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Commit b870d21d authored by Bao D. Nguyen's avatar Bao D. Nguyen
Browse files

scsi: ufs: Add document for vcc-low-voltage-sup 



UFS3.0 devices are capable of running at lower level (2.5v)
of Vcc rail. If both UFS host and device support 2.5v Vcc level,
this vcc-low-voltage-sup is used to specify the support for
this feature.

Change-Id: I598af391a4c6a04a49910b17247611af28231b74
Signed-off-by: default avatarBao D. Nguyen <nguyenb@codeaurora.org>
parent fd7457eb

Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt

+3 −0
Original line number Diff line number Diff line
@@ -25,6 +25,8 @@ Optional properties: 
- 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.

- vcc-low-voltage-sup   : If specified, treats min voltage from vcc-voltage-level as

                          low voltage level different from max voltage.

- 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
@@ -91,6 +93,7 @@ Example: 
		vdd-hba-fixed-regulator;

		vcc-supply = <&xxx_reg1>;

		vcc-supply-1p8;

		vcc-low-voltage-sup;

		vccq-supply = <&xxx_reg2>;

		vccq2-supply = <&xxx_reg3>;

		vcc-max-microamp = 500000;