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authorLubomir Rintel <lkundrak@v3.sk>2019-02-24 15:00:53 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-02-26 14:30:45 +0300
commitf4817843e39ce78aace0195a57d4e8500a65a898 (patch)
tree21ee0a5b02b6749e98f8b604d587f1d63fc347be /drivers/tty
parentfe9ed6d2483fda55465f32924fb15bce0fac3fac (diff)
downloadlinux-f4817843e39ce78aace0195a57d4e8500a65a898.tar.xz
serial: 8250_of: assume reg-shift of 2 for mrvl,mmp-uart
There are two other drivers that bind to mrvl,mmp-uart and both of them assume register shift of 2 bits. There are device trees that lack the property and rely on that assumption. If this driver wins the race to bind to those devices, it should behave the same as the older deprecated driver. Signed-off-by: Lubomir Rintel <lkundrak@v3.sk> Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/8250/8250_of.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/tty/serial/8250/8250_of.c b/drivers/tty/serial/8250/8250_of.c
index 17da8af36aa1..0277479c87e9 100644
--- a/drivers/tty/serial/8250/8250_of.c
+++ b/drivers/tty/serial/8250/8250_of.c
@@ -130,6 +130,10 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
port->flags |= UPF_IOREMAP;
}
+ /* Compatibility with the deprecated pxa driver and 8250_pxa drivers. */
+ if (of_device_is_compatible(np, "mrvl,mmp-uart"))
+ port->regshift = 2;
+
/* Check for registers offset within the devices address range */
if (of_property_read_u32(np, "reg-shift", &prop) == 0)
port->regshift = prop;