[PATCH 0/3] Add Qualcomm Technologies, Inc. PM8008 MFD driver

[PATCH 0/3] Add Qualcomm Technologies, Inc. PM8008 MFD driver

[Guru Das Srinagesh]

This driver is dependent on changes that have been made to the regmap-irq
framework that have currently been accepted [1][2] in regmap.git upstream by
Mark Brown but haven't made it to Linus' tree yet. For this reason, this driver
has been based on the tip of regmap.git and not mfd.git.

Those changes, and this driver, are the result of a rewrite effort that was
promised a long ago [3]. The framework changes and this driver have been tested
and verified end-to-end on an internal platform.

[1] https://lore.kernel.org/lkml/20210318183607.gFxO2hoTO274vl3jUuxWbi19rq9wQELzN-y3B4jvO10@z/
[2] https://lore.kernel.org/lkml/161726943419.2413.4844313396830856637.b4-ty@kernel.org/
[3] https://lore.kernel.org/lkml/20200519185757.GA13992@codeaurora.org/

Guru Das Srinagesh (3):
  dt-bindings: mfd: pm8008: Add IRQ listing
  dt-bindings: mfd: pm8008: Add bindings
  mfd: pm8008: Add driver for QCOM PM8008 PMIC

 .../devicetree/bindings/mfd/qcom,pm8008.yaml       | 120 +++++++++
 drivers/mfd/Kconfig                                |  15 ++
 drivers/mfd/Makefile                               |   1 +
 drivers/mfd/qcom-pm8008.c                          | 284 +++++++++++++++++++++
 include/dt-bindings/mfd/qcom-pm8008.h              |  19 ++
 5 files changed, 439 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/qcom,pm8008.yaml
 create mode 100644 drivers/mfd/qcom-pm8008.c
 create mode 100644 include/dt-bindings/mfd/qcom-pm8008.h

-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

[PATCH 1/3] dt-bindings: mfd: pm8008: Add IRQ listing

[Guru Das Srinagesh]

Add a header file listing all of the IRQs that Qualcomm Technologies,
Inc. PM8008 supports. The constants defined in this file may be used in
the client device tree node to specify interrupts.

Change-Id: I13fb096da54458f2882e8d853a3ad9c379e7d5a9
Signed-off-by: Guru Das Srinagesh <gurus@codeaurora.org>
---
 include/dt-bindings/mfd/qcom-pm8008.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 include/dt-bindings/mfd/qcom-pm8008.h

diff --git a/include/dt-bindings/mfd/qcom-pm8008.h b/include/dt-bindings/mfd/qcom-pm8008.h
new file mode 100644
index 0000000..eca9448
--- /dev/null
+++ b/include/dt-bindings/mfd/qcom-pm8008.h
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2021 The Linux Foundation. All rights reserved.
+ */
+
+#ifndef __DT_BINDINGS_MFD_QCOM_PM8008_H
+#define __DT_BINDINGS_MFD_QCOM_PM8008_H
+
+/* PM8008 IRQ numbers */
+#define PM8008_IRQ_MISC_UVLO	0
+#define PM8008_IRQ_MISC_OVLO	1
+#define PM8008_IRQ_MISC_OTST2	2
+#define PM8008_IRQ_MISC_OTST3	3
+#define PM8008_IRQ_MISC_LDO_OCP	4
+#define PM8008_IRQ_TEMP_ALARM	5
+#define PM8008_IRQ_GPIO1	6
+#define PM8008_IRQ_GPIO2	7
+
+#endif
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

Re: [PATCH 1/3] dt-bindings: mfd: pm8008: Add IRQ listing

[Bjorn Andersson]

On Thu 08 Apr 19:38 CDT 2021, Guru Das Srinagesh wrote:

> Add a header file listing all of the IRQs that Qualcomm Technologies,
> Inc. PM8008 supports. The constants defined in this file may be used in
> the client device tree node to specify interrupts.
> 
> Change-Id: I13fb096da54458f2882e8d853a3ad9c379e7d5a9

Please remember to drop the Change-Id when posting to the mailing lists.


