Re: [PATCH 11/14] arm64: dts: Add initial device tree support for EXYNOS7

[Tomasz Figa <t.figa@samsung.com>]

Hi Naveen,

Please see my comments inline.

On 27.08.2014 11:44, Naveen Krishna Chatradhi wrote:
> Add initial device tree nodes for EXYNOS7 SoC.
> Also, includes the dt-binding definitions for clock ids.
> 
> Signed-off-by: Naveen Krishna Chatradhi <ch.naveen@samsung.com>
> Cc: Thomas Abraham <thomas.ab@samsung.com>
> Cc: Rob Herring <robh@kernel.org>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> ---
>  arch/arm64/boot/dts/exynos7.dtsi |  553 ++++++++++++++++++++++++++++++++++++++
>  1 file changed, 553 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/exynos7.dtsi
> 
> diff --git a/arch/arm64/boot/dts/exynos7.dtsi b/arch/arm64/boot/dts/exynos7.dtsi
> new file mode 100644
> index 0000000..6b9eaf4
> --- /dev/null
> +++ b/arch/arm64/boot/dts/exynos7.dtsi
> @@ -0,0 +1,553 @@
> +/*
> + * SAMSUNG EXYNOS7 SoC device tree source
> + *
> + * Copyright (c) 2014 Samsung Electronics Co., Ltd.
> + *		http://www.samsung.com
> + *
> + * SAMSUNG EXYNOS7 SoC device nodes are listed in this file.
> + * EXYNOS7 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/exynos7-clk.h>
> +
> +/ {
> +	compatible = "samsung,exynos7";
> +	interrupt-parent = <&gic>;
> +	#address-cells = <1>;
> +	#size-cells = <1>;
> +
> +	aliases {
> +		pinctrl0 = &pinctrl_0;
> +		pinctrl1 = &pinctrl_1;
> +		pinctrl2 = &pinctrl_2;
> +		pinctrl3 = &pinctrl_3;
> +		pinctrl4 = &pinctrl_4;
> +		pinctrl5 = &pinctrl_5;
> +		pinctrl6 = &pinctrl_6;
> +		pinctrl7 = &pinctrl_7;
> +		pinctrl8 = &pinctrl_8;
> +		pinctrl9 = &pinctrl_9;
> +		mshc0 = &mmc_0;
> +		mshc2 = &mmc_2;

Please add aliases for serial controllers. Refer to relevant DT binding
documentation for more information.

> +	};
> +
> +	chipid@10000000 {
> +		compatible = "samsung,exynos4210-chipid";
> +		reg = <0x10000000 0x100>;
> +	};

Please put SoC components (except cpus node) under a simple-bus node
called "soc". Please see exynos5260.dtsi as an example.

> +
> +	cpus {
> +		#address-cells = <2>;
> +		#size-cells = <0>;
> +
> +		cpu@0 {
> +			device_type = "cpu";
> +			compatible = "arm,cortex-a57", "arm,armv8";
> +			reg = <0x0 0x0>;
> +		};

Does this SoC really has only one CPU or this is a workaround for things
like missing CPU bring-up code?

> +	};

[snip]

> +	mct@101C0000 {
> +		compatible = "samsung,exynos4210-mct";
> +		reg = <0x101C0000 0x800>;
> +		interrupt-controller;
> +		#interrupt-cells = <1>;

MCT is not an interrupt controller.

> +		interrupt-parent = <&mct_map>;
> +		interrupts =	<0>, <1>, <2>, <3>,
> +				<4>, <5>, <6>, <7>,
> +				<8>, <9>, <10>, <11>;
> +		clocks = <&fin_pll>, <&clock_peris PCLK_MCT>;
> +		clock-names = "fin_pll", "mct";
> +
> +		mct_map: mct-map {
> +			#interrupt-cells = <1>;
> +			#address-cells = <0>;
> +			#size-cells = <0>;
> +			interrupt-map = <0 &gic 0 112 0>,
> +					<1 &gic 0 113 0>,
> +					<2 &gic 0 114 0>,
> +					<3 &gic 0 115 0>,
> +					<4 &gic 0 116 0>,
> +					<5 &gic 0 117 0>,
> +					<6 &gic 0 118 0>,
> +					<7 &gic 0 119 0>,
> +					<8 &gic 0 120 0>,
> +					<9 &gic 0 121 0>,
> +					<10 &gic 0 122 0>,
> +					<11 &gic 0 123 0>;

All inputs of this interrupt map come from the same interrupt
controller. What's the point of this map then?

