseq/driver.h>
+#include <linux/pwrseq/fallback.h>
 #include <linux/slab.h>
 
 #define	to_pwrseq(a)	(container_of((a), struct pwrseq, dev))
@@ -120,6 +121,8 @@ struct pwrseq * pwrseq_get(struct device *dev, const char *id)
 	struct pwrseq *pwrseq;
 
 	pwrseq = _of_pwrseq_get(dev, id);
+	if (pwrseq == NULL)
+		pwrseq = pwrseq_fallback_get(dev, id);
 	if (IS_ERR_OR_NULL(pwrseq))
 		return pwrseq;
 
diff --git a/drivers/power/pwrseq/fallback.c b/drivers/power/pwrseq/fallback.c
new file mode 100644
index 000000000000..b83bd5795ccb
--- /dev/null
+++ b/drivers/power/pwrseq/fallback.c
@@ -0,0 +1,88 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2021 (c) Linaro Ltd.
+ * Author: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
+ */
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of_device.h>
+#include <linux/pwrseq/fallback.h>
+#include <linux/slab.h>
+
+static DEFINE_MUTEX(pwrseq_fallback_mutex);
+static LIST_HEAD(pwrseq_fallback_list);
+
+/**
+ * __pwrseq_fallback_register - internal helper for pwrseq_fallback_register
+ * @fallback - struct pwrseq_fallback to be registered
+ * @owner: module containing fallback callback
+ *
+ * Internal helper for pwrseq_fallback_register. It should not be called directly.
+ */
+int __pwrseq_fallback_register(struct pwrseq_fallback *fallback, struct module *owner)
+{
+	if (!try_module_get(owner))
+		return -EPROBE_DEFER;
+
+	fallback->owner = owner;
+
+	mutex_lock(&pwrseq_fallback_mutex);
+	list_add_tail(&fallback->list, &pwrseq_fallback_list);
+	mutex_unlock(&pwrseq_fallback_mutex);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(__pwrseq_fallback_register);
+
+/**
+ * pwrseq_fallback_unregister() - unregister fallback helper
+ * @fallback - struct pwrseq_fallback to unregister
+ *
+ * Unregister pwrseq fallback handler registered by pwrseq_fallback_handler.
+ */
+void pwrseq_fallback_unregister(struct pwrseq_fallback *fallback)
+{
+	mutex_lock(&pwrseq_fallback_mutex);
+	list_del(&fallback->list);
+	mutex_unlock(&pwrseq_fallback_mutex);
+
+	module_put(fallback->owner);
+
+	kfree(fallback);
+}
+EXPORT_SYMBOL_GPL(pwrseq_fallback_unregister);
+
+static bool pwrseq_fallback_match(struct device *dev, struct pwrseq_fallback *fallback)
+{
+	if (of_match_device(fallback->of_match_table, dev) != NULL)
+		return true;
+
+	/* We might add support for other matching options later */
+
+	return false;
+}
+
+struct pwrseq *pwrseq_fallback_get(struct device *dev, const char *id)
+{
+	struct pwrseq_fallback *fallback;
+	struct pwrseq *pwrseq = ERR_PTR(-ENODEV);
+
+	mutex_lock(&pwrseq_fallback_mutex);
+
+	list_for_each_entry(fallback, &pwrseq_fallback_list, list) {
+		if (!pwrseq_fallback_match(dev, fallback))
+			continue;
+
+		pwrseq = fallback->get(dev, id);
+		break;
+	}
+
+	mutex_unlock(&pwrseq_fallback_mutex);
+
+	if (!IS_ERR_OR_NULL(pwrseq))
+		dev_warn(dev, "legacy pwrseq support used for the device\n");
+
+	return pwrseq;
+}
diff --git a/include/linux/pwrseq/fallback.h b/include/linux/pwrseq/fallback.h
new file mode 100644
index 000000000000..14f9aa527692
--- /dev/null
+++ b/include/linux/pwrseq/fallback.h
@@ -0,0 +1,60 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (c) 2021 Linaro Ltd.
+ */
+
+#ifndef __LINUX_PWRSEQ_FALLBACK_H__
+#define __LINUX_PWRSEQ_FALLBACK_H__
+
+#include <linux/list.h>
+
+struct pwrseq;
+
+struct device;
+struct module;
+struct of_device_id;
+
+/**
+ * struct pwrseq_fallback - structure providing fallback data/
+ * @list: a list node for the fallback handlers
+ * @owner: module containing fallback callback
+ * @of_match_table: match table for this fallback
+ *
+ * Pwrseq fallback is a mechanism for handling backwards compatibility in the
+ * case device tree was not updated to use proper pwrseq providers.
+ *
+ * In case the pwrseq instance is not registered, core will automatically try
+ * locating and calling fallback getter. If the requesting device matches
+ * against @of_match_table, the @get callback will be called to retrieve pwrseq
+ * instance.
+ *
+ * The driver should fill of_match_table and @get fields only. @list and @owner
+ * will be filled by the core code.
+ */
+struct pwrseq_fallback {
+	struct list_head list;
+	struct module *owner;
+
+	const struct of_device_id *of_match_table;
+
+	struct pwrseq *(*get)(struct device *dev, const char *id);
+};
+
+/* provider interface */
+
+int __pwrseq_fallback_register(struct pwrseq_fallback *fallback, struct module *owner);
+
+/**
+ * pwrseq_fallback_register() - register fallback helper
+ * @fallback - struct pwrseq_fallback to be registered
+ *
+ * Register pwrseq fallback handler to assist pwrseq core.
+ */
+#define pwrseq_fallback_register(fallback) __pwrseq_fallback_register(fallback, THIS_MODULE)
+
+void pwrseq_fallback_unregister(struct pwrseq_fallback *fallback);
+
+/* internal interface to be used by pwrseq core */
+struct pwrseq *pwrseq_fallback_get(struct device *dev, const char *id);
+
+#endif /* __LINUX_PWRSEQ_DRIVER_H__ */
-- 
2.33.0


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[PATCH v1 08/15] pwrseq: pwrseq_qca: implement fallback support

[Dmitry Baryshkov]

While we are waiting for all users of wcn399x-bt to be converted to the
pwrseq declaration in the device tree, provide support for the pwrseq
fallback: if the regulators are declared in the device itself, create
pwrseq instance. This way the hci_qca driver doesn't have to cope with
old and new dts bindings.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/power/pwrseq/pwrseq_qca.c | 155 +++++++++++++++++++++++++++++-
 1 file changed, 154 insertions(+), 1 deletion(-)

diff --git a/drivers/power/pwrseq/pwrseq_qca.c b/drivers/power/pwrseq/pwrseq_qca.c
index c15508cc80d2..f237cf2f1880 100644
--- a/drivers/power/pwrseq/pwrseq_qca.c
+++ b/drivers/power/pwrseq/pwrseq_qca.c
@@ -11,9 +11,11 @@
 #include <linux/delay.h>
 #include <linux/gpio/consumer.h>
 #include <linux/mod_devicetable.h>
+#include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/property.h>
 #include <linux/pwrseq/driver.h>
+#include <linux/pwrseq/fallback.h>
 #include <linux/regulator/consumer.h>
 
 /* susclk rate */
@@ -369,5 +371,156 @@ static struct platform_driver pwrseq_qca_driver = {
 	},
 };
 
