linux-kernel - RE: Re: [PATCH] arm64: dts: imx8mq-evk: add one regulator used to power up pcie phy

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Message-ID: <VI1PR04MB5853CB1B4E6C07C2DC3BC8D88C429@VI1PR04MB5853.eurprd04.prod.outlook.com>
Date:   Mon, 26 Apr 2021 01:28:34 +0000
From:   Richard Zhu <hongxing.zhu@....com>
To:     Shawn Guo <shawnguo@...nel.org>
CC:     "l.stach@...gutronix.de" <l.stach@...gutronix.de>,
        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>
Subject: RE:  Re: [PATCH] arm64: dts: imx8mq-evk: add one regulator used to
 power up pcie phy

> -----Original Message-----
<snipped>
> Subject: Re: [PATCH] arm64: dts: imx8mq-evk: add one regulator used
> to power up pcie phy
> On Mon, Mar 29, 2021 at 04:06:03PM +0800, Richard Zhu wrote:
> > 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>
> > Reviewed-by: Lucas Stach <l.stach@...gutronix.de>
> > ---
> >  arch/arm64/boot/dts/freescale/imx8mq-evk.dts | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/arch/arm64/boot/dts/freescale/imx8mq-evk.dts
> > b/arch/arm64/boot/dts/freescale/imx8mq-evk.dts
> > index 85b045253a0e..4d2035e3dd7c 100644
> > --- a/arch/arm64/boot/dts/freescale/imx8mq-evk.dts
> > +++ b/arch/arm64/boot/dts/freescale/imx8mq-evk.dts
> > @@ -318,6 +318,7 @@
> >                <&clk IMX8MQ_CLK_PCIE1_PHY>,
> >                <&pcie0_refclk>;
> >       clock-names = "pcie", "pcie_aux", "pcie_phy", "pcie_bus";
> > +     vph-supply = <&vgen5_reg>;
> 
> Hmm, I do not see this in the bindings doc.
[Richard Zhu] Hi Shawn:
The binding document changes are going to PCI tree by the following patch.

https://patchwork.kernel.org/project/linux-pci/patch/1617091701-6444-2-git-send-email-hongxing.zhu@nxp.com/

Best Regards
Richard Zhu

> 
> Shawn
> 
> >       status = "okay";
> >  };
> >
> > --
> > 2.17.1
> >