linux-kernel - Re: [PATCH v3 1/7] clk: introduce clk_div

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Message-ID: <20150618194815.GK29640@codeaurora.org>
Date:	Thu, 18 Jun 2015 12:48:16 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org, Sascha Hauer <kernel@...gutronix.de>,
	Peter De Schrijver <pdeschrijver@...dia.com>,
	Tero Kristo <t-kristo@...com>,
	Russell King <linux@....linux.org.uk>,
	Dinh Nguyen <dinguyen@...nsource.altera.com>
Subject: Re: [PATCH v3 1/7] clk: introduce clk_div_mask() helper

On 03/31, Andy Shevchenko wrote:
> diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
> index 5591ea7..20b0b67 100644
> --- a/include/linux/clk-provider.h
> +++ b/include/linux/clk-provider.h
> @@ -353,6 +353,11 @@ struct clk_divider {
>  	spinlock_t	*lock;
>  };
>  
> +static inline unsigned long clk_div_mask(u8 width)
> +{
> +	return (1 << width) - 1;
> +}
> +

Why not just change drivers to use GENMASK? It's a proven and
tested way to generate a bitmask.

So I'd rather see drivers converted to use that macro directly
especially because the mask may need to start at some bit that
isn't 0.

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