linux-kernel - Re: [PATCH 1/9] clk: imx: Replace all the clk based helpers with macros

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Date:   Tue, 19 Nov 2019 16:28:59 +0000
From:   Leonard Crestez <leonard.crestez@....com>
To:     Abel Vesa <abel.vesa@....com>, Shawn Guo <shawnguo@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>
CC:     Aisheng Dong <aisheng.dong@....com>,
        Sascha Hauer <kernel@...gutronix.de>,
        Jacky Bai <ping.bai@....com>, Peng Fan <peng.fan@....com>,
        dl-linux-imx <linux-imx@....com>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/9] clk: imx: Replace all the clk based helpers with
 macros

On 2019-11-19 4:08 PM, Abel Vesa wrote:
> Replacing with macros all the clk based API helpers we reduce the code
> duplication. The end goal is to get rid of all these macros when there
> will be no more users of the clk based API, that is, when all the i.MX
> clock provider drivers will be switched completely to the clk_hw based
> API.

I personally prefer inline functions to macros whenever possible (so 
everything other than for_each and similar).

BTW: All of these macros will crash if the underlying clk_hw 
registration returns null or error.

> This is another step in moving away from the non clk_hw based API usage
> throughout the i.MX clock drivers. The reason for doing that is to
> have a clear split between the clock provider and the clock consumer API.
> 
> Signed-off-by: Abel Vesa <abel.vesa@....com>
> ---
>   drivers/clk/imx/clk.h | 39 ++++++++++++---------------------------
>   1 file changed, 12 insertions(+), 27 deletions(-)
> 
> diff --git a/drivers/clk/imx/clk.h b/drivers/clk/imx/clk.h
> index bc5bb6a..945ce4d 100644
> --- a/drivers/clk/imx/clk.h
> +++ b/drivers/clk/imx/clk.h
> @@ -73,9 +73,18 @@ extern struct imx_pll14xx_clk imx_1443x_pll;
>   #define imx_clk_fixed_factor(name, parent, mult, div) \
>   	imx_clk_hw_fixed_factor(name, parent, mult, div)->clk
>   
> +#define imx_clk_divider(name, parent, reg, shift, width) \
> +	imx_clk_hw_divider(name, parent, reg, shift, width)->clk
> +
>   #define imx_clk_divider2(name, parent, reg, shift, width) \
>   	imx_clk_hw_divider2(name, parent, reg, shift, width)->clk
>   
> +#define imx_clk_divider_flags(name, parent, reg, shift, width, flags) \
> +	imx_clk_hw_divider_flags(name, parent, reg, shift, width, flags)->clk
> +
> +#define imx_clk_gate(name, parent, reg, shift) \
> +	imx_clk_hw_gate(name, parent, reg, shift)->clk
> +
>   #define imx_clk_gate_dis(name, parent, reg, shift) \
>   	imx_clk_hw_gate_dis(name, parent, reg, shift)->clk
>   
> @@ -97,6 +106,9 @@ extern struct imx_pll14xx_clk imx_1443x_pll;
>   #define imx_clk_mux(name, reg, shift, width, parents, num_parents) \
>   	imx_clk_hw_mux(name, reg, shift, width, parents, num_parents)->clk
>   
> +#define imx_clk_fixed(name, rate) \
> +	imx_clk_hw_fixed(name, rate)->clk
> +
>   struct clk *imx_clk_pll14xx(const char *name, const char *parent_name,
>   		 void __iomem *base, const struct imx_pll14xx_clk *pll_clk);
>   
> @@ -198,11 +210,6 @@ struct clk_hw *imx_clk_hw_fixup_mux(const char *name, void __iomem *reg,
>   			      u8 shift, u8 width, const char * const *parents,
>   			      int num_parents, void (*fixup)(u32 *val));
>   
> -static inline struct clk *imx_clk_fixed(const char *name, int rate)
> -{
> -	return clk_register_fixed_rate(NULL, name, NULL, 0, rate);
> -}
> -
>   static inline struct clk_hw *imx_clk_hw_fixed(const char *name, int rate)
>   {
>   	return clk_hw_register_fixed_rate(NULL, name, NULL, 0, rate);
> @@ -224,13 +231,6 @@ static inline struct clk_hw *imx_clk_hw_fixed_factor(const char *name,
>   			CLK_SET_RATE_PARENT, mult, div);
>   }
>   
> -static inline struct clk *imx_clk_divider(const char *name, const char *parent,
> -		void __iomem *reg, u8 shift, u8 width)
> -{
> -	return clk_register_divider(NULL, name, parent, CLK_SET_RATE_PARENT,
> -			reg, shift, width, 0, &imx_ccm_lock);
> -}
> -
>   static inline struct clk_hw *imx_clk_hw_divider(const char *name,
>   						const char *parent,
>   						void __iomem *reg, u8 shift,
> @@ -240,14 +240,6 @@ static inline struct clk_hw *imx_clk_hw_divider(const char *name,
>   				       reg, shift, width, 0, &imx_ccm_lock);
>   }
>   
> -static inline struct clk *imx_clk_divider_flags(const char *name,
> -		const char *parent, void __iomem *reg, u8 shift, u8 width,
> -		unsigned long flags)
> -{
> -	return clk_register_divider(NULL, name, parent, flags,
> -			reg, shift, width, 0, &imx_ccm_lock);
> -}
> -
>   static inline struct clk_hw *imx_clk_hw_divider_flags(const char *name,
>   						   const char *parent,
>   						   void __iomem *reg, u8 shift,
> @@ -274,13 +266,6 @@ static inline struct clk *imx_clk_divider2_flags(const char *name,
>   			reg, shift, width, 0, &imx_ccm_lock);
>   }
>   
> -static inline struct clk *imx_clk_gate(const char *name, const char *parent,
> -		void __iomem *reg, u8 shift)
> -{
> -	return clk_register_gate(NULL, name, parent, CLK_SET_RATE_PARENT, reg,
> -			shift, 0, &imx_ccm_lock);
> -}
> -
>   static inline struct clk_hw *imx_clk_hw_gate_flags(const char *name, const char *parent,
>   		void __iomem *reg, u8 shift, unsigned long flags)
>   {
>