linux-kernel - Re: [PATCH v4 1/2] arm64: dts: Add dts files for Marvell Berlin4CT SoC

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Message-ID: <20150730162444.25e4f360@xhacker>
Date:	Thu, 30 Jul 2015 16:24:44 +0800
From:	Jisheng Zhang <jszhang@...vell.com>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
CC:	<catalin.marinas@....com>, <will.deacon@....com>,
	<khilman@...aro.org>, <arnd@...db.de>, <olof@...om.net>,
	<mark.rutland@....com>, <sudeep.holla@....com>,
	<robh+dt@...nel.org>, <galak@...eaurora.org>, <pawel.moll@....com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH v4 1/2] arm64: dts: Add dts files for Marvell Berlin4CT
 SoC

On Thu, 30 Jul 2015 10:06:38 +0200
Sebastian Hesselbarth <sebastian.hesselbarth@...il.com> wrote:

> On 07/22/2015 11:39 AM, Jisheng Zhang wrote:
> > Add initial dtsi file to support Marvell Berlin4CT SoC with
> > quad Cortex-A53 CPUs.
> >
> > It also adds dts file for Marvell Berlin4CT DMP board which is
> > based on Berlin4CT SoC.
> >
> > Signed-off-by: Jisheng Zhang <jszhang@...vell.com>
> > ---
> [...]
> > diff --git a/arch/arm64/boot/dts/marvell/berlin4ct-dmp.dts b/arch/arm64/boot/dts/marvell/berlin4ct-dmp.dts
> > new file mode 100644
> > index 0000000..d1152c0
> > --- /dev/null
> > +++ b/arch/arm64/boot/dts/marvell/berlin4ct-dmp.dts
> > @@ -0,0 +1,66 @@
> > +/*
> > + * Copyright (C) 2015 Marvell Technology Group Ltd.
> > + *
> > + * Author: Jisheng Zhang <jszhang@...vell.com>
> [...]
> > +/ {
> 
> Jisheng,
> 
> before I take this series, some nitpicking.
> 
> > +	model = "MARVELL BG4CT DMP BOARD";
> 
> Are you fine with fixing the broken CAPSLOCK key, i.e. make above
> "Marvell BG4CT DMP board" ?

It doesn't matter, will do in newer version.

> 
> > +	compatible = "marvell,berlin4ct-dmp", "marvell,berlin4ct", "marvell,berlin";
> > +
> > +	chosen {
> > +		stdout-path = "serial0:115200n8";
> > +	};
> > +
> > +	memory {
> > +		device_type = "memory";
> > +		/* the first 16MB is for firmwares's usage */
> > +		reg = <0 0x01000000 0 0x80000000>;
> > +	};
> > +};
> > +
> > +&uart0 {
> > +	status = "okay";
> > +};
> > diff --git a/arch/arm64/boot/dts/marvell/berlin4ct.dtsi b/arch/arm64/boot/dts/marvell/berlin4ct.dtsi
> > new file mode 100644
> > index 0000000..becaedc
> > --- /dev/null
> > +++ b/arch/arm64/boot/dts/marvell/berlin4ct.dtsi
> > @@ -0,0 +1,164 @@
> > +/*
> > + * Copyright (C) 2015 Marvell Technology Group Ltd.
> > + *
> > + * Author: Jisheng Zhang <jszhang@...vell.com>
> [...]
> > +
> > +/ {
> > +	compatible = "marvell,berlin";
> 
> compatible = "marvell,berlin4ct", "marvell,berlin";

Thanks for pointing this out.

> 
> > +	interrupt-parent = <&gic>;
> > +	#address-cells = <2>;
> > +	#size-cells = <2>;
> [...]
> > +	soc {
> > +		compatible = "simple-bus";
> > +		#address-cells = <1>;
> > +		#size-cells = <1>;
> > +		ranges = <0 0 0xf7000000 0x1000000>;
> > +
> > +		osc: osc {
> > +			compatible = "fixed-clock";
> > +			#clock-cells = <0>;
> > +			clock-frequency = <25000000>;
> > +		};
> 
> Is the oscillator above really part of the SoC bus fabric? If 25MHz is

No. it's not part of SoC bus.

> the only option for an external OSC, I suggest to move it at least out
> of the soc {} node.

Good idea.

Thanks for the review,
Jisheng

> 
> Sebastian
> 
> > +		gic: interrupt-controller@...000 {
> > +			compatible = "arm,gic-400";
> > +			#interrupt-cells = <3>;
> > +			interrupt-controller;
> > +			reg = <0x901000 0x1000>,
> > +			      <0x902000 0x2000>,
> > +			      <0x904000 0x2000>,
> > +			      <0x906000 0x2000>;
> > +			interrupts = <GIC_PPI 9 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_HIGH)>;
> > +		};
> > +
> > +		apb@...000 {
> > +			compatible = "simple-bus";
> > +			#address-cells = <1>;
> > +			#size-cells = <1>;
> > +			ranges = <0 0xfc0000 0x10000>;
> > +			interrupt-parent = <&sic>;
> > +
> > +			sic: interrupt-controller@...0 {
> > +				compatible = "snps,dw-apb-ictl";
> > +				reg = <0x1000 0x30>;
> > +				interrupt-controller;
> > +				#interrupt-cells = <1>;
> > +				interrupt-parent = <&gic>;
> > +				interrupts = <GIC_SPI 17 IRQ_TYPE_LEVEL_HIGH>;
> > +			};
> > +
> > +			uart0: uart@...0 {
> > +				compatible = "snps,dw-apb-uart";
> > +				reg = <0xd000 0x100>;
> > +				interrupts = <8>;
> > +				clocks = <&osc>;
> > +				reg-shift = <2>;
> > +				status = "disabled";
> > +			};
> > +		};
> > +	};
> > +};
> >

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