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serial: 8250_of: assume reg-shift of 2 for mrvl,mmp-uart

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commit f4817843e39ce78aace0195a57d4e8500a65a898 upstream.

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>
This commit is contained in:
Lubomir Rintel 2019-02-24 13:00:53 +01:00 • committed by Greg Kroah-Hartman
parent a4b021ec4b
commit 9d0b55bb2a
1 changed files with 4 additions and 0 deletions

4
drivers/tty/serial/8250/8250_of.c
View file

@ -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;