-module_platform_driver(pwrseq_qca_driver);
+struct pwrseq_qca_fallback {
+	struct pwrseq_qca_one qca_one;
+	struct pwrseq_qca_common common;
+};
+
+static const struct of_device_id pwrseq_qca_bt_of_match[] = {
+	{ .compatible = "qcom,qca6174-bt" },
+	{ .compatible = "qcom,qca6390-bt", .data = &qca_soc_data_qca6390},
+	{ .compatible = "qcom,qca9377-bt" },
+	{ .compatible = "qcom,wcn3990-bt", .data = &qca_soc_data_wcn3990 },
+	{ .compatible = "qcom,wcn3991-bt", .data = &qca_soc_data_wcn3990 },
+	{ .compatible = "qcom,wcn3998-bt", .data = &qca_soc_data_wcn3998 },
+	{ .compatible = "qcom,wcn6750-bt", .data = &qca_soc_data_wcn6750 },
+	{ /* sentinel */ },
+};
+
+static const struct qca_device_data qca_soc_data_wifi = {
+	.vregs = {
+		{ "vdd-1.8-xo", 80000  },
+		{ "vdd-1.3-rfa", 300000 },
+		{ "vdd-3.3-ch0", 450000 },
+		{ "vdd-3.3-ch1", 450000 },
+	},
+	.num_vregs = 4,
+};
+
+static const struct of_device_id pwrseq_qca_wifi_of_match[] = {
+	{ .compatible = "qcom,wcn3990-wifi", .data = &qca_soc_data_wifi },
+	{ /* sentinel */ }
+};
+
+static struct pwrseq * pwrseq_qca_fallback_get(struct device *dev)
+{
+	struct pwrseq_qca_fallback *fallback;
+	struct pwrseq *pwrseq;
+	const struct of_device_id *match;
+	const struct qca_device_data *data;
+	struct gpio_desc *gpiod;
+	int ret;
+
+	match = of_match_device(pwrseq_qca_bt_of_match, dev);
+	if (!match)
+		return ERR_PTR(-ENODEV);
+
+	data = match->data;
+	if (!data)
+		data = &qca_soc_data_default;
+
+	fallback = devm_kzalloc(dev, struct_size(fallback, common.vregs, data->num_vregs), GFP_KERNEL);
+	if (!data)
+		return ERR_PTR(-ENOMEM);
+
+	fallback->qca_one.common = &fallback->common;
+
+	ret = pwrseq_qca_common_init(dev, &fallback->common, data);
+	if (ret)
+		return ERR_PTR(ret);
+
+	if (data->has_enable_gpios) {
+		gpiod = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
+		if (IS_ERR(gpiod))
+			return ERR_PTR(dev_err_probe(dev, PTR_ERR(gpiod), "failed to acquire enable GPIO\n"));
+		fallback->qca_one.enable = gpiod;
+	}
+
+	/* If we have no control over device's enablement, make sure that sleep clock is always running */
+	if (!fallback->common.vddio ||
+	    !fallback->common.num_vregs ||
+	    !fallback->qca_one.enable) {
+		ret = clk_set_rate(fallback->common.susclk, SUSCLK_RATE_32KHZ);
+		if (ret)
+			return ERR_PTR(ret);
+
+		ret = clk_prepare_enable(fallback->common.susclk);
+		if (ret)
+			return ERR_PTR(ret);
+
+		ret = devm_add_action_or_reset(dev, pwrseq_qca_unprepare_susclk, &fallback->common);
+		if (ret)
+			return ERR_PTR(ret);
+	}
+
+	pwrseq = devm_pwrseq_create(dev, &pwrseq_qca_ops);
+	if (IS_ERR(pwrseq))
+		return pwrseq;
+
+	pwrseq_set_drvdata(pwrseq, &fallback->qca_one);
+
+	return pwrseq;
+}
+
+static struct pwrseq * pwrseq_qca_fallback_get_bt(struct device *dev, const char *id)
+{
+	if (strcmp(id, "bt"))
+		return ERR_PTR(-ENODEV);
+
+	return pwrseq_qca_fallback_get(dev);
+}
+
+static struct pwrseq * pwrseq_qca_fallback_get_wifi(struct device *dev, const char *id)
+{
+	if (strcmp(id, "wifi"))
+		return ERR_PTR(-ENODEV);
+
+	return pwrseq_qca_fallback_get(dev);
+}
+
+static struct pwrseq_fallback pwrseq_qca_fallback_bt = {
+	.get = pwrseq_qca_fallback_get_bt,
+	.of_match_table = pwrseq_qca_bt_of_match,
+};
+
+static struct pwrseq_fallback pwrseq_qca_fallback_wifi = {
+	.get = pwrseq_qca_fallback_get_wifi,
+	.of_match_table = pwrseq_qca_wifi_of_match,
+};
+
+static int __init pwrseq_qca_init(void)
+{
+	int ret;
+
+	ret = platform_driver_register(&pwrseq_qca_driver);
+	if (ret)
+		return ret;
+
+	ret = pwrseq_fallback_register(&pwrseq_qca_fallback_bt);
+	if (ret)
+		goto err_bt;
+
+	ret = pwrseq_fallback_register(&pwrseq_qca_fallback_wifi);
+	if (ret)
+		goto err_wifi;
+
+	return 0;
+
+err_wifi:
+	pwrseq_fallback_unregister(&pwrseq_qca_fallback_bt);
+err_bt:
+	platform_driver_unregister(&pwrseq_qca_driver);
+
+	return ret;
+}
+module_init(pwrseq_qca_init);
+
+static void __exit pwrseq_qca_exit(void)
+{
+	pwrseq_fallback_unregister(&pwrseq_qca_fallback_wifi);
+	pwrseq_fallback_unregister(&pwrseq_qca_fallback_bt);
+	platform_driver_unregister(&pwrseq_qca_driver);
+}
+module_exit(pwrseq_qca_exit);
+
 MODULE_LICENSE("GPL v2");
-- 
2.33.0


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[PATCH v1 09/15] Bluetooth: hci_qca: switch to using pwrseq

[Dmitry Baryshkov]

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/bluetooth/hci_qca.c | 260 +++++-------------------------------
 1 file changed, 37 insertions(+), 223 deletions(-)

diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index 53deea2eb7b4..1e4416916533 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -16,19 +16,17 @@
  */
 
 #include <linux/kernel.h>
-#include <linux/clk.h>
 #include <linux/completion.h>
 #include <linux/debugfs.h>
 #include <linux/delay.h>
 #include <linux/devcoredump.h>
 #include <linux/device.h>
-#include <linux/gpio/consumer.h>
 #include <linux/mod_devicetable.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
 #include <linux/acpi.h>
 #include <linux/platform_device.h>
-#include <linux/regulator/consumer.h>
+#include <linux/pwrseq/consumer.h>
 #include <linux/serdev.h>
 #include <linux/mutex.h>
 #include <asm/unaligned.h>
@@ -54,9 +52,6 @@
 	(MEMDUMP_TIMEOUT_MS + FW_DOWNLOAD_TIMEOUT_MS)
 #define FW_DOWNLOAD_TIMEOUT_MS		3000
 
-/* susclk rate */
-#define SUSCLK_RATE_32KHZ	32768
-
 /* Controller debug log header */
 #define QCA_DEBUG_HANDLE	0x2EDC
 
@@ -200,28 +195,17 @@ struct qca_vreg {
 
 struct qca_device_data {
 	enum qca_btsoc_type soc_type;
-	struct qca_vreg *vregs;
-	size_t num_vregs;
 	uint32_t capabilities;
 };
 
 /*
  * Platform data for the QCA Bluetooth power driver.
  */
-struct qca_power {
-	struct device *dev;
-	struct regulator_bulk_data *vreg_bulk;
-	int num_vregs;
-	bool vregs_on;
-};
-
 struct qca_serdev {
 	struct hci_uart	 serdev_hu;
-	struct gpio_desc *bt_en;
-	struct gpio_desc *sw_ctrl;
-	struct clk	 *susclk;
 	enum qca_btsoc_type btsoc_type;
-	struct qca_power *bt_power;
+	struct pwrseq *pwrseq;
+	bool vregs_on;
 	u32 init_speed;
 	u32 oper_speed;
 	const char *firmware_name;
@@ -1596,13 +1580,12 @@ static int qca_regulator_init(struct hci_uart *hu)
 	enum qca_btsoc_type soc_type = qca_soc_type(hu);
 	struct qca_serdev *qcadev;
 	int ret;
-	bool sw_ctrl_state;
 
