linux-kernel - RE: [PATCH 1/2] ARM: dts: pfuze3000: update sw1a/vldo4 voltage range

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Date:   Mon, 19 Mar 2018 01:59:41 +0000
From:   Anson Huang <anson.huang@....com>
To:     Fabio Estevam <festevam@...il.com>
CC:     Robin Gong <yibin.gong@....com>, Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        dl-linux-imx <linux-imx@....com>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/2] ARM: dts: pfuze3000: update sw1a/vldo4 voltage range

Hi, Fabio

Anson Huang
Best Regards!


> -----Original Message-----
> From: Fabio Estevam [mailto:festevam@...il.com]
> Sent: Sunday, March 18, 2018 8:55 PM
> To: Anson Huang <anson.huang@....com>
> Cc: Robin Gong <yibin.gong@....com>; Shawn Guo <shawnguo@...nel.org>;
> Sascha Hauer <kernel@...gutronix.de>; Fabio Estevam
> <fabio.estevam@....com>; Rob Herring <robh+dt@...nel.org>; Mark Rutland
> <mark.rutland@....com>; Russell King - ARM Linux <linux@...linux.org.uk>;
> Liam Girdwood <lgirdwood@...il.com>; Mark Brown <broonie@...nel.org>;
> dl-linux-imx <linux-imx@....com>; moderated list:ARM/FREESCALE IMX / MXC
> ARM ARCHITECTURE <linux-arm-kernel@...ts.infradead.org>; open list:OPEN
> FIRMWARE AND FLATTENED DEVICE TREE BINDINGS
> <devicetree@...r.kernel.org>; linux-kernel <linux-kernel@...r.kernel.org>
> Subject: Re: [PATCH 1/2] ARM: dts: pfuze3000: update sw1a/vldo4 voltage range
> 
> On Sat, Mar 17, 2018 at 11:23 PM, Anson Huang <anson.huang@....com>
> wrote:
> 
> > I thought the max value here means the capability of regulator itself, like the
> internal
> 
> No it is not.
> 
> Please check Documentation/devicetree/bindings/regulator/regulator.txt:
> 
> "- regulator-max-microvolt: largest voltage consumers may set"
 
OK, so I should change the max value of SW1A according to board design, such
as for MX7D, it is 1.075V for max cpu-freq's voltage, set it to 1.075 in dts?

Also, according to the binding doc, do you think the anatop's vdd_arm and vdd_soc/pu's max
value also need to be adjusted to match the value define in each soc's datasheet? 

Anson.