linux-kernel - Re: [PATCH v2 1/3] clk: qcom: branch: Extend invert logic for branch2 mem clocks

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Message-ID: <6b8d52f7-8c97-4aa1-9674-02aa13fba18c@oss.qualcomm.com>
Date: Wed, 3 Sep 2025 12:20:31 +0530
From: Taniya Das <taniya.das@....qualcomm.com>
To: Konrad Dybcio <konrad.dybcio@....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: Ajit Pandey <quic_ajipan@...cinc.com>,
        Imran Shaik <quic_imrashai@...cinc.com>,
        Jagadeesh Kona <quic_jkona@...cinc.com>, linux-arm-msm@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v2 1/3] clk: qcom: branch: Extend invert logic for branch2
 mem clocks



On 9/2/2025 5:27 PM, Konrad Dybcio wrote:
> On 8/29/25 12:15 PM, 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 | 14 +++++++++++---
>>  drivers/clk/qcom/clk-branch.h |  4 ++++
>>  2 files changed, 15 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/clk/qcom/clk-branch.c b/drivers/clk/qcom/clk-branch.c
>> index 0f10090d4ae681babbdbbb1b6c68ffe77af7a784..90da1c94b4736f65c87aec92303d511c4aa9a173 100644
>> --- a/drivers/clk/qcom/clk-branch.c
>> +++ b/drivers/clk/qcom/clk-branch.c
>> @@ -142,8 +142,12 @@ static int clk_branch2_mem_enable(struct clk_hw *hw)
>>  	u32 val;
>>  	int ret;
>>  
>> -	regmap_update_bits(branch.clkr.regmap, mem_br->mem_enable_reg,
>> -			   mem_br->mem_enable_ack_mask, mem_br->mem_enable_ack_mask);
>> +	if (mem_br->mem_enable_invert)
>> +		regmap_update_bits(branch.clkr.regmap, mem_br->mem_enable_reg,
>> +				  mem_br->mem_enable_mask, 0);
>> +	else
>> +		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() is your friend
> 

Thanks, Konrad, will use this API.

> Konrad

-- 
Thanks,
Taniya Das