linux-kernel - Re: [PATCH 5/5] arm64: dts: ti: Add support for AM62-SK

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Date:   Tue, 8 Feb 2022 18:08:59 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Vignesh Raghavendra <vigneshr@...com>, Nishanth Menon <nm@...com>,
        Tero Kristo <kristo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Santosh Shilimkar <ssantosh@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] arm64: dts: ti: Add support for AM62-SK

On 08/02/2022 14:18, Vignesh Raghavendra wrote:
> From: Nishanth Menon <nm@...com>
> 
> AM62 StarterKit (SK) board is a low cost, small form factor board
> designed for TI’s AM625 SoC. It supports the following interfaces:
> * 2 GB DDR4 RAM
> * x2 Gigabit Ethernet interfaces capable of working in Switch and MAC mode
> * x1 HDMI Port with audio + x1 OLDI/LVDS Display interface for Dual Display
> * x1 Headphone Jack
> * x1 USB2.0 Hub with two Type A host and x1 USB Type-C DRP Port
> * x1 UHS-1 capable µSD card slot
> * 2.4/5 GHz WLAN + Bluetooth 4.2 through WL1837
> * 512 Mbit OSPI flash
> * x4 UART through UART-USB bridge
> * XDS110 for onboard JTAG debug using USB
> * Temperature sensors, user push buttons and LEDs
> * 40-pin User Expansion Connector
> * 24-pin header for peripherals in MCU island (I2C, UART, SPI, IO)
> * 20-pin header for Programmable Realtime Unit (PRU) IO pins
> * 15-pin CSI header
> 
> Add basic support for AM62-SK.
> 
> Schematics: https://www.ti.com/lit/zip/sprr448
> 
> Signed-off-by: Nishanth Menon <nm@...com>
> Signed-off-by: Vignesh Raghavendra <vigneshr@...com>
> ---
>  arch/arm64/boot/dts/ti/Makefile        |   2 +
>  arch/arm64/boot/dts/ti/k3-am625-sk.dts | 206 +++++++++++++++++++++++++
>  2 files changed, 208 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/ti/k3-am625-sk.dts
> 
> diff --git a/arch/arm64/boot/dts/ti/Makefile b/arch/arm64/boot/dts/ti/Makefile
> index 90be511bc4d0..02e5d80344d0 100644
> --- a/arch/arm64/boot/dts/ti/Makefile
> +++ b/arch/arm64/boot/dts/ti/Makefile
> @@ -21,3 +21,5 @@ dtb-$(CONFIG_ARCH_K3) += k3-j721s2-common-proc-board.dtb
>  
>  dtb-$(CONFIG_ARCH_K3) += k3-am642-evm.dtb
>  dtb-$(CONFIG_ARCH_K3) += k3-am642-sk.dtb
> +
> +dtb-$(CONFIG_ARCH_K3) += k3-am625-sk.dtb
> diff --git a/arch/arm64/boot/dts/ti/k3-am625-sk.dts b/arch/arm64/boot/dts/ti/k3-am625-sk.dts
> new file mode 100644
> index 000000000000..9a6ff601f44d
> --- /dev/null
> +++ b/arch/arm64/boot/dts/ti/k3-am625-sk.dts
> @@ -0,0 +1,206 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * AM625 SK: https://www.ti.com/lit/zip/sprr448
> + *
> + * Copyright (C) 2021-2022 Texas Instruments Incorporated - https://www.ti.com/
> + */
> +
> +/dts-v1/;
> +
> +#include <dt-bindings/leds/common.h>
> +#include <dt-bindings/gpio/gpio.h>
> +#include "k3-am625.dtsi"
> +
> +/ {
> +	compatible =  "ti,am625-sk", "ti,am625";
> +	model = "Texas Instruments AM625 SK";
> +
> +	aliases {
> +		serial2 = &main_uart0;
> +	};
> +
> +	chosen {
> +		stdout-path = "serial2:115200n8";
> +		bootargs = "console=ttyS2,115200n8 earlycon=ns16550a,mmio32,0x02800000";
> +	};
> +
> +	memory@...00000 {
> +		device_type = "memory";
> +		/* 2G RAM */
> +		reg = <0x00000000 0x80000000 0x00000000 0x80000000>;
> +
> +	};
> +
> +	reserved-memory {
> +		#address-cells = <2>;
> +		#size-cells = <2>;
> +		ranges;
> +
> +		secure_tfa_ddr: tfa@...80000 {
> +			reg = <0x00 0x9e780000 0x00 0x80000>;
> +			alignment = <0x1000>;
> +			no-map;
> +		};
> +
> +		secure_ddr: optee@...00000 {
> +			reg = <0x00 0x9e800000 0x00 0x01800000>; /* for OP-TEE */
> +			alignment = <0x1000>;
> +			no-map;
> +		};
> +
> +		wkup_r5fss0_core0_dma_memory_region: r5f-dma-memory@...00000 {
> +			compatible = "shared-dma-pool";
> +			reg = <0x00 0xa0000000 0x00 0x200000>;
> +			no-map;
> +		};
> +	};
> +
> +	vmain_pd: fixed-regulator-vmain-pd {
> +		/* TPS65988 PD CONTROLLER OUTPUT */
> +		compatible = "regulator-fixed";
> +		regulator-name = "vmain_pd";
> +		regulator-min-microvolt = <5000000>;
> +		regulator-max-microvolt = <5000000>;
> +		regulator-always-on;
> +		regulator-boot-on;
> +	};
> +
> +	vcc_5v0: fixedregulator-vcc5v0 {
> +		/* Output of LM34936 */
> +		compatible = "regulator-fixed";
> +		regulator-name = "vcc_5v0";
> +		regulator-min-microvolt = <5000000>;
> +		regulator-max-microvolt = <5000000>;
> +		vin-supply = <&vmain_pd>;
> +		regulator-always-on;
> +		regulator-boot-on;
> +	};
> +
> +	vcc_3v3_sys: fixedregulator-vcc-3v3-sys {

Generic node names (as in DT spec), so regulator-[0-9]. The label and
regulator-name property describe it's user-friendly purpose.

> +		/* output of LM61460-Q1 */
> +		compatible = "regulator-fixed";
> +		regulator-name = "vcc_3v3_sys";
> +		regulator-min-microvolt = <3300000>;
> +		regulator-max-microvolt = <3300000>;
> +		vin-supply = <&vmain_pd>;
> +		regulator-always-on;
> +		regulator-boot-on;
> +	};
> +
> +	leds {
> +		compatible = "gpio-leds";
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&usr_led_pins_default>;
> +
> +		led-0 {

Best regards,
Krzysztof