linux-kernel - Re: [PATCH 5/9] clk: sunxi-ng: mux: support fixed pre-dividers on multiple parents

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Date:	Wed, 27 Jul 2016 09:26:10 +0200
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Chen-Yu Tsai <wens@...e.org>
Cc:	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Rob Herring <robh+dt@...nel.org>,
	Mark Rutland <mark.rutland@....com>, dev@...ux-sunxi.org,
	linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/9] clk: sunxi-ng: mux: support fixed pre-dividers on
 multiple parents

Hi,

On Tue, Jul 26, 2016 at 03:04:27PM +0800, Chen-Yu Tsai wrote:
> Some clocks on the A31 have fixed pre-dividers on multiple parents.
> Add support for them.
> 
> Signed-off-by: Chen-Yu Tsai <wens@...e.org>
> ---
>  drivers/clk/sunxi-ng/ccu-sun8i-h3.c |  9 +++++----
>  drivers/clk/sunxi-ng/ccu_mux.c      |  6 ++++--
>  drivers/clk/sunxi-ng/ccu_mux.h      | 10 ++++++----
>  3 files changed, 15 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/clk/sunxi-ng/ccu-sun8i-h3.c b/drivers/clk/sunxi-ng/ccu-sun8i-h3.c
> index 9af359544110..5f5c900c235b 100644
> --- a/drivers/clk/sunxi-ng/ccu-sun8i-h3.c
> +++ b/drivers/clk/sunxi-ng/ccu-sun8i-h3.c
> @@ -184,15 +184,16 @@ static SUNXI_CCU_MP_WITH_MUX(apb2_clk, "apb2", apb2_parents, 0x058,
>  			     0);
>  
>  static const char * const ahb2_parents[] = { "ahb1" , "pll-periph0" };
> +static const struct ccu_mux_fixed_prediv ahb2_fixed_predivs[] = {
> +	{ .index = 1, .div = 2},
> +	{ },
> +};
>  static struct ccu_mux ahb2_clk = {
>  	.mux		= {
>  		.shift	= 0,
>  		.width	= 1,
>  
> -		.fixed_prediv	= {
> -			.index	= 1,
> -			.div	= 2,
> -		},
> +		.fixed_predivs	= ahb2_fixed_predivs,

I think I'd prefer to have the number of dividers too, instead of
iterating until we find a 0 one. It's easier to iterate over it, the
errors are easier to catch and it's consistent with the other arrays
we give, for example for the parents.

Maxime

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

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