[PATCH 0/4] rtc: ds1307: add support for device tree and mcp7940x

[PATCH 0/4] rtc: ds1307: add support for device tree and mcp7940x

[Tomas Novotny]

This series is tested with MCP79401 and it is based on 3.18-rc6.

Tomas Novotny (4):
  rtc: ds1307: add support for mcp7940x chips
  of: add vendor prefix for Pericom Technology
  rtc: ds1307: add device tree bindings documentation
  rtc: ds1307: add device tree support

 .../devicetree/bindings/rtc/maxim,ds1307.txt       |  23 ++++
 .../devicetree/bindings/vendor-prefixes.txt        |   1 +
 drivers/rtc/rtc-ds1307.c                           | 149 ++++++++++++---------
 3 files changed, 110 insertions(+), 63 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/rtc/maxim,ds1307.txt

-- 
2.1.2

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[PATCH 1/4] rtc: ds1307: add support for mcp7940x chips

[Tomas Novotny]

MCP7940x is same RTC as MCP7941x. The difference is that MCP7941x chips
contain additional EEPROM on a different i2c address.

DS1307 driver already supports MCP7941x, so just add a new i2c device id
and rename functions and defines accordingly.

Signed-off-by: Tomas Novotny <tomas-P46umIhNmdHrBKCeMvbIDA@public.gmane.org>
---
 drivers/rtc/rtc-ds1307.c | 127 ++++++++++++++++++++++++-----------------------
 1 file changed, 64 insertions(+), 63 deletions(-)

diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index bb43cf7..4ffabb3 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -35,7 +35,7 @@ enum ds_type {
 	ds_1388,
 	ds_3231,
 	m41t00,
-	mcp7941x,
+	mcp794xx,
 	rx_8025,
 	last_ds_type /* always last */
 	/* rs5c372 too?  different address... */
@@ -46,7 +46,7 @@ enum ds_type {
 #define DS1307_REG_SECS		0x00	/* 00-59 */
 #	define DS1307_BIT_CH		0x80
 #	define DS1340_BIT_nEOSC		0x80
-#	define MCP7941X_BIT_ST		0x80
+#	define MCP794XX_BIT_ST		0x80
 #define DS1307_REG_MIN		0x01	/* 00-59 */
 #define DS1307_REG_HOUR		0x02	/* 00-23, or 1-12{am,pm} */
 #	define DS1307_BIT_12HR		0x40	/* in REG_HOUR */
@@ -54,7 +54,7 @@ enum ds_type {
 #	define DS1340_BIT_CENTURY_EN	0x80	/* in REG_HOUR */
 #	define DS1340_BIT_CENTURY	0x40	/* in REG_HOUR */
 #define DS1307_REG_WDAY		0x03	/* 01-07 */
-#	define MCP7941X_BIT_VBATEN	0x08
+#	define MCP794XX_BIT_VBATEN	0x08
 #define DS1307_REG_MDAY		0x04	/* 01-31 */
 #define DS1307_REG_MONTH	0x05	/* 01-12 */
 #	define DS1337_BIT_CENTURY	0x80	/* in REG_MONTH */
@@ -159,7 +159,7 @@ static struct chip_desc chips[last_ds_type] = {
 	[ds_3231] = {
 		.alarm		= 1,
 	},
-	[mcp7941x] = {
+	[mcp794xx] = {
 		.alarm		= 1,
 		/* this is battery backed SRAM */
 		.nvram_offset	= 0x20,
@@ -176,7 +176,8 @@ static const struct i2c_device_id ds1307_id[] = {
 	{ "ds1340", ds_1340 },
 	{ "ds3231", ds_3231 },
 	{ "m41t00", m41t00 },
-	{ "mcp7941x", mcp7941x },
+	{ "mcp7940x", mcp794xx },
+	{ "mcp7941x", mcp794xx },
 	{ "pt7c4338", ds_1307 },
 	{ "rx8025", rx_8025 },
 	{ }
@@ -439,14 +440,14 @@ static int ds1307_set_time(struct device *dev, struct rtc_time *t)
 		buf[DS1307_REG_HOUR] |= DS1340_BIT_CENTURY_EN
 				| DS1340_BIT_CENTURY;
 		break;
-	case mcp7941x:
+	case mcp794xx:
 		/*
 		 * these bits were cleared when preparing the date/time
 		 * values and need to be set again before writing the
 		 * buffer out to the device.
 		 */
-		buf[DS1307_REG_SECS] |= MCP7941X_BIT_ST;
-		buf[DS1307_REG_WDAY] |= MCP7941X_BIT_VBATEN;
+		buf[DS1307_REG_SECS] |= MCP794XX_BIT_ST;
+		buf[DS1307_REG_WDAY] |= MCP794XX_BIT_VBATEN;
 		break;
 	default:
 		break;
@@ -614,26 +615,26 @@ static const struct rtc_class_ops ds13xx_rtc_ops = {
 /*----------------------------------------------------------------------*/
 
