[PATCH net v1] net: broadcom: fix a mistake about ioremap resource

[Dejin Zheng]

Commit d7a5502b0bb8b ("net: broadcom: convert to
devm_platform_ioremap_resource_byname()") will broke this driver.
idm_base and nicpm_base were optional, after this change, they are
mandatory. it will probe fails with -22 when the dtb doesn't have them
defined. so revert part of this commit and make idm_base and nicpm_base
as optional.

Fixes: d7a5502b0bb8bde ("net: broadcom: convert to 
devm_platform_ioremap_resource_byname()")
Reported-by: Jonathan Richardson <jonathan.richard...@broadcom.com>
Cc: Scott Branden <scott.bran...@broadcom.com>
Cc: Ray Jui <ray....@broadcom.com>
Cc: Florian Fainelli <f.faine...@gmail.com>
Cc: David S. Miller <da...@davemloft.net>
Signed-off-by: Dejin Zheng <zhengdej...@gmail.com>
---
 .../net/ethernet/broadcom/bgmac-platform.c    | 24 ++++++++++++-------
 1 file changed, 15 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bgmac-platform.c 
b/drivers/net/ethernet/broadcom/bgmac-platform.c
index a5d1a6cb9ce3..6795b6d95f54 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;
        const u8 *mac_addr;
 
        bgmac = bgmac_alloc(&pdev->dev);
@@ -206,16 +207,21 @@ 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);
-       bgmac->feature_flags &= ~BGMAC_FEAT_IDM_MASK;
+       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);
+       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;
-- 
2.25.0