linux-kernel - RE: [PATCH v3 1/2] dt-binding: pci-imx6: Add external reference clock mode support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID:
 <AS8PR04MB8676FBE47C2ECE074E5B14768C7CA@AS8PR04MB8676.eurprd04.prod.outlook.com>
Date: Fri, 20 Jun 2025 08:26:58 +0000
From: Hongxing Zhu <hongxing.zhu@....com>
To: Krzysztof Kozlowski <krzk@...nel.org>
CC: Frank Li <frank.li@....com>, "l.stach@...gutronix.de"
	<l.stach@...gutronix.de>, "lpieralisi@...nel.org" <lpieralisi@...nel.org>,
	"kwilczynski@...nel.org" <kwilczynski@...nel.org>, "mani@...nel.org"
	<mani@...nel.org>, "robh@...nel.org" <robh@...nel.org>, "krzk+dt@...nel.org"
	<krzk+dt@...nel.org>, "conor+dt@...nel.org" <conor+dt@...nel.org>,
	"bhelgaas@...gle.com" <bhelgaas@...gle.com>, "shawnguo@...nel.org"
	<shawnguo@...nel.org>, "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
	"kernel@...gutronix.de" <kernel@...gutronix.de>, "festevam@...il.com"
	<festevam@...il.com>, "linux-pci@...r.kernel.org"
	<linux-pci@...r.kernel.org>, "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "devicetree@...r.kernel.org"
	<devicetree@...r.kernel.org>, "imx@...ts.linux.dev" <imx@...ts.linux.dev>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v3 1/2] dt-binding: pci-imx6: Add external reference clock
 mode support

> -----Original Message-----
> From: Krzysztof Kozlowski <krzk@...nel.org>
> Sent: 2025年6月20日 15:53
> To: Hongxing Zhu <hongxing.zhu@....com>
> Cc: Frank Li <frank.li@....com>; l.stach@...gutronix.de;
> lpieralisi@...nel.org; kwilczynski@...nel.org; mani@...nel.org;
> robh@...nel.org; krzk+dt@...nel.org; conor+dt@...nel.org;
> bhelgaas@...gle.com; shawnguo@...nel.org; s.hauer@...gutronix.de;
> kernel@...gutronix.de; festevam@...il.com; linux-pci@...r.kernel.org;
> linux-arm-kernel@...ts.infradead.org; devicetree@...r.kernel.org;
> imx@...ts.linux.dev; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH v3 1/2] dt-binding: pci-imx6: Add external reference clock
> mode support
> 
> On Fri, Jun 20, 2025 at 11:13:49AM GMT, Richard Zhu wrote:
> > On i.MX, the PCIe reference clock might come from either internal
> > system PLL or external clock source.
> > Add the external reference clock source for reference clock.
> >
> > Signed-off-by: Richard Zhu <hongxing.zhu@....com>
> > Reviewed-by: Frank Li <Frank.Li@....com>
> > ---
> >  Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml | 7 ++++++-
> >  1 file changed, 6 insertions(+), 1 deletion(-)
> >
> > diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml
> > b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml
> > index ca5f2970f217..c472a5daae6e 100644
> > --- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml
> > +++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml
> > @@ -219,7 +219,12 @@ allOf:
> >              - const: pcie_bus
> >              - const: pcie_phy
> >              - const: pcie_aux
> > -            - const: ref
> > +            - description: PCIe reference clock.
> > +              oneOf:
> > +                - description: The controller might be configured
> clocking
> > +                    coming in from either an internal system PLL or
> an
> > +                    external clock source.
> > +                  enum: [ref, gio]
> 
> Internal like within PCIe or coming from other SoC block? What does "gio"
> mean?
Internal means that the PCIe reference clock is coming from other
 internal SoC block, such as system PLL. "gio" is on behalf that the
reference clock comes form external crystal oscillator.

Best Regards
Richard Zhu
> 
> Best regards,
> Krzysztof