linux-kernel - Re: [PATCH 5/6] clk: ingenic: Support overriding PLLs M/N/OD calc algorithm

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Message-ID: <14fe0eed-5657-c555-f8eb-6e6b8b367b44@wanyeetech.com>
Date:   Wed, 10 Mar 2021 22:42:42 +0800
From:   Zhou Yanjie <zhouyanjie@...yeetech.com>
To:     Paul Cercueil <paul@...pouillou.net>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>
Cc:     od@...c.me, linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org
Subject: Re: [PATCH 5/6] clk: ingenic: Support overriding PLLs M/N/OD calc
 algorithm

Hi Paul,

On 2021/3/7 下午10:17, Paul Cercueil wrote:
> SoC-specific code can now provide a callback if they need to compute the
> M/N/OD values in a specific way.
>
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> ---
>   drivers/clk/ingenic/cgu.c | 40 ++++++++++++++++++++++++++-------------
>   drivers/clk/ingenic/cgu.h |  3 +++
>   2 files changed, 30 insertions(+), 13 deletions(-)


Tested-by: 周琰杰 (Zhou Yanjie)<zhouyanjie@...yeetech.com>   # on CU1000-neo/X1000E


> diff --git a/drivers/clk/ingenic/cgu.c b/drivers/clk/ingenic/cgu.c
> index 58f7ab5cf0fe..266c7595d330 100644
> --- a/drivers/clk/ingenic/cgu.c
> +++ b/drivers/clk/ingenic/cgu.c
> @@ -119,28 +119,42 @@ ingenic_pll_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
>   		n * od);
>   }
>   
> -static unsigned long
> -ingenic_pll_calc(const struct ingenic_cgu_clk_info *clk_info,
> -		 unsigned long rate, unsigned long parent_rate,
> -		 unsigned *pm, unsigned *pn, unsigned *pod)
> +static void
> +ingenic_pll_calc_m_n_od(const struct ingenic_cgu_pll_info *pll_info,
> +			unsigned long rate, unsigned long parent_rate,
> +			unsigned int *pm, unsigned int *pn, unsigned int *pod)
>   {
> -	const struct ingenic_cgu_pll_info *pll_info;
> -	unsigned m, n, od;
> -
> -	pll_info = &clk_info->pll;
> -	od = 1;
> +	unsigned int m, n, od = 1;
>   
>   	/*
>   	 * The frequency after the input divider must be between 10 and 50 MHz.
>   	 * The highest divider yields the best resolution.
>   	 */
>   	n = parent_rate / (10 * MHZ);
> -	n = min_t(unsigned, n, 1 << clk_info->pll.n_bits);
> -	n = max_t(unsigned, n, pll_info->n_offset);
> +	n = min_t(unsigned int, n, 1 << pll_info->n_bits);
> +	n = max_t(unsigned int, n, pll_info->n_offset);
>   
>   	m = (rate / MHZ) * od * n / (parent_rate / MHZ);
> -	m = min_t(unsigned, m, 1 << clk_info->pll.m_bits);
> -	m = max_t(unsigned, m, pll_info->m_offset);
> +	m = min_t(unsigned int, m, 1 << pll_info->m_bits);
> +	m = max_t(unsigned int, m, pll_info->m_offset);
> +
> +	*pm = m;
> +	*pn = n;
> +	*pod = od;
> +}
> +
> +static unsigned long
> +ingenic_pll_calc(const struct ingenic_cgu_clk_info *clk_info,
> +		 unsigned long rate, unsigned long parent_rate,
> +		 unsigned int *pm, unsigned int *pn, unsigned int *pod)
> +{
> +	const struct ingenic_cgu_pll_info *pll_info = &clk_info->pll;
> +	unsigned int m, n, od;
> +
> +	if (pll_info->calc_m_n_od)
> +		(*pll_info->calc_m_n_od)(pll_info, rate, parent_rate, &m, &n, &od);
> +	else
> +		ingenic_pll_calc_m_n_od(pll_info, rate, parent_rate, &m, &n, &od);
>   
>   	if (pm)
>   		*pm = m;
> diff --git a/drivers/clk/ingenic/cgu.h b/drivers/clk/ingenic/cgu.h
> index 10521d1b7b12..bfc2b9c38a41 100644
> --- a/drivers/clk/ingenic/cgu.h
> +++ b/drivers/clk/ingenic/cgu.h
> @@ -55,6 +55,9 @@ struct ingenic_cgu_pll_info {
>   	s8 bypass_bit;
>   	u8 enable_bit;
>   	u8 stable_bit;
> +	void (*calc_m_n_od)(const struct ingenic_cgu_pll_info *pll_info,
> +			    unsigned long rate, unsigned long parent_rate,
> +			    unsigned int *m, unsigned int *n, unsigned int *od);
>   };
>   
>   /**