linux-kernel - Re: [PATCH RESEND v2 3/4] ARM: BCM: Add SMP support for Broadcom NSP

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Message-ID: <5642198C.2040205@broadcom.com>
Date:	Tue, 10 Nov 2015 21:51:32 +0530
From:	Kapil Hali <kapilh@...adcom.com>
To:	Florian Fainelli <f.fainelli@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>
CC:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	"Mark Rutland" <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"Russell King" <linux@....linux.org.uk>,
	Ray Jui <rjui@...adcom.com>,
	Scott Branden <sbranden@...adcom.com>,
	Jon Mason <jonmason@...adcom.com>,
	Gregory Fong <gregory.0xf0@...il.com>,
	Lee Jones <lee@...nel.org>, Hauke Mehrtens <hauke@...ke-m.de>,
	Kever Yang <kever.yang@...k-chips.com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Olof Johansson <olof@...om.net>,
	"Paul Walmsley" <paul@...an.com>, Chen-Yu Tsai <wens@...e.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>
Subject: Re: [PATCH RESEND v2 3/4] ARM: BCM: Add SMP support for Broadcom NSP

Hi Florian, Linus,

On 11/10/2015 7:59 AM, Florian Fainelli wrote:
> 2015-11-09 2:09 GMT-08:00 Linus Walleij <linus.walleij@...aro.org>:
>> On Fri, Nov 6, 2015 at 8:49 PM, Kapil Hali <kapilh@...adcom.com> wrote:
>>
>>> Add SMP support for Broadcom's Northstar Plus SoC
>>> cpu enable method. This changes also consolidates
>>> iProc family's - BCM NSP and BCM Kona, platform
>>> SMP handling in a common file.
>>>
>>> Northstar Plus SoC is based on ARM Cortex-A9
>>> revision r3p0 which requires configuration for ARM
>>> Errata 764369 for SMP. This change adds the needed
>>> configuration option.
>>>
>>> Signed-off-by: Kapil Hali <kapilh@...adcom.com>
>>
>> This version looks saner to me.
>>
>>> +static int nsp_write_lut(void)
>>> +{
>>> +       void __iomem *sku_rom_lut;
>>> +       phys_addr_t secondary_startup_phy;
>>> +
>>> +       if (!secondary_boot) {
>>> +               pr_warn("required secondary boot register not specified\n");
>>> +               return -EINVAL;
>>> +       }
>>> +
>>> +       sku_rom_lut = ioremap_nocache((phys_addr_t)secondary_boot,
>>> +                                               sizeof(secondary_boot));
>>
>> Why is this address not just taken directly from the device tree?
> 
> It comes directly from DT, that's what bcm_smp_prepare_cpus() does
> read from Device Tree.
> 
>>
>> If it is not in the device tree: why?
>>
>> Also give it a sane name, bcm_sec_boot_address or so.
>> "secondary_boot" sounds like a function you call to boot
>> the second core.
> 
> Agree with that, there could be a better name which better reflects
> this is a variable.
> 
As this change is consolidating SMP implementation, I kept the same 
name of the variable which was used in kona_smp.c so that the changes
in the common code is minimal. Also, the fact that the change is part
of up-streamed code, I didn't alter with the variable name. Shall I 
change it in the next patch?

Thanks,
Kapil

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