Hi, Philipp The table you listed is VDDARM_IN and VDDSOC_IN which is for external PMIC and we normally do NOT adjust them when cpufreq change, we only adjust the internel LDO output, my table is for VDDARM_CAP and VDDSOC_CAP which are in the comment column, for LDO output. For LDO enabled mode, VDDARM/SOC_CAP is the output of LDO, we pass this table to kernel opp. For LDO bypassed mode, VDDARM/SOC_IN = VDDARM/SOC_CAP. Best regards! Anson Huang -----Original Message----- From: Philipp Zabel [mailto:p.zabel@xxxxxxxxxxxxxx] Sent: 2014-12-05 5:39 PM To: Huang Yongcai-B20788 Cc: shawn.guo@xxxxxxxxxx; kernel@xxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx Subject: Re: [PATCH 2/2] arm: dts: imx6dl: correct cpufreq volt/freq table Am Freitag, den 05.12.2014, 16:23 +0800 schrieb Anson Huang: > Currently the cpufreq volt/freq table we used is for LDO enable mode, > according to latest datasheet Rev. 3, 03/2014, the volt/freq table is > as below: > > LDO enabled(min value): > 996MHz: VDDARM: 1.225V, VDDSOC: 1.150V; > 792MHz: VDDARM: 1.150V, VDDSOC: 1.150V; > 396MHz: VDDARM: 1.050V, VDDSOC: 1.150V; >From which datasheet is this? I find it unlikely that the LDO enabled values are not larger than the LDO bypassed ones. I just had a look at the "i.MXSolo/6DualLite Automotive and Infotainment Applications Processors" Datasheet (IMX6SDLAEC) Rev. 3, 03/2014 and the "i.MX 6Solo/6DualLite Applications Processors for Consumer Products" Datasheet (IMX6SDLCEC) Rev. 3, 03/2014, and they both have different values in Table 9 (Operating Ranges) for the LDO enabled case: LDO enabled(min value): 996MHz: VDDARM: 1.350V, VDDSOC: 1.275V; 792MHz: VDDARM: 1.275V, VDDSOC: 1.275V; 396MHz: VDDARM: 1.175V, VDDSOC: 1.275V; > LDO bypassed(min value): > 996MHz: VDDARM: 1.250V, VDDSOC: 1.150V; > 792MHz: VDDARM: 1.150V, VDDSOC: 1.150V; > 396MHz: VDDARM: 1.050V, VDDSOC: 1.150V; > > Adding 25mV to cover board IR drop, for LDO enabled mode of 996MHz, > VDDARM should be 1.250V, so this patch updates it. > > Signed-off-by: Anson Huang <b20788@xxxxxxxxxxxxx> regards Philipp ��.n��������+%������w��{.n����z�{��ܨ}���Ơz�j:+v�����w����ޙ��&�)ߡ�a����z�ޗ���ݢj��w�f
