linux-kernel - [PATCH net] Revert "net: ethernet: bgmac: Use devm_platform_ioremap_resource

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Date:   Wed, 16 Feb 2022 10:46:34 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     netdev@...r.kernel.org
Cc:     andrew@...n.ch, Jonas Gorski <jonas.gorski@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Rafał Miłecki <rafal@...ecki.pl>,
        bcm-kernel-feedback-list@...adcom.com (maintainer:BROADCOM IPROC GBIT
        ETHERNET DRIVER), "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Yang Yingliang <yangyingliang@...wei.com>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH net] Revert "net: ethernet: bgmac: Use devm_platform_ioremap_resource_byname"

From: Jonas Gorski <jonas.gorski@...il.com>

This reverts commit 3710e80952cf2dc48257ac9f145b117b5f74e0a5.

Since idm_base and nicpm_base are still optional resources not present
on all platforms, this breaks the driver for everything except Northstar
2 (which has both).

The same change was already reverted once with 755f5738ff98 ("net:
broadcom: fix a mistake about ioremap resource").

So let's do it again.

Fixes: 3710e80952cf ("net: ethernet: bgmac: Use devm_platform_ioremap_resource_byname")
Signed-off-by: Jonas Gorski <jonas.gorski@...il.com>
[florian: Added comments to explain the resources are optional]
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
 .../net/ethernet/broadcom/bgmac-platform.c    | 23 +++++++++++++------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bgmac-platform.c b/drivers/net/ethernet/broadcom/bgmac-platform.c
index c6412c523637..b4381cd41979 100644
--- a/drivers/net/ethernet/broadcom/bgmac-platform.c
+++ b/drivers/net/ethernet/broadcom/bgmac-platform.c
@@ -172,6 +172,7 @@ static int bgmac_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
 	struct bgmac *bgmac;
+	struct resource *regs;
 	int ret;
 
 	bgmac = bgmac_alloc(&pdev->dev);
@@ -208,15 +209,23 @@ static int bgmac_probe(struct platform_device *pdev)
 	if (IS_ERR(bgmac->plat.base))
 		return PTR_ERR(bgmac->plat.base);
 
-	bgmac->plat.idm_base = devm_platform_ioremap_resource_byname(pdev, "idm_base");
-	if (IS_ERR(bgmac->plat.idm_base))
-		return PTR_ERR(bgmac->plat.idm_base);
-	else
+	/* The idm_base resource is optional for some platforms */
+	regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "idm_base");
+	if (regs) {
+		bgmac->plat.idm_base = devm_ioremap_resource(&pdev->dev, regs);
+		if (IS_ERR(bgmac->plat.idm_base))
+			return PTR_ERR(bgmac->plat.idm_base);
 		bgmac->feature_flags &= ~BGMAC_FEAT_IDM_MASK;
+	}
 
-	bgmac->plat.nicpm_base = devm_platform_ioremap_resource_byname(pdev, "nicpm_base");
-	if (IS_ERR(bgmac->plat.nicpm_base))
-		return PTR_ERR(bgmac->plat.nicpm_base);
+	/* The nicpm_base resource is optional for some platforms */
+	regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nicpm_base");
+	if (regs) {
+		bgmac->plat.nicpm_base = devm_ioremap_resource(&pdev->dev,
+							       regs);
+		if (IS_ERR(bgmac->plat.nicpm_base))
+			return PTR_ERR(bgmac->plat.nicpm_base);
+	}
 
 	bgmac->read = platform_bgmac_read;
 	bgmac->write = platform_bgmac_write;
-- 
2.25.1