From: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Date: Thu, 28 Nov 2019 15:55:38 +0100
Subject: serial: ucc_uart: limit brg-frequency workaround to PPC32
Git-commit: b0816f88b9b5a829401a1473e51c7001940d616f
Patch-mainline: v5.6-rc1
References: jsc#SLE-12251
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>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@suse.com>
---
drivers/tty/serial/ucc_uart.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/tty/serial/ucc_uart.c b/drivers/tty/serial/ucc_uart.c
index c055abf4c919..9436b93d5cfa 100644
--- a/drivers/tty/serial/ucc_uart.c
+++ b/drivers/tty/serial/ucc_uart.c
@@ -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
--
2.26.2