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

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Message-ID: <20210426020053.GE27585@dragon>
Date:   Mon, 26 Apr 2021 10:00:54 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Richard Zhu <hongxing.zhu@....com>
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

On Mon, Apr 26, 2021 at 01:28:34AM +0000, Richard Zhu wrote:
> > -----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/

Ah, okay, ping me when the series is applied to PCI tree.

Shawn