[PATCH 3/8] rtc: pcf85063: add support for NXP PCF85063 family

[Alexander Feilke]

From: Alexander Feilke <alexander.feilke at ew.tq-group.com>

Supported devices:

- generic PCF85063 / PCF85063TP (no alarm regs)
- PCF85063A / PCF85073A (alarm regs)

Tested with TQMa8MPxL SOM from TQ-Systems GmbH.

Also add missing .data field to rv8263 which represents the number
of available registers (= linux `pcf85063_config.max_register + 1`).

Signed-off-by: Markus Niebel <Markus.Niebel at ew.tq-group.com>
Signed-off-by: Alexander Feilke <alexander.feilke at ew.tq-group.com>
---
 drivers/rtc/pcf85063.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/rtc/pcf85063.c b/drivers/rtc/pcf85063.c
index 21640b039c1..183a214a3e9 100644
--- a/drivers/rtc/pcf85063.c
+++ b/drivers/rtc/pcf85063.c
@@ -80,12 +80,18 @@ static int pcf85063_reset(struct udevice *dev)
 static int pcf85063_read(struct udevice *dev, unsigned int offset, u8 *buf,
 			 unsigned int len)
 {
+	if (offset + len > dev->driver_data)
+		return -EINVAL;
+
 	return dm_i2c_read(dev, offset, buf, len);
 }
 
 static int pcf85063_write(struct udevice *dev, unsigned int offset,
 			  const u8 *buf, unsigned int len)
 {
+	if (offset + len > dev->driver_data)
+		return -EINVAL;
+
 	return dm_i2c_write(dev, offset, buf, len);
 }
 
@@ -105,7 +111,11 @@ static int pcf85063_probe(struct udevice *dev)
 }
 
 static const struct udevice_id pcf85063_of_id[] = {
-	{ .compatible = "microcrystal,rv8263" },
+	{ .compatible = "microcrystal,rv8263", .data = 0x12 },
+	{ .compatible = "nxp,pcf85063", .data = 0xb },
+	{ .compatible = "nxp,pcf85063a", .data = 0x12 },
+	{ .compatible = "nxp,pcf85063tp", .data = 0xb },
+	{ .compatible = "nxp,pcf85073a", .data = 0x12 },
 	{ }
 };
 
-- 
2.34.1