linux-kernel - Re: [PATCH 2/4] clk: qcom: gcc: Add support for Global Clock controller found on MSM8940

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Message-ID: <8faa0c8e-6f21-4025-bbdf-d4ec18eb7628@oss.qualcomm.com>
Date: Mon, 17 Nov 2025 13:17:48 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Barnabás Czémán <barnabas.czeman@...nlining.org>,
        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>,
        Adam Skladowski <a_skl39@...tonmail.com>,
        Sireesh Kodali <sireeshkodali@...tonmail.com>
Cc: linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Lanik <daniilt971@...il.com>
Subject: Re: [PATCH 2/4] clk: qcom: gcc: Add support for Global Clock
 controller found on MSM8940

On 11/17/25 9:51 AM, Barnabás Czémán wrote:
> 
> 
> On 17 November 2025 09:03:53 CET, Taniya Das <taniya.das@....qualcomm.com> wrote:
>>
>>
>> On 11/17/2025 3:05 AM, Barnabás Czémán wrote:
>>>  
>>> +static struct clk_branch gcc_ipa_tbu_clk = {
>>> +	.halt_reg = 0x120a0,
>>> +	.halt_check = BRANCH_VOTED,
>>> +	.clkr = {
>>> +		.enable_reg = 0x4500c,
>>> +		.enable_mask = BIT(16),
>>> +		.hw.init = &(struct clk_init_data){
>>> +			.name = "gcc_ipa_tbu_clk",
>>> +			.ops = &clk_branch2_ops,
>>> +		},
>>> +	},
>>> +};
>>> +
>>
>> Is the TBU clock used on 8940 by a SMMU driver?
> As far as I know no MSM8940 is using same smmu driver and bindings like MSM8937.

On msm8939, the clock needed to be turned on for the GPU SMMU

See 5bc1cf1466f6 ("iommu/qcom: add optional 'tbu' clock for TLB invalidate")

Konrad