[PATCH 4/6] rtc: pm8xxx: add support for devicetree

[PATCH 4/6] rtc: pm8xxx: add support for devicetree

[Josh Cartwright]

Add support for describing the PM8921/PM8058 RTC in device tree.

Additionally:
   - drop support for describing the RTC using platform data,
     as there are no current in tree users who do so.
   - make allow_set_time a device-specific flag, instead of mucking
     with the rtc_ops

Signed-off-by: Josh Cartwright <joshc-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
---
 drivers/rtc/rtc-pm8xxx.c       | 54 +++++++++++++++++++++++-------------------
 include/linux/mfd/pm8xxx/rtc.h | 25 -------------------
 2 files changed, 30 insertions(+), 49 deletions(-)
 delete mode 100644 include/linux/mfd/pm8xxx/rtc.h

diff --git a/drivers/rtc/rtc-pm8xxx.c b/drivers/rtc/rtc-pm8xxx.c
index ed3fe83..cb5576f 100644
--- a/drivers/rtc/rtc-pm8xxx.c
+++ b/drivers/rtc/rtc-pm8xxx.c
@@ -9,7 +9,7 @@
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */
-
+#include <linux/of.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/rtc.h>
@@ -19,9 +19,6 @@
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 
-#include <linux/mfd/pm8xxx/rtc.h>
-
-
 /* RTC Register offsets from RTC CTRL REG */
 #define PM8XXX_ALARM_CTRL_OFFSET	0x01
 #define PM8XXX_RTC_WRITE_OFFSET		0x02
@@ -39,6 +36,7 @@
  * struct pm8xxx_rtc -  rtc driver internal structure
  * @rtc:		rtc device for this driver.
  * @regmap:		regmap used to access RTC registers
+ * @allow_set_time:	indicates whether writing to the RTC is allowed
  * @rtc_alarm_irq:	rtc alarm irq number.
  * @rtc_base:		address of rtc control register.
  * @rtc_read_base:	base address of read registers.
@@ -51,6 +49,7 @@
 struct pm8xxx_rtc {
 	struct rtc_device *rtc;
 	struct regmap *regmap;
+	bool allow_set_time;
 	int rtc_alarm_irq;
 	int rtc_base;
 	int rtc_read_base;
@@ -75,6 +74,9 @@ static int pm8xxx_rtc_set_time(struct device *dev, struct rtc_time *tm)
 	u8 value[NUM_8_BIT_RTC_REGS], alarm_enabled = 0, ctrl_reg;
 	struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
 
+	if (!rtc_dd->allow_set_time)
+		return -EACCES;
+
 	rtc_tm_to_time(tm, &secs);
 
 	for (i = 0; i < NUM_8_BIT_RTC_REGS; i++) {
@@ -291,8 +293,9 @@ rtc_rw_fail:
 	return rc;
 }
 
-static struct rtc_class_ops pm8xxx_rtc_ops = {
+static const struct rtc_class_ops pm8xxx_rtc_ops = {
 	.read_time	= pm8xxx_rtc_read_time,
+	.set_time	= pm8xxx_rtc_set_time,
 	.set_alarm	= pm8xxx_rtc_set_alarm,
 	.read_alarm	= pm8xxx_rtc_read_alarm,
 	.alarm_irq_enable = pm8xxx_rtc_alarm_irq_enable,
@@ -346,18 +349,26 @@ rtc_alarm_handled:
 	return IRQ_HANDLED;
 }
 
+/*
+ * Hardcoded RTC bases until IORESOURCE_REG mapping is figured out
+ */
+static const struct of_device_id pm8xxx_id_table[] = {
+	{ .compatible = "qcom,pm8921-rtc", .data = (void *) 0x11D },
+	{ .compatible = "qcom,pm8058-rtc", .data = (void *) 0x1E8 },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, pm8xxx_id_table);
+
 static int pm8xxx_rtc_probe(struct platform_device *pdev)
 {
 	int rc;
 	unsigned int ctrl_reg;
-	bool rtc_write_enable = false;
 	struct pm8xxx_rtc *rtc_dd;
-	struct resource *rtc_resource;
-	const struct pm8xxx_rtc_platform_data *pdata =
-						dev_get_platdata(&pdev->dev);
+	const struct of_device_id *match;
 
