[PATCH v2] rtc: pcf8563: add SMBus support

[Michael Walle <mwalle@kernel.org>]

Since commit 00f1bb9b8486 ("rtc: pcf8563: Switch to regmap") the driver
uses regmap to access the RTC. Regmap itself will figure out if there is
a suitable I2C or SMBus host controllers. Thus, don't restict the driver
to just I2C controllers and make it work on SMBus controllers supporting
i2c block accesses, too.

This was tested on a custom x86 board.

Signed-off-by: Michael Walle <mwalle@kernel.org>
---
 drivers/rtc/rtc-pcf8563.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/rtc/rtc-pcf8563.c b/drivers/rtc/rtc-pcf8563.c
index 7eebdb058067..56e75664c7b4 100644
--- a/drivers/rtc/rtc-pcf8563.c
+++ b/drivers/rtc/rtc-pcf8563.c
@@ -479,7 +479,8 @@ static int pcf8563_probe(struct i2c_client *client)
 
 	dev_dbg(&client->dev, "%s\n", __func__);
 
-	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C) &&
+	    !i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
 		return -ENODEV;
 
 	pcf8563 = devm_kzalloc(&client->dev, sizeof(struct pcf8563),
-- 
2.47.3