From aa497613093412ee26ef4bfa4ffec8391553dfca Mon Sep 17 00:00:00 2001 From: Sujit Reddy Thumma Date: Thu, 25 Sep 2014 15:32:22 +0300 Subject: ufs: Add regulator enable support UFS devices are powered by at most three external power supplies - - VCC - The flash memory core power supply, 2.7V to 3.6V or 1.70V to 1.95V - VCCQ - The controller and I/O power supply, 1.1V to 1.3V - VCCQ2 - Secondary controller and/or I/O power supply, 1.65V to 1.95V For some devices VCCQ or VCCQ2 are optional as they can be generated using internal LDO inside the UFS device. Add DT bindings for voltage regulators that can be controlled from host driver. Signed-off-by: Sujit Reddy Thumma Signed-off-by: Dolev Raviv Signed-off-by: Christoph Hellwig --- .../devicetree/bindings/ufs/ufshcd-pltfrm.txt | 24 ++++++++++++++++++++++ 1 file changed, 24 insertions(+) (limited to 'Documentation') diff --git a/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt b/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt index 20468b2a7516..65e31173dccd 100644 --- a/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt +++ b/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt @@ -8,9 +8,33 @@ Required properties: - interrupts : - reg : +Optional properties: +- vcc-supply : phandle to VCC supply regulator node +- 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 + or 2.7-3.6V. This boolean property when set, specifies + to use low voltage range of 1.7-1.95V. Note for external + UFS cards this property is invalid and valid VCC range is + always 2.7-3.6V. +- vcc-max-microamp : specifies max. load that can be drawn from vcc supply +- vccq-max-microamp : specifies max. load that can be drawn from vccq supply +- vccq2-max-microamp : specifies max. load that can be drawn from vccq2 supply + +Note: If above properties are not defined it can be assumed that the supply +regulators are always on. + Example: ufshc@0xfc598000 { compatible = "jedec,ufs-1.1"; reg = <0xfc598000 0x800>; interrupts = <0 28 0>; + + vcc-supply = <&xxx_reg1>; + vcc-supply-1p8; + vccq-supply = <&xxx_reg2>; + vccq2-supply = <&xxx_reg3>; + vcc-max-microamp = 500000; + vccq-max-microamp = 200000; + vccq2-max-microamp = 200000; }; -- cgit v1.2.3