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Date: Tue, 10 Jul 2018 15:05:17 +0200 From: LABBE Corentin <clabbe@...libre.com> To: Icenowy Zheng <icenowy@...c.io> Cc: linux@...linux.org.uk, mark.rutland@....com, maxime.ripard@...e-electrons.com, robh+dt@...nel.org, tj@...nel.org, wens@...e.org, devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com Subject: Re: [PATCH v2 0/4] sun8i: r40: add AHCI 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@...libre.com> 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.
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