-	if (pdata != NULL)
-		rtc_write_enable = pdata->rtc_write_enable;
+	match = of_match_node(pm8xxx_id_table, pdev->dev.of_node);
+	if (!match)
+		return -ENXIO;
 
 	rtc_dd = devm_kzalloc(&pdev->dev, sizeof(*rtc_dd), GFP_KERNEL);
 	if (rtc_dd == NULL)
@@ -372,20 +383,16 @@ static int pm8xxx_rtc_probe(struct platform_device *pdev)
 		return -ENXIO;
 	}
 
-	rtc_dd->rtc_alarm_irq = platform_get_irq(pdev, 0);
+	rtc_dd->rtc_alarm_irq = platform_get_irq_byname(pdev, "alarm");
 	if (rtc_dd->rtc_alarm_irq < 0) {
 		dev_err(&pdev->dev, "Alarm IRQ resource absent!\n");
 		return -ENXIO;
 	}
 
-	rtc_resource = platform_get_resource_byname(pdev, IORESOURCE_IO,
-						    "pmic_rtc_base");
-	if (!(rtc_resource && rtc_resource->start)) {
-		dev_err(&pdev->dev, "RTC IO resource absent!\n");
-		return -ENXIO;
-	}
+	rtc_dd->allow_set_time = of_property_read_bool(pdev->dev.of_node,
+						      "linux,allow-set-time");
 
-	rtc_dd->rtc_base = rtc_resource->start;
+	rtc_dd->rtc_base = (long) match->data;
 
 	/* Setup RTC register addresses */
 	rtc_dd->rtc_write_base = rtc_dd->rtc_base + PM8XXX_RTC_WRITE_OFFSET;
@@ -412,8 +419,6 @@ static int pm8xxx_rtc_probe(struct platform_device *pdev)
 	}
 
 	rtc_dd->ctrl_reg = ctrl_reg;
-	if (rtc_write_enable)
-		pm8xxx_rtc_ops.set_time = pm8xxx_rtc_set_time;
 
 	platform_set_drvdata(pdev, rtc_dd);
 
@@ -472,9 +477,10 @@ static SIMPLE_DEV_PM_OPS(pm8xxx_rtc_pm_ops,
 static struct platform_driver pm8xxx_rtc_driver = {
 	.probe		= pm8xxx_rtc_probe,
 	.driver	= {
-		.name	= PM8XXX_RTC_DEV_NAME,
-		.owner	= THIS_MODULE,
-		.pm	= &pm8xxx_rtc_pm_ops,
+		.name		= "rtc-pm8xxx",
+		.owner		= THIS_MODULE,
+		.pm		= &pm8xxx_rtc_pm_ops,
+		.of_match_table	= pm8xxx_id_table,
 	},
 };
 
diff --git a/include/linux/mfd/pm8xxx/rtc.h b/include/linux/mfd/pm8xxx/rtc.h
deleted file mode 100644
index 14f1983..0000000
--- a/include/linux/mfd/pm8xxx/rtc.h
+++ /dev/null
@@ -1,25 +0,0 @@
-/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 and
- * only version 2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
-
-#ifndef __RTC_PM8XXX_H__
-#define __RTC_PM8XXX_H__
-
-#define PM8XXX_RTC_DEV_NAME     "rtc-pm8xxx"
-/**
- * struct pm8xxx_rtc_pdata - RTC driver platform data
- * @rtc_write_enable: variable stating RTC write capability
- */
-struct pm8xxx_rtc_platform_data {
-	bool rtc_write_enable;
-};
-
-#endif /* __RTC_PM8XXX_H__ */
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Re: [PATCH 4/6] rtc: pm8xxx: add support for devicetree

[Stephen Boyd]

