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SubjectRe: [PATCH v1 1/2] scsi: dt-bindings: ufs: Add vcc-voltage-level for UFS
On Tue 01 Sep 01:00 CDT 2020, Bao D. Nguyen wrote:

> UFS's specifications supports a range of Vcc operating
> voltage levels. Add documentation for the UFS's Vcc voltage
> levels setting.
>
> Signed-off-by: Can Guo <cang@codeaurora.org>
> Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
> Signed-off-by: Bao D. Nguyen <nguyenb@codeaurora.org>
> ---
> Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt b/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt
> index 415ccdd..7257b32 100644
> --- a/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt
> +++ b/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt
> @@ -23,6 +23,8 @@ Optional properties:
> with "phys" attribute, provides phandle to UFS PHY node
> - vdd-hba-supply : phandle to UFS host controller supply regulator node
> - vcc-supply : phandle to VCC supply regulator node
> +- vcc-voltage-level : specifies voltage levels for VCC supply.
> + Should be specified in pairs (min, max), units uV.

What exactly are these pairs representing?

Is this supposed to be 3 pairs of (min,max) for vcc, vcc and vccq2 to be
passed into a regulator_set_voltage() for each regulator?

Or are these some sort of "operating points" for the vcc-supply?

Regards,
Bjorn

> - vccq-supply : phandle to VCCQ supply regulator node
> - vccq2-supply : phandle to VCCQ2 supply regulator node
> - vcc-supply-1p8 : For embedded UFS devices, valid VCC range is 1.7-1.95V
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>

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