linux-kernel - Re: [PATCH 1/3] arm64: dts: ti: k3-am62x-sk-common: Add serial aliases

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Message-ID: <voapiqjxe7vbavy463pjz3kjboc7pjciesqts3wbc2zueckpav@fuela22hbuwq>
Date: Fri, 7 Feb 2025 13:58:35 +0100
From: Markus Schneider-Pargmann <msp@...libre.com>
To: Nishanth Menon <nm@...com>
Cc: Vignesh Raghavendra <vigneshr@...com>, Tero Kristo <kristo@...nel.org>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Vishal Mahaveer <vishalm@...com>, 
	Kevin Hilman <khilman@...libre.com>, Dhruva Gole <d-gole@...com>, 
	Sebin Francis <sebin.francis@...com>, linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] arm64: dts: ti: k3-am62x-sk-common: Add serial
 aliases

On Mon, Feb 03, 2025 at 09:53:29PM -0600, Nishanth Menon wrote:
> On 10:34-20250203, Markus Schneider-Pargmann wrote:
> > Add aliases for mcu_uart0 and wkup_uart0.
> > 
> > Signed-off-by: Markus Schneider-Pargmann <msp@...libre.com>
> > ---
> >  arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi b/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
> > index 2f129e8cd5b9f127b1d1baab17be868938fae013..d52cb2a5a589a8e5eb325fd90324d57ec1e3783b 100644
> > --- a/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
> > +++ b/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
> > @@ -12,6 +12,8 @@
> >  
> >  / {
> >  	aliases {
> > +		serial0 = &wkup_uart0;
> > +		serial1 = &mcu_uart0;
> >  		serial2 = &main_uart0;
> >  		mmc0 = &sdhci0;
> >  		mmc1 = &sdhci1;
> > 
> > -- 
> > 2.47.2
> > 
> Are'nt these reserved nodes for DM/TIFS and MCU? What purpose does it
> serve for us to have an alias in Linux?

For IO+DDR mcu_uart0 can be a wakeup-source and pinctrl needs to be
described for that at some point. So I thought it would be helpful to
have these aliases added already.

Best
Markus

> -- 
> Regards,
> Nishanth Menon
> Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D

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