linux-kernel - RE: [PATCH v4 2/4] dts: arm64: imx8mq: Add dbi2 and atu reg for i.MX8MQ PCIe EP

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Message-ID:
 <AS8PR04MB8676E570AC307F540F1CAFB98C862@AS8PR04MB8676.eurprd04.prod.outlook.com>
Date: Tue, 13 Aug 2024 07:54:16 +0000
From: Hongxing Zhu <hongxing.zhu@....com>
To: Shawn Guo <shawnguo2@...h.net>
CC: "robh@...nel.org" <robh@...nel.org>, "krzk+dt@...nel.org"
	<krzk+dt@...nel.org>, "conor+dt@...nel.org" <conor+dt@...nel.org>,
	"shawnguo@...nel.org" <shawnguo@...nel.org>, "l.stach@...gutronix.de"
	<l.stach@...gutronix.de>, "devicetree@...r.kernel.org"
	<devicetree@...r.kernel.org>, "linux-pci@...r.kernel.org"
	<linux-pci@...r.kernel.org>, "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>, "imx@...ts.linux.dev" <imx@...ts.linux.dev>
Subject: RE: [PATCH v4 2/4] dts: arm64: imx8mq: Add dbi2 and atu reg for
 i.MX8MQ PCIe EP

> -----Original Message-----
> From: Shawn Guo <shawnguo2@...h.net>
> Sent: 2024年8月13日 10:51
> To: Hongxing Zhu <hongxing.zhu@....com>
> Cc: robh@...nel.org; krzk+dt@...nel.org; conor+dt@...nel.org;
> shawnguo@...nel.org; l.stach@...gutronix.de; devicetree@...r.kernel.org;
> linux-pci@...r.kernel.org; linux-arm-kernel@...ts.infradead.org;
> linux-kernel@...r.kernel.org; kernel@...gutronix.de; imx@...ts.linux.dev
> Subject: Re: [PATCH v4 2/4] dts: arm64: imx8mq: Add dbi2 and atu reg for
> i.MX8MQ PCIe EP
> 
> On Mon, Jul 29, 2024 at 09:56:43AM +0800, Richard Zhu wrote:
> > Add dbi2 and iatu reg for i.MX8MQ PCIe EP.
> >
> > For i.MX8M PCIe EP, the dbi2 and atu addresses are pre-defined in the
> > driver. This method is not good.
> >
> > In commit b7d67c6130ee ("PCI: imx6: Add iMX95 Endpoint (EP) support"),
> > Frank suggests to fetch the dbi2 and atu from DT directly. This commit
> > is preparation to do that for i.MX8MQ PCIe EP.
> >
> > These changes wouldn't break driver function. When "dbi2" and "atu"
> > properties are present, i.MX PCIe driver would fetch the according
> > base addresses from DT directly. If only two reg properties are
> > provided, i.MX PCIe driver would fall back to the old method.
> >
> > Signed-off-by: Richard Zhu <hongxing.zhu@....com>
> > Reviewed-by: Frank Li <Frank.Li@....com>
> 
> "arm64: dts: ..." for subject prefix.
Sorry, would be correct in v5.

Best Regards
Richard Zhu
> 
> Shawn