On Mon, Jul 09, 2018 at 11:44:20PM +0800, Icenowy Zheng wrote: > > > 于 2018年7月9日 GMT+08:00 下午11:20:54, Corentin Labbe <clabbe@xxxxxxxxxxxx> 写到: > >Hello > > > >With Moeicenowy's agreement, I have take leadership ot this patchset. > > > >There are no really changes appart renaming struct quirck to variant. > > > >Since the last serie is really old, I will answer comment here. > >The two regulator (1.2 and 2.5V) are not for the PHY since: > >- nothing in the schematic said that they are for the PHY, they seems > > only for controller > >- all other AHCI driver use 5V for the target/PHY (vs 1.2/2.5 which > > cannot be used for target) > > Target is not equal to PHY. Target means the supply > of the disk, which can be usually 5v (for 2.5" HDD) or > 12v (3.5" HDD). > > By reading Wikipedia articles about SATA and LVDS, I assume > 2.5V is for PHY and 1.2V is for internal digital logic (VDD-SYS > is commonly 1.2V on 40nm Allwinner SoCs; 2.5V VDD can be > used to efficiently deliver ~1.2V LVDS.) > > P.S. VDD-SATA and VDD25-SATA also exist on A20, and by checking > Banana Pi M1 (the original Banana Pi) schematics, VDD-SATA > is connected to common VDD-SYS (called INTVDD on the > schematics) and VDD25-SATA is connected to an always-on > fixed LDO, maybe due to the lack of power outputs on AXP209. > So we still need to add a regulator on the controller and add an optionnal "phy" regulator for AHCI port. -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
