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serial: ucc_uart: limit brg-frequency workaround to PPC32

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According to Timur Tabi

    This bug in older U-Boots is definitely PowerPC-specific

So before allowing this driver to be built for platforms other than
PPC32, make sure that we don't accept malformed device trees on those
other platforms.

Suggested-by: Timur Tabi <timur@kernel.org>
Reviewed-by: Timur Tabi <timur@kernel.org>
Acked-by: Timur Tabi <timur@kernel.org>
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Li Yang <leoyang.li@nxp.com>
This commit is contained in:
Rasmus Villemoes 2019-11-28 15:55:38 +01:00 committed by Li Yang
parent 89ad26f5f8
commit b0816f88b9
1 changed files with 7 additions and 0 deletions
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7
drivers/tty/serial/ucc_uart.c
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@ -1392,6 +1392,13 @@ static int ucc_uart_probe(struct platform_device *ofdev)
if (val)
qe_port->port.uartclk = val;
else {
if (!IS_ENABLED(CONFIG_PPC32)) {
dev_err(&ofdev->dev,
"invalid brg-frequency in device tree\n");
ret = -EINVAL;
goto out_np;
}
/*
* Older versions of U-Boot do not initialize the brg-frequency
* property, so in this case we assume the BRG frequency is