On 03/05/14 11:29, Josh Cartwright wrote:
> Add support for describing the PM8921/PM8058 RTC in device tree.
>
> Additionally:
>    - drop support for describing the RTC using platform data,
>      as there are no current in tree users who do so.
>    - make allow_set_time a device-specific flag, instead of mucking
>      with the rtc_ops
>
> Signed-off-by: Josh Cartwright <joshc@codeaurora.org>
>

Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>

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Re: [PATCH 4/6] rtc: pm8xxx: add support for devicetree

[Lee Jones]

> Add support for describing the PM8921/PM8058 RTC in device tree.
> 
> Additionally:
>    - drop support for describing the RTC using platform data,
>      as there are no current in tree users who do so.
>    - make allow_set_time a device-specific flag, instead of mucking
>      with the rtc_ops
> 
> Signed-off-by: Josh Cartwright <joshc@codeaurora.org>
> ---
>  drivers/rtc/rtc-pm8xxx.c       | 54 +++++++++++++++++++++++-------------------
>  include/linux/mfd/pm8xxx/rtc.h | 25 -------------------

For the MFD changes@:
  Acked-by: Lee Jones <lee.jones@linaro.org>

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[PATCH 6/6] documentation: bindings: document PMIC8921/8058 RTC

[Josh Cartwright]

This RTC is found on the Qualcomm 8921 and 8058 PMICs.

Signed-off-by: Josh Cartwright <joshc@codeaurora.org>
---
 .../devicetree/bindings/rtc/qcom,pm8xxx-rtc.txt    | 29 ++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/rtc/qcom,pm8xxx-rtc.txt

diff --git a/Documentation/devicetree/bindings/rtc/qcom,pm8xxx-rtc.txt b/Documentation/devicetree/bindings/rtc/qcom,pm8xxx-rtc.txt
new file mode 100644
index 0000000..699bd30
--- /dev/null
+++ b/Documentation/devicetree/bindings/rtc/qcom,pm8xxx-rtc.txt
@@ -0,0 +1,29 @@
+* Real-Time Clock for Qualcomm 8058/8921 PMICs
+
+Required properties:
+- compatible: should be one of the following.
+    * "qcom,pm8058-rtc"
+    * "qcom,pm8921-rtc"
+- reg: base address of the register region
+- reg-names: corresponding reg names for the regions listed in the 'reg'
+             property, must contain:
+     "rtc_base" - base of the RTC register region
+- interrupts: interrupt list for the RTC, must contain a single interrupt
+              specifier for the alarm interrupt
+- interrupt-names: corresponding interrupt names for the interrupts listed in
+                   the 'interrupts' property, must contain:
+     "alarm" - summary interrupt for PMIC peripherals
+
+Option properties:
+- linux,allow-set-time: indicates that the setting of RTC time is allowed by
+                        the host CPU
+
+Example:
+
+	rtc {
+		compatible = "qcom,pm8921-rtc";
+		reg = <0x11D>;
+		reg-names = "rtc_base";
+		interrupts = <0x27 0>;
+		interrupt-names = "alarm";
+	};
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Re: [PATCH 6/6] documentation: bindings: document PMIC8921/8058 RTC

[Stephen Boyd]

On 03/05/14 11:29, Josh Cartwright wrote:
> diff --git a/Documentation/devicetree/bindings/rtc/qcom,pm8xxx-rtc.txt b/Documentation/devicetree/bindings/rtc/qcom,pm8xxx-rtc.txt
> new file mode 100644
> index 0000000..699bd30
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/rtc/qcom,pm8xxx-rtc.txt
> @@ -0,0 +1,29 @@
> +* Real-Time Clock for Qualcomm 8058/8921 PMICs
> +
> +Required properties:
> +- compatible: should be one of the following.
> +    * "qcom,pm8058-rtc"
> +    * "qcom,pm8921-rtc"
> +- reg: base address of the register region
> +- reg-names: corresponding reg names for the regions listed in the 'reg'
> +             property, must contain:
> +     "rtc_base" - base of the RTC register region

optional reg-names?

