linux-kernel - [PATCH v2 4/9] PCI: imx6: Using "linux,pci-domain" as slot ID

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Message-Id: <20231207193430.431994-5-Frank.Li@nxp.com>
Date:   Thu,  7 Dec 2023 14:34:25 -0500
From:   Frank Li <Frank.Li@....com>
To:     helgaas@...nel.org, manivannan.sadhasivam@...aro.org
Cc:     Frank.li@....com, bhelgaas@...gle.com, conor+dt@...nel.org,
        devicetree@...r.kernel.org, festevam@...il.com,
        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: [PATCH v2 4/9] PCI: imx6: Using "linux,pci-domain" as slot ID

Avoid use get slot id by compared with register physical address. If there
are more than 2 slots, compared logic will become complex.

Signed-off-by: Frank Li <Frank.Li@....com>
---

Notes:
    Change from v1 to v2
    - fix of_get_pci_domain_nr return value check logic

 drivers/pci/controller/dwc/pci-imx6.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 509d459bdc5a1..548034151ee1a 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)
@@ -1327,6 +1328,12 @@ 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 there are not "linux,pci-domain" in dts file, means only 1 controller */
+	if (imx6_pcie->controller_id < 0)
+		imx6_pcie->controller_id = 0;
+
 	switch (imx6_pcie->drvdata->variant) {
 	case IMX7D:
 		if (dbi_base->start == IMX8MQ_PCIE2_BASE_ADDR)
-- 
2.34.1