linux-kernel - Re: [PATCH 1/2] ARM: dts: ti: Add AM57xx GP EVM board support

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Date:   Sat, 15 Oct 2022 11:21:55 -0400
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Andrew Davis <afd@...com>,
        Benoît Cousson <bcousson@...libre.com>,
        Tony Lindgren <tony@...mide.com>, Nishanth Menon <nm@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-omap@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] ARM: dts: ti: Add AM57xx GP EVM board support

On 14/10/2022 11:26, Andrew Davis wrote:
> The AM57xx GP EVM boards are built on top the AM57xx BeagleBoard-X15.
> The EVM extends the BeagleBoard by adding a touchscreen, some buttons,
> and a handful of peripheral extension slots.
> 
> Being a plugin extension of an existing standalone board; we define
> the am57xx-evm as a composite-DTB of the base am57xx-beagle-x15
> and a new am57xx-evm overlay.
> 
> Signed-off-by: Tero Kristo <t-kristo@...com>
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...com>
> Signed-off-by: Suman Anna <s-anna@...com>
> Signed-off-by: Andrew Davis <afd@...com>
> ---
>  arch/arm/boot/dts/Makefile        |   2 +
>  arch/arm/boot/dts/am57xx-evm.dtso | 127 ++++++++++++++++++++++++++++++
>  2 files changed, 129 insertions(+)
>  create mode 100644 arch/arm/boot/dts/am57xx-evm.dtso
> 
> diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
> index 6aa7dc4db2fc..767220502021 100644
> --- a/arch/arm/boot/dts/Makefile
> +++ b/arch/arm/boot/dts/Makefile
> @@ -984,10 +984,12 @@ dtb-$(CONFIG_SOC_OMAP5) += \
>  	omap5-igep0050.dtb \
>  	omap5-sbc-t54.dtb \
>  	omap5-uevm.dtb
> +am57xx-evm-dtbs := am57xx-beagle-x15.dtb am57xx-evm.dtbo
>  dtb-$(CONFIG_SOC_DRA7XX) += \
>  	am57xx-beagle-x15.dtb \
>  	am57xx-beagle-x15-revb1.dtb \
>  	am57xx-beagle-x15-revc.dtb \
> +	am57xx-evm.dtb \
>  	am5729-beagleboneai.dtb \
>  	am57xx-cl-som-am57x.dtb \
>  	am57xx-sbc-am57x.dtb \
> diff --git a/arch/arm/boot/dts/am57xx-evm.dtso b/arch/arm/boot/dts/am57xx-evm.dtso
> new file mode 100644
> index 000000000000..6678aaef66ee
> --- /dev/null
> +++ b/arch/arm/boot/dts/am57xx-evm.dtso
> @@ -0,0 +1,127 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * DT overlay for AM57xx GP EVM boards
> + *
> + * Copyright (C) 2020-2022 Texas Instruments Incorporated - https://www.ti.com/
> + */
> +
> +/dts-v1/;
> +/plugin/;
> +
> +#include <dt-bindings/interrupt-controller/irq.h>
> +#include <dt-bindings/gpio/gpio.h>
> +#include <dt-bindings/input/input.h>
> +
> +&{/} {
> +	compatible = "ti,am5728-evm", "ti,am572x-beagle-x15", "ti,am5728", "ti,dra742", "ti,dra74", "ti,dra7";

You should start documenting these...

> +	model = "TI AM5728 EVM";
> +
> +	aliases {
> +		display0 = "/display";
> +		display1 = "/connector"; // Fixme: &lcd0 and &hdmi0 could be
> +					 // resolved here correcly based on
> +					 // information in the base dtb symbol
> +					 // table with a fix in dtc
> +	};
> +
> +	gpio-keys {
> +		compatible = "gpio-keys";
> +
> +		button-user1 {
> +			gpios = <&gpio2 23 GPIO_ACTIVE_LOW>;
> +			label = "USER1";
> +			linux,code = <BTN_1>;
> +		};
> +
> +		button-user2 {
> +			gpios = <&gpio2 25 GPIO_ACTIVE_LOW>;
> +			label = "USER2";
> +			linux,code = <BTN_2>;
> +		};
> +
> +		button-user3 {
> +			gpios = <&gpio2 28 GPIO_ACTIVE_LOW>;
> +			label = "USER3";
> +			linux,code = <BTN_3>;
> +		};
> +
> +		button-user4 {
> +			gpios = <&gpio2 24 GPIO_ACTIVE_LOW>;
> +			label = "USER4";
> +			linux,code = <BTN_4>;
> +		};
> +
> +		button-user5 {
> +			gpios = <&gpio2 20 GPIO_ACTIVE_LOW>;
> +			label = "USER5";
> +			linux,code = <BTN_5>;
> +		};
> +	};
> +
> +	lcd0: display {
> +		compatible = "osddisplays,osd070t1718-19ts", "panel-dpi";
> +		backlight = <&lcd_bl>;
> +		enable-gpios = <&gpio2 5 GPIO_ACTIVE_HIGH>;
> +		label = "lcd";
> +
> +		port {
> +			lcd_in: endpoint {
> +				remote-endpoint = <&dpi_out>;
> +			};
> +		};
> +	};
> +
> +	lcd_bl: backlight {
> +		compatible = "pwm-backlight";
> +		brightness-levels = <0 243 245 247 249 251 252 253 255>;
> +		default-brightness-level = <8>;
> +		pwms = <&ehrpwm1 0 50000 0>;

Don't you have here PWM flag?

> +	};
> +};
> +
> +&ehrpwm1 {
> +	status = "okay";
> +};
> +
> +&epwmss1 {
> +	status = "okay";
> +};
> +
> +&i2c5 {
> +	status = "okay";
> +	clock-frequency = <400000>;
> +
> +	#address-cells = <1>;
> +	#size-cells = <0>;
> +
> +	pixcir_ts@5c {

No underscores in node names.

Node names should be generic.
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation

> +		compatible = "pixcir,pixcir_tangoc";
> +		attb-gpio = <&gpio2 4 GPIO_ACTIVE_HIGH>;
> +		interrupt-parent = <&gpio2>;
> +		interrupts = <4 0>;

Use proper flags (and not NONE).

> +		reg = <0x5c>;
> +		reset-gpio = <&gpio2 6 GPIO_ACTIVE_HIGH>;
> +		touchscreen-size-x = <1024>;
> +		touchscreen-size-y = <600>;
Best regards,
Krzysztof