 /*
- * Alarm support for mcp7941x devices.
+ * Alarm support for mcp794xx devices.
  */
 
-#define MCP7941X_REG_CONTROL		0x07
-#	define MCP7941X_BIT_ALM0_EN	0x10
-#	define MCP7941X_BIT_ALM1_EN	0x20
-#define MCP7941X_REG_ALARM0_BASE	0x0a
-#define MCP7941X_REG_ALARM0_CTRL	0x0d
-#define MCP7941X_REG_ALARM1_BASE	0x11
-#define MCP7941X_REG_ALARM1_CTRL	0x14
-#	define MCP7941X_BIT_ALMX_IF	(1 << 3)
-#	define MCP7941X_BIT_ALMX_C0	(1 << 4)
-#	define MCP7941X_BIT_ALMX_C1	(1 << 5)
-#	define MCP7941X_BIT_ALMX_C2	(1 << 6)
-#	define MCP7941X_BIT_ALMX_POL	(1 << 7)
-#	define MCP7941X_MSK_ALMX_MATCH	(MCP7941X_BIT_ALMX_C0 | \
-					 MCP7941X_BIT_ALMX_C1 | \
-					 MCP7941X_BIT_ALMX_C2)
-
-static void mcp7941x_work(struct work_struct *work)
+#define MCP794XX_REG_CONTROL		0x07
+#	define MCP794XX_BIT_ALM0_EN	0x10
+#	define MCP794XX_BIT_ALM1_EN	0x20
+#define MCP794XX_REG_ALARM0_BASE	0x0a
+#define MCP794XX_REG_ALARM0_CTRL	0x0d
+#define MCP794XX_REG_ALARM1_BASE	0x11
+#define MCP794XX_REG_ALARM1_CTRL	0x14
+#	define MCP794XX_BIT_ALMX_IF	(1 << 3)
+#	define MCP794XX_BIT_ALMX_C0	(1 << 4)
+#	define MCP794XX_BIT_ALMX_C1	(1 << 5)
+#	define MCP794XX_BIT_ALMX_C2	(1 << 6)
+#	define MCP794XX_BIT_ALMX_POL	(1 << 7)
+#	define MCP794XX_MSK_ALMX_MATCH	(MCP794XX_BIT_ALMX_C0 | \
+					 MCP794XX_BIT_ALMX_C1 | \
+					 MCP794XX_BIT_ALMX_C2)
+
+static void mcp794xx_work(struct work_struct *work)
 {
 	struct ds1307 *ds1307 = container_of(work, struct ds1307, work);
 	struct i2c_client *client = ds1307->client;
@@ -642,22 +643,22 @@ static void mcp7941x_work(struct work_struct *work)
 	mutex_lock(&ds1307->rtc->ops_lock);
 
