linux-kernel - Re: [PATCH V1 2/3] dt-bindings: ufs: Document bindings for SA8255P UFS Host Controller

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Message-ID: <72c817b8-0485-4769-90d3-c93a462ccef5@oss.qualcomm.com>
Date: Wed, 10 Dec 2025 21:17:35 +0530
From: Ram Kumar Dwivedi <ram.dwivedi@....qualcomm.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: mani@...nel.org, alim.akhtar@...sung.com, avri.altman@....com,
        bvanassche@....org, robh@...nel.org, krzk+dt@...nel.org,
        conor+dt@...nel.org, James.Bottomley@...senpartnership.com,
        martin.petersen@...cle.com, quic_ahari@...cinc.com,
        linux-arm-msm@...r.kernel.org, linux-scsi@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V1 2/3] dt-bindings: ufs: Document bindings for SA8255P
 UFS Host Controller



On 15-Nov-25 5:25 PM, Krzysztof Kozlowski wrote:
> On Fri, Nov 14, 2025 at 08:26:45PM +0530, Ram Kumar Dwivedi wrote:
>> From: Ram Kumar Dwivedi <quic_rdwivedi@...cinc.com>
>>
>> Document the device tree bindings for UFS host controller on
>> Qualcomm SA8255P platform which integrates firmware-managed
>> resources.
>>
>> The platform firmware implements the SCMI server and manages
>> resources such as the PHY, clocks, regulators and resets via the
>> SCMI power protocol. As a result, the OS-visible DT only describes
>> the controller’s MMIO, interrupt, IOMMU and power-domain interfaces.
>>
>> The generic "qcom,ufshc" and "jedec,ufs-2.0" compatible strings are
>> removed from the binding, since this firmware managed design won't
>> be compatible with the drivers doing full resource management.
>>
>> Co-developed-by: Anjana Hari <quic_ahari@...cinc.com>
>> Signed-off-by: Anjana Hari <quic_ahari@...cinc.com>
>> Signed-off-by: Ram Kumar Dwivedi <quic_rdwivedi@...cinc.com>
>> ---
>>  .../bindings/ufs/qcom,sa8255p-ufshc.yaml      | 63 +++++++++++++++++++
>>  1 file changed, 63 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/ufs/qcom,sa8255p-ufshc.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/ufs/qcom,sa8255p-ufshc.yaml b/Documentation/devicetree/bindings/ufs/qcom,sa8255p-ufshc.yaml
>> new file mode 100644
>> index 000000000000..3b31f6282feb
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/ufs/qcom,sa8255p-ufshc.yaml
>> @@ -0,0 +1,63 @@
>> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/ufs/qcom,sa8255p-ufshc.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Qualcomm SA8255P UFS Host Controller
>> +
>> +maintainers:
>> +  - Ram Kumar Dwivedi <ram.dwivedi@....qualcomm.com>
>> +  - Anjana Hari <quic_ahari@...cinc.com>
>> +
>> +properties:
>> +  compatible:
>> +    const: qcom,sa8255p-ufshc
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  interrupts:
>> +    maxItems: 1
>> +
>> +  iommus:
>> +    maxItems: 1
>> +
>> +  dma-coherent:
> 
> Just :true.
> 
>> +    type: boolean

Hi Krzysztof,

I have updated this in latest patchset.

Thanks,
Ram.

> 
> Best regards,
> Krzysztof
>