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Date: Wed, 6 Mar 2019 11:47:47 +0800 From: Chen-Yu Tsai <wens@...e.org> To: Torsten Duwe <duwe@....de> Cc: Carlo Caione <carlo@...one.org>, Olliver Schinagl <oliver@...inagl.nl>, Lee Jones <lee.jones@...aro.org>, Rob Herring <robh+dt@...nel.org>, Mark Rutland <mark.rutland@....com>, Jagan Teki <jagan@...rulasolutions.com>, Icenowy Zheng <icenowy@...c.io>, devicetree <devicetree@...r.kernel.org>, linux-kernel <linux-kernel@...r.kernel.org> Subject: Re: device tree binding for poly-phased regulators On Fri, Feb 22, 2019 at 7:21 PM Torsten Duwe <duwe@....de> wrote: > > Hi! > > Documentation/devicetree/bindings/mfd/axp20x.txt nicely describes the > capabilities of the X-powers PMICs; however, it seems polyphasing is > left to comments only. > > May I suggest to add a property "poly-phased", just to get the discussion > started? It could be a simple property in the current case for the axp803 > and axp806 ("poly-phased with you-know-which") or a phandle in the future. These PMICs are customized in a way that the outputs are poly-phased by default. They are customized to match a specific SoC, and that is about the only use for them. As such, there's really no way to test whether a poly-phase property and implementation works or not. If you get it wrong you risk frying your device. A poly-phase property in genernal would be nice, however I don't think this is the right device to start with. > BTW the axp803 datasheet is quite terse in that respect: is there one > "master" reulator whose settings are copied or does a driver have to keep > them in sync. The datasheet says, when outputs are poly-phased, only the settings of the first phase applies, i.e. the other settings are ignored, not even copied. ChenYu
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