[PATCH 1/4] devicetree: Add Micro Crystal AG vendor id

[PATCH 1/4] devicetree: Add Micro Crystal AG vendor id

[Dirk Behme]

From: Oleksij Rempel <fixed-term.Oleksij.Rempel-V5te9oGctAVWk0Htik3J/w@public.gmane.org>

Signed-off-by: Oleksij Rempel <fixed-term.Oleksij.Rempel-V5te9oGctAVWk0Htik3J/w@public.gmane.org>
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
---
 Documentation/devicetree/bindings/vendor-prefixes.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
index 2c2500d..a6b39f9 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
@@ -152,6 +152,7 @@ lsi	LSI Corp. (LSI Logic)
 lltc	Linear Technology Corporation
 marvell	Marvell Technology Group Ltd.
 maxim	Maxim Integrated Products
+mc	Micro Crystal AG
 meas	Measurement Specialties
 mediatek	MediaTek Inc.
 melexis	Melexis N.V.
-- 
2.8.0

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[PATCH 2/4] dt/bindings: Add bindings for Micro Crystal rv8803

[Dirk Behme]

From: Oleksij Rempel <fixed-term.Oleksij.Rempel-V5te9oGctAVWk0Htik3J/w@public.gmane.org>

... and Epson RX8900 real time clock

Signed-off-by: Oleksij Rempel <fixed-term.Oleksij.Rempel-V5te9oGctAVWk0Htik3J/w@public.gmane.org>
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
---
 .../devicetree/bindings/rtc/epson,rx8900.txt        | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/rtc/epson,rx8900.txt

diff --git a/Documentation/devicetree/bindings/rtc/epson,rx8900.txt b/Documentation/devicetree/bindings/rtc/epson,rx8900.txt
new file mode 100644
index 0000000..51959de
--- /dev/null
+++ b/Documentation/devicetree/bindings/rtc/epson,rx8900.txt
@@ -0,0 +1,21 @@
+Real Time Clock driver for:
+  - Epson RX8900
+  - Micro Crystal rv8803
+
+Required properties:
+- compatible: should be: "mc,rv8803" or "epson,rx8900"
+- reg : the I2C address of the device for I2C
+
+Optional properties:
+- epson,vdetoff : Disable Voltage Detector. Should be set if no
+  backup battery is used.
+- trickle-diode-disable : Disable internal trickle charger diode
+
+Example:
+
+	rtc: rtc@32 {
+		compatible = "epson,rx8900"
+		reg = <0x32>;
+		epson,vdetoff;
+		trickle-diode-disable;
+	};
-- 
2.8.0

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[PATCH 3/4] rtc: rv8803: add device tree compatible names

[Dirk Behme]

From: Knut Wohlrab <Knut.Wohlrab-V5te9oGctAVWk0Htik3J/w@public.gmane.org>

Add device tree compatible names for usage in a compatible
list of alternative RTC devices.

Signed-off-by: Knut Wohlrab <Knut.Wohlrab-V5te9oGctAVWk0Htik3J/w@public.gmane.org>
Signed-off-by: Oleksij Rempel <fixed-term.Oleksij.Rempel-V5te9oGctAVWk0Htik3J/w@public.gmane.org>
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
---
 drivers/rtc/rtc-rv8803.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/rtc/rtc-rv8803.c b/drivers/rtc/rtc-rv8803.c
index f623038..62baddd 100644
--- a/drivers/rtc/rtc-rv8803.c
+++ b/drivers/rtc/rtc-rv8803.c
@@ -18,6 +18,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/rtc.h>
+#include <linux/of.h>
 
 #define RV8803_SEC			0x00
 #define RV8803_MIN			0x01
@@ -520,9 +521,19 @@ static const struct i2c_device_id rv8803_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, rv8803_id);
 
+#ifdef CONFIG_OF
+static const struct of_device_id rv8803_of_match[] = {
+	{ .compatible = "mc,rv8803", },
+	{ .compatible = "epson,rx8900", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, rv8803_of_match);
+#endif
+
 static struct i2c_driver rv8803_driver = {
 	.driver = {
 		.name = "rtc-rv8803",
+		.of_match_table = of_match_ptr(rv8803_of_match),
 	},
 	.probe		= rv8803_probe,
 	.remove		= rv8803_remove,
-- 
2.8.0

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[PATCH 4/4] rtc: rv8803: Be able to set VDETOFF and SWOFF via devcie tree

[Dirk Behme]

From: Oleksij Rempel <fixed-term.Oleksij.Rempel-V5te9oGctAVWk0Htik3J/w@public.gmane.org>

There might be designs where the power supply circuit is designed
in a way that VDETOFF and SWOFF is reuqired to be set. Otherwise the
RTC detects a power loss. Add a device tree interface for this.

