linux-kernel - Re: [PATCH 2/3] ARM: dts: imx6ulz-bsh-smm-m2: Enable uart2

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Message-ID: <20250522095724.GA14761@nxa18884-linux>
Date: Thu, 22 May 2025 17:57:24 +0800
From: Peng Fan <peng.fan@....nxp.com>
To: Michael Nazzareno Trimarchi <michael@...rulasolutions.com>
Cc: Dario Binacchi <dario.binacchi@...rulasolutions.com>,
	linux-kernel@...r.kernel.org, linux-amarula@...rulasolutions.com,
	Wolfgang Birkner <wolfgang.birkner@...g.com>,
	Conor Dooley <conor+dt@...nel.org>,
	Fabio Estevam <festevam@...il.com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Rob Herring <robh@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Shawn Guo <shawnguo@...nel.org>, devicetree@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/3] ARM: dts: imx6ulz-bsh-smm-m2: Enable uart2

On Fri, May 16, 2025 at 12:11:54PM +0200, Michael Nazzareno Trimarchi wrote:
>Hi
>
>
>On Fri, May 16, 2025 at 4:56???AM Peng Fan <peng.fan@....nxp.com> wrote:
>>
>> On Wed, May 14, 2025 at 09:05:34AM +0200, Dario Binacchi wrote:
>> >From: Wolfgang Birkner <wolfgang.birkner@...g.com>
>> >
>> >uart2 is used as wake up source.
>> >
>> >Signed-off-by: Wolfgang Birkner <wolfgang.birkner@...g.com>
>> >Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com>
>> >---
>> >
>> > arch/arm/boot/dts/nxp/imx/imx6ulz-bsh-smm-m2.dts | 4 ++++
>> > 1 file changed, 4 insertions(+)
>> >
>> >diff --git a/arch/arm/boot/dts/nxp/imx/imx6ulz-bsh-smm-m2.dts b/arch/arm/boot/dts/nxp/imx/imx6ulz-bsh-smm-m2.dts
>> >index 5c32d1e3675c..fff21f28c552 100644
>> >--- a/arch/arm/boot/dts/nxp/imx/imx6ulz-bsh-smm-m2.dts
>> >+++ b/arch/arm/boot/dts/nxp/imx/imx6ulz-bsh-smm-m2.dts
>> >@@ -37,6 +37,10 @@ &snvs_poweroff {
>> >       status = "okay";
>> > };
>> >
>> >+&uart2 {
>> >+      status = "okay";
>> >+};
>>
>> No need pinctrl settings?
>>
>
>We found out that in imx6ulz, if we don't enable wakeup on uart2 (or
>other uarts that do not conflict on pinout) we are not able to wake up
>from uart4, which is the console.
>According to the TRM and the code everything look fine but the real
>result it's we stuck in suspend
>
>Here is how we are able to resume.
>
>uart2
>echo enabled > wakeup
>uart4
>echo enabled > wakeup

No idea. 

But at least put some info in commit log to describe why set uart2 as okay.

Thanks,
Peng

>
>Michael
>
>> Regards,
>> Peng
>>
>> >+
>> > &uart3 {
>> >       pinctrl-names = "default";
>> >       pinctrl-0 = <&pinctrl_uart3>;
>> >--
>> >2.43.0
>> >
>> >base-commit: e9565e23cd89d4d5cd4388f8742130be1d6f182d
>> >branch: bsh-202505-imx6ulz_smm_m2
>>
>>
>
>
>-- 
>Michael Nazzareno Trimarchi
>Co-Founder & Chief Executive Officer
>M. +39 347 913 2170
>michael@...rulasolutions.com
>__________________________________
>
>Amarula Solutions BV
>Joop Geesinkweg 125, 1114 AB, Amsterdam, NL
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