linux-kernel - Re: [PATCH v6 2/2] ARM: dts: at91: Adding SAMA5D3-EDS board

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Date:   Thu, 8 Sep 2022 13:45:11 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Jerry Ray <jerry.ray@...rochip.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 2/2] ARM: dts: at91: Adding SAMA5D3-EDS board

On 02/09/2022 21:22, Jerry Ray wrote:
> The SAMA5D3-EDS board is an Ethernet Development Platform allowing for
> evaluating many Microchip ethernet switch and PHY products.  Various
> daughter cards can connect up via an RGMII connector or an RMII connector.
> 
> The EDS board is not intended for stand-alone use and has no ethernet
> capabilities when no daughter board is connected.  As such, this device
> tree is intended to be used with a DT overlay defining the add-on board.
> To better ensure consistency, some items are defined here as a form of
> documentation so that all add-on overlays will use the same terms.
> 
> Google search keywords: "Microchip SAMA5D3-EDS"
> 
> Signed-off-by: Jerry Ray <jerry.ray@...rochip.com>
> ---
> v5->v6:
>  - Replaced underscores in names where I can, improving naming.
> v4->v5:
>  - patch now applies to v6.0-rc2
> v3->v4:
>  - Fixed regulators as necessary to get the board to boot from SD Card.
> v2->v3:
>  - Alphabetized pinctrl entries.
>  - cleaned up a warning in the regulators section.
>  - License tweaked to 'OR MIT'
>  - Included Makefile change
> v1->v2:
>  - Modified the compatible field in the device tree to reflect Microchip
>    Ethernet Development System Board.
> ---
>  arch/arm/boot/dts/Makefile             |   1 +
>  arch/arm/boot/dts/at91-sama5d3_eds.dts | 309 +++++++++++++++++++++++++
>  2 files changed, 310 insertions(+)
>  create mode 100644 arch/arm/boot/dts/at91-sama5d3_eds.dts
> 
> diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
> index 05d8aef6e5d2..e92e639a2dc3 100644
> --- a/arch/arm/boot/dts/Makefile
> +++ b/arch/arm/boot/dts/Makefile
> @@ -61,6 +61,7 @@ dtb-$(CONFIG_SOC_SAM_V7) += \
>  	at91-sama5d2_icp.dtb \
>  	at91-sama5d2_ptc_ek.dtb \
>  	at91-sama5d2_xplained.dtb \
> +	at91-sama5d3_eds.dtb \
>  	at91-sama5d3_ksz9477_evb.dtb \
>  	at91-sama5d3_xplained.dtb \
>  	at91-dvk_som60.dtb \
> diff --git a/arch/arm/boot/dts/at91-sama5d3_eds.dts b/arch/arm/boot/dts/at91-sama5d3_eds.dts
> new file mode 100644
> index 000000000000..b4fe1c5f2997
> --- /dev/null
> +++ b/arch/arm/boot/dts/at91-sama5d3_eds.dts
> @@ -0,0 +1,309 @@
> +// SPDX-License-Identifier: GPL-2.0+ OR MIT
> +/*
> + * at91-sama5d3_eds.dts - Device Tree file for the SAMA5D3 Ethernet
> + *    Development System board.
> + *
> + * Copyright (C) 2022 Microchip Technology Inc. and its subsidiaries
> + *
> + * Author: Jerry Ray <jerry.ray@...rochip.com>
> + */
> +/dts-v1/;
> +#include "sama5d36.dtsi"
> +
> +/ {
> +	model = "SAMA5D3 Ethernet Development System";
> +	compatible = "microchip,sama5d3-eds", "atmel,sama5d36",
> +		     "atmel,sama5d3", "atmel,sama5";
> +
> +	chosen {
> +		stdout-path = "serial0:115200n8";
> +	};
> +
> +	clocks {
> +		slow_xtal {

No underscores in node names. Override by label.

> +			clock-frequency = <32768>;
> +		};
> +
> +		main_xtal {
> +			clock-frequency = <12000000>;
> +		};
> +	};
> +
> +	gpio {
> +		compatible = "gpio-keys";
> +
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&pinctrl_key_gpio>;
> +
> +		button-3 {
> +			label = "PB_USER";
> +			gpios = <&pioE 29 GPIO_ACTIVE_LOW>;
> +			linux,code = <0x104>;
> +			wakeup-source;
> +		};
> +	};
> +
> +	memory@...00000 {
> +		reg = <0x20000000 0x10000000>;
> +	};
> +
> +	vcc_3v3_reg: buck-regulator-1 {

Keep consistent prefix or suffix, so:
regulator-buck-1

> +		compatible = "regulator-fixed";
> +		regulator-name = "VCC_3V3";
> +		regulator-min-microvolt = <3300000>;
> +		regulator-max-microvolt = <3300000>;
> +		regulator-always-on;
> +	};
> +
> +	vcc_2v5_reg: ldo-regulator-2 {

regulator-ldo-1
(why numbering of LDO regulators starts from 2? keep some sense in this)


> +		compatible = "regulator-fixed";
> +		regulator-name = "VCC_2V5";
> +		regulator-min-microvolt = <2500000>;
> +		regulator-max-microvolt = <2500000>;
> +		regulator-always-on;
> +		vin-supply = <&vcc_3v3_reg>;
> +	};
> +
> +	vcc_1v8_reg: ldo-regulator-3 {
> +		compatible = "regulator-fixed";
> +		regulator-name = "VCC_1V8";
> +		regulator-min-microvolt = <1800000>;
> +		regulator-max-microvolt = <1800000>;
> +		regulator-always-on;
> +		vin-supply = <&vcc_3v3_reg>;
> +	};
> +
> +	vcc_1v2_reg: buck-regulator-4 {
> +		compatible = "regulator-fixed";
> +		regulator-name = "VCC_1V2";
> +		regulator-min-microvolt = <1200000>;
> +		regulator-max-microvolt = <1200000>;
> +		regulator-always-on;
> +	};
> +
> +	vcc_mmc0_reg: fixedregulator-mmc0 {

Just regulator-mmc0

> +		compatible = "regulator-fixed";
> +		regulator-name = "mmc0-card-supply";
> +		regulator-min-microvolt = <3300000>;
> +		regulator-max-microvolt = <3300000>;
> +		regulator-always-on;
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&pinctrl_vcc_mmc0_reg_gpio>;
> +		gpio = <&pioE 2 GPIO_ACTIVE_LOW>;
> +	};


Best regards,
Krzysztof