We typically don't have defines for the IRQ numbers, but I don't mind.
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>

Regards,
Bjorn

> Signed-off-by: Guru Das Srinagesh <gurus@codeaurora.org>
> ---
>  include/dt-bindings/mfd/qcom-pm8008.h | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
>  create mode 100644 include/dt-bindings/mfd/qcom-pm8008.h
> 
> diff --git a/include/dt-bindings/mfd/qcom-pm8008.h b/include/dt-bindings/mfd/qcom-pm8008.h
> new file mode 100644
> index 0000000..eca9448
> --- /dev/null
> +++ b/include/dt-bindings/mfd/qcom-pm8008.h
> @@ -0,0 +1,19 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * Copyright (c) 2021 The Linux Foundation. All rights reserved.
> + */
> +
> +#ifndef __DT_BINDINGS_MFD_QCOM_PM8008_H
> +#define __DT_BINDINGS_MFD_QCOM_PM8008_H
> +
> +/* PM8008 IRQ numbers */
> +#define PM8008_IRQ_MISC_UVLO	0
> +#define PM8008_IRQ_MISC_OVLO	1
> +#define PM8008_IRQ_MISC_OTST2	2
> +#define PM8008_IRQ_MISC_OTST3	3
> +#define PM8008_IRQ_MISC_LDO_OCP	4
> +#define PM8008_IRQ_TEMP_ALARM	5
> +#define PM8008_IRQ_GPIO1	6
> +#define PM8008_IRQ_GPIO2	7
> +
> +#endif
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
> 

Re: [PATCH 1/3] dt-bindings: mfd: pm8008: Add IRQ listing

[Rob Herring]

On Fri, Apr 09, 2021 at 10:55:19AM -0500, Bjorn Andersson wrote:
> On Thu 08 Apr 19:38 CDT 2021, Guru Das Srinagesh wrote:
> 
> > Add a header file listing all of the IRQs that Qualcomm Technologies,
> > Inc. PM8008 supports. The constants defined in this file may be used in
> > the client device tree node to specify interrupts.
> > 
> > Change-Id: I13fb096da54458f2882e8d853a3ad9c379e7d5a9
> 
> Please remember to drop the Change-Id when posting to the mailing lists.
> 
> 
> We typically don't have defines for the IRQ numbers, but I don't mind.

But I do because then others will think it's a good idea.

> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> 
> Regards,
> Bjorn
> 
> > Signed-off-by: Guru Das Srinagesh <gurus@codeaurora.org>
> > ---
> >  include/dt-bindings/mfd/qcom-pm8008.h | 19 +++++++++++++++++++
> >  1 file changed, 19 insertions(+)
> >  create mode 100644 include/dt-bindings/mfd/qcom-pm8008.h
> > 
> > diff --git a/include/dt-bindings/mfd/qcom-pm8008.h b/include/dt-bindings/mfd/qcom-pm8008.h
> > new file mode 100644
> > index 0000000..eca9448
> > --- /dev/null
> > +++ b/include/dt-bindings/mfd/qcom-pm8008.h
> > @@ -0,0 +1,19 @@
> > +/* SPDX-License-Identifier: GPL-2.0-only */
> > +/*
> > + * Copyright (c) 2021 The Linux Foundation. All rights reserved.
> > + */
> > +
> > +#ifndef __DT_BINDINGS_MFD_QCOM_PM8008_H
> > +#define __DT_BINDINGS_MFD_QCOM_PM8008_H
> > +
> > +/* PM8008 IRQ numbers */
> > +#define PM8008_IRQ_MISC_UVLO	0
> > +#define PM8008_IRQ_MISC_OVLO	1
> > +#define PM8008_IRQ_MISC_OTST2	2
> > +#define PM8008_IRQ_MISC_OTST3	3
> > +#define PM8008_IRQ_MISC_LDO_OCP	4
> > +#define PM8008_IRQ_TEMP_ALARM	5
> > +#define PM8008_IRQ_GPIO1	6
> > +#define PM8008_IRQ_GPIO2	7
> > +
> > +#endif
> > -- 
> > The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> > a Linux Foundation Collaborative Project
> > 

[PATCH 2/3] dt-bindings: mfd: pm8008: Add bindings

[Guru Das Srinagesh]

Add bindings for the Qualcomm Technologies, Inc. PM8008 MFD driver.

