netdev - [RFC v5 net-next 10/13] net: mdio: mscc-miim: add MFD functionality through ocelot-core

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Date:   Sat, 18 Dec 2021 13:49:51 -0800
From:   Colin Foster <colin.foster@...advantage.com>
To:     linux-gpio@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Russell King <linux@...linux.org.uk>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Andrew Lunn <andrew@...n.ch>, UNGLinuxDriver@...rochip.com,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Lee Jones <lee.jones@...aro.org>
Subject: [RFC v5 net-next 10/13] net: mdio: mscc-miim: add MFD functionality through ocelot-core

In the MFD case we need to request a regmap from the parent device instead
of using mmio. This allows for the driver to be used in either case.

Signed-off-by: Colin Foster <colin.foster@...advantage.com>
---
 drivers/net/mdio/mdio-mscc-miim.c | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/drivers/net/mdio/mdio-mscc-miim.c b/drivers/net/mdio/mdio-mscc-miim.c
index 00757e77fab0..d35cca4672b4 100644
--- a/drivers/net/mdio/mdio-mscc-miim.c
+++ b/drivers/net/mdio/mdio-mscc-miim.c
@@ -11,11 +11,13 @@
 #include <linux/iopoll.h>
 #include <linux/kernel.h>
 #include <linux/mdio/mdio-mscc-miim.h>
+#include <linux/mfd/core.h>
 #include <linux/module.h>
 #include <linux/of_mdio.h>
 #include <linux/phy.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
+#include <soc/mscc/ocelot.h>
 
 #define MSCC_MIIM_REG_STATUS		0x0
 #define		MSCC_MIIM_STATUS_STAT_PENDING	BIT(2)
@@ -230,13 +232,21 @@ static int mscc_miim_probe(struct platform_device *pdev)
 	struct mii_bus *bus;
 	int ret;
 
-	regs = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
-	if (IS_ERR(regs)) {
-		dev_err(dev, "Unable to map MIIM registers\n");
-		return PTR_ERR(regs);
-	}
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+	if (!device_is_mfd(pdev)) {
+		regs = devm_ioremap_resource(dev, res);
+		if (IS_ERR(regs)) {
+			dev_err(dev, "Unable to map MIIM registers\n");
+			return PTR_ERR(regs);
+		}
 
-	mii_regmap = devm_regmap_init_mmio(dev, regs, &mscc_miim_regmap_config);
+		mii_regmap = devm_regmap_init_mmio(dev, regs,
+						   &mscc_miim_regmap_config);
+	} else {
+		mii_regmap = ocelot_mfd_get_regmap_from_resource(dev->parent,
+								 res);
+	}
 
 	if (IS_ERR(mii_regmap)) {
 		dev_err(dev, "Unable to create MIIM regmap\n");
-- 
2.25.1