On 11/25/2013 05:50 PM, Nishanth Menon wrote:
> On Mon, Nov 25, 2013 at 7:55 AM, Roger Quadros <rogerq@xxxxxx> wrote:
>> Beagle (rev. C4) and Beagle-XM (all revs) need VAUX2 1.8V supply
>> for the USB PHY.
>>
>> As the generic PHY driver can't handle more than one supply
>> at the moment, we configure this supply to be always on.
>> This will cause a very small power impact if the USB host subsystem
>> is not in use, about 76.86 micro-W + LDO power.
>
>>
>> Older Beagle boards (prior to C4) don't have VAUX2 connected anywhere,
>> so there won't be any functional impact on those boards other than
>> some additional LDO power consumption.
>>
>> Reported-by: Nishanth Menon <nm@xxxxxx>
>> Signed-off-by: Roger Quadros <rogerq@xxxxxx>
>
> Tested-by: Nishanth Menon <nm@xxxxxx>
Thanks Nishant.
>
> I might suggest though that the better alternative might be to get phy
> driver to handle multiple regulators considering that DT is supposed
> to represent the h/w topology.
Noted. I will work on this for 3.14.
cheers,
-roger
>
>> ---
>> arch/arm/boot/dts/omap3-beagle-xm.dts | 8 ++++++++
>> arch/arm/boot/dts/omap3-beagle.dts | 8 ++++++++
>> 2 files changed, 16 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/omap3-beagle-xm.dts b/arch/arm/boot/dts/omap3-beagle-xm.dts
>> index 31a632f..b39918e 100644
>> --- a/arch/arm/boot/dts/omap3-beagle-xm.dts
>> +++ b/arch/arm/boot/dts/omap3-beagle-xm.dts
>> @@ -215,3 +215,11 @@
>> &usbhsehci {
>> phys = <0 &hsusb2_phy>;
>> };
>> +
>> +&vaux2 {
>> + regulator-name = "usb_1v8";
>> + regulator-min-microvolt = <1800000>;
>> + regulator-max-microvolt = <1800000>;
>> + regulator-always-on;
>> +};
>> +
>> diff --git a/arch/arm/boot/dts/omap3-beagle.dts b/arch/arm/boot/dts/omap3-beagle.dts
>> index fa532aa..9764556 100644
>> --- a/arch/arm/boot/dts/omap3-beagle.dts
>> +++ b/arch/arm/boot/dts/omap3-beagle.dts
>> @@ -178,3 +178,11 @@
>> mode = <3>;
>> power = <50>;
>> };
>> +
>> +&vaux2 {
>> + regulator-name = "vdd_ehci";
>> + regulator-min-microvolt = <1800000>;
>> + regulator-max-microvolt = <1800000>;
>> + regulator-always-on;
>> +};
>> +
>> --
>> 1.8.3.2
>>
>>
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