linux-kernel - Re: [PATCH v5 04/16] dt-bindings: imx6q-pcie: Add linux,pci-domain as required for iMX8MQ

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Date: Sat, 23 Dec 2023 23:29:17 -0500
From: Frank Li <Frank.li@....com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: manivannan.sadhasivam@...aro.org, bhelgaas@...gle.com,
	conor+dt@...nel.org, devicetree@...r.kernel.org, festevam@...il.com,
	helgaas@...nel.org, hongxing.zhu@....com, imx@...ts.linux.dev,
	kernel@...gutronix.de, krzysztof.kozlowski+dt@...aro.org,
	kw@...ux.com, l.stach@...gutronix.de,
	linux-arm-kernel@...ts.infradead.org, linux-imx@....com,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	lpieralisi@...nel.org, robh@...nel.org, s.hauer@...gutronix.de,
	shawnguo@...nel.org
Subject: Re: [PATCH v5 04/16] dt-bindings: imx6q-pcie: Add linux,pci-domain
 as required for iMX8MQ

On Sat, Dec 23, 2023 at 07:40:28PM +0100, Krzysztof Kozlowski wrote:
> On 20/12/2023 22:36, Frank Li wrote:
> > iMX8MQ have two pci controllers. Adds "linux,pci-domain" as required
> > proptery for iMX8MQ to indicate pci controller index.
> 
> 
> Why it has to be required? Everything will work fine if skipped.
> Otherwise please provide reason why it must be *required*.

Next patch will use "linux,pci-domain" as PCI slot ID, instead compared
with hard code register address.

The below code will be removed.

-		if (dbi_base->start == IMX8MQ_PCIE2_BASE_ADDR)
-			imx6_pcie->controller_id = 1;


when there are more than 2 controller, this compare logic will become
complex. 

So after next patch, "linux,pci-domain" will be required.

Frank

> 
> Best regards,
> Krzysztof
>