Re: [PATCH 1/2] Define FIXED_PORT flag for serial_core
- From: Alan <alan@xxxxxxxxxxxxxxxxxxx>
- Date: Tue, 20 Feb 2007 13:07:01 +0000
On Tue, 20 Feb 2007 14:19:51 +1100 (EST)
David Gibson <david@xxxxxxxxxxxxxxxxxxxxx> wrote:
At present, the serial core always allows setserial in userspace toAcked-by: Alan Cox <alan@xxxxxxxxxx>
change the port address, irq and base clock of any serial port. That
makes sense for legacy ISA ports, but not for (say) embedded ns16550
compatible serial ports at peculiar addresses. In these cases, the
kernel code configuring the ports must know exactly where they are,
and their clocking arrangements (which can be unusual on embedded
boards). It doesn't make sense for userspace to change these
settings.
Therefore, this patch defines a UPF_FIXED_PORT flag for the uart_port
structure. If this flag is set when the serial port is configured,
any attempts to alter the port's type, io address, irq or base clock
with setserial are ignored.
In addition this patch uses the new flag for on-chip serial ports
probed in arch/powerpc/kernel/legacy_serial.c, and for other
hard-wired serial ports probed by drivers/serial/of_serial.c.
Signed-off-by: David Gibson <dwg@xxxxxxxxxxx>
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- References:
- Use resource_size_t for serial MMIO addresses
- From: David Gibson
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- From: David Gibson
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