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

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Message-ID: <CACRpkdZN-iwdR_VwktdHsw+rGQLhCgmWnERYVDE+KaYOqJR30w@mail.gmail.com>
Date:	Mon, 9 Nov 2015 11:09:54 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Kapil Hali <kapilh@...adcom.com>
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>,
	Florian Fainelli <f.fainelli@...il.com>,
	Gregory Fong <gregory.0xf0@...il.com>,
	Lee Jones <lee@...nel.org>, Hauke Mehrtens <hauke@...ke-m.de>,
	Heiko Stuebner <heiko@...ech.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

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?

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.

Yours,
Linus Walleij
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