linux-kernel - Re: [PATCH V5 2/4] dt-bindings: ufs: Document bindings for SA8255P UFS Host Controller

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Message-ID: <jsatarcn3ahtj2gyc3kqjtjydlrxlx2fk4ufxylvujf4nxrvyw@x5gkaeqg34mj>
Date: Tue, 20 Jan 2026 19:01:41 +0530
From: Manivannan Sadhasivam <mani@...nel.org>
To: Ram Kumar Dwivedi <ram.dwivedi@....qualcomm.com>
Cc: 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, linux-arm-msm@...r.kernel.org, 
	linux-scsi@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Anjana Hari <anjana.hari@....qualcomm.com>
Subject: Re: [PATCH V5 2/4] dt-bindings: ufs: Document bindings for SA8255P
 UFS Host Controller

On Tue, Jan 13, 2026 at 01:30:44PM +0530, Ram Kumar Dwivedi wrote:
> 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 <anjana.hari@....qualcomm.com>
> Signed-off-by: Anjana Hari <anjana.hari@....qualcomm.com>
> Signed-off-by: Ram Kumar Dwivedi <ram.dwivedi@....qualcomm.com>

Acked-by: Manivannan Sadhasivam <mani@...nel.org>

- Mani

> ---
>  .../bindings/ufs/qcom,sa8255p-ufshc.yaml      | 56 +++++++++++++++++++
>  1 file changed, 56 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..75fae9f1eba7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/ufs/qcom,sa8255p-ufshc.yaml
> @@ -0,0 +1,56 @@
> +# 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>
> +
> +properties:
> +  compatible:
> +    const: qcom,sa8255p-ufshc
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  iommus:
> +    maxItems: 1
> +
> +  dma-coherent: true
> +
> +  power-domains:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - power-domains
> +  - iommus
> +  - dma-coherent
> +
> +allOf:
> +  - $ref: ufs-common.yaml
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> +    ufshc@...4000 {
> +        compatible = "qcom,sa8255p-ufshc";
> +        reg = <0x01d84000 0x3000>;
> +        interrupts = <GIC_SPI 265 IRQ_TYPE_LEVEL_HIGH>;
> +        lanes-per-direction = <2>;
> +
> +        iommus = <&apps_smmu 0x100 0x0>;
> +        power-domains = <&scmi3_pd 0>;
> +        dma-coherent;
> +    };
> -- 
> 2.34.1
> 

-- 
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