linux-kernel - Re: [PATCH 4/9] PCI: imx6: Using "linux,pci-domain" as slot ID

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Message-ID: <20231206163656.GA717052@bhelgaas>
Date:   Wed, 6 Dec 2023 10:36:56 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Frank Li <Frank.Li@....com>
Cc:     imx@...ts.linux.dev, Richard Zhu <hongxing.zhu@....com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        "open list:PCI DRIVER FOR IMX6" <linux-pci@...r.kernel.org>,
        "moderated list:PCI DRIVER FOR IMX6" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/9] PCI: imx6: Using "linux,pci-domain" as slot ID

In subject, maybe you mean "Use 'linux,pci-domain' as slot ID"?
"Using" is the wrong verb form here.

On Wed, Dec 06, 2023 at 10:58:58AM -0500, Frank Li wrote:
> Avoid use get slot id by compared with register physical address. If there
> are more than 2 slots, compared logic will become complex.

But this doesn't say anything about "linux,pci-domain", and I don't
see anything about a register physical address in the patch.

Maybe this commit log was meant for a different patch?  I'm confused.

> Signed-off-by: Frank Li <Frank.Li@....com>
> ---
>  drivers/pci/controller/dwc/pci-imx6.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index 62d77fabd82a..239ef439ba70 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -33,6 +33,7 @@
>  #include <linux/pm_domain.h>
>  #include <linux/pm_runtime.h>
>  
> +#include "../../pci.h"
>  #include "pcie-designware.h"
>  
>  #define IMX8MQ_GPR_PCIE_REF_USE_PAD		BIT(9)
> @@ -1333,6 +1334,11 @@ static int imx6_pcie_probe(struct platform_device *pdev)
>  					     "Failed to get PCIEPHY reset control\n");
>  	}
>  
> +	/* Using linux,pci-domain as PCI slot id */
> +	imx6_pcie->controller_id = of_get_pci_domain_nr(node);
> +	if (imx6_pcie->controller_id)
> +		imx6_pcie->controller_id = 0;

I don't understand what this is doing.  It looks the same as just:

  imx6_pcie->controller_id = 0;

Maybe this is a typo?  As written, it doesn't look like there's any
point in calling of_get_pci_domain_nr().

>  	switch (imx6_pcie->drvdata->variant) {
>  	case IMX7D:
>  		if (dbi_base->start == IMX8MQ_PCIE2_BASE_ADDR)
> -- 
> 2.34.1
>