Signed-off-by: Guru Das Srinagesh <gurus@codeaurora.org>
---
 .../devicetree/bindings/mfd/qcom,pm8008.yaml       | 120 +++++++++++++++++++++
 1 file changed, 120 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/qcom,pm8008.yaml

diff --git a/Documentation/devicetree/bindings/mfd/qcom,pm8008.yaml b/Documentation/devicetree/bindings/mfd/qcom,pm8008.yaml
new file mode 100644
index 0000000..3af78f8
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/qcom,pm8008.yaml
@@ -0,0 +1,120 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/qcom,pm8008.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm Technologies, Inc. PM8008 PMIC bindings
+
+maintainers:
+  - Guru Das Srinagesh <gurus@codeaurora.org>
+
+description: |
+  Qualcomm Technologies, Inc. PM8008 is a dedicated camera PMIC that integrates
+  all the necessary power management, housekeeping, and interface support
+  functions into a single IC.
+
+properties:
+  compatible:
+    const: qcom,pm8008
+
+  reg:
+    description:
+      I2C slave address.
+
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+    description: Parent interrupt.
+
+  "#interrupt-cells":
+    const: 2
+
+    description: |
+      The first cell is the IRQ number, the second cell is the IRQ trigger
+      flag. All interrupts are listed in include/dt-bindings/mfd/qcom-pm8008.h.
+
+  interrupt-controller: true
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+  "pinctrl@[0-9a-f]+$":
+    type: object
+
+    description: |
+      The GPIO peripheral. This node may be specified twice, one for each GPIO.
+
+    properties:
+      compatible:
+        const: qcom,pm8008-gpio
+
+      reg:
+        description: Peripheral address of one of the two GPIO peripherals.
+        maxItems: 1
+
+      gpio-controller: true
+
+      interrupt-controller: true
+
+      "#address-cells":
+        const: 2
+
+      "#gpio-cells":
+        const: 2
+
+      required:
+        - compatible
+        - reg
+        - gpio-controller
+        - interrupt-controller
+        - "#gpio-cells"
+
+additionalProperties: false
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - "#address-cells"
+  - "#size-cells"
+  - "#interrupt-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/mfd/qcom-pm8008.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+    qupv3_se13_i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+      pm8008i@8 {
+        compatible = "qcom,mfd-pm8008";
+        reg = <0x8>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+        interrupt-controller;
+        #interrupt-cells = <2>;
+
+        interrupt-parent = <&tlmm>;
+        interrupts = <32 IRQ_TYPE_EDGE_RISING>;
+        interrupt-names = "pm8008";
+
+        pinctrl@c000 {
+          compatible = "qcom,pm8008-gpio";
+          reg = <0xc000>;
+          gpio-controller;
+          #gpio-cells = <2>;
+          interrupt-controller;
+          #interrupt-cells = <2>;
+        };
+      };
+    };
+
+...
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

Re: [PATCH 2/3] dt-bindings: mfd: pm8008: Add bindings

[Rob Herring]

On Thu, 08 Apr 2021 17:38:30 -0700, Guru Das Srinagesh wrote:
> Add bindings for the Qualcomm Technologies, Inc. PM8008 MFD driver.
> 
> Signed-off-by: Guru Das Srinagesh <gurus@codeaurora.org>
> ---
>  .../devicetree/bindings/mfd/qcom,pm8008.yaml       | 120 +++++++++++++++++++++
>  1 file changed, 120 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mfd/qcom,pm8008.yaml
> 

My bot found errors running 'make DT_CHECKER_FLAGS=-m dt_binding_check'
on your patch (DT_CHECKER_FLAGS is new in v5.13):

yamllint warnings/errors:
./Documentation/devicetree/bindings/mfd/qcom,pm8008.yaml:88:1: [error] duplication of key "additionalProperties" in mapping (key-duplicates)

