linux-kernel - Re: [PATCH v5 08/11] clk: sunxi-ng: mux: Support finding closest rate

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Message-ID: <4283806.ejJDZkT8p0@jernej-laptop>
Date:   Sun, 06 Aug 2023 15:42:24 +0200
From:   Jernej Škrabec <jernej.skrabec@...il.com>
To:     Maxime Ripard <mripard@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Samuel Holland <samuel@...lland.org>,
        Andre Przywara <andre.przywara@....com>,
        Roman Beranek <me@...y.cz>, Frank Oltmanns <frank@...manns.dev>
Cc:     linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Frank Oltmanns <frank@...manns.dev>
Subject: Re: [PATCH v5 08/11] clk: sunxi-ng: mux: Support finding closest rate

Dne nedelja, 06. avgust 2023 ob 15:06:53 CEST je Frank Oltmanns napisal(a):
> When finding the best rate for a mux clock, consider rates that are
> higher than the requested rate when CCU_FEATURE_ROUND_CLOSEST is used.
> Furthermore, introduce an initialization macro that sets this flag.
> 
> Acked-by: Maxime Ripard <mripard@...nel.org>
> Signed-off-by: Frank Oltmanns <frank@...manns.dev>

Reviewed-by: Jernej Skrabec <jernej.skrabec@...il.com>

Best regards,
Jernej

> ---
>  drivers/clk/sunxi-ng/ccu_mux.c | 13 ++++++++++++-
>  drivers/clk/sunxi-ng/ccu_mux.h | 38 +++++++++++++++++++++++++++-----------
>  2 files changed, 39 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/clk/sunxi-ng/ccu_mux.c b/drivers/clk/sunxi-ng/ccu_mux.c
> index 3ca695439620..5edc63b46651 100644
> --- a/drivers/clk/sunxi-ng/ccu_mux.c
> +++ b/drivers/clk/sunxi-ng/ccu_mux.c
> @@ -242,6 +242,17 @@ static int ccu_mux_set_parent(struct clk_hw *hw, u8
> index) return ccu_mux_helper_set_parent(&cm->common, &cm->mux, index);
>  }
> 
> +static int ccu_mux_determine_rate(struct clk_hw *hw,
> +				  struct clk_rate_request *req)
> +{
> +	struct ccu_mux *cm = hw_to_ccu_mux(hw);
> +
> +	if (cm->common.features & CCU_FEATURE_CLOSEST_RATE)
> +		return clk_mux_determine_rate_flags(hw, req, 
CLK_MUX_ROUND_CLOSEST);
> +
> +	return clk_mux_determine_rate_flags(hw, req, 0);
> +}
> +
>  static unsigned long ccu_mux_recalc_rate(struct clk_hw *hw,
>  					 unsigned long 
parent_rate)
>  {
> @@ -259,7 +270,7 @@ const struct clk_ops ccu_mux_ops = {
>  	.get_parent	= ccu_mux_get_parent,
>  	.set_parent	= ccu_mux_set_parent,
> 
> -	.determine_rate	= __clk_mux_determine_rate,
> +	.determine_rate	= ccu_mux_determine_rate,
>  	.recalc_rate	= ccu_mux_recalc_rate,
>  };
>  EXPORT_SYMBOL_NS_GPL(ccu_mux_ops, SUNXI_CCU);
> diff --git a/drivers/clk/sunxi-ng/ccu_mux.h b/drivers/clk/sunxi-ng/ccu_mux.h
> index 2c1811a445b0..eb1172ebbd94 100644
> --- a/drivers/clk/sunxi-ng/ccu_mux.h
> +++ b/drivers/clk/sunxi-ng/ccu_mux.h
> @@ -46,20 +46,36 @@ struct ccu_mux {
>  	struct ccu_common	common;
>  };
> 
> +#define SUNXI_CCU_MUX_TABLE_WITH_GATE_FEAT(_struct, _name, _parents,
> _table,	\ +				     _reg, _shift, 
_width, _gate,		\
> +				     _flags, _features)		
		\
> +	struct ccu_mux _struct = {					
	\
> +		.enable	= _gate,				
		\
> +		.mux	= _SUNXI_CCU_MUX_TABLE(_shift, _width, 
_table),		\
> +		.common	= {					
		\
> +			.reg		= _reg,			
		\
> +			.hw.init	= CLK_HW_INIT_PARENTS(_name,	
	\
> +							      
_parents,		\
> +							      
&ccu_mux_ops,	\
> +							      
_flags),		\
> +			.features	= _features,			
	\
> +		}						
		\
> +	}
> +
> +#define SUNXI_CCU_MUX_TABLE_WITH_GATE_CLOSEST(_struct, _name, _parents,	
\
> +					      _table, _reg, 
_shift,	\
> +					      _width, _gate, 
_flags)	\
> +	SUNXI_CCU_MUX_TABLE_WITH_GATE_FEAT(_struct, _name, _parents,	
\
> +					   _table, _reg, 
_shift,	\
> +					   _width, _gate, 
_flags,	\
> +					   
CCU_FEATURE_CLOSEST_RATE)
> +
>  #define SUNXI_CCU_MUX_TABLE_WITH_GATE(_struct, _name, _parents, _table,	
\
>  				     _reg, _shift, _width, _gate,	
\
>  				     _flags)			
	\
> -	struct ccu_mux _struct = {					
\
> -		.enable	= _gate,				
	\
> -		.mux	= _SUNXI_CCU_MUX_TABLE(_shift, _width, 
_table),	\
> -		.common	= {					
	\
> -			.reg		= _reg,		
		\
> -			.hw.init	= CLK_HW_INIT_PARENTS(_name,	
\
> -							      
_parents, \
> -							      
&ccu_mux_ops, \
> -							      
_flags),	\
> -		}						
	\
> -	}
> +	SUNXI_CCU_MUX_TABLE_WITH_GATE_FEAT(_struct, _name, _parents,	
\
> +					   _table, _reg, 
_shift,	\
> +					   _width, _gate, 
_flags, 0)
> 
>  #define SUNXI_CCU_MUX_WITH_GATE(_struct, _name, _parents, _reg,		
\
>  				_shift, _width, _gate, _flags)	
	\