Re: [PATCH v6 1/2] arm64: dts: Add support for Spreadtrum SC9836 SoC in dts and Makefile

[Mark Rutland]

On Fri, Jan 23, 2015 at 10:21:30AM +0000, Chunyan Zhang wrote:
> From: Zhizhou Zhang <zhizhou.zhang@xxxxxxxxxxxxxx>
> 
> Adds the device tree support for Spreadtrum SC9836 SoC which is based on
> Sharkl64 platform.
> 
> Sharkl64 platform contains the common nodes of Spreadtrum's arm64-based SoCs.
> 
> Signed-off-by: Zhizhou Zhang <zhizhou.zhang@xxxxxxxxxxxxxx>
> Signed-off-by: Orson Zhai <orson.zhai@xxxxxxxxxxxxxx>
> Signed-off-by: Chunyan Zhang <chunyan.zhang@xxxxxxxxxxxxxx>
> ---
>  arch/arm64/boot/dts/Makefile                  |    1 +
>  arch/arm64/boot/dts/sprd/Makefile             |    5 ++
>  arch/arm64/boot/dts/sprd/sc9836-openphone.dts |   49 ++++++++++++++++
>  arch/arm64/boot/dts/sprd/sc9836.dtsi          |   74 +++++++++++++++++++++++++
>  arch/arm64/boot/dts/sprd/sharkl64.dtsi        |   65 ++++++++++++++++++++++
>  5 files changed, 194 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/sprd/Makefile
>  create mode 100644 arch/arm64/boot/dts/sprd/sc9836-openphone.dts
>  create mode 100644 arch/arm64/boot/dts/sprd/sc9836.dtsi
>  create mode 100644 arch/arm64/boot/dts/sprd/sharkl64.dtsi
> 
> diff --git a/arch/arm64/boot/dts/Makefile b/arch/arm64/boot/dts/Makefile
> index 3b8d427..806a717 100644
> --- a/arch/arm64/boot/dts/Makefile
> +++ b/arch/arm64/boot/dts/Makefile
> @@ -2,6 +2,7 @@ dts-dirs += amd
>  dts-dirs += apm
>  dts-dirs += arm
>  dts-dirs += cavium
> +dts-dirs += sprd
>  
>  always		:= $(dtb-y)
>  subdir-y	:= $(dts-dirs)
> diff --git a/arch/arm64/boot/dts/sprd/Makefile b/arch/arm64/boot/dts/sprd/Makefile
> new file mode 100644
> index 0000000..b658c5e
> --- /dev/null
> +++ b/arch/arm64/boot/dts/sprd/Makefile
> @@ -0,0 +1,5 @@
> +dtb-$(CONFIG_ARCH_SPRD) += sc9836-openphone.dtb
> +
> +always		:= $(dtb-y)
> +subdir-y	:= $(dts-dirs)
> +clean-files	:= *.dtb
> diff --git a/arch/arm64/boot/dts/sprd/sc9836-openphone.dts b/arch/arm64/boot/dts/sprd/sc9836-openphone.dts
> new file mode 100644
> index 0000000..b8a69b2
> --- /dev/null
> +++ b/arch/arm64/boot/dts/sprd/sc9836-openphone.dts
> @@ -0,0 +1,49 @@
> +/*
> + * Spreadtrum SC9836 openphone board DTS file
> + *
> + * Copyright (C) 2014, Spreadtrum Communications Inc.
> + *
> + * This file is licensed under a dual GPLv2 or X11 license.
> + */
> +
> +/dts-v1/;
> +
> +#include "sc9836.dtsi"
> +
> +/ {
> +	model = "Spreadtrum SC9836 Openphone Board";
> +
> +	compatible = "sprd,sc9836-openphone", "sprd,sc9836";
> +
> +	aliases {
> +		serial0 = &uart0;
> +		serial1 = &uart1;
> +		serial2 = &uart2;
> +		serial3 = &uart3;
> +	};
> +
> +	memory@80000000 {
> +		device_type = "memory";
> +		reg = <0 0x80000000 0 0x20000000>;
> +	};
> +
> +	chosen {
> +		stdout-path = &uart0;
> +	};

It would be good to use an explicit configuration here. e.g. have:

	chosen {
		stdout-path = "serial0:115200n8";
	};

Where '115200n8' is replaced by whatever the bootloader leaves the UART
configured as on this board.

That means you won't need a 'console=' to get nice consistent serial
output at boot, and won't be relying on implicit defaults all over the
place.

