linux-kernel - Re: [PATCH 2/2] arm64: dts: ti: k3-am62l: add initial reference board file

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Message-ID: <20241120144712.dxiu34ocv7xdv5rm@bryanbrattlof.com>
Date: Wed, 20 Nov 2024 08:47:12 -0600
From: Bryan Brattlof <bb@...com>
To: Andrew Davis <afd@...com>
CC: Nishanth Menon <nm@...com>, 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>,
        <linux-arm-kernel@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] arm64: dts: ti: k3-am62l: add initial reference
 board file

On November 18, 2024 thus sayeth Andrew Davis:
> On 11/17/24 11:34 PM, Bryan Brattlof wrote:
> > From: Vignesh Raghavendra <vigneshr@...com>
> > 
> > Add the initial board file for the AM62L3's Evaluation Module.
> > 
> > Signed-off-by: Vignesh Raghavendra <vigneshr@...com>
> > Signed-off-by: Bryan Brattlof <bb@...com>
> > ---
> >   arch/arm64/boot/dts/ti/k3-am62l3-evm.dts | 54 ++++++++++++++++++++++++++++++++
> >   1 file changed, 54 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/ti/k3-am62l3-evm.dts b/arch/arm64/boot/dts/ti/k3-am62l3-evm.dts
> > new file mode 100644
> > index 0000000000000..2d59389765cab
> > --- /dev/null
> > +++ b/arch/arm64/boot/dts/ti/k3-am62l3-evm.dts
> > @@ -0,0 +1,54 @@
> > +// SPDX-License-Identifier: GPL-2.0-only or MIT
> > +/*
> > + * Device Tree file for the AM62L3 Evaluation Module
> > + * Copyright (C) 2024 Texas Instruments Incorporated - https://www.ti.com/
> > + *
> > + * Technical Reference Manual: https://www.ti.com/lit/ug/sprujb4/sprujb4.pdf
> > + */
> > +
> > +/dts-v1/;
> > +
> > +#include "k3-am62l3.dtsi"
> > +
> > +/ {
> > +	compatible = "ti,am62l3-evm", "ti,am62l3";
> > +	model = "Texas Instruments AM62L3 Evaluation Module";
> > +
> > +	aliases {
> > +		serial2 = &main_uart0;
> 
> We usually have WKUP and MCU UARTs as serial0 and serial1, we don't
> have that many, so we would never have serial1, only 0 and 2. Might
> be time we drop this odd numbering convention, at least for AM62L
> class parts..
> 

Good point. I'll see what I can come up with

> > +	};
> > +
> > +	chosen {
> > +		stdout-path = &main_uart0;
> > +	};
> > +
> > +	memory@...00000 {
> > +		reg = <0x00000000 0x80000000 0x00000000 0x80000000>;
> > +		device_type = "memory";
> > +		bootph-all;
> > +	};
> > +
> > +	reserved-memory {
> 
> Not needed until you have something to reserve.
> 

Ah I agree. I'll drop this next time.

> > +		ranges;
> > +		#address-cells = <2>;
> > +		#size-cells = <2>;
> > +	};
> > +};
> > +
> > +&pmx0 {
> > +	main_uart0_pins_default: main_uart0-default-pins {
> > +		pinctrl-single,pins = <
> > +			AM62LX_IOPAD(0x01d4, PIN_INPUT, 1)	  /* (D7)  UART0_RXD */
> > +			AM62LX_IOPAD(0x01d8, PIN_OUTPUT, 1)	  /* (A6)  UART0_TXD */
> > +		>;
> > +		bootph-all;
> > +	};
> > +};
> > +
> > +&main_uart0 {
> > +	current-speed = <115200>;
> 
> current-speed is only for UARTs that can't detect their current speed,
> our UART and driver can, so this line isn't needed.
> 

Nice! I'll drop this property as well

~Bryan