 	/* Check and clear alarm 0 interrupt flag. */
-	reg = i2c_smbus_read_byte_data(client, MCP7941X_REG_ALARM0_CTRL);
+	reg = i2c_smbus_read_byte_data(client, MCP794XX_REG_ALARM0_CTRL);
 	if (reg < 0)
 		goto out;
-	if (!(reg & MCP7941X_BIT_ALMX_IF))
+	if (!(reg & MCP794XX_BIT_ALMX_IF))
 		goto out;
-	reg &= ~MCP7941X_BIT_ALMX_IF;
-	ret = i2c_smbus_write_byte_data(client, MCP7941X_REG_ALARM0_CTRL, reg);
+	reg &= ~MCP794XX_BIT_ALMX_IF;
+	ret = i2c_smbus_write_byte_data(client, MCP794XX_REG_ALARM0_CTRL, reg);
 	if (ret < 0)
 		goto out;
 
 	/* Disable alarm 0. */
-	reg = i2c_smbus_read_byte_data(client, MCP7941X_REG_CONTROL);
+	reg = i2c_smbus_read_byte_data(client, MCP794XX_REG_CONTROL);
 	if (reg < 0)
 		goto out;
-	reg &= ~MCP7941X_BIT_ALM0_EN;
-	ret = i2c_smbus_write_byte_data(client, MCP7941X_REG_CONTROL, reg);
+	reg &= ~MCP794XX_BIT_ALM0_EN;
+	ret = i2c_smbus_write_byte_data(client, MCP794XX_REG_CONTROL, reg);
 	if (ret < 0)
 		goto out;
 
@@ -669,7 +670,7 @@ out:
 	mutex_unlock(&ds1307->rtc->ops_lock);
 }
 
-static int mcp7941x_read_alarm(struct device *dev, struct rtc_wkalrm *t)
+static int mcp794xx_read_alarm(struct device *dev, struct rtc_wkalrm *t)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct ds1307 *ds1307 = i2c_get_clientdata(client);
@@ -680,11 +681,11 @@ static int mcp7941x_read_alarm(struct device *dev, struct rtc_wkalrm *t)
 		return -EINVAL;
 
 	/* Read control and alarm 0 registers. */
-	ret = ds1307->read_block_data(client, MCP7941X_REG_CONTROL, 10, regs);
+	ret = ds1307->read_block_data(client, MCP794XX_REG_CONTROL, 10, regs);
 	if (ret < 0)
 		return ret;
 
-	t->enabled = !!(regs[0] & MCP7941X_BIT_ALM0_EN);
+	t->enabled = !!(regs[0] & MCP794XX_BIT_ALM0_EN);
 
 	/* Report alarm 0 time assuming 24-hour and day-of-month modes. */
 	t->time.tm_sec = bcd2bin(ds1307->regs[3] & 0x7f);
@@ -701,14 +702,14 @@ static int mcp7941x_read_alarm(struct device *dev, struct rtc_wkalrm *t)
 		"enabled=%d polarity=%d irq=%d match=%d\n", __func__,
 		t->time.tm_sec, t->time.tm_min, t->time.tm_hour,
 		t->time.tm_wday, t->time.tm_mday, t->time.tm_mon, t->enabled,
-		!!(ds1307->regs[6] & MCP7941X_BIT_ALMX_POL),
-		!!(ds1307->regs[6] & MCP7941X_BIT_ALMX_IF),
-		(ds1307->regs[6] & MCP7941X_MSK_ALMX_MATCH) >> 4);
+		!!(ds1307->regs[6] & MCP794XX_BIT_ALMX_POL),
+		!!(ds1307->regs[6] & MCP794XX_BIT_ALMX_IF),
+		(ds1307->regs[6] & MCP794XX_MSK_ALMX_MATCH) >> 4);
 
 	return 0;
 }
 
-static int mcp7941x_set_alarm(struct device *dev, struct rtc_wkalrm *t)
+static int mcp794xx_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct ds1307 *ds1307 = i2c_get_clientdata(client);
@@ -725,7 +726,7 @@ static int mcp7941x_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 		t->enabled, t->pending);
 
 	/* Read control and alarm 0 registers. */
-	ret = ds1307->read_block_data(client, MCP7941X_REG_CONTROL, 10, regs);
+	ret = ds1307->read_block_data(client, MCP794XX_REG_CONTROL, 10, regs);
 	if (ret < 0)
 		return ret;
 
