linux-kernel - Re: [PATCH 4/6] ARM: tegra: rework fuse.c

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Date:	Thu, 2 Jan 2014 13:37:43 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Peter De Schrijver <pdeschrijver@...dia.com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Russell King <linux@....linux.org.uk>,
	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Danny Huang <dahuang@...dia.com>,
	Prashant Gaikwad <pgaikwad@...dia.com>
Subject: Re: [PATCH 4/6] ARM: tegra: rework fuse.c

On Thu, Dec 19, 2013 at 4:54 PM, Peter De Schrijver
<pdeschrijver@...dia.com> wrote:

> Reduce fuse.c to the minimum functionality required for the early bootstages.
> Also export tegra_read_straps() for use by the fuse driver.
>
> Signed-off-by: Peter De Schrijver <pdeschrijver@...dia.com>

Aha, but why?

> -static void __init tegra20_fuse_init_randomness(void)
> -{
> -       u32 randomness[2];
> -
> -       randomness[0] = tegra_fuse_readl(FUSE_UID_LOW);
> -       randomness[1] = tegra_fuse_readl(FUSE_UID_HIGH);
> -
> -       add_device_randomness(randomness, sizeof(randomness));
> -}
> -
> -/* Applies to Tegra30 or later */
> -static void __init tegra30_fuse_init_randomness(void)
> -{
> -       u32 randomness[7];
> -
> -       randomness[0] = tegra_fuse_readl(FUSE_VENDOR_CODE);
> -       randomness[1] = tegra_fuse_readl(FUSE_FAB_CODE);
> -       randomness[2] = tegra_fuse_readl(FUSE_LOT_CODE_0);
> -       randomness[3] = tegra_fuse_readl(FUSE_LOT_CODE_1);
> -       randomness[4] = tegra_fuse_readl(FUSE_WAFER_ID);
> -       randomness[5] = tegra_fuse_readl(FUSE_X_COORDINATE);
> -       randomness[6] = tegra_fuse_readl(FUSE_Y_COORDINATE);
> -
> -       add_device_randomness(randomness, sizeof(randomness));
> -}

We still want to get this into the random pool right? Can it not simply
be moved to a later initcall then?

Yours,
Linus Walleij
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