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 <[email protected]>
> ---
> 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?
> + 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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