Re: [PATCH v3 4/4] ARM: dts: Add initial device tree support for EXYNOS5410

[Tomasz Figa <tomasz.figa@gmail.com>]

Hi,

Please see my comments inline.

On Thursday 07 of November 2013 12:12:49 Vyacheslav Tyrtov wrote:
> From: Tarek Dakhran <t.dakhran@samsung.com>
> 
> Add initial device tree nodes for EXYNOS5410 SoC and SMDK5410 board.
> 
> Signed-off-by: Tarek Dakhran <t.dakhran@samsung.com>
> Signed-off-by: Vyacheslav Tyrtov <v.tyrtov@samsung.com>
> ---
>  arch/arm/boot/dts/Makefile                |   1 +
>  arch/arm/boot/dts/exynos5410-smdk5410.dts |  65 ++++++++++
>  arch/arm/boot/dts/exynos5410.dtsi         | 209 ++++++++++++++++++++++++++++++
>  3 files changed, 275 insertions(+)
>  create mode 100644 arch/arm/boot/dts/exynos5410-smdk5410.dts
>  create mode 100644 arch/arm/boot/dts/exynos5410.dtsi
[snip]
> diff --git a/arch/arm/boot/dts/exynos5410-smdk5410.dts b/arch/arm/boot/dts/exynos5410-smdk5410.dts
> new file mode 100644
> index 0000000..06ae479
> --- /dev/null
> +++ b/arch/arm/boot/dts/exynos5410-smdk5410.dts
> @@ -0,0 +1,65 @@
> +/*
> + * SAMSUNG SMDK5410 board device tree source
> + *
> + * Copyright (c) 2013 Samsung Electronics Co., Ltd.
> + *		http://www.samsung.com
> + *
> + * 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 "exynos5410.dtsi"
> +/ {
> +	model = "Samsung SMDK5410 board based on EXYNOS5410";
> +	compatible = "samsung,smdk5410", "samsung,exynos5410";
> +
> +	memory {
> +		reg = <0x40000000 0x80000000>;
> +	};
> +
> +	chosen {
> +		bootargs = "console=ttySAC2,115200";
> +	};
> +
> +	oscclk: oscclk {

coding style: According to ePAPR recommendation, node name should
represent hardware type, not particular instance of hardware.

So instead, the preferred way would be to specify the clock using
following layout:

	clocks {
		compatible = "simple-bus";
		#address-cells = <1>;
		#size-cells = <0>;

		oscclk: clock@0 {
			compatible = "fixed-clock";
			reg = <0>;
			#clock-cells = <0>;
			clock-frequency = <24000000>;
			clock-output-names = "fin_pll";
		};
	};

> +		compatible = "fixed-clock";
> +		#clock-cells = <0>;
> +		clock-frequency = <24000000>;
> +		clock-output-names = "fin_pll";
> +	};
[snip]
> +
> +};
> diff --git a/arch/arm/boot/dts/exynos5410.dtsi b/arch/arm/boot/dts/exynos5410.dtsi
> new file mode 100644
> index 0000000..9921b66
> --- /dev/null
> +++ b/arch/arm/boot/dts/exynos5410.dtsi
> @@ -0,0 +1,209 @@
> +/*
> + * SAMSUNG EXYNOS5410 SoC device tree source
> + *
> + * Copyright (c) 2013 Samsung Electronics Co., Ltd.
> + *		http://www.samsung.com
> + *
> + * SAMSUNG EXYNOS5410 SoC device nodes are listed in this file.
> + * EXYNOS5410 based board files can include this file and provide
> + * values for board specfic bindings.
> + *
> + * 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.
> + */
> +
> +#include <dt-bindings/clock/exynos5410.h>
> +#include "exynos5.dtsi"
> +/ {
[snip]
> +	clock: clock-controller@10010000 {
> +		compatible = "samsung,exynos5410-clock";
> +		reg = <0x10010000 0x30000>;
> +		#clock-cells = <1>;
> +	};
> +
> +	mct@101C0000 {

A generic name would be: timer@101C0000

> +		compatible = "samsung,exynos4210-mct";
> +		reg = <0x101C0000 0xB00>;
> +		interrupt-controller;
> +		#interrups-cells = <1>;

MCT is not an interrupt controller, so both interrupt-controller and
#interrupt-cells properties are incorrect. I guess that's due to the
broken example in the documentation, that I already posted patches to fix.

> +		interrupt-parent = <&mct_map>;
> +		interrupts = <0>, <1>, <2>, <3>,
> +			<4>, <5>, <6>, <7>,
> +			<8>, <9>, <10>, <11>;
> +		clocks = <&oscclk>, <&clock CLK_MCT>;
> +		clock-names = "fin_pll", "mct";
> +
> +		mct_map: mct-map {

Again, interrupt-map would be a better name for this node.

> +			#interrupt-cells = <1>;
> +			#address-cells = <0>;
> +			#size-cells = <0>;
> +			interrupt-map = <0 &combiner 23 3>,
> +					<1 &combiner 23 4>,
> +					<2 &combiner 25 2>,
> +					<3 &combiner 25 3>,
> +					<4 &gic 0 120 0>,
> +					<5 &gic 0 121 0>,
> +					<6 &gic 0 122 0>,
> +					<7 &gic 0 123 0>,
> +					<8 &gic 0 128 0>,
> +					<9 &gic 0 129 0>,
> +					<10 &gic 0 130 0>,
> +					<11 &gic 0 131 0>;
> +		};
> +	};

Otherwise, the patch looks good.

Best regards,
Tomasz