 	/* Check for vregs status, may be hci down has turned
 	 * off the voltage regulator.
 	 */
 	qcadev = serdev_device_get_drvdata(hu->serdev);
-	if (!qcadev->bt_power->vregs_on) {
+	if (!qcadev->vregs_on) {
 		serdev_device_close(hu->serdev);
 		ret = qca_regulator_enable(qcadev);
 		if (ret)
@@ -1623,19 +1606,9 @@ static int qca_regulator_init(struct hci_uart *hu)
 			return ret;
 	}
 
-	/* For wcn6750 need to enable gpio bt_en */
-	if (qcadev->bt_en) {
-		gpiod_set_value_cansleep(qcadev->bt_en, 0);
-		msleep(50);
-		gpiod_set_value_cansleep(qcadev->bt_en, 1);
-		msleep(50);
-		if (qcadev->sw_ctrl) {
-			sw_ctrl_state = gpiod_get_value_cansleep(qcadev->sw_ctrl);
-			bt_dev_dbg(hu->hdev, "SW_CTRL is %d", sw_ctrl_state);
-		}
-	}
-
-	qca_set_speed(hu, QCA_INIT_SPEED);
+	if (qca_is_wcn399x(soc_type) ||
+	    qca_is_wcn6750(soc_type))
+		qca_set_speed(hu, QCA_INIT_SPEED);
 
 	if (qca_is_wcn399x(soc_type)) {
 		ret = qca_send_power_pulse(hu, true);
@@ -1655,7 +1628,9 @@ static int qca_regulator_init(struct hci_uart *hu)
 		return ret;
 	}
 
-	hci_uart_set_flow_control(hu, false);
+	if (qca_is_wcn399x(soc_type) ||
+	    qca_is_wcn6750(soc_type))
+		hci_uart_set_flow_control(hu, false);
 
 	return 0;
 }
@@ -1663,8 +1638,6 @@ static int qca_regulator_init(struct hci_uart *hu)
 static int qca_power_on(struct hci_dev *hdev)
 {
 	struct hci_uart *hu = hci_get_drvdata(hdev);
-	enum qca_btsoc_type soc_type = qca_soc_type(hu);
-	struct qca_serdev *qcadev;
 	struct qca_data *qca = hu->priv;
 	int ret = 0;
 
@@ -1674,17 +1647,7 @@ static int qca_power_on(struct hci_dev *hdev)
 	if (!hu->serdev)
 		return 0;
 
-	if (qca_is_wcn399x(soc_type) ||
-	    qca_is_wcn6750(soc_type)) {
-		ret = qca_regulator_init(hu);
-	} else {
-		qcadev = serdev_device_get_drvdata(hu->serdev);
-		if (qcadev->bt_en) {
-			gpiod_set_value_cansleep(qcadev->bt_en, 1);
-			/* Controller needs time to bootup. */
-			msleep(150);
-		}
-	}
+	ret = qca_regulator_init(hu);
 
 	clear_bit(QCA_BT_OFF, &qca->flags);
 	return ret;
@@ -1820,57 +1783,23 @@ static const struct hci_uart_proto qca_proto = {
 
 static const struct qca_device_data qca_soc_data_wcn3990 = {
 	.soc_type = QCA_WCN3990,
-	.vregs = (struct qca_vreg []) {
-		{ "vddio", 15000  },
-		{ "vddxo", 80000  },
-		{ "vddrf", 300000 },
-		{ "vddch0", 450000 },
-	},
-	.num_vregs = 4,
 };
 
 static const struct qca_device_data qca_soc_data_wcn3991 = {
 	.soc_type = QCA_WCN3991,
-	.vregs = (struct qca_vreg []) {
-		{ "vddio", 15000  },
-		{ "vddxo", 80000  },
-		{ "vddrf", 300000 },
-		{ "vddch0", 450000 },
-	},
-	.num_vregs = 4,
 	.capabilities = QCA_CAP_WIDEBAND_SPEECH | QCA_CAP_VALID_LE_STATES,
 };
 
 static const struct qca_device_data qca_soc_data_wcn3998 = {
 	.soc_type = QCA_WCN3998,
-	.vregs = (struct qca_vreg []) {
-		{ "vddio", 10000  },
-		{ "vddxo", 80000  },
-		{ "vddrf", 300000 },
-		{ "vddch0", 450000 },
-	},
-	.num_vregs = 4,
 };
 
 static const struct qca_device_data qca_soc_data_qca6390 = {
 	.soc_type = QCA_QCA6390,
-	.num_vregs = 0,
 };
 
 static const struct qca_device_data qca_soc_data_wcn6750 = {
 	.soc_type = QCA_WCN6750,
-	.vregs = (struct qca_vreg []) {
-		{ "vddio", 5000 },
-		{ "vddaon", 26000 },
-		{ "vddbtcxmx", 126000 },
-		{ "vddrfacmn", 12500 },
-		{ "vddrfa0p8", 102000 },
-		{ "vddrfa1p7", 302000 },
-		{ "vddrfa1p2", 257000 },
-		{ "vddrfa2p2", 1700000 },
-		{ "vddasd", 200 },
-	},
-	.num_vregs = 9,
 	.capabilities = QCA_CAP_WIDEBAND_SPEECH | QCA_CAP_VALID_LE_STATES,
 };
 
@@ -1880,7 +1809,6 @@ static void qca_power_shutdown(struct hci_uart *hu)
 	struct qca_data *qca = hu->priv;
 	unsigned long flags;
 	enum qca_btsoc_type soc_type = qca_soc_type(hu);
-	bool sw_ctrl_state;
 
 	/* From this point we go into power off state. But serial port is
 	 * still open, stop queueing the IBS data and flush all the buffered
@@ -1902,19 +1830,10 @@ static void qca_power_shutdown(struct hci_uart *hu)
 	if (qca_is_wcn399x(soc_type)) {
 		host_set_baudrate(hu, 2400);
 		qca_send_power_pulse(hu, false);
-		qca_regulator_disable(qcadev);
-	} else if (soc_type == QCA_WCN6750) {
-		gpiod_set_value_cansleep(qcadev->bt_en, 0);
-		msleep(100);
-		qca_regulator_disable(qcadev);
-		if (qcadev->sw_ctrl) {
-			sw_ctrl_state = gpiod_get_value_cansleep(qcadev->sw_ctrl);
-			bt_dev_dbg(hu->hdev, "SW_CTRL is %d", sw_ctrl_state);
-		}
-	} else if (qcadev->bt_en) {
-		gpiod_set_value_cansleep(qcadev->bt_en, 0);
 	}
 
+	qca_regulator_disable(qcadev);
+
 	set_bit(QCA_BT_OFF, &qca->flags);
 }
 
@@ -1940,75 +1859,34 @@ static int qca_power_off(struct hci_dev *hdev)
 
 static int qca_regulator_enable(struct qca_serdev *qcadev)
 {
-	struct qca_power *power = qcadev->bt_power;
 	int ret;
 
 	/* Already enabled */
-	if (power->vregs_on)
+	if (qcadev->vregs_on)
 		return 0;
 
-	BT_DBG("enabling %d regulators)", power->num_vregs);
+	BT_DBG("enabling regulators)");
 
-	ret = regulator_bulk_enable(power->num_vregs, power->vreg_bulk);
+	ret = pwrseq_full_power_on(qcadev->pwrseq);
 	if (ret)
 		return ret;
 
-	power->vregs_on = true;
-
-	ret = clk_prepare_enable(qcadev->susclk);
-	if (ret)
-		qca_regulator_disable(qcadev);
+	qcadev->vregs_on = true;
 
 	return ret;
 }
 
 static void qca_regulator_disable(struct qca_serdev *qcadev)
 {
-	struct qca_power *power;
-
 	if (!qcadev)
 		return;
 
