2015-05-24 2:35 GMT+09:00 Anand Moon <linux.amoon@xxxxxxxxx>: > Hi Krzysztof, > > I did some debugging on the this using powerdebug utility. > Using LDO7 to control TMU seams to me correct option compared to BUCK3. > > Setting LDO7 to control TMU I observed following output on powerdebug. > I observed that the power drawn by the board on Odroid show is much > less compare to BUCK3 on the same setup. > I can see the HDMI output on Odroid-V2 display screen. > I have done some stress testing on this configuration and It worked correctly. > > Powerdebug output using LDO7 > --------------------------------------------------------------------------------------------------------------- > PowerDebug 0.7.3 Clocks Regulators Sensors Gpio > Name Status State Type Users Microvolts > Min u-volts Max u-volts > phy 0 0 > 0 0 > phy 0 0 > 0 0 > vdd_ldo1 enabled voltage 0 1000000 > 1000000 1000000 > LDO1 0 0 > 0 0 > LDO2 enabled voltage 0 1800000 > 0 0 > vdd_ldo3 enabled voltage 0 1800000 > 1800000 1800000 > LDO3 0 0 > 0 0 > LDO4 enabled voltage 0 1800000 > 0 0 > vdd_ldo5 enabled voltage 0 1800000 > 1800000 1800000 > LDO5 0 0 > 0 0 > vdd_ldo6 enabled voltage 0 1000000 > 1000000 1000000 > hdmi okay 0 0 > 0 0 > hdmi okay 0 0 > 0 0 > LDO6 0 0 > 0 0 > vdd_ldo7 enabled voltage 0 1800000 > 1800000 1800000 > hdmi okay 0 0 > 0 0 > tmu okay 0 0 > 0 0 > tmu okay 0 0 > 0 0 > tmu okay 0 0 > 0 0 > tmu okay 0 0 > 0 0 > tmu okay 0 0 > 0 0 > LDO7 0 0 > 0 0 > vdd_ldo8 enabled voltage 0 1800000 > 1800000 1800000 > LDO8 0 0 > 0 0 > vdd_ldo9 enabled voltage 0 3000000 > 3000000 3000000 > LDO9 0 0 > 0 0 > > Powerdebug output using BUCK3. > -------------------------------------------------------------------------------------------------------------------------- > PowerDebug 0.7.3 Clocks Regulators Sensors Gpio > Name Status State Type Users Microvolts > Min u-volts Max u-volts > LDO21 disabled voltage 0 1800000 > 0 0 > LDO22 disabled voltage 0 1200000 > 0 0 > LDO23 enabled voltage 0 1100000 > 0 0 > tsp_io enabled voltage 0 2800000 > 2800000 2800000 > LDO24 0 0 > 0 0 > LDO25 disabled voltage 0 1800000 > 0 0 > vdd_ldo26 enabled voltage 0 3000000 > 3000000 3000000 > LDO26 0 0 > 0 0 > LDO27 enabled voltage 0 1000000 > 0 0 > LDO28 disabled voltage 0 3300000 > 0 0 > LDO29 disabled voltage 0 1800000 > 0 0 > LDO30 disabled voltage 0 1800000 > 0 0 > LDO31 disabled voltage 0 1800000 > 0 0 > LDO32 disabled voltage 0 1800000 > 0 0 > LDO33 disabled voltage 0 1800000 > 0 0 > LDO34 disabled voltage 0 3000000 > 0 0 > LDO35 disabled voltage 0 1600000 > 0 0 > LDO36 disabled voltage 0 1800000 > 0 0 > LDO37 disabled voltage 0 1800000 > 0 0 > LDO38 disabled voltage 0 2800000 > 0 0 > vdd_mif enabled voltage 0 1100000 > 800000 1300000 > BUCK1 0 0 > 0 0 > vdd_arm enabled voltage 0 1000000 > 800000 1500000 > BUCK2 0 0 > 0 0 > vdd_int enabled voltage 0 1000000 > 800000 1400000 > tmu okay 0 0 > 0 0 > tmu okay 0 0 > 0 0 > tmu okay 0 0 > 0 0 > tmu okay 0 0 > 0 0 > tmu okay 0 0 > 0 0 > BUCK3 0 0 > 0 0 > vdd_g3d enabled voltage 0 1000000 > 800000 1400000 > BUCK4 0 0 > 0 0 > vdd_mem enabled voltage 0 1200000 > 800000 1400000 > BUCK5 0 0 > 0 0 > vdd_kfc enabled voltage 0 1025000 > 800000 1500000 > > So I would like to go with LDO7. > > Please share your thoughts. I don't understand how grepping through /sys/class/regulator helps in making this decision. I just don't get it. Can you please explain it to me? Best regards, Krzysztof -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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