> +- interrupts: interrupt list for the RTC, must contain a single interrupt
> +              specifier for the alarm interrupt
> +- interrupt-names: corresponding interrupt names for the interrupts listed in
> +                   the 'interrupts' property, must contain:
> +     "alarm" - summary interrupt for PMIC peripherals

optional interrupt-names?

> +
> +Option properties:
> +- linux,allow-set-time: indicates that the setting of RTC time is allowed by
> +                        the host CPU

Is this a "linux" property? It seems like something that other OSes
would want to know about and doesn't require any explicit knowledge
about operating  system things (like keymaps for example).

> +
> +Example:
> +
> +	rtc {

rtc@11d

> +		compatible = "qcom,pm8921-rtc";
> +		reg = <0x11D>;
> +		reg-names = "rtc_base";
> +		interrupts = <0x27 0>;
> +		interrupt-names = "alarm";
> +	};

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Re: [PATCH 6/6] documentation: bindings: document PMIC8921/8058 RTC

[Josh Cartwright]

On Wed, Mar 05, 2014 at 12:58:55PM -0800, Stephen Boyd wrote:
> On 03/05/14 11:29, Josh Cartwright wrote:
> > diff --git a/Documentation/devicetree/bindings/rtc/qcom,pm8xxx-rtc.txt b/Documentation/devicetree/bindings/rtc/qcom,pm8xxx-rtc.txt
> > new file mode 100644
> > index 0000000..699bd30
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/rtc/qcom,pm8xxx-rtc.txt
> > @@ -0,0 +1,29 @@
> > +* Real-Time Clock for Qualcomm 8058/8921 PMICs
> > +
> > +Required properties:
> > +- compatible: should be one of the following.
> > +    * "qcom,pm8058-rtc"
> > +    * "qcom,pm8921-rtc"
> > +- reg: base address of the register region
> > +- reg-names: corresponding reg names for the regions listed in the 'reg'
> > +             property, must contain:
> > +     "rtc_base" - base of the RTC register region
> 
> optional reg-names?
> 
> > +- interrupts: interrupt list for the RTC, must contain a single interrupt
> > +              specifier for the alarm interrupt
> > +- interrupt-names: corresponding interrupt names for the interrupts listed in
> > +                   the 'interrupts' property, must contain:
> > +     "alarm" - summary interrupt for PMIC peripherals
> 
> optional interrupt-names?

It isn't clear to me why these should be made optional, I hope Rob
provides some clarification in the sdhci-msm thread.

> > +
> > +Option properties:

Woops, this should be "Optional" :).

> > +- linux,allow-set-time: indicates that the setting of RTC time is allowed by
> > +                        the host CPU
> 
> Is this a "linux" property? It seems like something that other OSes
> would want to know about and doesn't require any explicit knowledge
> about operating  system things (like keymaps for example).

Yeah, I wasn't quite sure how to name this property.  It's
Linux-specific in the sense that the underlying operation method is
"set_time", but I agree this should be named something else...

How do you feel about simply "allow-set-time"?

> 
> > +
> > +Example:
> > +
> > +	rtc {
> 
> rtc@11d

Yep, thanks.

> > +		compatible = "qcom,pm8921-rtc";
> > +		reg = <0x11D>;
> > +		reg-names = "rtc_base";
> > +		interrupts = <0x27 0>;
> > +		interrupt-names = "alarm";
> > +	};
> >

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Re: [PATCH 6/6] documentation: bindings: document PMIC8921/8058 RTC

[Stephen Boyd]