-	power = qcadev->bt_power;
-
 	/* Already disabled? */
-	if (!power->vregs_on)
+	if (!qcadev->vregs_on)
 		return;
 
-	regulator_bulk_disable(power->num_vregs, power->vreg_bulk);
-	power->vregs_on = false;
-
-	clk_disable_unprepare(qcadev->susclk);
-}
-
-static int qca_init_regulators(struct qca_power *qca,
-				const struct qca_vreg *vregs, size_t num_vregs)
-{
-	struct regulator_bulk_data *bulk;
-	int ret;
-	int i;
-
-	bulk = devm_kcalloc(qca->dev, num_vregs, sizeof(*bulk), GFP_KERNEL);
-	if (!bulk)
-		return -ENOMEM;
-
-	for (i = 0; i < num_vregs; i++)
-		bulk[i].supply = vregs[i].name;
-
-	ret = devm_regulator_bulk_get(qca->dev, num_vregs, bulk);
-	if (ret < 0)
-		return ret;
-
-	for (i = 0; i < num_vregs; i++) {
-		ret = regulator_set_load(bulk[i].consumer, vregs[i].load_uA);
-		if (ret)
-			return ret;
-	}
-
-	qca->vreg_bulk = bulk;
-	qca->num_vregs = num_vregs;
-
-	return 0;
+	pwrseq_power_off(qcadev->pwrseq);
+	qcadev->vregs_on = false;
 }
 
 static int qca_serdev_probe(struct serdev_device *serdev)
@@ -2017,7 +1895,6 @@ static int qca_serdev_probe(struct serdev_device *serdev)
 	struct hci_dev *hdev;
 	const struct qca_device_data *data;
 	int err;
-	bool power_ctrl_enabled = true;
 
 	qcadev = devm_kzalloc(&serdev->dev, sizeof(*qcadev), GFP_KERNEL);
 	if (!qcadev)
@@ -2033,89 +1910,29 @@ static int qca_serdev_probe(struct serdev_device *serdev)
 	if (!qcadev->oper_speed)
 		BT_DBG("UART will pick default operating speed");
 
-	if (data &&
-	    (qca_is_wcn399x(data->soc_type) ||
-	    qca_is_wcn6750(data->soc_type))) {
-		qcadev->btsoc_type = data->soc_type;
-		qcadev->bt_power = devm_kzalloc(&serdev->dev,
-						sizeof(struct qca_power),
-						GFP_KERNEL);
-		if (!qcadev->bt_power)
-			return -ENOMEM;
-
-		qcadev->bt_power->dev = &serdev->dev;
-		err = qca_init_regulators(qcadev->bt_power, data->vregs,
-					  data->num_vregs);
-		if (err) {
-			BT_ERR("Failed to init regulators:%d", err);
-			return err;
-		}
-
-		qcadev->bt_power->vregs_on = false;
-
-		qcadev->bt_en = devm_gpiod_get_optional(&serdev->dev, "enable",
-					       GPIOD_OUT_LOW);
-		if (!qcadev->bt_en && data->soc_type == QCA_WCN6750) {
-			dev_err(&serdev->dev, "failed to acquire BT_EN gpio\n");
-			power_ctrl_enabled = false;
-		}
 
-		qcadev->sw_ctrl = devm_gpiod_get_optional(&serdev->dev, "swctrl",
-					       GPIOD_IN);
-		if (!qcadev->sw_ctrl && data->soc_type == QCA_WCN6750)
-			dev_warn(&serdev->dev, "failed to acquire SW_CTRL gpio\n");
-
-		qcadev->susclk = devm_clk_get_optional(&serdev->dev, NULL);
-		if (IS_ERR(qcadev->susclk)) {
-			dev_err(&serdev->dev, "failed to acquire clk\n");
-			return PTR_ERR(qcadev->susclk);
-		}
-
-		err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
-		if (err) {
-			BT_ERR("wcn3990 serdev registration failed");
-			return err;
-		}
-	} else {
-		if (data)
-			qcadev->btsoc_type = data->soc_type;
-		else
-			qcadev->btsoc_type = QCA_ROME;
+	if (data)
+		qcadev->btsoc_type = data->soc_type;
+	else
+		qcadev->btsoc_type = QCA_ROME;
 
-		qcadev->bt_en = devm_gpiod_get_optional(&serdev->dev, "enable",
-					       GPIOD_OUT_LOW);
-		if (!qcadev->bt_en) {
-			dev_warn(&serdev->dev, "failed to acquire enable gpio\n");
-			power_ctrl_enabled = false;
-		}
+	qcadev->pwrseq = devm_pwrseq_get(&serdev->dev, "bt");
+	if (IS_ERR(qcadev->pwrseq)) {
+		dev_err(&serdev->dev, "failed to acquire pwrseq\n");
+		return PTR_ERR(qcadev->pwrseq);
+	}
+	qcadev->vregs_on = false;
 
-		qcadev->susclk = devm_clk_get_optional(&serdev->dev, NULL);
-		if (IS_ERR(qcadev->susclk)) {
-			dev_warn(&serdev->dev, "failed to acquire clk\n");
-			return PTR_ERR(qcadev->susclk);
-		}
-		err = clk_set_rate(qcadev->susclk, SUSCLK_RATE_32KHZ);
-		if (err)
-			return err;
-
-		err = clk_prepare_enable(qcadev->susclk);
-		if (err)
-			return err;
-
-		err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
-		if (err) {
-			BT_ERR("Rome serdev registration failed");
-			clk_disable_unprepare(qcadev->susclk);
-			return err;
-		}
+	err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
+	if (err) {
+		BT_ERR("wcn3990 serdev registration failed");
+		return err;
 	}
 
 	hdev = qcadev->serdev_hu.hdev;
 
-	if (power_ctrl_enabled) {
-		set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);
-		hdev->shutdown = qca_power_off;
-	}
+	set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);
+	hdev->shutdown = qca_power_off;
 
 	if (data) {
 		/* Wideband speech support must be set per driver since it can't
@@ -2135,14 +1952,11 @@ static int qca_serdev_probe(struct serdev_device *serdev)
 static void qca_serdev_remove(struct serdev_device *serdev)
 {
 	struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
-	struct qca_power *power = qcadev->bt_power;
 
 	if ((qca_is_wcn399x(qcadev->btsoc_type) ||
 	     qca_is_wcn6750(qcadev->btsoc_type)) &&
-	     power->vregs_on)
+	     qcadev->vregs_on)
 		qca_power_shutdown(&qcadev->serdev_hu);
-	else if (qcadev->susclk)
-		clk_disable_unprepare(qcadev->susclk);
 
 	hci_uart_unregister_device(&qcadev->serdev_hu);
 }
-- 
2.33.0


_______________________________________________
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ath10k@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/ath10k

[PATCH v1 10/15] ath10k: add support for pwrseq sequencing

[Dmitry Baryshkov]

Power sequencing for Qualcomm WiFi+BT chipsets are being reworked to use
pwrseq rather than individually handling all the regulators. Add support
for pwrseq to ath10k SNOC driver.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/net/wireless/ath/ath10k/snoc.c | 45 +++++++++++++-------------
 drivers/net/wireless/ath/ath10k/snoc.h |  4 +--
 2 files changed, 25 insertions(+), 24 deletions(-)

diff --git a/drivers/net/wireless/ath/ath10k/snoc.c b/drivers/net/wireless/ath/ath10k/snoc.c
index ea00fbb15601..8578c56982df 100644
--- a/drivers/net/wireless/ath/ath10k/snoc.c
+++ b/drivers/net/wireless/ath/ath10k/snoc.c
@@ -14,6 +14,7 @@
 #include <linux/regulator/consumer.h>
 #include <linux/of_address.h>
 #include <linux/iommu.h>
+#include <linux/pwrseq/consumer.h>
 
