linux-kernel - Re: [PATCH v2 3/9] clk: rockchip: add clock controller for rk3036

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Date:	Wed, 07 Oct 2015 12:24:32 +0200
From:	Heiko Stuebner <heiko@...ech.de>
To:	Xing Zheng <zhengxing@...k-chips.com>
Cc:	linux-rockchip@...ts.infradead.org,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 3/9] clk: rockchip: add clock controller for rk3036

Hi,

Am Donnerstag, 24. September 2015, 11:31:58 schrieb Xing Zheng:
> On 2015年09月24日 11:04, Xing Zheng wrote:
> >>>   #define RK3066_PLL_RATE(_rate, _nr, _nf, _no)    \
> >>> 
> >>> @@ -95,12 +106,31 @@ enum rockchip_pll_type {
> >>> 
> >>>       .nb = _nb,                        \
> >>>   
> >>>   }
> >>> 
> >>> +#define RK3036_PLL_RATE(_rate, _refdiv, _fbdiv, _postdiv1,    \
> >>> +            _postdiv2, _dsmpd, _frac)        \
> >>> +{                                \
> >>> +    .rate    = _rate##U,                    \
> >>> +    .fbdiv = _fbdiv,                    \
> >>> +    .postdiv1 = _postdiv1,                    \
> >>> +    .refdiv = _refdiv,                    \
> >>> +    .postdiv2 = _postdiv2,                    \
> >>> +    .dsmpd = _dsmpd,                    \
> >>> +    .frac = _frac,                        \
> >>> +}
> >>> +
> >>> 
> >>>   struct rockchip_pll_rate_table {
> >>>   
> >>>       unsigned long rate;
> >>>       unsigned int nr;
> >>>       unsigned int nf;
> >>>       unsigned int no;
> >>>       unsigned int nb;
> >>> 
> >>> +    /* for RK3036 */
> >>> +    unsigned int fbdiv;
> >>> +    unsigned int postdiv1;
> >>> +    unsigned int refdiv;
> >>> +    unsigned int postdiv2;
> >>> +    unsigned int dsmpd;
> >>> +    unsigned int frac;
> >> 
> >> same for these 2 ... should be part of the pll addition itself
> >> 
> >   };
> > 
> > Done.
> 
> Sorry, I have one question:
> The "struct rockchip_pll_rate_table" is called in "rockchip/clk-pll.c"
> on many functions, I think I could add a struct like:
> struct rk3036_pll_rate_table {
>      unsigned int fbdiv;
>      unsigned int postdiv1;
>      unsigned int refdiv;
>      unsigned int postdiv2;
>      unsigned int dsmpd;
>      unsigned int frac;
> };
> but, it will add many redundancy codes in "rockchip/clk-pll.c" just for
> call "struct rk3036_pll_rate_table".


One possible solution may be to cast to void* in the general functions, so 
have sturct rk3066_pll_rate_table, rk3036_pll_rate_table, have 
rockchip_clk_register_pll and friends handle it as void* and then only have 
the rockchip_rk3066_pll_* functions as well as the clk-rkxxxx.c use them as 
their actual type, as they know which they need.


Heiko

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