dtschema/dtc warnings/errors:
make[1]: *** Deleting file 'Documentation/devicetree/bindings/mfd/qcom,pm8008.example.dts'
Traceback (most recent call last):
  File "/usr/local/bin/dt-extract-example", line 45, in <module>
    binding = yaml.load(open(args.yamlfile, encoding='utf-8').read())
  File "/usr/local/lib/python3.8/dist-packages/ruamel/yaml/main.py", line 421, in load
    return constructor.get_single_data()
  File "/usr/local/lib/python3.8/dist-packages/ruamel/yaml/constructor.py", line 111, in get_single_data
    return self.construct_document(node)
  File "/usr/local/lib/python3.8/dist-packages/ruamel/yaml/constructor.py", line 121, in construct_document
    for _dummy in generator:
  File "/usr/local/lib/python3.8/dist-packages/ruamel/yaml/constructor.py", line 714, in construct_yaml_map
    value = self.construct_mapping(node)
  File "/usr/local/lib/python3.8/dist-packages/ruamel/yaml/constructor.py", line 435, in construct_mapping
    return BaseConstructor.construct_mapping(self, node, deep=deep)
  File "/usr/local/lib/python3.8/dist-packages/ruamel/yaml/constructor.py", line 253, in construct_mapping
    if self.check_mapping_key(node, key_node, mapping, key, value):
  File "/usr/local/lib/python3.8/dist-packages/ruamel/yaml/constructor.py", line 284, in check_mapping_key
    raise DuplicateKeyError(*args)
ruamel.yaml.constructor.DuplicateKeyError: while constructing a mapping
  in "<unicode string>", line 4, column 1
found duplicate key "additionalProperties" with value "False" (original value: "False")
  in "<unicode string>", line 88, column 1

To suppress this check see:
    http://yaml.readthedocs.io/en/latest/api.html#duplicate-keys

Duplicate keys will become an error in future releases, and are errors
by default when using the new API.

make[1]: *** [Documentation/devicetree/bindings/Makefile:20: Documentation/devicetree/bindings/mfd/qcom,pm8008.example.dts] Error 1
make[1]: *** Waiting for unfinished jobs....
Traceback (most recent call last):
  File "/usr/local/bin/dt-doc-validate", line 67, in <module>
    ret = check_doc(f)
  File "/usr/local/bin/dt-doc-validate", line 25, in check_doc
    testtree = dtschema.load(filename, line_number=line_number)
  File "/usr/local/lib/python3.8/dist-packages/dtschema/lib.py", line 625, in load
    return yaml.load(f.read())
  File "/usr/local/lib/python3.8/dist-packages/ruamel/yaml/main.py", line 421, in load
    return constructor.get_single_data()
  File "/usr/local/lib/python3.8/dist-packages/ruamel/yaml/constructor.py", line 111, in get_single_data
    return self.construct_document(node)
  File "/usr/local/lib/python3.8/dist-packages/ruamel/yaml/constructor.py", line 121, in construct_document
    for _dummy in generator:
  File "/usr/local/lib/python3.8/dist-packages/ruamel/yaml/constructor.py", line 714, in construct_yaml_map
    value = self.construct_mapping(node)
  File "/usr/local/lib/python3.8/dist-packages/ruamel/yaml/constructor.py", line 435, in construct_mapping
    return BaseConstructor.construct_mapping(self, node, deep=deep)
  File "/usr/local/lib/python3.8/dist-packages/ruamel/yaml/constructor.py", line 253, in construct_mapping
    if self.check_mapping_key(node, key_node, mapping, key, value):
  File "/usr/local/lib/python3.8/dist-packages/ruamel/yaml/constructor.py", line 284, in check_mapping_key
    raise DuplicateKeyError(*args)
ruamel.yaml.constructor.DuplicateKeyError: while constructing a mapping
  in "<unicode string>", line 4, column 1
found duplicate key "additionalProperties" with value "False" (original value: "False")
  in "<unicode string>", line 88, column 1

To suppress this check see:
    http://yaml.readthedocs.io/en/latest/api.html#duplicate-keys

Duplicate keys will become an error in future releases, and are errors
by default when using the new API.

