linux-kernel - Re: [PATCH v2 2/5] clk: sunxi-ng: mux: support fixed pre-dividers on multiple parents

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Date:   Tue, 23 Aug 2016 11:57:32 +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>,
        linux-clk <linux-clk@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 2/5] clk: sunxi-ng: mux: support fixed pre-dividers on
 multiple parents

On Tue, Aug 23, 2016 at 05:52:59PM +0800, Chen-Yu Tsai wrote:
> >>  static const char * const ahb2_parents[] = { "ahb1" , "pll-periph0" };
> >> +static const struct ccu_mux_fixed_prediv ahb2_fixed_predivs[] = {
> >> +     { .index = 1, .div = 2 },
> >> +     { },
> >> +};
> >>
> >> [...]
> >>
> >> --- a/drivers/clk/sunxi-ng/ccu_mux.h
> >> +++ b/drivers/clk/sunxi-ng/ccu_mux.h
> >> @@ -5,15 +5,18 @@
> >>
> >>  #include "ccu_common.h"
> >>
> >> +struct ccu_mux_fixed_prediv {
> >> +     u8      index;
> >> +     u16     div;
> >> +};
> >> +
> >>  struct ccu_mux_internal {
> >>       u8              shift;
> >>       u8              width;
> >>       const u8        *table;
> >>
> >> -     struct {
> >> -             u8      index;
> >> -             u16     div;
> >> -     } fixed_prediv;
> >> +     const struct ccu_mux_fixed_prediv       *fixed_predivs;
> >> +     u8              n_predivs;
> >
> > I don't think you're using it anywhere (at least you don't define it
> > in ahb2_clk, and the extra item in the array will introduce an
> > off-by-one error.
> 
> The truth is I forgot to update the change in ccu-sun8i-h3.c
> It is used correctly in the subsequent a31 patch. Sorry.
> 
> I'm not sure what you mean by the off-by-one error though. IIRC
> we initialize the structure using named fields.

What I meant was that remember to also remove the second empty field
in ahb2_fixed_predivs.

Maxime

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

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