 #include "ce.h"
 #include "coredump.h"
@@ -41,14 +42,6 @@ static char *const ce_name[] = {
 	"WLAN_CE_11",
 };
 
-static const char * const ath10k_regulators[] = {
-	"vdd-0.8-cx-mx",
-	"vdd-1.8-xo",
-	"vdd-1.3-rfa",
-	"vdd-3.3-ch0",
-	"vdd-3.3-ch1",
-};
-
 static const char * const ath10k_clocks[] = {
 	"cxo_ref_clk_pin", "qdss",
 };
@@ -1010,10 +1003,14 @@ static int ath10k_hw_power_on(struct ath10k *ar)
 
 	ath10k_dbg(ar, ATH10K_DBG_SNOC, "soc power on\n");
 
-	ret = regulator_bulk_enable(ar_snoc->num_vregs, ar_snoc->vregs);
+	ret = pwrseq_full_power_on(ar_snoc->pwrseq);
 	if (ret)
 		return ret;
 
+	ret = regulator_enable(ar_snoc->vreg_cx_mx);
+	if (ret)
+		goto vreg_pwrseq_off;
+
 	ret = clk_bulk_prepare_enable(ar_snoc->num_clks, ar_snoc->clks);
 	if (ret)
 		goto vreg_off;
@@ -1021,11 +1018,14 @@ static int ath10k_hw_power_on(struct ath10k *ar)
 	return ret;
 
 vreg_off:
-	regulator_bulk_disable(ar_snoc->num_vregs, ar_snoc->vregs);
+	regulator_disable(ar_snoc->vreg_cx_mx);
+vreg_pwrseq_off:
+	pwrseq_power_off(ar_snoc->pwrseq);
+
 	return ret;
 }
 
-static int ath10k_hw_power_off(struct ath10k *ar)
+static void ath10k_hw_power_off(struct ath10k *ar)
 {
 	struct ath10k_snoc *ar_snoc = ath10k_snoc_priv(ar);
 
@@ -1033,7 +1033,9 @@ static int ath10k_hw_power_off(struct ath10k *ar)
 
 	clk_bulk_disable_unprepare(ar_snoc->num_clks, ar_snoc->clks);
 
-	return regulator_bulk_disable(ar_snoc->num_vregs, ar_snoc->vregs);
+	regulator_disable(ar_snoc->vreg_cx_mx);
+
+	pwrseq_power_off(ar_snoc->pwrseq);
 }
 
 static void ath10k_snoc_wlan_disable(struct ath10k *ar)
@@ -1691,20 +1693,19 @@ static int ath10k_snoc_probe(struct platform_device *pdev)
 		goto err_release_resource;
 	}
 
-	ar_snoc->num_vregs = ARRAY_SIZE(ath10k_regulators);
-	ar_snoc->vregs = devm_kcalloc(&pdev->dev, ar_snoc->num_vregs,
-				      sizeof(*ar_snoc->vregs), GFP_KERNEL);
-	if (!ar_snoc->vregs) {
-		ret = -ENOMEM;
+	ar_snoc->pwrseq = devm_pwrseq_get(&pdev->dev, "wifi");
+	if (IS_ERR(ar_snoc->pwrseq)) {
+		ret = PTR_ERR(ar_snoc->pwrseq);
+		if (ret != -EPROBE_DEFER)
+			ath10k_warn(ar, "failed to acquire pwrseq: %d\n", ret);
 		goto err_free_irq;
 	}
-	for (i = 0; i < ar_snoc->num_vregs; i++)
-		ar_snoc->vregs[i].supply = ath10k_regulators[i];
 
-	ret = devm_regulator_bulk_get(&pdev->dev, ar_snoc->num_vregs,
-				      ar_snoc->vregs);
-	if (ret < 0)
+	ar_snoc->vreg_cx_mx = devm_regulator_get(&pdev->dev, "vdd-0.8-cx-mx");
+	if (IS_ERR(ar_snoc->vreg_cx_mx)) {
+		ret = PTR_ERR(ar_snoc->vreg_cx_mx);
 		goto err_free_irq;
+	}
 
 	ar_snoc->num_clks = ARRAY_SIZE(ath10k_clocks);
 	ar_snoc->clks = devm_kcalloc(&pdev->dev, ar_snoc->num_clks,
diff --git a/drivers/net/wireless/ath/ath10k/snoc.h b/drivers/net/wireless/ath/ath10k/snoc.h
index 5095d1893681..5188d6f6f850 100644
--- a/drivers/net/wireless/ath/ath10k/snoc.h
+++ b/drivers/net/wireless/ath/ath10k/snoc.h
@@ -70,10 +70,10 @@ struct ath10k_snoc {
 	struct ath10k_snoc_ce_irq ce_irqs[CE_COUNT_MAX];
 	struct ath10k_ce ce;
 	struct timer_list rx_post_retry;
-	struct regulator_bulk_data *vregs;
-	size_t num_vregs;
+	struct regulator *vreg_cx_mx;
 	struct clk_bulk_data *clks;
 	size_t num_clks;
+	struct pwrseq *pwrseq;
 	struct ath10k_qmi *qmi;
 	unsigned long flags;
 	bool xo_cal_supported;
-- 
2.33.0


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Re: [PATCH v1 10/15] ath10k: add support for pwrseq sequencing

[Kalle Valo]

Dmitry Baryshkov <dmitry.baryshkov@linaro.org> writes:

> Power sequencing for Qualcomm WiFi+BT chipsets are being reworked to use
> pwrseq rather than individually handling all the regulators. Add support
> for pwrseq to ath10k SNOC driver.
>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

Please include a Tested-on tag so that it's documented on what hardware
and firmware combination you tested this:

https://wireless.wiki.kernel.org/en/users/drivers/ath10k/submittingpatches#tested-on_tag

Otherwise looks ok to me. I assume this is going via some another tree
than my ath tree:

Acked-by: Kalle Valo <kvalo@codeaurora.org>

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[PATCH v1 11/15] arm64: dts: qcom: sdm845-db845c: switch bt+wifi to qca power sequencer

[Dmitry Baryshkov]

Switch sdm845-db845c device tree to use new power sequencer driver
rather than separate regulators.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 arch/arm64/boot/dts/qcom/sdm845-db845c.dts | 21 ++++++++++++++-------
 arch/arm64/boot/dts/qcom/sdm845.dtsi       |  6 ++++++
 2 files changed, 20 insertions(+), 7 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/sdm845-db845c.dts b/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
index 2d5533dd4ec2..a6a34a959a91 100644
--- a/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
+++ b/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
@@ -629,6 +629,16 @@ &qupv3_id_1 {
 	status = "okay";
 };
 
+&qca_pwrseq {
+	status = "okay";
+
+	vddio-supply = <&vreg_s4a_1p8>;
+
+	vddxo-supply = <&vreg_l7a_1p8>;
+	vddrf-supply = <&vreg_l17a_1p3>;
+	vddch0-supply = <&vreg_l25a_3p3>;
+};
+
 &sdhc_2 {
 	status = "okay";
 
@@ -916,10 +926,8 @@ &uart6 {
 	bluetooth {
 		compatible = "qcom,wcn3990-bt";
 
-		vddio-supply = <&vreg_s4a_1p8>;
-		vddxo-supply = <&vreg_l7a_1p8>;
-		vddrf-supply = <&vreg_l17a_1p3>;
-		vddch0-supply = <&vreg_l25a_3p3>;
+		bt-pwrseq = <&qca_pwrseq 1>;
+
 		max-speed = <3200000>;
 	};
 };
@@ -1036,9 +1044,8 @@ &wifi {
 	status = "okay";
 
 	vdd-0.8-cx-mx-supply = <&vreg_l5a_0p8>;
-	vdd-1.8-xo-supply = <&vreg_l7a_1p8>;
-	vdd-1.3-rfa-supply = <&vreg_l17a_1p3>;
-	vdd-3.3-ch0-supply = <&vreg_l25a_3p3>;
+
+	wifi-pwrseq = <&qca_pwrseq 0>;
 
 	qcom,snoc-host-cap-8bit-quirk;
 };
diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
index 6d7172e6f4c3..99117eaf617f 100644
--- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
+++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
@@ -1046,6 +1046,12 @@ psci {
 		method = "smc";
 	};
 