make[1]: *** Deleting file 'Documentation/devicetree/bindings/processed-schema-examples.json'
Traceback (most recent call last):
  File "/usr/local/bin/dt-mk-schema", line 38, in <module>
    schemas = dtschema.process_schemas(args.schemas, core_schema=(not args.useronly))
  File "/usr/local/lib/python3.8/dist-packages/dtschema/lib.py", line 587, in process_schemas
    sch = process_schema(os.path.abspath(filename))
  File "/usr/local/lib/python3.8/dist-packages/dtschema/lib.py", line 561, in process_schema
    schema = load_schema(filename)
  File "/usr/local/lib/python3.8/dist-packages/dtschema/lib.py", line 126, in load_schema
    return do_load(os.path.join(schema_basedir, schema))
  File "/usr/local/lib/python3.8/dist-packages/dtschema/lib.py", line 112, in do_load
    return yaml.load(tmp)
  File "/usr/local/lib/python3.8/dist-packages/ruamel/yaml/main.py", line 421, in load
    return constructor.get_single_data()
  File "/usr/local/lib/python3.8/dist-packages/ruamel/yaml/constructor.py", line 111, in get_single_data
    return self.construct_document(node)
  File "/usr/local/lib/python3.8/dist-packages/ruamel/yaml/constructor.py", line 121, in construct_document
    for _dummy in generator:
  File "/usr/local/lib/python3.8/dist-packages/ruamel/yaml/constructor.py", line 714, in construct_yaml_map
    value = self.construct_mapping(node)
  File "/usr/local/lib/python3.8/dist-packages/ruamel/yaml/constructor.py", line 435, in construct_mapping
    return BaseConstructor.construct_mapping(self, node, deep=deep)
  File "/usr/local/lib/python3.8/dist-packages/ruamel/yaml/constructor.py", line 253, in construct_mapping
    if self.check_mapping_key(node, key_node, mapping, key, value):
  File "/usr/local/lib/python3.8/dist-packages/ruamel/yaml/constructor.py", line 284, in check_mapping_key
    raise DuplicateKeyError(*args)
ruamel.yaml.constructor.DuplicateKeyError: while constructing a mapping
  in "<unicode string>", line 4, column 1
found duplicate key "additionalProperties" with value "False" (original value: "False")
  in "<unicode string>", line 88, column 1

To suppress this check see:
    http://yaml.readthedocs.io/en/latest/api.html#duplicate-keys

Duplicate keys will become an error in future releases, and are errors
by default when using the new API.

make[1]: *** [Documentation/devicetree/bindings/Makefile:62: Documentation/devicetree/bindings/processed-schema-examples.json] Error 1
make: *** [Makefile:1414: dt_binding_check] Error 2

See https://patchwork.ozlabs.org/patch/1464089

This check can fail if there are any dependencies. The base for a patch
series is generally the most recent rc1.

If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure 'yamllint' is installed and dt-schema is up to
date:

pip3 install dtschema --upgrade

Please check and re-submit.

[PATCH 3/3] mfd: pm8008: Add driver for QCOM PM8008 PMIC

[Guru Das Srinagesh]

Qualcomm Technologies, Inc. PM8008 is a dedicated camera PMIC that
integrates all the necessary power management, housekeeping, and
interface support functions into a single IC. Its key features include
overtemperature protection, low-dropout linear regulators, GPIOs, and an
I2C interface.

Add an MFD driver to support it.

Signed-off-by: Guru Das Srinagesh <gurus@codeaurora.org>
---
Side comment to help with code review:
 The function pm8008_init() in this file is necessitated by the instruction
 outlined in commit 84267d1b18abee ("regmap: regmap-irq: Remove default irq
 type setting from core") which says:

 > If default setting is needed this should be done via normal mechanisms or by
 > chip specific code if normal mechanisms are not suitable for some reason.

 drivers/mfd/Kconfig       |  15 +++
 drivers/mfd/Makefile      |   1 +
 drivers/mfd/qcom-pm8008.c | 284 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 300 insertions(+)
 create mode 100644 drivers/mfd/qcom-pm8008.c

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index b74efa4..d75f937 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -2087,6 +2087,21 @@ config MFD_ACER_A500_EC
 	  The controller itself is ENE KB930, it is running firmware
 	  customized for the specific needs of the Acer A500 hardware.
 
+config MFD_QCOM_PM8008
+	tristate "QCOM PM8008 Power Management IC"
+	depends on I2C && OF
+	select REGMAP_I2C
+	select REGMAP_IRQ
+	help
+	  Select this option to get support for the Qualcomm Technologies, Inc.
+	  PM8008 PMIC chip. PM8008 is a dedicated camera PMIC that integrates
+	  all the necessary power management, housekeeping, and interface
+	  support functions into a single IC. This driver provides common
+	  support for accessing the device by instantiating all the child nodes
+	  under it in the device tree. Additional drivers must be enabled in
+	  order to use the functionality of the device.
+
+
 menu "Multimedia Capabilities Port drivers"
 	depends on ARCH_SA1100
 
