From mboxrd@z Thu Jan 1 00:00:00 1970 From: Philipp Zabel Subject: Re: [PATCH 2/2] arm: dts: imx6dl: correct cpufreq volt/freq table Date: Fri, 05 Dec 2014 10:39:15 +0100 Message-ID: <1417772355.3227.3.camel@pengutronix.de> References: <1417767829-11314-1-git-send-email-b20788@freescale.com> <1417767829-11314-2-git-send-email-b20788@freescale.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1417767829-11314-2-git-send-email-b20788-KZfg59tc24xl57MIdRCFDg@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Anson Huang Cc: shawn.guo-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, kernel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: devicetree@vger.kernel.org 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 regards Philipp -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html