linux-kernel - Re: [PATCH 1/1] ARM: dts: sun8i: Add dts file for the NanoPi NEO SBC

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Date:   Sun, 4 Sep 2016 22:13:22 +0200
From:   Rask Ingemann Lambertsen <ccc94453@....cybercity.dk>
To:     james@...ovum.com.au
Cc:     maxime.ripard@...eelectrons.com, robh+dt@...nel.com,
        mark.rutland@....com, linux@...linux.org.uk, wens@...e.org,
        devicetree@...r.kernel.org, linux-sunxi@...glegroups.com,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/1] ARM: dts: sun8i: Add dts file for the NanoPi NEO SBC

On Thu, Sep 01, 2016 at 01:48:54PM +1000, james@...ovum.com.au wrote:

> +#include <dt-bindings/input/input.h>

You don't seem to use anything from that header file.

> +#include <dt-bindings/pinctrl/sun4i-a10.h>
> +
> +/ {
> +	model = "FriendlyARM NanoPi NEO";
> +	compatible = "friendlyarm,nanopi-neo", "allwinner,sun8i-h3";

It is good practice to add new vendor prefixes to the list in
Documentation/devicetree/bindings/vendor-prefixes.txt (sorted alphabetially
by vendor prefix).

> +	leds {
> +		compatible = "gpio-leds";
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&leds_opc>, <&leds_r_opc>;
> +
> +		pwr_led {
> +			label = "nanopi:green:pwr";
> +			gpios = <&r_pio 0 10 GPIO_ACTIVE_HIGH>;
> +			default-state = "on";
> +		};
> +
> +		status_led {
> +			label = "nanopi:blue:status";
> +			gpios = <&pio 0 10 GPIO_ACTIVE_HIGH>;
> +		};
> +	};

Node names should not have underscores in them. [1][2]
IMHO the _led suffix is unnecessary inside leds { }.
I think you should add a comment with the name of the GPIO pin like you
did with &mmc0/cd-gpios.

> +&pio {
> +	leds_opc: led_pins@0 {
> +		allwinner,pins = "PA10";
> +		allwinner,function = "gpio_out";
> +		allwinner,drive = <SUN4I_PINCTRL_10_MA>;
> +		allwinner,pull = <SUN4I_PINCTRL_NO_PULL>;
> +	};
> +};

Use hyphens instead of underscores in node names. Also, unit addresses and
reg properties go together. Either you have both or you have neither. So
drop the @0 part of the node name. You'll get warnings about this sort of
mismatch when your device tree is compiled as part of Das U-Boot.

> +&r_pio {
> +	leds_r_opc: led_pins@0 {

Likewise.

[1] https://www.mail-archive.com/linux-kernel%40vger.kernel.org/msg1122967.html
[2] https://www.mail-archive.com/linux-kernel%40vger.kernel.org/msg1145633.html

-- 
Rask Ingemann Lambertsen