linux-kernel - Re: [PATCH v3 1/4] clk: qcom: branch: Extend invert logic for branch2 mem clocks

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Message-ID: <fbab492a-e279-4ab1-91ad-2b4000f7229a@oss.qualcomm.com>
Date: Fri, 24 Oct 2025 10:39:13 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Taniya Das <taniya.das@....qualcomm.com>,
        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>
Cc: linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        Ajit Pandey <ajit.pandey@....qualcomm.com>,
        Imran Shaik <imran.shaik@....qualcomm.com>,
        Jagadeesh Kona <jagadeesh.kona@....qualcomm.com>
Subject: Re: [PATCH v3 1/4] clk: qcom: branch: Extend invert logic for branch2
 mem clocks

On 10/24/25 6:24 AM, Taniya Das wrote:
> Some clock branches require inverted logic for memory gating, where
> disabling the memory involves setting a bit and enabling it involves
> clearing the same bit. This behavior differs from the standard approach
> memory branch clocks ops where enabling typically sets the bit.
> 
> Introducing the mem_enable_invert to allow conditional handling of
> these sequences of the inverted control logic for memory operations
> required on those memory clock branches.
> 
> Signed-off-by: Taniya Das <taniya.das@....qualcomm.com>
> ---
>  drivers/clk/qcom/clk-branch.c | 10 ++++++----
>  drivers/clk/qcom/clk-branch.h |  4 ++++
>  2 files changed, 10 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/clk/qcom/clk-branch.c b/drivers/clk/qcom/clk-branch.c
> index 0f10090d4ae681babbdbbb1b6c68ffe77af7a784..4094ffc53d0c91dfa9e4263134c3a996100ad078 100644
> --- a/drivers/clk/qcom/clk-branch.c
> +++ b/drivers/clk/qcom/clk-branch.c
> @@ -141,9 +141,10 @@ static int clk_branch2_mem_enable(struct clk_hw *hw)
>  	struct clk_branch branch = mem_br->branch;
>  	u32 val;
>  	int ret;
> +	bool en_val = (mem_br->mem_enable_invert ? false : true);

" = !mem_br->mem_enable_invert"
>  
> -	regmap_update_bits(branch.clkr.regmap, mem_br->mem_enable_reg,
> -			   mem_br->mem_enable_ack_mask, mem_br->mem_enable_ack_mask);
> +	regmap_assign_bits(branch.clkr.regmap, mem_br->mem_enable_reg,
> +						mem_br->mem_enable_mask, en_val);
>  
>  	ret = regmap_read_poll_timeout(branch.clkr.regmap, mem_br->mem_ack_reg,
>  				       val, val & mem_br->mem_enable_ack_mask, 0, 200);
> @@ -158,9 +159,10 @@ static int clk_branch2_mem_enable(struct clk_hw *hw)
>  static void clk_branch2_mem_disable(struct clk_hw *hw)
>  {
>  	struct clk_mem_branch *mem_br = to_clk_mem_branch(hw);
> +	bool en_val = (mem_br->mem_enable_invert ? true : false);

This value is a boolean already, you can inline it below

Konrad