@@ -738,23 +739,23 @@ static int mcp7941x_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 	regs[8] = bin2bcd(t->time.tm_mon) + 1;
 
 	/* Clear the alarm 0 interrupt flag. */
-	regs[6] &= ~MCP7941X_BIT_ALMX_IF;
+	regs[6] &= ~MCP794XX_BIT_ALMX_IF;
 	/* Set alarm match: second, minute, hour, day, date, month. */
-	regs[6] |= MCP7941X_MSK_ALMX_MATCH;
+	regs[6] |= MCP794XX_MSK_ALMX_MATCH;
 
 	if (t->enabled)
-		regs[0] |= MCP7941X_BIT_ALM0_EN;
+		regs[0] |= MCP794XX_BIT_ALM0_EN;
 	else
-		regs[0] &= ~MCP7941X_BIT_ALM0_EN;
+		regs[0] &= ~MCP794XX_BIT_ALM0_EN;
 
-	ret = ds1307->write_block_data(client, MCP7941X_REG_CONTROL, 10, regs);
+	ret = ds1307->write_block_data(client, MCP794XX_REG_CONTROL, 10, regs);
 	if (ret < 0)
 		return ret;
 
 	return 0;
 }
 
-static int mcp7941x_alarm_irq_enable(struct device *dev, unsigned int enabled)
+static int mcp794xx_alarm_irq_enable(struct device *dev, unsigned int enabled)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct ds1307 *ds1307 = i2c_get_clientdata(client);
@@ -763,24 +764,24 @@ static int mcp7941x_alarm_irq_enable(struct device *dev, unsigned int enabled)
 	if (!test_bit(HAS_ALARM, &ds1307->flags))
 		return -EINVAL;
 
-	reg = i2c_smbus_read_byte_data(client, MCP7941X_REG_CONTROL);
+	reg = i2c_smbus_read_byte_data(client, MCP794XX_REG_CONTROL);
 	if (reg < 0)
 		return reg;
 
 	if (enabled)
-		reg |= MCP7941X_BIT_ALM0_EN;
+		reg |= MCP794XX_BIT_ALM0_EN;
 	else
-		reg &= ~MCP7941X_BIT_ALM0_EN;
+		reg &= ~MCP794XX_BIT_ALM0_EN;
 
-	return i2c_smbus_write_byte_data(client, MCP7941X_REG_CONTROL, reg);
+	return i2c_smbus_write_byte_data(client, MCP794XX_REG_CONTROL, reg);
 }
 
-static const struct rtc_class_ops mcp7941x_rtc_ops = {
+static const struct rtc_class_ops mcp794xx_rtc_ops = {
 	.read_time	= ds1307_get_time,
 	.set_time	= ds1307_set_time,
-	.read_alarm	= mcp7941x_read_alarm,
-	.set_alarm	= mcp7941x_set_alarm,
-	.alarm_irq_enable = mcp7941x_alarm_irq_enable,
+	.read_alarm	= mcp794xx_read_alarm,
+	.set_alarm	= mcp794xx_set_alarm,
+	.alarm_irq_enable = mcp794xx_alarm_irq_enable,
 };
 
 /*----------------------------------------------------------------------*/
@@ -1049,10 +1050,10 @@ static int ds1307_probe(struct i2c_client *client,
 	case ds_1388:
 		ds1307->offset = 1; /* Seconds starts at 1 */
 		break;
-	case mcp7941x:
-		rtc_ops = &mcp7941x_rtc_ops;
+	case mcp794xx:
+		rtc_ops = &mcp794xx_rtc_ops;
 		if (ds1307->client->irq > 0 && chip->alarm) {
-			INIT_WORK(&ds1307->work, mcp7941x_work);
+			INIT_WORK(&ds1307->work, mcp794xx_work);
 			want_irq = true;
 		}
 		break;
@@ -1117,18 +1118,18 @@ read_rtc:
 			dev_warn(&client->dev, "SET TIME!\n");
 		}
 		break;
-	case mcp7941x:
+	case mcp794xx:
 		/* make sure that the backup battery is enabled */
-		if (!(ds1307->regs[DS1307_REG_WDAY] & MCP7941X_BIT_VBATEN)) {
+		if (!(ds1307->regs[DS1307_REG_WDAY] & MCP794XX_BIT_VBATEN)) {
 			i2c_smbus_write_byte_data(client, DS1307_REG_WDAY,
 					ds1307->regs[DS1307_REG_WDAY]
-					| MCP7941X_BIT_VBATEN);
+					| MCP794XX_BIT_VBATEN);
 		}
 
