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

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Message-ID: <bbeaa30c0c68695c194a67e1940e466c47c9e93f.camel@pengutronix.de>
Date:   Fri, 26 Mar 2021 10:37:30 +0100
From:   Lucas Stach <l.stach@...gutronix.de>
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, 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.

Regards,
Lucas