linux-kernel - Re: [PATCH 1/3] clk: qcom: smd-rpm: Add rate hooks for clk_smd_rpm_branch

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Message-ID: <YUFgmdhYK/p2v1LS@ripper>
Date:   Tue, 14 Sep 2021 19:55:21 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Shawn Guo <shawn.guo@...aro.org>
Cc:     Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Loic Poulain <loic.poulain@...aro.org>,
        devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] clk: qcom: smd-rpm: Add rate hooks for
 clk_smd_rpm_branch_ops

On Mon 13 Sep 19:55 PDT 2021, Shawn Guo wrote:

> On QCM2290 platform, the clock xo_board runs at 38400000, while the
> child clock bi_tcxo needs to run at 19200000.  That said,
> clk_smd_rpm_branch_ops needs the capability of setting rate. Add rate
> hooks into clk_smd_rpm_branch_ops to make it possible.
> 

Most platforms has a crystal oscillator ticking at 38.4MHz feeding the
PMIC (represented by the rpmcc and its "xo" parent) and out comes the
bi_tcxo with a fixed 19.2MHz rate.

Is there a problem with the way sdm660_bi_tcxo is defined in this
regard?

Regards,
Bjorn

> Signed-off-by: Shawn Guo <shawn.guo@...aro.org>
> ---
>  drivers/clk/qcom/clk-smd-rpm.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/clk/qcom/clk-smd-rpm.c b/drivers/clk/qcom/clk-smd-rpm.c
> index 66d7807ee38e..2380e45b6247 100644
> --- a/drivers/clk/qcom/clk-smd-rpm.c
> +++ b/drivers/clk/qcom/clk-smd-rpm.c
> @@ -416,6 +416,9 @@ static const struct clk_ops clk_smd_rpm_ops = {
>  static const struct clk_ops clk_smd_rpm_branch_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,
>  };
>  
>  DEFINE_CLK_SMD_RPM(msm8916, pcnoc_clk, pcnoc_a_clk, QCOM_SMD_RPM_BUS_CLK, 0);
> -- 
> 2.17.1
>