linux-kernel - Re: [PATCH 04/11] clk: sunxi-ng: Support separately grouped PLL lock status register

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Message-ID: <20170126095733.azlzxmz63vxajlen@lukather>
Date:   Thu, 26 Jan 2017 10:57:33 +0100
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH 04/11] clk: sunxi-ng: Support separately grouped PLL lock
 status register

Hi,

On Tue, Jan 24, 2017 at 10:32:23AM +0800, Chen-Yu Tsai wrote:
> On the Allwinner A80 SoC, the PLL lock status indicators are grouped
> together in a separate register, as opposed to being scattered in each
> PLL's configuration register.
> 
> Add a flag to support this.
> 
> Signed-off-by: Chen-Yu Tsai <wens@...e.org>
> ---
>  drivers/clk/sunxi-ng/ccu_common.c | 8 ++++++--
>  drivers/clk/sunxi-ng/ccu_common.h | 2 ++
>  2 files changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/clk/sunxi-ng/ccu_common.c b/drivers/clk/sunxi-ng/ccu_common.c
> index 51d4bac97ab3..3fd0c3331aff 100644
> --- a/drivers/clk/sunxi-ng/ccu_common.c
> +++ b/drivers/clk/sunxi-ng/ccu_common.c
> @@ -25,13 +25,17 @@ static DEFINE_SPINLOCK(ccu_lock);
>  
>  void ccu_helper_wait_for_lock(struct ccu_common *common, u32 lock)
>  {
> +	void __iomem *addr;
>  	u32 reg;
>  
>  	if (!lock)
>  		return;
>  
> -	WARN_ON(readl_relaxed_poll_timeout(common->base + common->reg, reg,
> -					   reg & lock, 100, 70000));
> +	addr = common->base + common->reg;
> +	if (common->features & CCU_FEATURE_LOCK_REG)
> +		addr = common->base + common->lock_reg;

I'd rather have an else here (but it's really just a nitpick).

Thanks,
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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