linux-kernel - Re: [PATCH 2/2] V3 ARM: mvebu: Added dts defintion for Lenovo Iomega ix4-300d NAS

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Date:	Sun, 27 Jul 2014 22:32:58 +0200
From:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
To:	Benoit Masson <yahoo@...enite.com>
Cc:	benoitm@...enite.com, Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, gregory.clement@...e-electrons.com,
	andrew@...n.ch, sebastian.hesselbarth@...glemail.com,
	jason@...edaemon.net
Subject: Re: [PATCH 2/2] V3 ARM: mvebu: Added dts defintion for Lenovo
 Iomega ix4-300d NAS

Dear Benoit Masson,

On Sat, 26 Jul 2014 16:48:10 -0700, Benoit Masson wrote:

> +	gpio-keys {
> +		compatible = "gpio-keys";
> +		pinctrl-0 = <&power_button_pin &reset_button_pin
> +			&select_button_pin &scroll_button_pin>;
> +		pinctrl-names = "default";
> +
> +		power-button {
> +			label = "Power Button";
> +			linux,code = <KEY_POWER>;
> +			gpios = <&gpio1 12 GPIO_ACTIVE_HIGH>;
> +		};
> +
> +		reset-button {
> +			label = "Reset Button";
> +			linux,code = <KEY_RESTART>;
> +			gpios = <&gpio1 13 GPIO_ACTIVE_LOW>;
> +		};
> +
> +		select-button {
> +			label = "Select Button";
> +			linux,code = <BTN_SELECT>;
> +			gpios = <&gpio1 9 GPIO_ACTIVE_LOW>;
> +		};
> +
> +		scroll-button {
> +			label = "Scroll Button";
> +			linux,code = <KEY_SCROLLDOWN>;
> +			gpios = <&gpio1 10 GPIO_ACTIVE_LOW>;

So you're using the GPIO_ACTIVE_<foo> defines here.

> +		};
> +	};
> +
> +	spi3 {
> +		compatible = "spi-gpio";
> +		status = "okay";
> +		gpio-sck = <&gpio0 25 0>;
> +		gpio-mosi = <&gpio1 15 0>; /*gpio 47*/
> +		cs-gpios = <&gpio0 27 0 >;

But not here. Any reason?

Also, nitpick: unneeded space in <&gpio0 27 0 > (i.e the space right
before the closing >).

> +		num-chipselects = <1>;
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		gpio2: gpio2@0 {
> +			compatible = "fairchild,74hc595";
> +			gpio-controller;
> +			#gpio-cells = <2>;
> +			reg = <0>;
> +			registers-number = <2>;
> +			spi-max-frequency = <100000>;
> +		};

I'm not sure "gpio2" is a good name, as we might think of it as being
the third GPIO controller internal to the SoC.

Thanks,

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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