linux-kernel - RE: [PATCH 3/4] arm64: dts: Add dts files for LG Electronics's lg1312 SoC

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Message-ID: <06be01d179ed$7e7c9940$7b75cbc0$@lge.com>
Date:	Wed, 9 Mar 2016 19:21:50 +0900
From:	"Chanho Min" <chanho.min@....com>
To:	"'Mark Rutland'" <mark.rutland@....com>
Cc:	<arm@...nel.org>, "'Arnd Bergmann'" <arnd@...db.de>,
	"'Catalin Marinas'" <catalin.marinas@....com>,
	"'Gunho Lee'" <gunho.lee@....com>,
	"'Will Deacon'" <will.deacon@....com>,
	<linux-kernel@...r.kernel.org>,
	"'Jongsung Kim'" <neidhard.kim@....com>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH 3/4] arm64: dts: Add dts files for LG Electronics's lg1312 SoC

> Hi,
> 
> On Mon, Mar 07, 2016 at 01:09:59PM +0900, Chanho Min wrote:
> > Add initial dtsi file to support lg1312 SoC which based on Cortex-A53.
> > Also add dts file to support lg1312 reference board which based on
> > lg1312 SoC.
> >
> > Signed-off-by: Chanho Min <chanho.min@....com>
> 
> I have a few comments on this patch below.
> 
> > +/ {
> > +	#address-cells = <2>;
> > +	#size-cells = <1>;
> 
> Is there definitely no reason to require a 64-bit size? e.g. ranges?
> 
> Generally I'd expect both address and size to be described as 64 bit
> quantities in the root node, to make it less painful to extend in future.
> 
> > +
> > +	model = "LG Electronics, DTV SoC LG1312 Reference Board";
> > +	compatible = "lge,lg1312-ref", "lge,lg1312";
> > +
> > +	memory {
> > +		device_type = "memory";
> > +		reg = <0x0 0x00000000 0x20000000>;
> > +	};
> > +
> > +	chosen {
> > +		bootargs = "root=/dev/nfs ip=dhcp";
> > +	};
> > +};
> 
> Drop these bootargs. This is specific to a particular developer's
> configuration, and they make no sense alone given the lack of an nfsroot, so
> they're evidently being overwritten anyway.
> 
> > +	psci {
> > +		compatible  = "arm,psci";
> > +		method = "smc";
> > +		cpu_suspend = <0x84000001>;
> > +		cpu_off = <0x84000002>;
> > +		cpu_on = <0x84000003>;
> > +	};
> 
> What are you using as your PSCI implementation?
> 
> Is it not PSCI 0.2+ compliant?
No, Our TZ firmware support for psci 0.1 only.

> 
> Which exception level are you booting at?
EL3.

> 
> > +	gic: interrupt-controller@...01000 {
> > +		#interrupt-cells = <3>;
> > +
> > +		compatible = "arm,gic-400";
> > +		interrupt-controller;
> > +		reg = <0x0 0xc0001000 0x1000>,
> > +		      <0x0 0xc0002000 0x1000>;
> > +	};
> 
> I believe the CPU interface is too short (as GICC_DIR lives at 0x1000).
> 
> What about GICH and GICV?
> 
> > +	pmu {
> > +		compatible = "arm,armv8-pmuv3";
> 
> Use "arm,cortex-a53-pmu".
> 
> > +	timer {
> > +		compatible = "arm,armv8-timer";
> > +		interrupts = <GIC_PPI 13 ARMV8_TIMER_IRQ_TYPE>,
> > +			     <GIC_PPI 14 ARMV8_TIMER_IRQ_TYPE>;
> > +		clock-frequency = <24000000>;
> > +	};
> 
> Please fix your firmware to program CNTFRQ.
> 
> The clock-frequency property is at best a workaround for a broken system, and
> is not sufficient in general.
> 
> > +	clocks {
> > +		clk_bus: clk_bus {
> > +			#clock-cells = <0>;
> > +
> > +			compatible = "fixed-clock";
> > +			clock-frequency = <198000000>;
> > +			clock-output-names = "BUSCLK";
> > +		};
> > +	};
> 
> Just put this fixed-clock under the root node. There is nothing special about
> /clocks; it is not required to be probed and serves no purpose.
> 
> Thanks,
> Mark.

I'll resend this patch with fixes that you and Arnd mentioned.

Thanks
Chanho