On 03/05/14 16:00, Josh Cartwright wrote:
> On Wed, Mar 05, 2014 at 12:58:55PM -0800, Stephen Boyd wrote:
>> On 03/05/14 11:29, Josh Cartwright wrote:
>>> diff --git a/Documentation/devicetree/bindings/rtc/qcom,pm8xxx-rtc.txt b/Documentation/devicetree/bindings/rtc/qcom,pm8xxx-rtc.txt
>>> new file mode 100644
>>> index 0000000..699bd30
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/rtc/qcom,pm8xxx-rtc.txt
>>> @@ -0,0 +1,29 @@
>>> +* Real-Time Clock for Qualcomm 8058/8921 PMICs
>>> +
>>> +Required properties:
>>> +- compatible: should be one of the following.
>>> +    * "qcom,pm8058-rtc"
>>> +    * "qcom,pm8921-rtc"
>>> +- reg: base address of the register region
>>> +- reg-names: corresponding reg names for the regions listed in the 'reg'
>>> +             property, must contain:
>>> +     "rtc_base" - base of the RTC register region
>> optional reg-names?
>>
>>> +- interrupts: interrupt list for the RTC, must contain a single interrupt
>>> +              specifier for the alarm interrupt
>>> +- interrupt-names: corresponding interrupt names for the interrupts listed in
>>> +                   the 'interrupts' property, must contain:
>>> +     "alarm" - summary interrupt for PMIC peripherals
>> optional interrupt-names?
> It isn't clear to me why these should be made optional, I hope Rob
> provides some clarification in the sdhci-msm thread.

Looks like the driver isn't using either of these properties, so I'm not
sure why they're needed. Maybe they should just be removed.

>
>
>>> +- linux,allow-set-time: indicates that the setting of RTC time is allowed by
>>> +                        the host CPU
>> Is this a "linux" property? It seems like something that other OSes
>> would want to know about and doesn't require any explicit knowledge
>> about operating  system things (like keymaps for example).
> Yeah, I wasn't quite sure how to name this property.  It's
> Linux-specific in the sense that the underlying operation method is
> "set_time", but I agree this should be named something else...
>
> How do you feel about simply "allow-set-time"?

Sounds ok to me.

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Re: [PATCH 6/6] documentation: bindings: document PMIC8921/8058 RTC

[Josh Cartwright]

On Wed, Mar 05, 2014 at 05:31:27PM -0800, Stephen Boyd wrote:
> On 03/05/14 16:00, Josh Cartwright wrote:
> > On Wed, Mar 05, 2014 at 12:58:55PM -0800, Stephen Boyd wrote:
> >> On 03/05/14 11:29, Josh Cartwright wrote:
> >>> diff --git a/Documentation/devicetree/bindings/rtc/qcom,pm8xxx-rtc.txt b/Documentation/devicetree/bindings/rtc/qcom,pm8xxx-rtc.txt
> >>> new file mode 100644
> >>> index 0000000..699bd30
> >>> --- /dev/null
> >>> +++ b/Documentation/devicetree/bindings/rtc/qcom,pm8xxx-rtc.txt
> >>> @@ -0,0 +1,29 @@
> >>> +* Real-Time Clock for Qualcomm 8058/8921 PMICs
> >>> +
> >>> +Required properties:
> >>> +- compatible: should be one of the following.
> >>> +    * "qcom,pm8058-rtc"
> >>> +    * "qcom,pm8921-rtc"
> >>> +- reg: base address of the register region
> >>> +- reg-names: corresponding reg names for the regions listed in the 'reg'
> >>> +             property, must contain:
> >>> +     "rtc_base" - base of the RTC register region
> >> optional reg-names?
> >>
> >>> +- interrupts: interrupt list for the RTC, must contain a single interrupt
> >>> +              specifier for the alarm interrupt
> >>> +- interrupt-names: corresponding interrupt names for the interrupts listed in
> >>> +                   the 'interrupts' property, must contain:
> >>> +     "alarm" - summary interrupt for PMIC peripherals
> >> optional interrupt-names?
> > It isn't clear to me why these should be made optional, I hope Rob
> > provides some clarification in the sdhci-msm thread.
> 
> Looks like the driver isn't using either of these properties, so I'm not
> sure why they're needed. Maybe they should just be removed.

The driver does make use of platform_get_irq_byname(pdev, "alarm"), and
I expect to make use of platform_get_resource_byname(pdev, IORESOURCE_REG, "rtc_base")
in the near future.