Signed-off-by: Carsten Resch <Carsten.Resch-V5te9oGctAVWk0Htik3J/w@public.gmane.org>
Signed-off-by: Dirk Behme <dirk.behme-V5te9oGctAVWk0Htik3J/w@public.gmane.org>
Signed-off-by: Oleksij Rempel <fixed-term.Oleksij.Rempel-V5te9oGctAVWk0Htik3J/w@public.gmane.org>
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
---
 drivers/rtc/rtc-rv8803.c | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/drivers/rtc/rtc-rv8803.c b/drivers/rtc/rtc-rv8803.c
index 62baddd..2566d67 100644
--- a/drivers/rtc/rtc-rv8803.c
+++ b/drivers/rtc/rtc-rv8803.c
@@ -50,6 +50,10 @@
 #define RV8803_CTRL_TIE			BIT(4)
 #define RV8803_CTRL_UIE			BIT(5)
 
+#define RX8900_BACKUP_CTRL		0x18
+#define RX8900_FLAG_SWOFF		BIT(2)
+#define RX8900_FLAG_VDETOFF		BIT(3)
+
 struct rv8803_data {
 	struct i2c_client *client;
 	struct rtc_device *rtc;
@@ -423,6 +427,35 @@ static struct rtc_class_ops rv8803_rtc_ops = {
 	.ioctl = rv8803_ioctl,
 };
 
+static int rx8900_trickle_charger_init(struct rv8803_data *rv8803)
+{
+	struct i2c_client *client = rv8803->client;
+	struct device_node *node = client->dev.of_node;
+	int err;
+	u8 flags;
+
+	if (!node)
+		return 0;
+
+	if (!of_device_is_compatible(node, "epson,rx8900"))
+		return 0;
+
+	err = i2c_smbus_read_byte_data(rv8803->client, RX8900_BACKUP_CTRL);
+	if (err < 0)
+		return err;
+
+	flags = ~(RX8900_FLAG_VDETOFF | RX8900_FLAG_SWOFF) & (u8)err;
+
+	if (of_property_read_bool(node, "epson,vdetoff"))
+		flags |= RX8900_FLAG_VDETOFF;
+
+	if (of_property_read_bool(node, "trickle-diode-disable"))
+		flags |= RX8900_FLAG_SWOFF;
+
+	return i2c_smbus_write_byte_data(rv8803->client, RX8900_BACKUP_CTRL,
+					 flags);
+}
+
 static int rv8803_probe(struct i2c_client *client,
 			const struct i2c_device_id *id)
 {
@@ -498,6 +531,12 @@ static int rv8803_probe(struct i2c_client *client,
 	if (err)
 		return err;
 
+	err = rx8900_trickle_charger_init(rv8803);
+	if (err) {
+		dev_err(&client->dev, "failed to init charger\n");
+		return err;
+	}
+
 	err = device_create_bin_file(&client->dev, &rv8803_nvram_attr);
 	if (err)
 		return err;
-- 
2.8.0

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Re: [PATCH 1/4] devicetree: Add Micro Crystal AG vendor id

[Rob Herring]

On Tue, Jun 21, 2016 at 08:57:17AM +0200, Dirk Behme wrote:
> From: Oleksij Rempel <fixed-term.Oleksij.Rempel-V5te9oGctAVWk0Htik3J/w@public.gmane.org>
> 
> Signed-off-by: Oleksij Rempel <fixed-term.Oleksij.Rempel-V5te9oGctAVWk0Htik3J/w@public.gmane.org>
> Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> ---
>  Documentation/devicetree/bindings/vendor-prefixes.txt | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
> index 2c2500d..a6b39f9 100644
> --- a/Documentation/devicetree/bindings/vendor-prefixes.txt
> +++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
> @@ -152,6 +152,7 @@ lsi	LSI Corp. (LSI Logic)
>  lltc	Linear Technology Corporation
>  marvell	Marvell Technology Group Ltd.
>  maxim	Maxim Integrated Products
> +mc	Micro Crystal AG

mc is a bit short. How about microcrystal?