+	qca_pwrseq: qca-pwrseq {
+		compatible = "qcom,wcn3990-pwrseq";
+		#pwrseq-cells = <1>;
+		status = "disabled";
+	};
+
 	soc: soc@0 {
 		#address-cells = <2>;
 		#size-cells = <2>;
-- 
2.33.0


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[PATCH v1 12/15] arm64: dts: qcom: qrb5165-rb5: add bluetooth support

[Dmitry Baryshkov]

Add support for the bluetooth part of the QCA6391 BT+WiFi chip present
on the RB5 board. WiFi is not supported yet, as it requires separate
handling of the PCIe device power.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 arch/arm64/boot/dts/qcom/qrb5165-rb5.dts | 50 ++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/qrb5165-rb5.dts b/arch/arm64/boot/dts/qcom/qrb5165-rb5.dts
index 8ac96f8e79d4..326330f528fc 100644
--- a/arch/arm64/boot/dts/qcom/qrb5165-rb5.dts
+++ b/arch/arm64/boot/dts/qcom/qrb5165-rb5.dts
@@ -19,6 +19,7 @@ / {
 
 	aliases {
 		serial0 = &uart12;
+		serial1 = &uart6;
 		sdhc2 = &sdhc_2;
 	};
 
@@ -98,6 +99,25 @@ lt9611_3v3: lt9611-3v3 {
 		regulator-always-on;
 	};
 
+	qca_pwrseq: qca-pwrseq {
+		compatible = "qcom,qca6390-pwrseq";
+
+		#pwrseq-cells = <1>;
+
+		vddaon-supply = <&vreg_s6a_0p95>;
+		vddpmu-supply = <&vreg_s2f_0p95>;
+		vddrfa1-supply = <&vreg_s2f_0p95>;
+		vddrfa2-supply = <&vreg_s8c_1p3>;
+		vddrfa3-supply = <&vreg_s5a_1p9>;
+		vddpcie1-supply = <&vreg_s8c_1p3>;
+		vddpcie2-supply = <&vreg_s5a_1p9>;
+		vddio-supply = <&vreg_s4a_1p8>;
+
+		bt-enable-gpios = <&tlmm 21 GPIO_ACTIVE_HIGH>;
+		wifi-enable-gpios = <&tlmm 20 GPIO_ACTIVE_HIGH>;
+		swctrl-gpios = <&tlmm 124 GPIO_ACTIVE_HIGH>;
+	};
+
 	thermal-zones {
 		conn-thermal {
 			polling-delay-passive = <0>;
@@ -804,6 +824,26 @@ lt9611_rst_pin: lt9611-rst-pin {
 	};
 };
 
+&qup_uart6_default {
+	ctsrx {
+		pins = "gpio16", "gpio19";
+		drive-strength = <2>;
+		bias-disable;
+	};
+
+	rts {
+		pins = "gpio17";
+		drive-strength = <2>;
+		bias-disable;
+	};
+
+	tx {
+		pins = "gpio18";
+		drive-strength = <2>;
+		bias-pull-up;
+	};
+};
+
 &qupv3_id_0 {
 	status = "okay";
 };
@@ -1193,6 +1233,16 @@ sdc2_card_det_n: sd-card-det-n {
 	};
 };
 
+&uart6 {
+	status = "okay";
+	bluetooth {
+		compatible = "qcom,qca6390-bt";
+		clocks = <&sleep_clk>;
+
+		bt-pwrseq = <&qca_pwrseq 1>;
+	};
+};
+
 &uart12 {
 	status = "okay";
 };
-- 
2.33.0


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[PATCH v1 13/15] arm64: dts: qcom: sdm845-db845c: add second channel to qca power sequencer

[Dmitry Baryshkov]

On DB845c board WiFi/BT chip can use both RF channels/antennas, so add
vddch1-supply property.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 arch/arm64/boot/dts/qcom/sdm845-db845c.dts | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sdm845-db845c.dts b/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
index a6a34a959a91..0f3214c60980 100644
--- a/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
+++ b/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
@@ -342,6 +342,12 @@ vreg_l21a_2p95: ldo21 {
 			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
 		};
 
+		vreg_l23a_3p3: ldo23 {
+			regulator-min-microvolt = <3300000>;
+			regulator-max-microvolt = <3312000>;
+			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
+		};
+
 		vreg_l24a_3p075: ldo24 {
 			regulator-min-microvolt = <3088000>;
 			regulator-max-microvolt = <3088000>;
@@ -637,6 +643,7 @@ &qca_pwrseq {
 	vddxo-supply = <&vreg_l7a_1p8>;
 	vddrf-supply = <&vreg_l17a_1p3>;
 	vddch0-supply = <&vreg_l25a_3p3>;
+	vddch1-supply = <&vreg_l23a_3p3>;
 };
 
 &sdhc_2 {
-- 
2.33.0


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[PATCH v1 14/15] WIP: PCI: qcom: use pwrseq to power up bus devices

[Dmitry Baryshkov]

Use bus-pwrseq device tree node to power up the devices on the bus. This
is to be rewritten with the proper code parsing the device tree and
powering up individual devices.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/pci/controller/dwc/pcie-qcom.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 8a7a300163e5..f398283912c7 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -23,6 +23,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/platform_device.h>
 #include <linux/phy/phy.h>
+#include <linux/pwrseq/consumer.h>
 #include <linux/regulator/consumer.h>
 #include <linux/reset.h>
 #include <linux/slab.h>
@@ -1467,6 +1468,7 @@ static int qcom_pcie_probe(struct platform_device *pdev)
 	struct pcie_port *pp;
 	struct dw_pcie *pci;
 	struct qcom_pcie *pcie;
+	struct pwrseq *pwrseq;
 	int ret;
 
 	pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
@@ -1520,6 +1522,17 @@ static int qcom_pcie_probe(struct platform_device *pdev)
 
 	pp->ops = &qcom_pcie_dw_ops;
 
+	pwrseq = devm_pwrseq_get(dev, "bus");
+	if (IS_ERR(pwrseq)) {
+		ret = PTR_ERR(pwrseq);
+		goto err_pm_runtime_put;
+	}
+	if (pwrseq) {
+		ret = pwrseq_full_power_on(pwrseq);
+		if (ret)
+			goto err_pm_runtime_put;
+	}
+
 	ret = phy_init(pcie->phy);
 	if (ret) {
 		pm_runtime_disable(&pdev->dev);
-- 
2.33.0


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[PATCH v1 15/15] WIP: arm64: dts: qcom: qrb5165-rb5: add bus-pwrseq property to pcie0

[Dmitry Baryshkov]

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 arch/arm64/boot/dts/qcom/qrb5165-rb5.dts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/qcom/qrb5165-rb5.dts b/arch/arm64/boot/dts/qcom/qrb5165-rb5.dts
index 326330f528fc..0c347cb6f8e0 100644
--- a/arch/arm64/boot/dts/qcom/qrb5165-rb5.dts
+++ b/arch/arm64/boot/dts/qcom/qrb5165-rb5.dts
@@ -689,6 +689,7 @@ wifi-therm@1 {
 
 &pcie0 {
 	status = "okay";
+	bus-pwrseq = <&qca_pwrseq 0>;
 };
 
 &pcie0_phy {
-- 
2.33.0


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Re: [PATCH v1 00/15] create power sequencing subsystem

[Kalle Valo]

Dmitry Baryshkov <dmitry.baryshkov@linaro.org> writes:

> This is a proposed power sequencer subsystem. This is a
> generification of the MMC pwrseq code. The subsystem tries to abstract
> the idea of complex power-up/power-down/reset of the devices.
>
> The primary set of devices that promted me to create this patchset is
> the Qualcomm BT+WiFi family of chips. They reside on serial+platform
> or serial + SDIO interfaces (older generations) or on serial+PCIe (newer
> generations).