 		/* clock halted?  turn it on, so clock can tick. */
-		if (!(tmp & MCP7941X_BIT_ST)) {
+		if (!(tmp & MCP794XX_BIT_ST)) {
 			i2c_smbus_write_byte_data(client, DS1307_REG_SECS,
-					MCP7941X_BIT_ST);
+					MCP794XX_BIT_ST);
 			dev_warn(&client->dev, "SET TIME!\n");
 			goto read_rtc;
 		}
-- 
2.1.2

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[PATCH 2/4] of: add vendor prefix for Pericom Technology

[Tomas Novotny]

Signed-off-by: Tomas Novotny <tomas@novotny.cz>
---
 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 a344ec2..8ebd82f 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
@@ -112,6 +112,7 @@ nxp	NXP Semiconductors
 onnn	ON Semiconductor Corp.
 opencores	OpenCores.org
 panasonic	Panasonic Corporation
+pericom	Pericom Technology Inc.
 phytec	PHYTEC Messtechnik GmbH
 picochip	Picochip Ltd
 plathome	Plat'Home Co., Ltd.
-- 
2.1.2

[PATCH 3/4] rtc: ds1307: add device tree bindings documentation

[Tomas Novotny]

Signed-off-by: Tomas Novotny <tomas@novotny.cz>
---
 .../devicetree/bindings/rtc/maxim,ds1307.txt       | 23 ++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/rtc/maxim,ds1307.txt

diff --git a/Documentation/devicetree/bindings/rtc/maxim,ds1307.txt b/Documentation/devicetree/bindings/rtc/maxim,ds1307.txt
new file mode 100644
index 0000000..eb6164c
--- /dev/null
+++ b/Documentation/devicetree/bindings/rtc/maxim,ds1307.txt
@@ -0,0 +1,23 @@
+* Maxim (Dallas) DS1307 and compatible Real Time Clock
+
+For example, compatible chips are Maxim DS1337, Microchip MCP794xx,
+STMicroelectronics M41T00 and Epson RX-8025.
+
+Required properties:
+- compatible: For example "maxim,ds1307" (see rtc-ds1307.c driver for a full
+  list).
+- reg: i2c address
+
+Example for DS1307:
+
+ds1307: rtc@68 {
+	compatible = "maxim,ds1307";
+	reg = <0x68>;
+};
+
+Example for MCP79401:
+
+mcp7940x: rtc@6f {
+	compatible = "microchip,mcp7940x";
+	reg = <0x6f>;
+};
-- 
2.1.2

[PATCH 4/4] rtc: ds1307: add device tree support

[Tomas Novotny]

Note that alarm interrupt and trickle charger are not handled (I have no
hardware with these features).

Signed-off-by: Tomas Novotny <tomas@novotny.cz>
---

Only the "common" compatible string for that driver (maxim,ds1307) is
documented, so checkpatch complains for the rest. If it is better to document
every compatible, I will post a new series with documentation files pointing to
the maxim,ds1307.txt.

 drivers/rtc/rtc-ds1307.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index 4ffabb3..3bb6a20 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -18,6 +18,7 @@
 #include <linux/string.h>
 #include <linux/rtc.h>
 #include <linux/bcd.h>
+#include <linux/of.h>
 #include <linux/rtc/ds1307.h>
 
 /*
@@ -1242,10 +1243,31 @@ static int ds1307_remove(struct i2c_client *client)
 	return 0;
 }
 
