linux-arm-kernel.lists.infradead.org archive mirror
 help / color / mirror / Atom feed
* [PATCH] arm64: dts: imx8mp: Disable UART4 by default on Data Modul i.MX8M Plus eDM SBC
@ 2023-12-20  0:02 Marek Vasut
  2023-12-29 23:01 ` Fabio Estevam
  2024-02-03 14:15 ` Shawn Guo
  0 siblings, 2 replies; 3+ messages in thread
From: Marek Vasut @ 2023-12-20  0:02 UTC (permalink / raw)
  To: linux-arm-kernel
  Cc: Marek Vasut, Conor Dooley, Fabio Estevam, Krzysztof Kozlowski,
	NXP Linux Team, Pengutronix Kernel Team, Rob Herring,
	Sascha Hauer, Shawn Guo, devicetree

UART4 is used as CM7 coprocessor debug UART and may not be accessible from
Linux in case it is protected by RDC. The RDC protection is set up by the
platform firmware. UART4 is not used on this platform by Linux. Disable
UART4 by default to prevent boot hangs, which occur when the RDC protection
is in place.

Fixes: 562d222f23f0 ("arm64: dts: imx8mp: Add support for Data Modul i.MX8M Plus eDM SBC")
Signed-off-by: Marek Vasut <marex@denx.de>
---
Cc: Conor Dooley <conor+dt@kernel.org>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>
Cc: NXP Linux Team <linux-imx@nxp.com>
Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: devicetree@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
---
 arch/arm64/boot/dts/freescale/imx8mp-data-modul-edm-sbc.dts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mp-data-modul-edm-sbc.dts b/arch/arm64/boot/dts/freescale/imx8mp-data-modul-edm-sbc.dts
index 34e9aecc403bd..88e1b76d7d75f 100644
--- a/arch/arm64/boot/dts/freescale/imx8mp-data-modul-edm-sbc.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mp-data-modul-edm-sbc.dts
@@ -491,7 +491,7 @@ &uart3 {	/* A53 Debug */
 &uart4 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_uart4>;
-	status = "okay";
+	status = "disabled";
 };
 
 &usb3_phy0 {
-- 
2.43.0


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply related	[flat|nested] 3+ messages in thread
end of thread, other threads:[~2024-02-03 14:15 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2023-12-20  0:02 [PATCH] arm64: dts: imx8mp: Disable UART4 by default on Data Modul i.MX8M Plus eDM SBC Marek Vasut
2023-12-29 23:01 ` Fabio Estevam
2024-02-03 14:15 ` Shawn Guo

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).