Instead of older and newer, it would be more unstandable to mention
specific chips. For example I have no clue what you mean with older
generation.

-- 
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Re: [PATCH v1 00/15] create power sequencing subsystem

[Caleb Connolly]

Hi Dmitry,

On 06/10/2021 04:53, Dmitry Baryshkov wrote:
> This is a proposed power sequencer subsystem. This is a
> generification of the MMC pwrseq code. The subsystem tries to abstract
> the idea of complex power-up/power-down/reset of the devices.
> 
> The primary set of devices that promted me to create this patchset is
> the Qualcomm BT+WiFi family of chips. They reside on serial+platform
> or serial + SDIO interfaces (older generations) or on serial+PCIe (newer
> generations).  They require a set of external voltage regulators to be
> powered on and (some of them) have separate WiFi and Bluetooth enable
> GPIOs.
> 
> The major drawback for now is the lack of proper PCIe integration
> At this moment support for PCIe is hacked up to be able to test the
> PCIe part of qca6390. Proper PCIe support would require automatically
> powering up the devices before the scan basing on the proper device
> structure in the device tree. This two last patches are noted as WIP and
> are included into the patchset for the purpose of testing WiFi on newer
> chips (like qca6390/qca6391).
> 
> Changes since RFC v2:
>   - Add documentation for the pwrseq code. Document data structures,
>     macros and exported functions.
>   - Export of_pwrseq_xlate_onecell()
>   - Add separate pwrseq_set_drvdata() function to follow the typical API
>     design
>   - Remove pwrseq_get_optional()/devm_pwrseq_get_optional()
>   - Moved code to handle old mmc-pwrseq binding to the MMC patch
>   - Split of_pwrseq_xlate_onecell() support to a separate patch
> 
> Changes since RFC v1:
>   - Provider pwrseq fallback support
>   - Implement fallback support in pwrseq_qca.
>   - Mmove susclk handling to pwrseq_qca.
>   - Significantly simplify hci_qca.c changes, by dropping all legacy
>     code. Now hci_qca uses only pwrseq calls to power up/down bluetooth
>     parts of the chip.
> 
> 
> 
Tested-by: Caleb Connolly <caleb.connolly@linaro.org>
[Tested on the OnePlus 6]

-- 
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Caleb (they/them)

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Re: [PATCH v1 00/15] create power sequencing subsystem

[Luca Weiss]

Hi Dmitry,

On Wed Oct 6, 2021 at 5:53 AM CEST, Dmitry Baryshkov wrote:
> This is a proposed power sequencer subsystem. This is a
> generification of the MMC pwrseq code. The subsystem tries to abstract
> the idea of complex power-up/power-down/reset of the devices.
>
> The primary set of devices that promted me to create this patchset is
> the Qualcomm BT+WiFi family of chips. They reside on serial+platform
> or serial + SDIO interfaces (older generations) or on serial+PCIe (newer
> generations).  They require a set of external voltage regulators to be
> powered on and (some of them) have separate WiFi and Bluetooth enable
> GPIOs.
>
> The major drawback for now is the lack of proper PCIe integration
> At this moment support for PCIe is hacked up to be able to test the
> PCIe part of qca6390. Proper PCIe support would require automatically
> powering up the devices before the scan basing on the proper device
> structure in the device tree. This two last patches are noted as WIP and
> are included into the patchset for the purpose of testing WiFi on newer
> chips (like qca6390/qca6391).

What's the status of this series? With this I have gotten Bluetooth to
somewhat work on sm7225-fairphone-fp4, which is using WCN3990/WCN3988.

Is there another solution with a different patch series that could make
it work also?

The latest I could find regarding some new Bluetooth thing is the
following email from June 2022, but nothing seems to have happened since
then.
https://lore.kernel.org/linux-arm-msm/SJ0PR02MB7135746D204F13550E9BAE77F8B29@SJ0PR02MB7135.namprd02.prod.outlook.com/

Regards
Luca

>
> Changes since RFC v2:
>  - Add documentation for the pwrseq code. Document data structures,
>    macros and exported functions.
>  - Export of_pwrseq_xlate_onecell()
>  - Add separate pwrseq_set_drvdata() function to follow the typical API
>    design
>  - Remove pwrseq_get_optional()/devm_pwrseq_get_optional()
>  - Moved code to handle old mmc-pwrseq binding to the MMC patch
>  - Split of_pwrseq_xlate_onecell() support to a separate patch
>
> Changes since RFC v1:
>  - Provider pwrseq fallback support
>  - Implement fallback support in pwrseq_qca.
>  - Mmove susclk handling to pwrseq_qca.
>  - Significantly simplify hci_qca.c changes, by dropping all legacy
>    code. Now hci_qca uses only pwrseq calls to power up/down bluetooth
>    parts of the chip.


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Re: [PATCH v1 00/15] create power sequencing subsystem

[Matthias Kaehlcke]

Hi Dmitry,

Do you still plan to refresh this series?

I know there have been multiple attempts to get something similar
landed in the past 10 year or so. Your series didn't seem to get
much pushback from maintainers, might be worth sending a refresh :)

Thanks

Matthias

On Wed, Oct 06, 2021 at 06:53:52AM +0300, Dmitry Baryshkov wrote:
> This is a proposed power sequencer subsystem. This is a
> generification of the MMC pwrseq code. The subsystem tries to abstract
> the idea of complex power-up/power-down/reset of the devices.
> 
> The primary set of devices that promted me to create this patchset is
> the Qualcomm BT+WiFi family of chips. They reside on serial+platform
> or serial + SDIO interfaces (older generations) or on serial+PCIe (newer
> generations).  They require a set of external voltage regulators to be
> powered on and (some of them) have separate WiFi and Bluetooth enable
> GPIOs.
> 
> The major drawback for now is the lack of proper PCIe integration
> At this moment support for PCIe is hacked up to be able to test the
> PCIe part of qca6390. Proper PCIe support would require automatically
> powering up the devices before the scan basing on the proper device
> structure in the device tree. This two last patches are noted as WIP and
> are included into the patchset for the purpose of testing WiFi on newer
> chips (like qca6390/qca6391).
> 
> Changes since RFC v2:
>  - Add documentation for the pwrseq code. Document data structures,
>    macros and exported functions.
>  - Export of_pwrseq_xlate_onecell()
>  - Add separate pwrseq_set_drvdata() function to follow the typical API
>    design
>  - Remove pwrseq_get_optional()/devm_pwrseq_get_optional()
>  - Moved code to handle old mmc-pwrseq binding to the MMC patch
>  - Split of_pwrseq_xlate_onecell() support to a separate patch
> 
> Changes since RFC v1:
>  - Provider pwrseq fallback support
>  - Implement fallback support in pwrseq_qca.
>  - Mmove susclk handling to pwrseq_qca.
>  - Significantly simplify hci_qca.c changes, by dropping all legacy
>    code. Now hci_qca uses only pwrseq calls to power up/down bluetooth
>    parts of the chip.
> 
> 
> 
> 
> _______________________________________________
> ath10k mailing list
> ath10k@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/ath10k

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Re: [PATCH v1 00/15] create power sequencing subsystem

[Dmitry Baryshkov]

Ho,

On Thu, 13 Oct 2022 at 22:50, Matthias Kaehlcke <mka@chromium.org> wrote:
> Do you still plan to refresh this series?
>
> I know there have been multiple attempts to get something similar
> landed in the past 10 year or so. Your series didn't seem to get
> much pushback from maintainers, might be worth sending a refresh :)

Yes, I hope to return to it eventually. I just had no time for it lately.

