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

Konrad Dybcio
2025-11-17T12:17:53Z

On 11/17/25 9:51 AM, Barnabás Czémán wrote:
>
>
> On 17 November 2025 09:03:53 CET, Taniya Das <taniya.das@oss.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