linux-kernel - Re: [PATCH v8 04/16] dt-bindings: imx6q-pcie: Add linux,pci-domain as required for iMX8MQ

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Date: Tue, 9 Jan 2024 12:24:20 -0600
From: Rob Herring <robh@...nel.org>
To: Frank Li <Frank.Li@....com>
Cc: krzysztof.kozlowski@...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, manivannan.sadhasivam@...aro.org, s.hauer@...gutronix.de, shawnguo@...nel.org
Subject: Re: [PATCH v8 04/16] dt-bindings: imx6q-pcie: Add linux,pci-domain
 as required for iMX8MQ

On Mon, Jan 08, 2024 at 06:21:33PM -0500, Frank Li wrote:
> iMX8MQ have two pci controllers. Adds "linux,pci-domain" as required
> property for iMX8MQ to indicate pci controller index.
> 
> This adjustment paves the way for eliminating the hardcoded check on the
> base register for acquiring the controller_id.
> 
> 	...
> 	if (dbi_base->start == IMX8MQ_PCIE2_BASE_ADDR)
> 		imx6_pcie->controller_id = 1;
> 	...
> 
> The controller_id is crucial and utilized for certain register bit
> positions. It must align precisely with the controller index in the SoC.
> An auto-incremented ID don't fit this case. The DTS or fuse configurations
> may deactivate specific PCI controllers.
> 
> Signed-off-by: Frank Li <Frank.Li@....com>
> ---
> 
> Notes:
>     Keep current to avoid DTB_CHECK warning. After these patch merged. Will add
>     linux,pci-domain in all dts file. So dt-binding can remove condition check
>     by soc.

Please don't. No need to make required everywhere. Besides not needed, 
it is an ABI break.

Rob