>  meas	Measurement Specialties
>  mediatek	MediaTek Inc.
>  melexis	Melexis N.V.
> -- 
> 2.8.0
> 
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Re: [PATCH 2/4] dt/bindings: Add bindings for Micro Crystal rv8803

[Rob Herring]

On Tue, Jun 21, 2016 at 08:57:18AM +0200, Dirk Behme wrote:
> From: Oleksij Rempel <fixed-term.Oleksij.Rempel-V5te9oGctAVWk0Htik3J/w@public.gmane.org>
> 
> ... and Epson RX8900 real time clock
> 
> Signed-off-by: Oleksij Rempel <fixed-term.Oleksij.Rempel-V5te9oGctAVWk0Htik3J/w@public.gmane.org>
> Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> ---
>  .../devicetree/bindings/rtc/epson,rx8900.txt        | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/rtc/epson,rx8900.txt
> 
> diff --git a/Documentation/devicetree/bindings/rtc/epson,rx8900.txt b/Documentation/devicetree/bindings/rtc/epson,rx8900.txt
> new file mode 100644
> index 0000000..51959de
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/rtc/epson,rx8900.txt
> @@ -0,0 +1,21 @@
> +Real Time Clock driver for:
> +  - Epson RX8900
> +  - Micro Crystal rv8803
> +
> +Required properties:
> +- compatible: should be: "mc,rv8803" or "epson,rx8900"
> +- reg : the I2C address of the device for I2C
> +
> +Optional properties:
> +- epson,vdetoff : Disable Voltage Detector. Should be set if no
> +  backup battery is used.

set to no? Looks like a boolean to me.

How about epson,vdet-disable to be consistent.

> +- trickle-diode-disable : Disable internal trickle charger diode

boolean?

Needs a vendor prefix.

> +
> +Example:
> +
> +	rtc: rtc@32 {
> +		compatible = "epson,rx8900"
> +		reg = <0x32>;
> +		epson,vdetoff;
> +		trickle-diode-disable;
> +	};
> -- 
> 2.8.0
> 
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Re: [PATCH 2/4] dt/bindings: Add bindings for Micro Crystal rv8803

[fixed-term.Oleksij.Rempel]

On 21.06.2016 23:48, Rob Herring wrote:
> On Tue, Jun 21, 2016 at 08:57:18AM +0200, Dirk Behme wrote:
>> From: Oleksij Rempel <fixed-term.Oleksij.Rempel-V5te9oGctAVWk0Htik3J/w@public.gmane.org>
>>
>> ... and Epson RX8900 real time clock
>>
>> Signed-off-by: Oleksij Rempel <fixed-term.Oleksij.Rempel-V5te9oGctAVWk0Htik3J/w@public.gmane.org>
>> Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
>> ---
>>  .../devicetree/bindings/rtc/epson,rx8900.txt        | 21 +++++++++++++++++++++
>>  1 file changed, 21 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/rtc/epson,rx8900.txt
>>
>> diff --git a/Documentation/devicetree/bindings/rtc/epson,rx8900.txt b/Documentation/devicetree/bindings/rtc/epson,rx8900.txt
>> new file mode 100644
>> index 0000000..51959de
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/rtc/epson,rx8900.txt
>> @@ -0,0 +1,21 @@
>> +Real Time Clock driver for:
>> +  - Epson RX8900
>> +  - Micro Crystal rv8803
>> +
>> +Required properties:
>> +- compatible: should be: "mc,rv8803" or "epson,rx8900"
>> +- reg : the I2C address of the device for I2C
>> +
>> +Optional properties:
>> +- epson,vdetoff : Disable Voltage Detector. Should be set if no
>> +  backup battery is used.
> 
> set to no? Looks like a boolean to me.
> 
> How about epson,vdet-disable to be consistent.
> 
>> +- trickle-diode-disable : Disable internal trickle charger diode
> 
> boolean?
> 
> Needs a vendor prefix.

This is common name used by many rtc driver without vendor prefix.

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