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

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commit f4817843e3 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 Chris
parent d833ac34d9
commit 1fffa2b31b
1 changed files with 4 additions and 0 deletions
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4
drivers/tty/serial/8250/8250_of.c
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@@ -97,6 +97,10 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
if (of_property_read_u32(np, "reg-offset", &prop) == 0)
port->mapbase += prop;
/* 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;