ARM: dts: dra7-evm: Make VDDA_1V8_PHY supply always on

Message ID 1407245472-14313-1-git-send-email-rogerq@ti.com
State Accepted
Commit e120fb459693bbc1ac3eabdd65c3659d7cfbfd2a
Headers show

Commit Message

Roger Quadros Aug. 5, 2014, 1:31 p.m.
commit e120fb459693bbc1ac3eabdd65c3659d7cfbfd2a upstream.

After clarification from the hardware team it was found that
this 1.8V PHY supply can't be switched OFF when SoC is Active.

Since the PHY IPs don't contain isolation logic built in the design to
allow the power rail to be switched off, there is a very high risk
of IP reliability and additional leakage paths which can result in
additional power consumption.

The only scenario where this rail can be switched off is part of Power on
reset sequencing, but it needs to be kept always-on during operation.

This patch is required for proper functionality of USB, SATA
and PCIe on DRA7-evm.

Fixes: c56a831ca47e (ARM: dts: DRA7: Add TPS659038 PMIC nodes)
CC: Tero Kristo <t-kristo@ti.com>
CC: [3.13+] <stable@vger.kernel.org>
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
---
 arch/arm/boot/dts/dra7-evm.dts | 1 +
 1 file changed, 1 insertion(+)

Patch

diff --git a/arch/arm/boot/dts/dra7-evm.dts b/arch/arm/boot/dts/dra7-evm.dts
index 96f231a..19d6092 100644
--- a/arch/arm/boot/dts/dra7-evm.dts
+++ b/arch/arm/boot/dts/dra7-evm.dts
@@ -373,6 +373,7 @@ 
 					regulator-name = "ldo3";
 					regulator-min-microvolt = <1800000>;
 					regulator-max-microvolt = <1800000>;
+					regulator-always-on;
 					regulator-boot-on;
 				};