linux-kernel - Re: [PATCH v1 0/4] Enable shared SE support over I2C

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Message-ID: <7130e38e-0c9f-4d34-b427-f652619e53fa@quicinc.com>
Date: Wed, 4 Sep 2024 23:38:46 +0530
From: Mukesh Kumar Savaliya <quic_msavaliy@...cinc.com>
To: Bryan O'Donoghue <bryan.odonoghue@...aro.org>, <konrad.dybcio@...aro.org>,
        <andersson@...nel.org>, <andi.shyti@...nel.org>,
        <linux-arm-msm@...r.kernel.org>, <dmaengine@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-i2c@...r.kernel.org>
CC: <quic_vdadhani@...cinc.com>
Subject: Re: [PATCH v1 0/4] Enable shared SE support over I2C



On 8/29/2024 3:40 PM, Bryan O'Donoghue wrote:
> On 29/08/2024 10:24, Mukesh Kumar Savaliya wrote:
>> This Series adds support to share QUP based I2C SE between subsystems.
>> Each subsystem should have its own GPII which interacts between SE and
>> GSI DMA HW engine.
>>
>> Subsystem must acquire Lock over the SE on GPII channel so that it
>> gets uninterrupted control till it unlocks the SE. It also makes sure
>> the commonly shared TLMM GPIOs are not touched which can impact other
>> subsystem or cause any interruption. Generally, GPIOs are being
>> unconfigured during suspend time.
>>
>> GSI DMA engine is capable to perform requested transfer operations
>> from any of the SE in a seamless way and its transparent to the
>> subsystems. Make sure to enable “qcom,shared-se” flag only while
>> enabling this feature. I2C client should add in its respective parent
>> node.
>>
>> ---
>> Mukesh Kumar Savaliya (4):
>>    dt-bindindgs: i2c: qcom,i2c-geni: Document shared flag
>>    dma: gpi: Add Lock and Unlock TRE support to access SE exclusively
>>    soc: qcom: geni-se: Export function geni_se_clks_off()
>>    i2c: i2c-qcom-geni: Enable i2c controller sharing between two
>>      subsystems
>>
>>   .../bindings/i2c/qcom,i2c-geni-qcom.yaml      |  4 ++
>>   drivers/dma/qcom/gpi.c                        | 37 ++++++++++++++++++-
>>   drivers/i2c/busses/i2c-qcom-geni.c            | 29 +++++++++++----
>>   drivers/soc/qcom/qcom-geni-se.c               |  4 +-
>>   include/linux/dma/qcom-gpi-dma.h              |  6 +++
>>   include/linux/soc/qcom/geni-se.h              |  3 ++
>>   6 files changed, 74 insertions(+), 9 deletions(-)
>>
> 
> In the cover letter please give an example of Serial Engine sharing.
> 
Sure Bryan, Noted. In next patch will update in cover letter.
> 
>