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 834f546..a5dda823 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -264,6 +264,7 @@ obj-$(CONFIG_MFD_ROHM_BD718XX)	+= rohm-bd718x7.o
 obj-$(CONFIG_MFD_STMFX) 	+= stmfx.o
 obj-$(CONFIG_MFD_KHADAS_MCU) 	+= khadas-mcu.o
 obj-$(CONFIG_MFD_ACER_A500_EC)	+= acer-ec-a500.o
+obj-$(CONFIG_MFD_QCOM_PM8008)	+= qcom-pm8008.o
 
 obj-$(CONFIG_SGI_MFD_IOC3)	+= ioc3.o
 obj-$(CONFIG_MFD_SIMPLE_MFD_I2C)	+= simple-mfd-i2c.o
diff --git a/drivers/mfd/qcom-pm8008.c b/drivers/mfd/qcom-pm8008.c
new file mode 100644
index 0000000..9315389
--- /dev/null
+++ b/drivers/mfd/qcom-pm8008.c
@@ -0,0 +1,284 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/bitops.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/of_device.h>
+#include <dt-bindings/mfd/qcom-pm8008.h>
+
+#define I2C_INTR_STATUS_BASE	0x0550
+#define INT_RT_STS_OFFSET	0x10
+#define INT_SET_TYPE_OFFSET	0x11
+#define INT_POL_HIGH_OFFSET	0x12
+#define INT_POL_LOW_OFFSET	0x13
+#define INT_LATCHED_CLR_OFFSET	0x14
+#define INT_EN_SET_OFFSET	0x15
+#define INT_EN_CLR_OFFSET	0x16
+#define INT_LATCHED_STS_OFFSET	0x18
+
+enum {
+	PM8008_MISC,
+	PM8008_TEMP_ALARM,
+	PM8008_GPIO1,
+	PM8008_GPIO2,
+	PM8008_NUM_PERIPHS,
+};
+
+#define PM8008_PERIPH_0_BASE	0x900
+#define PM8008_PERIPH_1_BASE	0x2400
+#define PM8008_PERIPH_2_BASE	0xC000
+#define PM8008_PERIPH_3_BASE	0xC100
+
+#define PM8008_TEMP_ALARM_ADDR	PM8008_PERIPH_1_BASE
+#define PM8008_GPIO1_ADDR	PM8008_PERIPH_2_BASE
+#define PM8008_GPIO2_ADDR	PM8008_PERIPH_3_BASE
+
+#define PM8008_STATUS_BASE	(PM8008_PERIPH_0_BASE | INT_LATCHED_STS_OFFSET)
+#define PM8008_MASK_BASE	(PM8008_PERIPH_0_BASE | INT_EN_SET_OFFSET)
+#define PM8008_UNMASK_BASE	(PM8008_PERIPH_0_BASE | INT_EN_CLR_OFFSET)
+#define PM8008_TYPE_BASE	(PM8008_PERIPH_0_BASE | INT_SET_TYPE_OFFSET)
+#define PM8008_ACK_BASE		(PM8008_PERIPH_0_BASE | INT_LATCHED_CLR_OFFSET)
+#define PM8008_POLARITY_HI_BASE	(PM8008_PERIPH_0_BASE | INT_POL_HIGH_OFFSET)
+#define PM8008_POLARITY_LO_BASE	(PM8008_PERIPH_0_BASE | INT_POL_LOW_OFFSET)
+
+#define ADDRESS_OFFSET(paddr, base)	(paddr - base)
+
+#define PM8008_PERIPH_OFFSET(paddr)	\
+	ADDRESS_OFFSET(paddr, PM8008_PERIPH_0_BASE)
+
+struct pm8008_data {
+	struct device *dev;
+	struct regmap *regmap;
+	int irq;
+	struct regmap_irq_chip_data *irq_data;
+};
+
+static unsigned int p0_offs[] = {PM8008_PERIPH_OFFSET(PM8008_PERIPH_0_BASE)};
+static unsigned int p1_offs[] = {PM8008_PERIPH_OFFSET(PM8008_PERIPH_1_BASE)};
+static unsigned int p2_offs[] = {PM8008_PERIPH_OFFSET(PM8008_PERIPH_2_BASE)};
+static unsigned int p3_offs[] = {PM8008_PERIPH_OFFSET(PM8008_PERIPH_3_BASE)};
+
+static struct regmap_irq_sub_irq_map pm8008_sub_reg_offsets[] = {
+	REGMAP_IRQ_MAIN_REG_OFFSET(p0_offs),
+	REGMAP_IRQ_MAIN_REG_OFFSET(p1_offs),
