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

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Message-ID: <869028d628bad9e1c37c3d9ea8346ba0@mainlining.org>
Date: Mon, 17 Nov 2025 15:02:46 +0100
From: barnabas.czeman@...nlining.org
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Cc: 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>,
 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 2025-11-17 13:17, Konrad Dybcio wrote:
> 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
I have not got any qcom-iommu issues on 8940 but i think it could come 
when i try to add ipa2 driver
for the SoC until i do not know where to check it.
> 
> See 5bc1cf1466f6 ("iommu/qcom: add optional 'tbu' clock for TLB 
> invalidate")
> 
> Konrad