linux-kernel - Re: [PATCH] clk: fix link error for rcar-gen2

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Message-ID: <20161102083731.GB30742@verge.net.au>
Date:   Wed, 2 Nov 2016 09:37:32 +0100
From:   Simon Horman <horms@...ge.net.au>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Magnus Damm <damm+renesas@...nsource.se>,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] clk: fix link error for rcar-gen2

On Wed, Nov 02, 2016 at 09:14:02AM +0100, Geert Uytterhoeven wrote:
> Hi Simon,
> 
> On Mon, Oct 31, 2016 at 10:52 AM, Simon Horman <horms@...ge.net.au> wrote:
> > From: Simon Horman <horms+renesas@...ge.net.au>
> > Subject: [PATCH] ARM: shmobile: only call rcar_gen2_clocks_init() if present
> >
> > The RZ/G1M (r8a7743) uses the R-Car Gen2 core, but not the R-Car Gen2 clock
> > driver. This is a harbinger of a transition for R-Car Gen2 SoCs. As the
> > process to get all the required pieces in place is somewhat complex it
> > seems useful to try to disentangle dependencies where possible.
> >
> > The approach here is to temporarily disable calling rcar_gen2_clocks_init()
> > if no R-Car Gen2 SoC are configured and thus the symbol will not be
> > present.
> >
> > Fixes: 1254f607fc3d ("ARM: shmobile: r8a7743: basic SoC support")
> > Signed-off-by: Simon Horman <horms+renesas@...ge.net.au>
> > ---
> >
> > The current likely path to removing need for this is for
> > "[PATCH v4 00/23] soc: renesas: Add R-Car RST driver for obtaining mode
> > pin state" to be accepted. In particular patch 20 removes the call to
> > rcar_gen2_clocks_init() in rcar_gen2_timer_init().
> > ---
> >  arch/arm/mach-shmobile/setup-rcar-gen2.c | 8 +++++++-
> >  1 file changed, 7 insertions(+), 1 deletion(-)
> >
> > diff --git a/arch/arm/mach-shmobile/setup-rcar-gen2.c b/arch/arm/mach-shmobile/setup-rcar-gen2.c
> > index 875bcb8c1026..657262556dc4 100644
> > --- a/arch/arm/mach-shmobile/setup-rcar-gen2.c
> > +++ b/arch/arm/mach-shmobile/setup-rcar-gen2.c
> > @@ -131,7 +131,13 @@ void __init rcar_gen2_timer_init(void)
> >         iounmap(base);
> >  #endif /* CONFIG_ARM_ARCH_TIMER */
> >
> > -       rcar_gen2_clocks_init(mode);
> > +       if (IS_ENABLED(CONFIG_ARCH_R8A7790) ||
> > +           IS_ENABLED(CONFIG_ARCH_R8A7791) ||
> > +           IS_ENABLED(CONFIG_ARCH_R8A7792) ||
> > +           IS_ENABLED(CONFIG_ARCH_R8A7793) ||
> > +           IS_ENABLED(CONFIG_ARCH_R8A7794))
> > +               rcar_gen2_clocks_init(mode);
> 
> Upon second thought (triggered bySergei conflict notification), this needs
> an else clause:
> 
>         else
>                 of_clk_init(NULL);

Thanks, I will add that.