On Wed, Aug 14, 2013 at 1:59 AM, Gururaja Hebbar <gururaja.hebbar@xxxxxx> wrote:
> On 8/14/2013 3:50 AM, Russ Dill wrote:
>> Changes since v1:
>> * Rebased onto new am335x PM branch
>>
>> This adds a sleep and wake sequence to set the VDD core voltage to the
>> OPP50 level, 0.950V. This saves power during suspend. The sequences are
>> specific to the Beaglebone layout and PMIC, the TPS65217. The sequences
>> are written out by the Cortex-M3.
>>
>> Signed-off-by: Russ Dill <Russ.Dill@xxxxxx>
>> ---
>> arch/arm/boot/dts/am335x-bone.dts | 25 ++++++++++++++++++++++++-
>> 1 file changed, 24 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/arm/boot/dts/am335x-bone.dts b/arch/arm/boot/dts/am335x-bone.dts
>> index 444b4ed..3f6528d 100644
>> --- a/arch/arm/boot/dts/am335x-bone.dts
>> +++ b/arch/arm/boot/dts/am335x-bone.dts
>> @@ -127,10 +127,33 @@
>> status = "okay";
>> clock-frequency = <400000>;
>>
>> + /* Set OPP50 (0.95V) for VDD core */
>> + sleep_sequence = /bits/ 8 <
>
> For user readability, can you mention the PMIC used here as a comment?
Sounds like a good modification, will do.
>> + 0x02 0x24 0x0b 0x6d /* Password unlock 1 */
>> + 0x02 0x24 0x10 0x02 /* Set DCDC3 to 0.95V */
>> + 0x02 0x24 0x0b 0x6d /* Password unlock 2 */
>> + 0x02 0x24 0x10 0x02 /* Set DCDC3 to 0.95V */
>> + 0x02 0x24 0x0b 0x6c /* Password unlock 1 */
>> + 0x02 0x24 0x11 0x86 /* Apply DCDC changes */
>> + 0x02 0x24 0x0b 0x6c /* Password unlock 2 */
>> + 0x02 0x24 0x11 0x86 /* Apply DCDC changes */
>> + >;
>> +
>> + /* Set OPP100 (1.10V) for VDD core */
>> + wake_sequence = /bits/ 8 <
>> + 0x02 0x24 0x0b 0x6d /* Password unlock 1 */
>> + 0x02 0x24 0x10 0x08 /* Set DCDC3 to 1.1V */
>> + 0x02 0x24 0x0b 0x6d /* Password unlock 2 */
>> + 0x02 0x24 0x10 0x08 /* Set DCDC3 to 1.1V */
>> + 0x02 0x24 0x0b 0x6c /* Password unlock 1 */
>> + 0x02 0x24 0x11 0x86 /* Apply DCDC changes */
>> + 0x02 0x24 0x0b 0x6c /* Password unlock 2 */
>> + 0x02 0x24 0x11 0x86 /* Apply DCDC changes */
>> + >;
>> +
>> tps: tps@24 {
>> reg = <0x24>;
>> };
>> -
>> };
>> };
>>
>>
>
>
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