linux-kernel - Re: [PATCH 7/9] clk: qcom: clk-alpha-pll: Update the PLL support for cal

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Message-ID: <wbabc2pjwe2ir6pb2nd5s3hfaf6y7nd6baabjl3rdgawtsdxq3@ncedo6jio7rz>
Date: Fri, 26 Sep 2025 00:28:06 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Jingyi Wang <jingyi.wang@....qualcomm.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>, Taniya Das <quic_tdas@...cinc.com>,
        Taniya Das <taniya.das@....qualcomm.com>,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        aiqun.yu@....qualcomm.com, tingwei.zhang@....qualcomm.com,
        trilok.soni@....qualcomm.com, yijie.yang@....qualcomm.com
Subject: Re: [PATCH 7/9] clk: qcom: clk-alpha-pll: Update the PLL support for
 cal_l

On Wed, Sep 24, 2025 at 03:58:59PM -0700, Jingyi Wang wrote:
> From: Taniya Das <taniya.das@....qualcomm.com>
> 
> Recent QCOM PLLs require the CAL_L field to be programmed according to
> specific hardware recommendations, rather than using the legacy default
> value of 0x44. Hardcoding this value can lead to suboptimal or incorrect
> behavior on newer platforms.
> 
> To address this, introduce a `cal_l` field in the PLL configuration
> structure, allowing CAL_L to be set explicitly based on platform
> requirements. This improves flexibility and ensures correct PLL
> initialization across different hardware variants.
> 
> Signed-off-by: Taniya Das <taniya.das@....qualcomm.com>
> Signed-off-by: Jingyi Wang <jingyi.wang@....qualcomm.com>
> ---
>  drivers/clk/qcom/clk-alpha-pll.c | 6 +++++-
>  drivers/clk/qcom/clk-alpha-pll.h | 1 +
>  2 files changed, 6 insertions(+), 1 deletion(-)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>


-- 
With best wishes
Dmitry