linux-kernel - RE:Re: [PATCH v3 1/3] dt-bindings: imx6q-pcie: add one regulator used to power up pcie phy

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Date:   Mon, 29 Mar 2021 01:15:12 +0000
From:   Richard Zhu <hongxing.zhu@....com>
To:     Lucas Stach <l.stach@...gutronix.de>,
        "andrew.smirnov@...il.com" <andrew.smirnov@...il.com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "kw@...ux.com" <kw@...ux.com>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "stefan@...er.ch" <stefan@...er.ch>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>
CC:     "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>
Subject: RE:Re: [PATCH v3 1/3] dt-bindings: imx6q-pcie: add one regulator used
 to power up pcie phy

> -----Original Message-----
> From: Lucas Stach <l.stach@...gutronix.de>
> Sent: Friday, March 26, 2021 5:38 PM
> To: Richard Zhu <hongxing.zhu@....com>; andrew.smirnov@...il.com;
> shawnguo@...nel.org; kw@...ux.com; bhelgaas@...gle.com;
> stefan@...er.ch; lorenzo.pieralisi@....com
> Cc: linux-pci@...r.kernel.org; dl-linux-imx <linux-imx@....com>;
> linux-arm-kernel@...ts.infradead.org; linux-kernel@...r.kernel.org;
> kernel@...gutronix.de
> Subject: Re: [PATCH v3 1/3] dt-bindings: imx6q-pcie: add one regulator
> used to power up pcie phy
> Am Donnerstag, dem 25.03.2021 um 16:44 +0800 schrieb Richard Zhu:
> > Both 1.8v and 3.3v power supplies can be used by i.MX8MQ PCIe PHY.
> > In default, the PCIE_VPH voltage is suggested to be 1.8v refer to data
> > sheet. When PCIE_VPH is supplied by 3.3v in the HW schematic design,
> > the VREG_BYPASS bits of GPR registers should be cleared from default
> > value 1b'1 to 1b'0. Thus, the internal 3v3 to 1v8 translator would be
> > turned on.
> >
> > Signed-off-by: Richard Zhu <hongxing.zhu@....com>
> > ---
> >  Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt | 3 +++
> >  1 file changed, 3 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> > b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> > index de4b2baf91e8..e6d1886144ce 100644
> > --- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> > +++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> > @@ -38,6 +38,9 @@ Optional properties:
> >    The regulator will be enabled when initializing the PCIe host and
> >    disabled either as part of the init process or when shutting down the
> >    host.
> > +- vph-supply: Should specify the regulator in charge of VPH one of
> > +the three
> > +  PCIe PHY powers. This regulator can be supplied by both 1.8v and
> > +3.3v voltage
> > +  supplies. Might be used to distinguish different HW board designs.
> 
> Please just get rid of the last sentence. All DT properties are used in one way
> or the other to distinguish different HW designs, so no need to mention this.
[Richard Zhu] Thanks, would remove the last sentence later.
> 
> Regards,
> Lucas