linux-kernel - Re: [PATCH v2] N900: add device tree

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Date:	Sun, 11 Aug 2013 17:02:42 +0200
From:	Javier Martinez Canillas <martinez.javier@...il.com>
To:	Pavel Machek <pavel@....cz>
Cc:	Aaro Koskinen <aaro.koskinen@....fi>,
	Tony Lindgren <tony@...mide.com>, b-cousson@...com,
	pali.rohar@...il.com, kernel list <linux-kernel@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-omap@...r.kernel.org
Subject: Re: [PATCH v2] N900: add device tree

Hi Pavel,

some minor comments about your patch below

On Sat, Jul 13, 2013 at 2:17 PM, Pavel Machek <pavel@....cz> wrote:
>
> This adds device tree with neccessary support to boot with functional
> video (on both emulator and real N900 device).
>
> Signed-off-by: Pavel Machek <pavel@....cz>
>
> ---
>
> From v1: Aaro wants just GPLv2, so I did that. I re-enabled parts that
> can be enabled on 3.10, and tested it on that kernel.
>
> diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
> index f0895c5..1950aed 100644
> --- a/arch/arm/boot/dts/Makefile
> +++ b/arch/arm/boot/dts/Makefile
> @@ -141,6 +141,7 @@ dtb-$(CONFIG_ARCH_OMAP2PLUS) += omap2420-h4.dtb \
>         omap3-devkit8000.dtb \
>         omap3-beagle-xm.dtb \
>         omap3-evm.dtb \
> +       omap3-n900.dtb \
>         omap3-tobi.dtb \
>         omap3-igep0020.dtb \
>         omap3-igep0030.dtb \
> diff --git a/arch/arm/boot/dts/omap3-n900.dts b/arch/arm/boot/dts/omap3-n900.dts
> new file mode 100644
> index 0000000..fb461bf
> --- /dev/null
> +++ b/arch/arm/boot/dts/omap3-n900.dts
> @@ -0,0 +1,92 @@
> +/*
> + * Copyright (C) 2013 Pavel Machek <pavel@....cz>
> + * Copyright 2013 Aaro Koskinen <aaro.koskinen@....fi>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +/dts-v1/;
> +
> +/include/ "omap34xx.dtsi"
> +

The current trend is to use #include "omap34xx.dtsi" instead /include/
in order to use the C pre-processor and the macros defined in
include/dt-bindings.

> +/ {
> +       model = "Nokia N900";
> +       compatible = "nokia,omap3-n900", "ti,omap3";
> +
> +       cpus {
> +               cpu@0 {
> +                       cpu0-supply = <&vcc>;
> +               };
> +       };
> +
> +       memory {
> +               device_type = "memory";
> +               reg = <0x80000000 0x10000000>; /* 256 MB */
> +       };
> +
> +};
> +
> +&i2c1 {
> +       clock-frequency = <2200000>;
> +
> +       twl: twl@48 {
> +               reg = <0x48>;
> +               interrupts = <7>; /* SYS_NIRQ cascaded to intc */
> +               interrupt-parent = <&intc>;
> +       };
> +};
> +
> +/include/ "twl4030.dtsi"
> +
> +&twl_gpio {
> +       ti,pullups      = <0x0>;
> +       ti,pulldowns    = <0x03ff3f>; /* BIT(0..5) | BIT(8..17) */
> +};
> +
> +&i2c2 {
> +       clock-frequency = <400000>;
> +};
> +
> +&i2c3 {
> +       clock-frequency = <100000>;
> +};
> +
> +&mmc1 {
> +       status = "disabled";
> +};
> +
> +&mmc2 {
> +       status = "disabled";
> +};
> +
> +&mmc3 {
> +       status = "disabled";
> +};
> +
> +&mcspi1 {
> +       // For some reason, touchscreen is neccessary for screen to work at
> +       // all on real hw. It works well without it on emulator.
> +       //
> +       // Also... order in the device tree actually matters here.
> +       tsc2005@0 {
> +               compatible = "tsc2005";
> +               spi-max-frequency = <6000000>;
> +               reg = <0>;
> +       };
> +       mipid@2 {
> +               compatible = "acx565akm";
> +               spi-max-frequency = <6000000>;
> +               reg = <2>;
> +               // turbo_mode = 0,
> +               // cs_per_word = 0
> +       };
> +};

You should remove these properties if they are not being used instead
of keeping them as commented.

> +
> +&usb_otg_hs {
> +       interface-type = <0>;
> +       usb-phy = <&usb2_phy>;
> +       mode = <2>;
> +       power = <50>;
> +};
>
> --

Thanks a lot and best regards,
Javier
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