+#ifdef CONFIG_OF
+static const struct of_device_id ds1307_driver_dt_ids[] = {
+	/* driver_data are passed through ds1307_id */
+	{ .compatible = "maxim,ds1307" },
+	{ .compatible = "maxim,ds1337" },
+	{ .compatible = "maxim,ds1338" },
+	{ .compatible = "maxim,ds1339" },
+	{ .compatible = "maxim,ds1388" },
+	{ .compatible = "maxim,ds1340" },
+	{ .compatible = "maxim,ds3231" },
+	{ .compatible = "st,m41t00" },
+	{ .compatible = "microchip,mcp7940x" },
+	{ .compatible = "microchip,mcp7941x" },
+	{ .compatible = "pericom,pt7c4338" },
+	{ .compatible = "epson,rx8025" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ds1307_driver_dt_ids);
+#endif
+
 static struct i2c_driver ds1307_driver = {
 	.driver = {
 		.name	= "rtc-ds1307",
 		.owner	= THIS_MODULE,
+		.of_match_table	= of_match_ptr(ds1307_driver_dt_ids),
 	},
 	.probe		= ds1307_probe,
 	.remove		= ds1307_remove,
-- 
2.1.2

Re: [PATCH 0/4] rtc: ds1307: add support for device tree and mcp7940x

[Tomas Novotny]

On Mon, 24 Nov 2014 16:49:20 +0100
Tomas Novotny <tomas-P46umIhNmdHrBKCeMvbIDA@public.gmane.org> wrote:

> This series is tested with MCP79401 and it is based on 3.18-rc6.
> 
> Tomas Novotny (4):
>   rtc: ds1307: add support for mcp7940x chips
>   of: add vendor prefix for Pericom Technology
>   rtc: ds1307: add device tree bindings documentation
>   rtc: ds1307: add device tree support
> 
>  .../devicetree/bindings/rtc/maxim,ds1307.txt       |  23 ++++
>  .../devicetree/bindings/vendor-prefixes.txt        |   1 +
>  drivers/rtc/rtc-ds1307.c                           | 149 ++++++++++++---------
>  3 files changed, 110 insertions(+), 63 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/rtc/maxim,ds1307.txt

It is now in the -mm and linux-next.
Thanks to Andrew for pick up,

Tomas
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Re: [PATCH 0/4] rtc: ds1307: add support for device tree and mcp7940x

[Tomas Novotny]

Hi Andrew,

On Thu, 27 Nov 2014 16:17:41 +0100, Tomas Novotny <tomas-P46umIhNmdHrBKCeMvbIDA@public.gmane.org> wrote:
> On Mon, 24 Nov 2014 16:49:20 +0100
> Tomas Novotny <tomas-P46umIhNmdHrBKCeMvbIDA@public.gmane.org> wrote:
> 
> > This series is tested with MCP79401 and it is based on 3.18-rc6.
> > 
> > Tomas Novotny (4):
> >   rtc: ds1307: add support for mcp7940x chips
> >   of: add vendor prefix for Pericom Technology
> >   rtc: ds1307: add device tree bindings documentation
> >   rtc: ds1307: add device tree support
> >
> >  .../devicetree/bindings/rtc/maxim,ds1307.txt       |  23 ++++
> >  .../devicetree/bindings/vendor-prefixes.txt        |   1 +
> >  drivers/rtc/rtc-ds1307.c                           | 149 ++++++++++++---------
> >  3 files changed, 110 insertions(+), 63 deletions(-)
> >  create mode 100644 Documentation/devicetree/bindings/rtc/maxim,ds1307.txt
> 
> It is now in the -mm and linux-next.
> Thanks to Andrew for pick up,
> 
> Tomas

could you please remove my last two patches:
rtc-ds1307-add-device-tree-bindings-documentation.patch
rtc-ds1307-add-device-tree-support.patch
from the -mm?
	I missed that some compatible RTC's are already listed in
i2c/trivial-devices.txt. These two patches shouldn't break anything, but
document and handle already working thing.
	Better would be to follow the trivial-devices.txt and add the missing
compatibles there.
	The first two patches are ok.
	Sorry for the noise and thanks,

	Tomas
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