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Re: [PATCH 6/6] documentation: bindings: document PMIC8921/8058 RTC

[Rob Herring]

On Wed, Mar 5, 2014 at 6:00 PM, Josh Cartwright <joshc@codeaurora.org> wrote:
> On Wed, Mar 05, 2014 at 12:58:55PM -0800, Stephen Boyd wrote:
>> On 03/05/14 11:29, Josh Cartwright wrote:
>> > diff --git a/Documentation/devicetree/bindings/rtc/qcom,pm8xxx-rtc.txt b/Documentation/devicetree/bindings/rtc/qcom,pm8xxx-rtc.txt
>> > new file mode 100644
>> > index 0000000..699bd30
>> > --- /dev/null
>> > +++ b/Documentation/devicetree/bindings/rtc/qcom,pm8xxx-rtc.txt
>> > @@ -0,0 +1,29 @@
>> > +* Real-Time Clock for Qualcomm 8058/8921 PMICs
>> > +
>> > +Required properties:
>> > +- compatible: should be one of the following.
>> > +    * "qcom,pm8058-rtc"
>> > +    * "qcom,pm8921-rtc"
>> > +- reg: base address of the register region
>> > +- reg-names: corresponding reg names for the regions listed in the 'reg'
>> > +             property, must contain:
>> > +     "rtc_base" - base of the RTC register region
>>
>> optional reg-names?
>>
>> > +- interrupts: interrupt list for the RTC, must contain a single interrupt
>> > +              specifier for the alarm interrupt
>> > +- interrupt-names: corresponding interrupt names for the interrupts listed in
>> > +                   the 'interrupts' property, must contain:
>> > +     "alarm" - summary interrupt for PMIC peripherals
>>
>> optional interrupt-names?
>
> It isn't clear to me why these should be made optional, I hope Rob
> provides some clarification in the sdhci-msm thread.

Because reg and interrupt names are relatively new and reluctantly
added by DT maintainers. Personally, I think it was a mistake and it
is simply Linux specific information leaking into the DT, but it did
make transition to DT easier. The requirement is still the ordering of
reg and interrupts fields must be defined and you cannot rely on the
names to define the order. It is quite pointless here since you only
have 1 field.

Rob

Re: [PATCH 6/6] documentation: bindings: document PMIC8921/8058 RTC

[Josh Cartwright]

Hey Rob-

Thanks for the reply.

On Mon, Mar 10, 2014 at 10:35:25AM -0500, Rob Herring wrote:
> On Wed, Mar 5, 2014 at 6:00 PM, Josh Cartwright <joshc@codeaurora.org> wrote:
> > On Wed, Mar 05, 2014 at 12:58:55PM -0800, Stephen Boyd wrote:
> >> On 03/05/14 11:29, Josh Cartwright wrote:
> >> > +- interrupts: interrupt list for the RTC, must contain a single interrupt
> >> > +              specifier for the alarm interrupt
> >> > +- interrupt-names: corresponding interrupt names for the interrupts listed in
> >> > +                   the 'interrupts' property, must contain:
> >> > +     "alarm" - summary interrupt for PMIC peripherals
> >>
> >> optional interrupt-names?
> >
> > It isn't clear to me why these should be made optional, I hope Rob
> > provides some clarification in the sdhci-msm thread.
>
> Because reg and interrupt names are relatively new and reluctantly
> added by DT maintainers. Personally, I think it was a mistake and it
> is simply Linux specific information leaking into the DT, but it did
> make transition to DT easier.

I don't necessarily buy the Linux-specific argument in general.  If a
devices' datasheet clearly gives names to register regions and
interrupts, what about reflecting these names in the bindings is
Linux-specific?

Now, there are probably abuses of this, where the reg-names and
interrupt-names are abused to ensure driver compatibility with devices
described in board files, and only in that case will I agree is
Linux-specific and should be strongly discouraged.

> The requirement is still the ordering of reg and interrupts fields
> must be defined and you cannot rely on the names to define the order.

Should this requirement also exist for other <foo>-names properties?

> It is quite pointless here since you only have 1 field.

Indeed in the interrupt case it is worthless, as there is only one alarm
interrupt.  However for registers I do plan to extend this binding in
the future to document a newer RTC which does split registers across
multiple named address regions.

Thanks again,
  Josh

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