> +};
> +
> +&uart0 {
> +	status = "okay";
> +};
> +
> +&uart1 {
> +	status = "okay";
> +};
> +
> +&uart2 {
> +	status = "okay";
> +};
> +
> +&uart3 {
> +	status = "okay";
> +};
> diff --git a/arch/arm64/boot/dts/sprd/sc9836.dtsi b/arch/arm64/boot/dts/sprd/sc9836.dtsi
> new file mode 100644
> index 0000000..c646123
> --- /dev/null
> +++ b/arch/arm64/boot/dts/sprd/sc9836.dtsi
> @@ -0,0 +1,74 @@
> +/*
> + * Spreadtrum SC9836 SoC DTS file
> + *
> + * Copyright (C) 2014, Spreadtrum Communications Inc.
> + *
> + * This file is licensed under a dual GPLv2 or X11 license.
> + */
> +
> +#include "sharkl64.dtsi"
> +#include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> +/ {
> +	compatible = "sprd,sc9836";
> +
> +	cpus {
> +		#address-cells = <2>;
> +		#size-cells = <0>;
> +
> +		cpu@0 {
> +			device_type = "cpu";
> +			compatible = "arm,cortex-a53", "arm,armv8";
> +			reg = <0x0 0x0>;
> +			enable-method = "psci";
> +		};
> +
> +		cpu@1 {
> +			device_type = "cpu";
> +			compatible = "arm,cortex-a53", "arm,armv8";
> +			reg = <0x0 0x1>;
> +			enable-method = "psci";
> +		};
> +
> +		cpu@2 {
> +			device_type = "cpu";
> +			compatible = "arm,cortex-a53", "arm,armv8";
> +			reg = <0x0 0x2>;
> +			enable-method = "psci";
> +		};
> +
> +		cpu@3 {
> +			device_type = "cpu";
> +			compatible = "arm,cortex-a53", "arm,armv8";
> +			reg = <0x0 0x3>;
> +			enable-method = "psci";
> +		};
> +	};
> +
> +	gic: interrupt-controller@12001000 {
> +		compatible = "arm,gic-400";
> +		reg = <0 0x12001000 0 0x1000>,
> +		      <0 0x12002000 0 0x2000>,
> +		      <0 0x12004000 0 0x2000>,
> +		      <0 0x12006000 0 0x2000>;
> +		#interrupt-cells = <3>;
> +		interrupt-controller;
> +		interrupts = <GIC_PPI 9 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_HIGH)>;
> +	};
> +
> +	psci {
> +		compatible	= "arm,psci";
> +		method		= "smc";
> +		cpu_on		= <0xc4000003>;
> +		cpu_off		= <0x84000002>;
> +		cpu_suspend	= <0xc4000001>;
> +	};

Given that there are no suspend states in this dts, the cpu_suspend
property here could be omitted for now (though I guess it doesn't matter
either way).

> +
> +	timer {
> +		compatible = "arm,armv8-timer";
> +		interrupts = <GIC_PPI 13 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
> +			     <GIC_PPI 14 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
> +			     <GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
> +			     <GIC_PPI 10 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>;
> +	};
> +};
> diff --git a/arch/arm64/boot/dts/sprd/sharkl64.dtsi b/arch/arm64/boot/dts/sprd/sharkl64.dtsi
> new file mode 100644
> index 0000000..6b4bdc5
> --- /dev/null
> +++ b/arch/arm64/boot/dts/sprd/sharkl64.dtsi
> @@ -0,0 +1,65 @@
> +/*
> + * Spreadtrum Sharkl64 platform DTS file
> + *
> + * Copyright (C) 2014, Spreadtrum Communications Inc.
> + *
> + * This file is licensed under a dual GPLv2 or X11 license.
> + */
> +
> +/ {
> +	interrupt-parent = <&gic>;
> +	#address-cells = <2>;
> +	#size-cells = <2>;
> +
> +	soc {
> +		compatible = "simple-bus";
> +		#address-cells = <2>;
> +		#size-cells = <2>;
> +		ranges;
> +
> +		ap-apb {
> +			compatible = "simple-bus";
> +			#address-cells = <2>;
> +			#size-cells = <2>;
> +			ranges;
> +
> +			uart0: serial@70000000 {
> +				compatible = "sprd,sc9836-uart";
> +				reg = <0 0x70000000 0 0x100>;
> +				interrupts = <0 2 0xf04>;
> +				clocks = <&clk26mhz>;
> +				status = "disabled";
> +			};
> +
> +			uart1: serial@70100000 {
> +				compatible = "sprd,sc9836-uart";
> +				reg = <0 0x70100000 0 0x100>;
> +				interrupts = <0 3 0xf04>;
> +				clocks = <&clk26mhz>;
> +				status = "disabled";
> +			};
> +
> +			uart2: serial@70200000 {
> +				compatible = "sprd,sc9836-uart";
> +				reg = <0 0x70200000 0 0x100>;
> +				interrupts = <0 2 0xf04>;
> +				clocks = <&clk26mhz>;
> +				status = "disabled";
> +			};
> +
> +			uart3: serial@70300000 {
> +				compatible = "sprd,sc9836-uart";
> +				reg = <0 0x70300000 0 0x100>;
> +				interrupts = <0 3 0xf04>;
> +				clocks = <&clk26mhz>;
> +				status = "disabled";
> +			};
> +		};
> +	};
> +
> +	clk26mhz: clk26mhz {
> +		compatible = "fixed-clock";
> +		#clock-cells = <0>;
> +		clock-frequency = <26000000>;
> +	};
> +};

Other than my comments above, this looks fine to me. I assume the UART
binding and driver are already queued somewhere else?

If so:

Acked-by: Mark Rutland <mark.rutland@xxxxxxx>

Thanks,
Mark.
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