> +		};
> +	};
> +
> +	mmc_0: mmc@15740000 {
> +		compatible = "samsung,exynos7-dw-mshc-smu";
> +		interrupts = <0 201 0>;
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +		reg = <0x15740000 0x2000>;
> +		clocks = <&clock_fsys1 ACLK_MMC0>,
> +			<&clock_top1 CLK_SCLK_MMC0>;
> +		clock-names = "biu", "ciu";
> +		fifo-depth = <0x40>;
> +		status = "disabled";
> +	};
> +
> +	mmc_2: mmc@15560000 {
> +		compatible = "samsung,exynos7-dw-mshc-smu";
> +		interrupts = <0 216 0>;
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +		reg = <0x15560000 0x2000>;
> +		clocks = <&clock_fsys0 ACLK_MMC2>,
> +			<&clock_top1 CLK_SCLK_MMC2>;
> +		clock-names = "biu", "ciu";
> +		fifo-depth = <0x40>;
> +		status = "disabled";
> +	};
> +
> +	pinctrl_0: pinctrl@10580000 {
> +		compatible = "samsung,exynos7-pinctrl";
> +		reg = <0x10580000 0x1000>;
> +		interrupts = <0 0 0>, <0 1 0>, <0 2 0>, <0 3 0>,
> +				<0 4 0>, <0 5 0>, <0 6 0>, <0 7 0>,
> +				<0 8 0>, <0 9 0>, <0 10 0>, <0 11 0>,
> +				<0 12 0>, <0 13 0>, <0 14 0>, <0 15 0>;

According to patch 5/14, this bank supports only wake-up interrupts.
Their interrupt specifiers should be specified either in the wake-up
interrupt controller node (for muxed wake-up interrupts) or in nodes of
respective banks (for direct wake-up interrupts).

> +		wakeup-interrupt-controller {
> +			compatible = "samsung,exynos4210-wakeup-eint";
> +			interrupt-parent = <&gic>;
> +			interrupts = <0 16 0>;
> +		};
> +	};

[snip]

> +	serial@13630000 {
> +		compatible = "samsung,exynos4210-uart";
> +		reg = <0x13630000 0x100>;
> +		interrupts = <0 440 0>;
> +		clocks = <&clock_peric0 PCLK_UART0>, <&clock_peric0 SCLK_UART0>;
> +		clock-names = "uart", "clk_uart_baud0";
> +		status = "okay";

No need to explicitly specify the status as "okay" in top level dtsi file.

> +	};
> +
> +	serial@14C20000 {
> +		compatible = "samsung,exynos4210-uart";
> +		reg = <0x14C20000 0x100>;
> +		interrupts = <0 456 0>;
> +		clocks = <&clock_peric1 PCLK_UART1>, <&clock_peric1 SCLK_UART1>;
> +		clock-names = "uart", "clk_uart_baud1";

The "clk_uart_baud1" clock doesn't seem right. The N in "clk_uart_baudN"
stands for the input of internal clock source mux, not index of the IP
block in the SoC. Please make sure this is defined correctly.

> +		status = "okay";

Ditto.

> +	};
> +
> +	serial@14C30000 {
> +		compatible = "samsung,exynos4210-uart";
> +		reg = <0x14C30000 0x100>;
> +		interrupts = <0 457 0>;
> +		clocks = <&clock_peric1 PCLK_UART2>, <&clock_peric1 SCLK_UART2>;
> +		clock-names = "uart", "clk_uart_baud2";

Ditto.

> +		status = "okay";

Ditto.

> +	};
> +
> +	serial@14C40000 {
> +		compatible = "samsung,exynos4210-uart";
> +		reg = <0x14C40000 0x100>;
> +		interrupts = <0 458 0>;
> +		clocks = <&clock_peric1 PCLK_UART3>, <&clock_peric1 SCLK_UART3>;
> +		clock-names = "uart", "clk_uart_baud3";

Ditto.

> +		status = "okay";

Ditto.

Best regards,
Tomasz