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serial: pl01x: Add support for devices with the rate pre-configured.

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For Raspberry Pi, we had the input clock rate to the pl011 fixed in
the rpi.c file, but it may be changed by firmware due to user changes
to config.txt.  Since the firmware always sets up the uart (default
115200 output unless the user changes it), we can just skip our own
uart init to simplify the boot process and more reliably get serial
output.

Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Tom Rini <trini@konsulko.com>
Tested-by: Stephen Warren <swarren@wwwdotorg.org>
This commit is contained in:
Eric Anholt 2016-03-13 18:16:54 -07:00 • committed by Tom Rini
parent 9a6598daaf
commit cd0fa5bff8
3 changed files with 12 additions and 3 deletions
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2
board/raspberrypi/rpi/rpi.c
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@ -37,7 +37,7 @@ static const struct pl01x_serial_platdata serial_platdata = {
.base = 0x20201000,
#endif
.type = TYPE_PL011,
.clock = 3000000,
.skip_init = true,
};
U_BOOT_DEVICE(bcm2835_serials) = {