linux-kernel - Re: [PATCH v4 10/12] arm64: dts: qcom: sdm845-lg-judyln: Add lab/ibb

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Message-ID: <6030bf44-c239-497f-811d-2afc0e5aa926@oss.qualcomm.com>
Date: Tue, 2 Dec 2025 11:34:24 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Paul Sajna <sajattack@...tmarketos.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>, David Heidelberg <david@...t.cz>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, phone-devel@...r.kernel.org,
        Amir Dahan <system64fumo@...tonmail.com>,
        Christopher Brown <crispybrown@...il.com>
Subject: Re: [PATCH v4 10/12] arm64: dts: qcom: sdm845-lg-judyln: Add lab/ibb

On 12/2/25 5:21 AM, Paul Sajna wrote:
> December 1, 2025 at 12:38 PM, "Konrad Dybcio" <konrad.dybcio@....qualcomm.com mailto:konrad.dybcio@....qualcomm.com?to=%22Konrad%20Dybcio%22%20%3Ckonrad.dybcio%40oss.qualcomm.com%3E > wrote:
> 
>> Sorry for not responding earlier, you can retrieve the actual volt
>> numbers from the hardware by reading
>>
>> PMI8998_IBB_REG_BASE + REG_LABIBB_VOLTAGE = 0xdc41
>>
>> ibb_uV = 1.4 + .1 * val
>>
>> PMI8998_LAB_REG_BASE + REG_LABIBB_VOLTAGE = 0xde41
>>
>> lab_uV = 4.6 + .1 * val
>>
>> Konrad
>>
> 
> I found it in sysfs along the lines of your previous suggestion instead.
> 
> ```
> 1|judyln:/ # cat /sys/kernel/debug/regulator/c440000.qcom,spmi:qcom,pmi8998@3:qpnp-labibb-regulator-ibb_reg/voltage
> 5500000
> judyln:/ # cat /sys/kernel/debug/regulator/c440000.qcom,spmi:qcom,pmi8998@3:qpnp-labibb-regulator-lab_reg/voltage
> 5500000
> ```

That works too

Konrad