linux-kernel - Re: [PATCH 4/9] clk: davinci: pll-dm646x: keep PLL2 SYSCLK1 always enabled

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Message-ID: <20180530172239.982.48723@harbor.lan>
Date:   Wed, 30 May 2018 10:22:39 -0700
From:   Michael Turquette <mturquette@...libre.com>
To:     David Lechner <david@...hnology.com>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     Sekhar Nori <nsekhar@...com>, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Kevin Hilman <khilman@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/9] clk: davinci: pll-dm646x: keep PLL2 SYSCLK1 always enabled

Quoting David Lechner (2018-05-25 11:11:45)
> From: Sekhar Nori <nsekhar@...com>
> 
> PLL2 SYSCLK1 on DM646x is connected to DDR2 PHY and cannot
> be disabled. Mark it so to prevent unused clock disable
> infrastructure from disabling it.
> 
> Signed-off-by: Sekhar Nori <nsekhar@...com>
> Reviewed-by: David Lechner <david@...hnology.com>
> ---
>  drivers/clk/davinci/pll-dm646x.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/clk/davinci/pll-dm646x.c b/drivers/clk/davinci/pll-dm646x.c
> index a61cc3256418..0ae827e3ce80 100644
> --- a/drivers/clk/davinci/pll-dm646x.c
> +++ b/drivers/clk/davinci/pll-dm646x.c
> @@ -72,7 +72,7 @@ static const struct davinci_pll_clk_info dm646x_pll2_info = {
>         .flags = 0,
>  };
>  
> -SYSCLK(1, pll2_sysclk1, pll2_pllen, 4, 0);
> +SYSCLK(1, pll2_sysclk1, pll2_pllen, 4, SYSCLK_ALWAYS_ENABLED);

Nitpick: I dislike setting a platform-specific flag that just sets a
framework-specific flag during clk registration.

I know there is some legacy here so I'll take this patch as-is, but
perhaps cleaning this up to directly use CLK_IS_CRITICAL can be added to
someone's todo list?

Thanks,
Mike

>  
>  int dm646x_pll2_init(struct device *dev, void __iomem *base)
>  {
> -- 
> 2.17.0
>