Hi Tony, On 07/07/2014 11:29 AM, Tony Lindgren wrote: > * Roger Quadros <rogerq@xxxxxx> [140704 02:57]: >> 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. >> >> CC: Rajendra Nayak <rnayak@xxxxxx> >> CC: Tero Kristo <t-kristo@xxxxxx> >> Signed-off-by: Roger Quadros <rogerq@xxxxxx> > > Best that you queue this with the series: This patch doesn't have any dependency with the others and we're not even sure if this series will hit 3.16. But this 1V8 regulator _is_ required for normal operation of the SoC, whether the PHYs are in use or not. Can you please queue just this patch for SoC fixes for 3.16? Thanks. cheers, -roger > > Acked-by: Tony Lindgren <tony@xxxxxxxxxxx> > >> --- >> arch/arm/boot/dts/dra7-evm.dts | 1 + >> 1 file changed, 1 insertion(+) >> >> diff --git a/arch/arm/boot/dts/dra7-evm.dts b/arch/arm/boot/dts/dra7-evm.dts >> index 4adc280..8308954 100644 >> --- a/arch/arm/boot/dts/dra7-evm.dts >> +++ b/arch/arm/boot/dts/dra7-evm.dts >> @@ -240,6 +240,7 @@ >> regulator-name = "ldo3"; >> regulator-min-microvolt = <1800000>; >> regulator-max-microvolt = <1800000>; >> + regulator-always-on; >> regulator-boot-on; >> }; >> >> -- >> 1.8.3.2 >> -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