> On Wed, Oct 06, 2021 at 06:53:52AM +0300, Dmitry Baryshkov wrote:
> > This is a proposed power sequencer subsystem. This is a
> > generification of the MMC pwrseq code. The subsystem tries to abstract
> > the idea of complex power-up/power-down/reset of the devices.
> >
> > The primary set of devices that promted me to create this patchset is
> > the Qualcomm BT+WiFi family of chips. They reside on serial+platform
> > or serial + SDIO interfaces (older generations) or on serial+PCIe (newer
> > generations).  They require a set of external voltage regulators to be
> > powered on and (some of them) have separate WiFi and Bluetooth enable
> > GPIOs.
> >
> > The major drawback for now is the lack of proper PCIe integration
> > At this moment support for PCIe is hacked up to be able to test the
> > PCIe part of qca6390. Proper PCIe support would require automatically
> > powering up the devices before the scan basing on the proper device
> > structure in the device tree. This two last patches are noted as WIP and
> > are included into the patchset for the purpose of testing WiFi on newer
> > chips (like qca6390/qca6391).
> >
> > Changes since RFC v2:
> >  - Add documentation for the pwrseq code. Document data structures,
> >    macros and exported functions.
> >  - Export of_pwrseq_xlate_onecell()
> >  - Add separate pwrseq_set_drvdata() function to follow the typical API
> >    design
> >  - Remove pwrseq_get_optional()/devm_pwrseq_get_optional()
> >  - Moved code to handle old mmc-pwrseq binding to the MMC patch
> >  - Split of_pwrseq_xlate_onecell() support to a separate patch
> >
> > Changes since RFC v1:
> >  - Provider pwrseq fallback support
> >  - Implement fallback support in pwrseq_qca.
> >  - Mmove susclk handling to pwrseq_qca.
> >  - Significantly simplify hci_qca.c changes, by dropping all legacy
> >    code. Now hci_qca uses only pwrseq calls to power up/down bluetooth
> >    parts of the chip.
> >
> >
> >
> >
> > _______________________________________________
> > ath10k mailing list
> > ath10k@lists.infradead.org
> > http://lists.infradead.org/mailman/listinfo/ath10k



-- 
With best wishes
Dmitry

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Re: [PATCH v1 00/15] create power sequencing subsystem

[Alexander Stein]

Hi,

sorry for being late to the party.

Am Mittwoch, 19. Oktober 2022, 08:03:22 CET schrieb Dmitry Baryshkov:
> Ho,
> 
> On Thu, 13 Oct 2022 at 22:50, Matthias Kaehlcke <mka@chromium.org> wrote:
> > Do you still plan to refresh this series?
> > 
> > I know there have been multiple attempts to get something similar
> > landed in the past 10 year or so. Your series didn't seem to get
> > much pushback from maintainers, might be worth sending a refresh :)
> 
> Yes, I hope to return to it eventually. I just had no time for it lately.

I just found this thread while searching for power sequencing devices in 
Linux. From what I understand this is transforming the existing mmc pwrseq 
drivers into generic ones. What is the intention of this new subsystem? What 
is it supposed to address?
In my case I have an LTE module attached via USB, but in order to use it I 
need to perform several steps:
1. apply power supply
2. Issue a reset pulse(!), the length actually defines whether its a reset or 
poweroff/on
3a. wait for a GPIO to toggle
3b. wait a minimum time
4a. device will enumerate on USB
4b. device can be access using UART

This is something required to actually see/detect the device in the first 
place, thus it cannot be part of the device driver side.
Is this something pwrseq is supposed to address?

Best regards,
Alexander

> > On Wed, Oct 06, 2021 at 06:53:52AM +0300, Dmitry Baryshkov wrote:
> > > This is a proposed power sequencer subsystem. This is a
> > > generification of the MMC pwrseq code. The subsystem tries to abstract
> > > the idea of complex power-up/power-down/reset of the devices.
> > > 
> > > The primary set of devices that promted me to create this patchset is
> > > the Qualcomm BT+WiFi family of chips. They reside on serial+platform
> > > or serial + SDIO interfaces (older generations) or on serial+PCIe (newer
> > > generations).  They require a set of external voltage regulators to be
> > > powered on and (some of them) have separate WiFi and Bluetooth enable
> > > GPIOs.
> > > 
> > > The major drawback for now is the lack of proper PCIe integration
> > > At this moment support for PCIe is hacked up to be able to test the
> > > PCIe part of qca6390. Proper PCIe support would require automatically
> > > powering up the devices before the scan basing on the proper device
> > > structure in the device tree. This two last patches are noted as WIP and
> > > are included into the patchset for the purpose of testing WiFi on newer
> > > chips (like qca6390/qca6391).
> > > 
> > > Changes since RFC v2:
> > >  - Add documentation for the pwrseq code. Document data structures,
> > >  
> > >    macros and exported functions.
> > >  
> > >  - Export of_pwrseq_xlate_onecell()
> > >  - Add separate pwrseq_set_drvdata() function to follow the typical API
> > >  
> > >    design
> > >  
> > >  - Remove pwrseq_get_optional()/devm_pwrseq_get_optional()
> > >  - Moved code to handle old mmc-pwrseq binding to the MMC patch
> > >  - Split of_pwrseq_xlate_onecell() support to a separate patch
> > > 
> > > Changes since RFC v1:
> > >  - Provider pwrseq fallback support
> > >  - Implement fallback support in pwrseq_qca.
> > >  - Mmove susclk handling to pwrseq_qca.
> > >  - Significantly simplify hci_qca.c changes, by dropping all legacy
> > >  
> > >    code. Now hci_qca uses only pwrseq calls to power up/down bluetooth
> > >    parts of the chip.
> > > 
> > > _______________________________________________
> > > ath10k mailing list
> > > ath10k@lists.infradead.org
> > > http://lists.infradead.org/mailman/listinfo/ath10k


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Re: [PATCH v1 00/15] create power sequencing subsystem

[Ulf Hansson]

On Wed, 1 Mar 2023 at 09:17, Alexander Stein
<alexander.stein@ew.tq-group.com> wrote:
>
> Hi,
>
> sorry for being late to the party.
>
> Am Mittwoch, 19. Oktober 2022, 08:03:22 CET schrieb Dmitry Baryshkov:
> > Ho,
> >
> > On Thu, 13 Oct 2022 at 22:50, Matthias Kaehlcke <mka@chromium.org> wrote:
> > > Do you still plan to refresh this series?
> > >
> > > I know there have been multiple attempts to get something similar
> > > landed in the past 10 year or so. Your series didn't seem to get
> > > much pushback from maintainers, might be worth sending a refresh :)
> >
> > Yes, I hope to return to it eventually. I just had no time for it lately.
>
> I just found this thread while searching for power sequencing devices in
> Linux. From what I understand this is transforming the existing mmc pwrseq
> drivers into generic ones. What is the intention of this new subsystem? What
> is it supposed to address?
> In my case I have an LTE module attached via USB, but in order to use it I
> need to perform several steps:
> 1. apply power supply
> 2. Issue a reset pulse(!), the length actually defines whether its a reset or
> poweroff/on
> 3a. wait for a GPIO to toggle
> 3b. wait a minimum time
> 4a. device will enumerate on USB
> 4b. device can be access using UART
>
> This is something required to actually see/detect the device in the first
> place, thus it cannot be part of the device driver side.
> Is this something pwrseq is supposed to address?

Yes, this is one of those typical use-cases for discoverable buses
that we need to add support for, in one way or the other.

>
> Best regards,
> Alexander

[...]

Kind regards
Uffe

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