linux-kernel - Re: [PATCH 2/2] clk: qcom: gcc-msm8996: Use read-only RCG ops for RPM bus clocks

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Message-ID: <20230613175626.aesimqz2alcqjtok@ripper>
Date:   Tue, 13 Jun 2023 10:56:26 -0700
From:   Bjorn Andersson <andersson@...nel.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     Andy Gross <agross@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, Stephan Gerhold <stephan@...hold.net>
Subject: Re: [PATCH 2/2] clk: qcom: gcc-msm8996: Use read-only RCG ops for
 RPM bus clocks

On Mon, Jun 12, 2023 at 11:22:48AM +0200, Konrad Dybcio wrote:
> The config/periph/system NoC clocks are wholly controlled by the
> RPM firmware and Linux should never ever alter their configuration.
> 

Does Linux need to know about them?

Regards,
Bjorn

> Switch them over to read-only ops to avoid that.
> 
> Fixes: b1e010c0730a ("clk: qcom: Add MSM8996 Global Clock Control (GCC) driver")
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> ---
>  drivers/clk/qcom/gcc-msm8996.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/clk/qcom/gcc-msm8996.c b/drivers/clk/qcom/gcc-msm8996.c
> index 5e44d1bcca9e..588e3b67657a 100644
> --- a/drivers/clk/qcom/gcc-msm8996.c
> +++ b/drivers/clk/qcom/gcc-msm8996.c
> @@ -264,7 +264,7 @@ static struct clk_rcg2 system_noc_clk_src = {
>  		.name = "system_noc_clk_src",
>  		.parent_data = gcc_xo_gpll0_gpll0_early_div,
>  		.num_parents = ARRAY_SIZE(gcc_xo_gpll0_gpll0_early_div),
> -		.ops = &clk_rcg2_ops,
> +		.ops = &clk_rcg2_ro_ops,
>  	},
>  };
>  
> @@ -284,7 +284,7 @@ static struct clk_rcg2 config_noc_clk_src = {
>  		.name = "config_noc_clk_src",
>  		.parent_data = gcc_xo_gpll0,
>  		.num_parents = ARRAY_SIZE(gcc_xo_gpll0),
> -		.ops = &clk_rcg2_ops,
> +		.ops = &clk_rcg2_ro_ops,
>  	},
>  };
>  
> @@ -306,7 +306,7 @@ static struct clk_rcg2 periph_noc_clk_src = {
>  		.name = "periph_noc_clk_src",
>  		.parent_data = gcc_xo_gpll0,
>  		.num_parents = ARRAY_SIZE(gcc_xo_gpll0),
> -		.ops = &clk_rcg2_ops,
> +		.ops = &clk_rcg2_ro_ops,
>  	},
>  };
>  
> 
> -- 
> 2.41.0
>