+	REGMAP_IRQ_MAIN_REG_OFFSET(p2_offs),
+	REGMAP_IRQ_MAIN_REG_OFFSET(p3_offs),
+};
+
+static unsigned int pm8008_virt_regs[] = {
+	PM8008_POLARITY_HI_BASE,
+	PM8008_POLARITY_LO_BASE,
+};
+
+enum {
+	POLARITY_HI_INDEX,
+	POLARITY_LO_INDEX,
+	PM8008_NUM_VIRT_REGS,
+};
+
+static struct regmap_irq pm8008_irqs[] = {
+	/* MISC IRQs*/
+	REGMAP_IRQ_REG(PM8008_IRQ_MISC_UVLO,	PM8008_MISC,	BIT(0)),
+	REGMAP_IRQ_REG(PM8008_IRQ_MISC_OVLO,	PM8008_MISC,	BIT(1)),
+	REGMAP_IRQ_REG(PM8008_IRQ_MISC_OTST2,	PM8008_MISC,	BIT(2)),
+	REGMAP_IRQ_REG(PM8008_IRQ_MISC_OTST3,	PM8008_MISC,	BIT(3)),
+	REGMAP_IRQ_REG(PM8008_IRQ_MISC_LDO_OCP,	PM8008_MISC,	BIT(4)),
+	/* TEMP_ALARM IRQs */
+	REGMAP_IRQ_REG(PM8008_IRQ_TEMP_ALARM,	PM8008_TEMP_ALARM, BIT(0)),
+	/* GPIO1 IRQs */
+	REGMAP_IRQ_REG(PM8008_IRQ_GPIO1,	PM8008_GPIO1,	BIT(0)),
+	/* GPIO2 IRQs */
+	REGMAP_IRQ_REG(PM8008_IRQ_GPIO2,	PM8008_GPIO2,	BIT(0)),
+};
+
+static int pm8008_set_type_virt(unsigned int **virt_buf,
+				      unsigned int type, unsigned long hwirq,
+				      int reg)
+{
+	switch (type) {
+	case IRQ_TYPE_EDGE_FALLING:
+	case IRQ_TYPE_LEVEL_LOW:
+		virt_buf[POLARITY_HI_INDEX][reg] &= ~pm8008_irqs[hwirq].mask;
+		virt_buf[POLARITY_LO_INDEX][reg] |= pm8008_irqs[hwirq].mask;
+		break;
+
+	case IRQ_TYPE_EDGE_RISING:
+	case IRQ_TYPE_LEVEL_HIGH:
+		virt_buf[POLARITY_HI_INDEX][reg] |= pm8008_irqs[hwirq].mask;
+		virt_buf[POLARITY_LO_INDEX][reg] &= ~pm8008_irqs[hwirq].mask;
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		virt_buf[POLARITY_HI_INDEX][reg] |= pm8008_irqs[hwirq].mask;
+		virt_buf[POLARITY_LO_INDEX][reg] |= pm8008_irqs[hwirq].mask;
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static struct regmap_irq_chip pm8008_irq_chip = {
+	.name			= "pm8008_irq",
+	.main_status		= I2C_INTR_STATUS_BASE,
+	.num_main_regs		= 1,
+	.num_virt_regs		= PM8008_NUM_VIRT_REGS,
+	.irqs			= pm8008_irqs,
+	.num_irqs		= ARRAY_SIZE(pm8008_irqs),
+	.num_regs		= PM8008_NUM_PERIPHS,
+	.not_fixed_stride	= true,
+	.sub_reg_offsets	= pm8008_sub_reg_offsets,
+	.set_type_virt		= pm8008_set_type_virt,
+	.status_base		= PM8008_STATUS_BASE,
+	.mask_base		= PM8008_MASK_BASE,
+	.unmask_base		= PM8008_UNMASK_BASE,
+	.type_base		= PM8008_TYPE_BASE,
+	.ack_base		= PM8008_ACK_BASE,
+	.virt_reg_base		= pm8008_virt_regs,
+	.num_type_reg		= PM8008_NUM_PERIPHS,
+};
+
+static struct regmap_config qcom_mfd_regmap_cfg = {
+	.reg_bits	= 16,
+	.val_bits	= 8,
+	.max_register	= 0xFFFF,
+};
+
+static int pm8008_init(struct pm8008_data *chip)
+{
+	int rc;
+
+	/*
+	 * Set TEMP_ALARM peripheral's TYPE so that the regmap-irq framework
+	 * reads this as the default value instead of zero, the HW default.
+	 * This is required to enable the writing of TYPE registers in
+	 * regmap_irq_sync_unlock().
+	 */
+	rc = regmap_write(chip->regmap,
