linux-kernel - Re: [PATCH 3/5] clk: qcom: gcc-ipq6018: remove alpha values from NSS Crypto PLL's config

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Message-ID: <f4ip6jde5ffs6nvpllqhjleeb4s3j6hok5decxrof3inexh7ut@esgcsblz7wcj>
Date: Fri, 25 Oct 2024 09:18:40 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Gabor Juhos <j4g8y7@...il.com>
Cc: Bjorn Andersson <andersson@...nel.org>, 
	Michael Turquette <mturquette@...libre.com>, Stephen Boyd <sboyd@...nel.org>, linux-arm-msm@...r.kernel.org, 
	linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/5] clk: qcom: gcc-ipq6018: remove alpha values from NSS
 Crypto PLL's config

On Mon, Oct 21, 2024 at 10:21:59PM +0200, Gabor Juhos wrote:
> Since both the 'alpha' and 'alpha_hi' members of the configuration is
> initialized with zero values, the output rate of the PLL will be the
> same whether alpha mode is enabled or not.
> 
> Remove the initialization of the alpha* members to make it clear that
> alpha mode is not required to get the desired output rate.
> 
> While at it, also add a comment to indicate the frequency the PLL runs
> at with the current configuration.
> 
> No functional changes, the PLL runs at 1.2 GHz both before and after
> the change.
> 
> Tested on Xiaomi Mi Router AX1800 (IPQ6018, out-of-tree board).
> 
> Signed-off-by: Gabor Juhos <j4g8y7@...il.com>
> ---
>  drivers/clk/qcom/gcc-ipq6018.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/clk/qcom/gcc-ipq6018.c b/drivers/clk/qcom/gcc-ipq6018.c
> index ab0f7fc665a9790dd8edba0cf4b86c5c672a337d..d861191b0c85ccc105ac0e62d7a68210c621fc13 100644
> --- a/drivers/clk/qcom/gcc-ipq6018.c
> +++ b/drivers/clk/qcom/gcc-ipq6018.c
> @@ -4194,10 +4194,9 @@ static const struct alpha_pll_config ubi32_pll_config = {
>  	.test_ctl_hi_val = 0x4000,
>  };
>  
> +/* 1200 MHz configuration */
>  static const struct alpha_pll_config nss_crypto_pll_config = {
>  	.l = 0x32,
> -	.alpha = 0x0,
> -	.alpha_hi = 0x0,

I'd say this serves documentation purposes: zero alpha value

>  	.config_ctl_val = 0x4001055b,
>  	.main_output_mask = BIT(0),
>  	.pre_div_val = 0x0,
> @@ -4206,7 +4205,6 @@ static const struct alpha_pll_config nss_crypto_pll_config = {
>  	.post_div_mask = GENMASK(11, 8),
>  	.vco_mask = GENMASK(21, 20),
>  	.vco_val = 0x0,
> -	.alpha_en_mask = BIT(24),

This is okay

>  };
>  
>  static struct clk_hw *gcc_ipq6018_hws[] = {
> 
> -- 
> 2.47.0
> 

-- 
With best wishes
Dmitry