linux-kernel - RE: [PATCH v2 01/14] dt-bindings: fsl: add i.MX7ULP PMC binding doc

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Message-ID: <AM0PR04MB4481C57A58B8FEC9DAC8C4A288FF0@AM0PR04MB4481.eurprd04.prod.outlook.com>
Date:   Tue, 10 Mar 2020 05:56:53 +0000
From:   Peng Fan <peng.fan@....com>
To:     Shawn Guo <shawnguo@...nel.org>
CC:     "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "sboyd@...nel.org" <sboyd@...nel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "viresh.kumar@...aro.org" <viresh.kumar@...aro.org>,
        "rjw@...ysocki.net" <rjw@...ysocki.net>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        Anson Huang <anson.huang@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Abel Vesa <abel.vesa@....com>
Subject: RE: [PATCH v2 01/14] dt-bindings: fsl: add i.MX7ULP PMC binding doc


> Subject: Re: [PATCH v2 01/14] dt-bindings: fsl: add i.MX7ULP PMC binding doc
> 
> On Wed, Feb 19, 2020 at 03:59:44PM +0800, peng.fan@....com wrote:
> > From: Peng Fan <peng.fan@....com>
> >
> > Add i.MX7ULP Power Management Controller binding doc
> >
> > Signed-off-by: Peng Fan <peng.fan@....com>
> 
> This is a new binding, and I would like get an ACK from Rob on it.

Rob,

Would you help Ack if you are fine with this patch?

> 
> > ---
> >  .../bindings/arm/freescale/imx7ulp_pmc.yaml        | 32
> ++++++++++++++++++++++
> >  1 file changed, 32 insertions(+)
> >  create mode 100644
> > Documentation/devicetree/bindings/arm/freescale/imx7ulp_pmc.yaml
> >
> > diff --git
> > a/Documentation/devicetree/bindings/arm/freescale/imx7ulp_pmc.yaml
> > b/Documentation/devicetree/bindings/arm/freescale/imx7ulp_pmc.yaml
> > new file mode 100644
> > index 000000000000..992a5ea29d39
> > --- /dev/null
> > +++
> b/Documentation/devicetree/bindings/arm/freescale/imx7ulp_pmc.yaml
> > @@ -0,0 +1,32 @@
> > +# SPDX-License-Identifier: GPL-2.0
> > +%YAML 1.2
> > +---
> > +$id:
> > +https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdevi
> >
> +cetree.org%2Fschemas%2Fbindings%2Farm%2Ffreescale%2Fimx7ulp_pmc.y
> aml%
> >
> +23&amp;data=02%7C01%7Cpeng.fan%40nxp.com%7Cc1a27bc0347845099
> 80908d7c4
> >
> +b6dbe3%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C63719416
> 196456308
> >
> +7&amp;sdata=EJausMj4W3mpgP%2BGdKpHpyTmZY4ipbxyUAurDVTKj5A%3
> D&amp;rese
> > +rved=0
> > +$schema:
> > +https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdevi
> >
> +cetree.org%2Fmeta-schemas%2Fcore.yaml%23&amp;data=02%7C01%7Cpe
> ng.fan%
> >
> +40nxp.com%7Cc1a27bc034784509980908d7c4b6dbe3%7C686ea1d3bc2b4c
> 6fa92cd9
> >
> +9c5c301635%7C0%7C0%7C637194161964563087&amp;sdata=2UJYpLt69cd
> NiA%2BGA
> > +CI%2Bdqme0BFkqx%2FLrdt1fm3TzlM%3D&amp;reserved=0
> > +
> > +title: i.MX7ULP Power Management Controller(PMC) Device Tree Bindings
> > +
> > +maintainers:
> > +  - Peng Fan <peng.fan@....com>
> > +
> > +properties:
> > +  compatible:
> > +    items:
> > +      - enum:
> > +          - fsl,imx7ulp-pmc0
> > +          - fsl,imx7ulp-pmc1
> 
> We usually do not encode number suffix in the compatible string.  Do they
> really have different programming model?

The register layout is different and some has different name/meaning.
And pmc0 is used by M4, pmc1 is used by Linux.

A brief intro about pmc0/1.
The PMC 0 has the following features:
 a high-power (HP) and a low-power (LP) Core Regulator;
 a high-power (HP) and a low-power (LP) Array Regulator;
 a high-power (HP) and a low-power (LP) 1.2V Low Voltage Detector (LVD)
monitor (in regulator input);
 a high-power (HP) 1.8V High Voltage Detector (HVD) monitor (in regulator
supply);
 a bandgap;
 a forward back bias (FBB) and a reverse back bias (RBB) regulator.
 a temperature sensor.
The PMC 1 has the following features:
 a high-power (HP) and a low-power (LP) Linear LDO regulator;
 a set of power switches;
 a high-power (HP) and a low-power (LP) Low Voltage Detector (LVD) monitor;
 a high-power (HP) 1.2V High Voltage Detector (HVD) monitor;
 configurable LVD/HVD sense point between regulator supply and regulator output;
 a forward back bias (FBB) and a reverse back bias (RBB) regulator.

Thanks,
Peng.
> 
> Shawn
> 
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +
> > +examples:
> > +  - |
> > +    pmc0: pmc0@...a1000 {
> > +        compatible = "fsl,imx7ulp-pmc0";
> > +        reg = <0x410a1000 0x1000>;
> > +    };
> > +...
> > --
> > 2.16.4
> >