[PATCH v2 0/4] sun8i: r40: add AHCI
From: icenowy@aosc.io (Icenowy Zheng)
Date: 2018-07-09 15:45:32
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? 2018?7?9? GMT+08:00 ??11:20:54, Corentin Labbe [off-list ref] ??:
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.
Furthermore, the AHCI binding support only one regulator per PHY, so using the "target" regulator is out of question for registring this two non-phy regulator. I hope this answer all comments done on last version. Regards Corentin Labbe (3): ata: ahci_sunxi: add support for R40 SATA controller ARM: dts: sun8i: r40: add sata node ARM: dts: sun8i: sun8i-r40-bananapi-m2-ultra: enable AHCI Icenowy Zheng (1): dt-bindings: add binding for Allwinner R40 SATA AHCI controller .../devicetree/bindings/ata/ahci-platform.txt | 1 - .../bindings/ata/allwinner,sun4i-a10-ahci.txt | 40 +++++++ arch/arm/boot/dts/sun8i-r40-bananapi-m2-ultra.dts | 18 +++ arch/arm/boot/dts/sun8i-r40.dtsi | 9 ++ drivers/ata/ahci_sunxi.c | 124 ++++++++++++++++++++- 5 files changed, 188 insertions(+), 4 deletions(-) create mode 100644 Documentation/devicetree/bindings/ata/allwinner,sun4i-a10-ahci.txt