linux-kernel - Re: [PATCH RFT v2 02/14] clk: qcom: smd-rpm: Add .is

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Message-ID: <20230322030218.7xjrsgt3abqft2y7@ripper>
Date:   Tue, 21 Mar 2023 20:02:18 -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>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        devicetree@...r.kernel.org, Shawn Guo <shawn.guo@...aro.org>
Subject: Re: [PATCH RFT v2 02/14] clk: qcom: smd-rpm: Add .is_enabled hook

On Wed, Mar 08, 2023 at 10:35:18PM +0100, Konrad Dybcio wrote:
> From: Shawn Guo <shawn.guo@...aro.org>
> 
> The RPM clock enabling state can be found with 'enabled' in struct
> clk_smd_rpm.  Add .is_enabled hook so that clk_summary in debugfs can
> show a correct enabling state for RPM clocks.
> 

I don't think .is_enabled should be implemented for clocks where the
actual state can't be queried.

E.g. should a clock which is is_enabled = false be unprepared during
disable_unused? It's already disabled...

Regards,
Bjorn

> Signed-off-by: Shawn Guo <shawn.guo@...aro.org>
> [Konrad: rebase]
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> ---
>  drivers/clk/qcom/clk-smd-rpm.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/clk/qcom/clk-smd-rpm.c b/drivers/clk/qcom/clk-smd-rpm.c
> index 198886c1b6c8..ecacfbc4a16c 100644
> --- a/drivers/clk/qcom/clk-smd-rpm.c
> +++ b/drivers/clk/qcom/clk-smd-rpm.c
> @@ -424,18 +424,27 @@ static int clk_smd_rpm_enable_scaling(struct qcom_smd_rpm *rpm)
>  	return 0;
>  }
>  
> +static int clk_smd_rpm_is_enabled(struct clk_hw *hw)
> +{
> +	struct clk_smd_rpm *r = to_clk_smd_rpm(hw);
> +
> +	return r->enabled;
> +}
> +
>  static const struct clk_ops clk_smd_rpm_ops = {
>  	.prepare	= clk_smd_rpm_prepare,
>  	.unprepare	= clk_smd_rpm_unprepare,
>  	.set_rate	= clk_smd_rpm_set_rate,
>  	.round_rate	= clk_smd_rpm_round_rate,
>  	.recalc_rate	= clk_smd_rpm_recalc_rate,
> +	.is_enabled	= clk_smd_rpm_is_enabled,
>  };
>  
>  static const struct clk_ops clk_smd_rpm_branch_ops = {
>  	.prepare	= clk_smd_rpm_prepare,
>  	.unprepare	= clk_smd_rpm_unprepare,
>  	.recalc_rate	= clk_smd_rpm_recalc_rate,
> +	.is_enabled	= clk_smd_rpm_is_enabled,
>  };
>  
>  DEFINE_CLK_SMD_RPM_BRANCH_A(bi_tcxo, QCOM_SMD_RPM_MISC_CLK, 0, 19200000);
> 
> -- 
> 2.39.2
>