linux-kernel - Re: [PATCH 5/5] ARC: DTS: Add device-tree for Anarion-based development board

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Date:   Mon, 31 Jul 2017 12:02:58 +0530
From:   Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:     Alexandru Gagniuc <alex.g@...ptrum.com>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 5/5] ARC: DTS: Add device-tree for Anarion-based
 development board

On 07/29/2017 03:37 AM, Alexandru Gagniuc wrote:
> Signed-off-by: Alexandru Gagniuc <alex.g@...ptrum.com>
> ---
>   arch/arc/boot/dts/adaptrum_anarion.dtsi     | 107 ++++++++++++++++++++++++++++
>   arch/arc/boot/dts/adaptrum_anarion_fpga.dts |  49 +++++++++++++
>   2 files changed, 156 insertions(+)
>   create mode 100644 arch/arc/boot/dts/adaptrum_anarion.dtsi
>   create mode 100644 arch/arc/boot/dts/adaptrum_anarion_fpga.dts

So you really need to upstream the fpga dts - if this just for initial bringup and 
you will eventually switch to silicon.
The reason I say is every additional file is a maintenance burden so better to 
avoid things which are only temporary.
But if you plan to support this config in long run I'm fine !

Looking further it seems first one is a "common" include style dts while fpga is 
for actual platform and the SoC one will follow once you get it running ?

>
> diff --git a/arch/arc/boot/dts/adaptrum_anarion.dtsi b/arch/arc/boot/dts/adaptrum_anarion.dtsi
> new file mode 100644
> index 0000000..f50958f
> --- /dev/null
> +++ b/arch/arc/boot/dts/adaptrum_anarion.dtsi
> @@ -0,0 +1,107 @@
> +/*
> + * (C) Copyright 2017 Adaptrum, Inc.
> + * Written by Alexandru Gagniuc <alex.g@...ptrum.com> for Adaptrum, Inc.
> + * Licensed under the GPLv2 or (at your option) any later version
> + */
> +
> +#include "skeleton.dtsi"

Perhaps put a one liner that this is based on SNPS ARC700 cpu !

> +
> +/ {
> +	compatible = "adaptrum,anarion";
> +	#address-cells = <1>;
> +	#size-cells = <1>;
> +
> +	soc {
> +		compatible = "simple-bus";
> +		device_type = "soc";
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		ranges;
> +		interrupt-parent = <&core_intc>;
> +
> +		core_intc: interrupt-controller {
> +			compatible = "snps,arc700-intc";
> +			interrupt-controller;
> +			#interrupt-cells = <1>;
> +		};
> +
> +		uart0: serial@...02100 {
> +			compatible = "ns16550";
> +			reg = <0xf2202100 0x20>;
> +			interrupts = <8>;
> +			reg-shift = <2>;
> +			reg-io-width = <4>;
> +			clock-frequency = <192000000>;
> +			status = "disabled";
> +		};
> +
> +		uart1: serial@...02200 {
> +			compatible = "snps,dw-apb-uart";
> +			reg = <0xf2202200 0x20>;
> +			interrupts = <8>;
> +			reg-shift = <2>;
> +			reg-io-width = <4>;
> +			clock-frequency = <192000000>;
> +			status = "disabled";
> +		};
> +
> +		uart2: serial@...02300 {
> +			compatible = "snps,dw-apb-uart";
> +			reg = <0xf2202300 0x20>;
> +			interrupts = <8>;
> +			reg-shift = <2>;
> +			reg-io-width = <4>;
> +			clock-frequency = <192000000>;
> +			status = "disabled";
> +		};
> +
> +		uart3: serial@...02400 {
> +			compatible = "snps,dw-apb-uart";
> +			reg = <0xf2202400 0x20>;
> +			interrupts = <8>;
> +			reg-shift = <2>;
> +			reg-io-width = <4>;
> +			clock-frequency = <192000000>;
> +			status = "disabled";
> +		};
> +
> +		qspi: qspi@...0f000 {
> +			compatible = "adaptrum,anarion-qspi";
> +			reg = <0xf200f000 0x1000>,
> +			      <0x20000000 0x08000000>;
> +
> +			interrupts = <10>;
> +			status = "disabled";
> +		};
> +
> +		gmac0: ethernet@...10000 {
> +			compatible = "snps,dwmac";
> +			reg = <0xf2010000 0x4000>;
> +
> +			interrupt-parent = <&core_intc>;
> +			interrupts = <20>;
> +			interrupt-names = "macirq";
> +
> +			clocks = <&core_clk>;
> +			clock-names = "stmmaceth";
> +
> +			snps,pbl = <32>;
> +			status = "disabled";
> +		};
> +
> +		gmac1: ethernet@...14000 {
> +			compatible = "adaptrum,anarion-gmac", "snps,dwmac";
> +			reg = <0xf2014000 0x4000>, <0xf2018100 8>;
> +
> +			interrupt-parent = <&core_intc>;
> +			interrupts = <21>;
> +			interrupt-names = "macirq";
> +
> +			clocks = <&core_clk>;
> +			clock-names = "stmmaceth";
> +
> +			snps,pbl = <32>;
> +			status = "disabled";
> +		};
> +	};
> +};
> diff --git a/arch/arc/boot/dts/adaptrum_anarion_fpga.dts b/arch/arc/boot/dts/adaptrum_anarion_fpga.dts
> new file mode 100644
> index 0000000..36173b2
> --- /dev/null
> +++ b/arch/arc/boot/dts/adaptrum_anarion_fpga.dts
> @@ -0,0 +1,49 @@
> +/*
> + * (C) Copyright 2017 Adaptrum, Inc.
> + * Written by Alexandru Gagniuc <alex.g@...ptrum.com> for Adaptrum, Inc.
> + * Licensed under the GPLv2 or (at your option) any later version
> + */
> +
> +/dts-v1/;
> +
> +#include "adaptrum_anarion.dtsi"
> +
> +/ {
> +	model = "adaptrum,anarion";
> +	compatible = "adaptrum,anarion";
> +
> +	chosen {
> +		bootargs = "earlycon console=ttyS0,115200n8";
> +		stdout-path = "serial0:115200n8";
> +	};
> +
> +	aliases {
> +		serial0 = &uart0;
> +	};
> +
> +	core_clk: core_clk {
> +		#clock-cells = <0>;
> +		compatible = "fixed-clock";
> +		clock-frequency = <12000000>;
> +	};
> +};
> +
> +&uart0 {
> +	status = "okay";
> +};
> +
> +&qspi {
> +	status = "okay";
> +	flash0: w25q128fvn@0 {
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		compatible = "winbond,w25q128", "jedec,spi-nor";
> +		spi-max-frequency = <70000000>;
> +		m25p,fast-read;
> +	};
> +};
> +
> +&gmac1 {
> +	phy-mode = "rgmii";
> +	status = "okay";
> +};