+			 (PM8008_TEMP_ALARM_ADDR | INT_SET_TYPE_OFFSET),
+			 BIT(0));
+	if (rc)
+		return rc;
+
+	/* Do the same for GPIO1 and GPIO2 peripherals */
+	rc = regmap_write(chip->regmap,
+			 (PM8008_GPIO1_ADDR | INT_SET_TYPE_OFFSET), BIT(0));
+	if (rc)
+		return rc;
+
+	rc = regmap_write(chip->regmap,
+			 (PM8008_GPIO2_ADDR | INT_SET_TYPE_OFFSET), BIT(0));
+
+	return rc;
+}
+
+static int pm8008_probe_irq_peripherals(struct pm8008_data *chip,
+					int client_irq)
+{
+	int rc, i;
+	struct regmap_irq_type *type;
+	struct regmap_irq_chip_data *irq_data;
+
+	rc = pm8008_init(chip);
+	if (rc) {
+		dev_err(chip->dev, "Init failed: %d\n", rc);
+		return rc;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(pm8008_irqs); i++) {
+		type = &pm8008_irqs[i].type;
+
+		type->type_reg_offset	  = pm8008_irqs[i].reg_offset;
+		type->type_rising_val	  = pm8008_irqs[i].mask;
+		type->type_falling_val	  = pm8008_irqs[i].mask;
+		type->type_level_high_val = 0;
+		type->type_level_low_val  = 0;
+
+		if (type->type_reg_offset == PM8008_MISC)
+			type->types_supported = IRQ_TYPE_EDGE_RISING;
+		else
+			type->types_supported = (IRQ_TYPE_EDGE_BOTH |
+				IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW);
+	}
+
+	rc = devm_regmap_add_irq_chip(chip->dev, chip->regmap, client_irq,
+			IRQF_SHARED, 0, &pm8008_irq_chip, &irq_data);
+	if (rc) {
+		dev_err(chip->dev, "Failed to add IRQ chip: %d\n", rc);
+		return rc;
+	}
+
+	return 0;
+}
+
+static int pm8008_probe(struct i2c_client *client,
+			     const struct i2c_device_id *id)
+{
+	int rc;
+	struct pm8008_data *chip;
+
+	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
+	chip->dev = &client->dev;
+	chip->regmap = devm_regmap_init_i2c(client, &qcom_mfd_regmap_cfg);
+	if (!chip->regmap)
+		return -ENODEV;
+
+	i2c_set_clientdata(client, chip);
+
+	if (of_find_property(chip->dev->of_node, "interrupt-controller",
+			     NULL)) {
+		rc = pm8008_probe_irq_peripherals(chip, client->irq);
+		if (rc)
+			dev_err(chip->dev, "Failed to probe irq periphs: %d\n",
+				rc);
+	}
+
+	return devm_of_platform_populate(chip->dev);
+}
+
+static int pm8008_remove(struct i2c_client *client)
+{
+	i2c_set_clientdata(client, NULL);
+
+	return 0;
+}
+
+static const struct of_device_id pm8008_match[] = {
+	{ .compatible = "qcom,pm8008", },
+	{ },
+};
+
+static const struct i2c_device_id pm8008_id[] = {
+	{ "pm8008", 0 },
+	{ },
+};
+MODULE_DEVICE_TABLE(i2c, pm8008_id);
+
+static struct i2c_driver pm8008_mfd_driver = {
+	.driver = {
+		.name = "mfd-pm8008",
+		.of_match_table = pm8008_match,
+	},
+	.probe		= pm8008_probe,
+	.remove		= pm8008_remove,
+	.id_table	= pm8008_id,
+};
+module_i2c_driver(pm8008_mfd_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("i2c:qcom-pm8008");
-- 
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